{ "name": "US boiler and pressure vessel inspection requirements by state", "description": "State-by-state comparison of boiler and pressure vessel inspection requirements across all US states. Each record is one state with its inspection intervals by boiler type (power, low-pressure steam, hot water, unfired pressure vessel), accepted inspector qualifications (state, insurance, owner-user), residential and size/pressure exemptions, governing statute citation, and administering agency. Answers 'how often does Ohio require boiler inspections', 'which states accept insurance company inspections in lieu of state inspections', and 'are residential boilers exempt in my state'.", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/", "licence": "Facts extracted from state statutes (government works) and industry reference (National Board Synopsis, freely published). Inspection intervals and exemptions are regulatory facts, not copyrightable.", "last_verified": "2026-08-05", "stale_after": "2027-08-05", "sources": [ "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/" ], "records": [ { "state": "Alabama", "governing_body": "Alabama Department of Workforce", "statute_citation": "Alabama State Statutes, Title 25. Labor, Chapter 12. The Boiler and Pressure Vessel Safety Act , Sections 25.12.1 through 25.12.22.", "power_boiler_interval": "one annual internal and external inspection", "low_pressure_boiler_interval": "one biennial inspection with an internal inspection every four years", "pressure_vessel_interval": "one biennial inspection with an internal inspection at the discretion of the inspector", "accepted_inspectors": "State deputy inspectors; insurance company inspectors holding a Certificate of Competency issued by the Secretary of Labor", "exemptions": "Boilers and pressure vessels under federal control or under regulations of Title 49 of the Code of Federal Regulations, Parts 192 and 193; pressure vessels used for transportation and storage of compressed liquefied gases per US DOT specs; pressure vessels on vehicles under other state or federal authorities; air tanks on railroad rights-of-way; pressure vessels not exceeding 5 cubic feet/250 psig, 1-1/2 cubic feet/600 psig, or 6 inches inside diameter; pressure vessels with working pressure not exceeding 15 psig; water-containing vessels of 120 gallons or less; certain hot-water supply boilers not exceeding 200,000 BTU/hr, 210\u00b0F, 120 gallons; boilers and pressure vessels operated and maintained for electricity production; boilers and pressure vessels operated as part of a manufacturing process; boilers or pressure vessels subject to OSHA standards; public utility boilers; autoclaves for sterilization; farm agricultural boilers; heating boilers in private residences or apartment houses of fewer than six family units; pressure vessels as parts of electrical circuit breakers or transformers; remote oil/gas lease pressure vessels; LP gas storage vessels under state fire marshal; air storage tanks not exceeding 16 cubic feet/120 gallons/250 psig; all pressure vessels associated with oil, natural gas, and related operations", "id": "alabama", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/alabama/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Wiggins, Jr., Director of Inspections, Chief Inspector Alabama Department of Workforce 50 N Ripley Street Montgomery, AL 36131 Telephone — 334.956.7412 Email — edward.wiggins@workforce.alabama.gov Fax ­— 334.956.7405 EMPOWERMENT Boiler Board: Yes. (Contact above official for more information.) DATE OF LAW PASSAGE: 2000 Date rules and regulations implemented: February 2004. State statute: Alabama State Statutes, Title 25. Labor, Chapter 12. The Boiler and Pressure Vessel Safety Act , Sections 25.12.1 through 25.12.22. RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "governing_body", "state", "statute_citation" ] }, { "state": "Alaska", "governing_body": "Alaska Department of Labor and Workforce Development, Mechanical Inspection Section", "statute_citation": "Alaska Statutes Title 18, Chapter 60 Boilers and Unfired Pressure Vessels 18.60.180", "power_boiler_interval": "certificate inspection annually; external inspection while under pressure, or internal inspection as warranted", "low_pressure_boiler_interval": "certificate inspection every two years with an internal inspection every four years if construction permits", "pressure_vessel_interval": "inspected internally and externally at intervals set by the Department of Labor and Workforce Development", "accepted_inspectors": "Department inspector; insurance company inspectors (inspections accepted in lieu of department inspector); special inspector commission may be issued to insurance inspectors or owner/user inspectors holding a Certificate of Competency or commission issued by a state that has adopted the ASME Code", "exemptions": "Boilers and unfired pressure vessels under federal regulation; unfired pressure vessels meeting US DOT requirements for shipment; air tanks on vehicles under other state authorities; air tanks on railroad rights-of-way; unfired pressure vessels of 5 cubic feet or less or inside diameter not exceeding 6 inches; unfired pressure vessels designed for pressure not exceeding 15 psi when not in places of public assembly; manually-fired miniature boilers as a hobby (volume less than 5 cubic feet, grate area less than 2 square feet); antique manually-fired boilers as a hobby; automatic utility hot-water heaters used for space heating not exceeding 120 gallons/210\u00b0F/150 psig/200,000 BTU/hr with tempering valve; farm agricultural boilers; steam and hot-water heating boilers in private residences or fewer than six families; unfired pressure vessels containing only cold water for domestic supply; unfired pressure vessels containing liquefied petroleum gas; unfired pressure vessels entirely full of water/hot-water supply boilers not exceeding 200,000 BTU/hr, 210\u00b0F, 120 gallons; coil-type boilers below specified limits", "id": "alaska", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/alaska/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Alaska Statutes Title 18, Chapter 60 Boilers and Unfired Pressure Vessels 18.60.180 RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "state", "statute_citation" ] }, { "state": "Arizona", "governing_body": "Industrial Commission of Arizona, Department of Safety and Health, Boiler & Elevator Safety Sections", "statute_citation": "Arizona Revised Statutes, Title 23. Labor, Article 11. Arizona Boiler Act , Sections 471 through 488.", "power_boiler_interval": "annual internal certificate inspection and an external inspection while under operating conditions; triennial (36-month) internal inspection and annual external inspection when fully attended by qualified attendants per Arizona Boiler Rule, R20-5-408(C)", "low_pressure_boiler_interval": "certificate inspection every two years; internal inspection where construction permits", "accepted_inspectors": "Third party inspectors employed by National Board or ASME accredited companies and issued a special inspection certificate by the chief boiler inspector, accepted per A.R.S. 23-485", "exemptions": "Boilers, lined hot water heaters and pressure vessels regulated by the US government; boilers, lined hot water heaters and pressure vessels located in private residences, or apartment complexes less than six units; boilers, lined hot water heaters and pressure vessels operated on Indian reservations; lined (potable) hot-water heaters not exceeding 200,000 BTU/hr, 210\u00b0F, 120 gallons", "id": "arizona", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/arizona/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Arizona Revised Statutes, Title 23. Labor, Article 11. Arizona Boiler Act , Sections 471 through 488. RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "state", "statute_citation" ] }, { "state": "Arkansas", "governing_body": "Arkansas Department of Labor & Licensing, Boiler Inspection Division", "statute_citation": "Arkansas Code 20-23-101et seq.; and 5-64-1301 through 1303.", "power_boiler_interval": "one annual internal inspection; one annual external inspection", "low_pressure_boiler_interval": "one internal inspection every three years", "pressure_vessel_interval": "every two years", "accepted_inspectors": "Insurance company inspectors commissioned by the department (accepted in lieu of department inspector, except field inspections of anhydrous ammonia vessels); inspectors holding a National Board commission employed by insurance company, owner user organization or the State of Arkansas", "exemptions": "Air tanks of 12 gallons or less containing 150 psi or less; boilers and unfired pressure vessels under Interstate Commerce Commission inspection regulations; boilers and unfired pressure vessels for domestic purposes in private dwellings and apartment houses of eight or fewer apartments; unfired pressure vessels with MAWP of 15 psi or less; unfired pressure vessels of 5 cubic feet or less or coil-type steam generators without accumulative drum; vessels for liquefied petroleum gas storage; hot-water heaters under 200,000 BTU per hour (except in hospitals, schools, day-care centers, nursing homes); hot-water supply storage tanks with heat input less than 200,000 BTU/hr, water temperature less than 210\u00b0F, nominal water-containing capacity less than 120 gallons; pressure vessels integral to mechanical devices; vessels for transporting fluids within a system; water-containing vessels of 120 gallons or less; boilers and vessels for oil, natural gas, or casinghead gas production/distribution/storage/transmission", "id": "arkansas", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/arkansas/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers and fired pressure vessels: One annual internal inspection. One annual external inspection. Unfired pressure vessels every two years. Boilers, gas, and electric water heaters located in schools, nursing homes, day-care centers, and hospitals: Once annually. Low-pressure steam-heating boilers: One internal inspection every three years.", "verified_fields": [ "low_pressure_boiler_interval", "pressure_vessel_interval" ] }, { "state": "California", "governing_body": "Department of Industrial Relations, Division of Industrial Safety and Health", "statute_citation": "California Code of Regulations, Title 8. Chapter 4. Division of Industrial Safety, Subchapter 1. Unfired Pressure Vessel Safety , Sections 450 through 560; Subchapter 2. Boiler and Fired Pressure Vessel Safety , Sections 750 through 797.", "power_boiler_interval": "one annual internal and external inspection (Exception: boilers in turbo-electric plants furnishing steam to a single turbine inspected internally at least once each 18 months); Title 8, Section 770 allows fired boilers to go up to three years without internal inspection after application and acceptance by the Pressure Vessel Unit", "pressure_vessel_interval": "one inspection at least every three years for portable air tanks and five years for all other air tanks; LPG tanks on schedule by usage type (3\u20135 years)", "accepted_inspectors": "Inspectors holding a valid Certificate of Competency issued by the division (accepted in lieu of Pressure Vessel Unit engineer); owner/user organization inspectors whose inservice programs have been approved by the Pressure Vessel Unit", "exemptions": "Boilers and pressure vessels under federal inspection and control or exempted by the labor code; boilers on automobiles and road motor vehicles; boilers and unfired pressure vessels used in household service; air pressure tanks under US DOT, Public Utilities Commission, or Highway Patrol jurisdiction; unfired pressure vessels not subject to more than 15 psi; unfired pressure vessels with inside diameter not exceeding 6 inches; small power boilers with automatic controls not exceeding 100 sq ft heating surface, 16-inch inside diameter steam drums, 100 psi MAWP, 35-gallon water capacity, 400,000 BTU/hr input; LP gas cylinders per US DOT; air tanks of 1-1/2 cubic feet or less not exceeding 150 psi", "id": "california", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/california/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "California Code of Regulations, Title 8. Chapter 4. Division of Industrial Safety, Subchapter 1. Unfired Pressure Vessel Safety , Sections 450 through 560; Subchapter 2. Boiler and Fired Pressure Vessel Safety , Sections 750 through 797. RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "state", "statute_citation" ] }, { "state": "Chicago", "governing_body": "The City of Chicago Boiler Bureau", "statute_citation": "Municipal Code of Chicago, Title 4, Chapter 344", "power_boiler_interval": "periodic internal and external inspections", "low_pressure_boiler_interval": "periodic external inspections and internal inspections at the inspector's discretion", "accepted_inspectors": "city-employed inspectors", "id": "chicago", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/chicago/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The City of Chicago Boiler Bureau administers inspections under the Municipal Code of Chicago, Title 4, Chapter 344. Authorized inspector types: Chicago accepts only city-employed inspectors and does not recognize insurance company inspections. Inspection frequency: High-pressure boilers require periodic internal and external inspections.", "verified_fields": [ "accepted_inspectors", "governing_body", "power_boiler_interval", "state", "statute_citation" ] }, { "state": "Colorado", "governing_body": "Department of Labor and Employment, Division of Oil and Public Safety - Boiler Section", "statute_citation": "Colorado Revised Statutes, Title 9. Safety \u2014 Industrial and Commercial, Article 4. Buildings and Equipment, Boiler Inspection .", "power_boiler_interval": "certificate inspection annually; internal inspection annually (may be extended to triennially with prior approval from the Boiler Division)", "low_pressure_boiler_interval": "certificate inspection biennially; external or internal inspection", "pressure_vessel_interval": "ASME Code vessels bearing ASME Code stamping considered suitable; non-ASME Code pressure vessel must be certified by the Boiler Inspection Section", "accepted_inspectors": "Insurance company inspectors commissioned by the division (accepted in lieu of division inspector, except first certificate inspection of new or reinstalled boiler must be by division inspector); owner/user inspection organizations approved by the director", "exemptions": "Boilers owned or operated by the federal government; locomotive boilers of carriers subject to Federal Locomotive Inspection Act; boilers in private residences and apartment houses with fewer than six families; boilers in cities where city boiler inspectors and codes are comparable to state program; service and domestic-type water heaters not exceeding 200,000 BTU/hr, 120 gallons, 210\u00b0F; vessels with operating pressure less than 15 psi; vessels with inside diameter not exceeding 6 inches; water-containing vessels with design pressure not exceeding 300 psi and temperature not exceeding 210\u00b0F; hot-water supply storage tanks heated by indirect means not exceeding 200,000 BTU/hr, 210\u00b0F, 120 gallons; boilers and pressure vessels under federal control; locomotive boilers for personal hobby; any other pressure vessel exempted in scope of ASME Code Section VIII Division 1", "id": "colorado", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/colorado/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-temperature water boilers shall receive a certificate inspection annually. Such boilers where construction permits shall also receive an internal inspection annually, or when the inspector deems necessary. The internal inspection frequency may be extended to triennially with prior approval from the Boiler Division. Low-pressure heating boilers, water heaters, and direct-fired jacketed steam kettles shall receive a certificate inspection biennially. This inspection may be either external or internal.", "verified_fields": [ "power_boiler_interval" ] }, { "state": "Connecticut", "governing_body": "Department of Administrative Services, Bureau of Boilers, Office of the State Building Inspector, Division of Construction Services", "statute_citation": "Connecticut General Statutes, Chapter 540, Sections 29-231 through 29-244 .", "power_boiler_interval": "one annual internal and external inspection; one annual external inspection under operating conditions not more than six months after the internal and external inspection (power boilers with internal water treatment under qualified engineer: internal and external inspection every eighteen months, plus external inspection under operating conditions not more than nine months after)", "low_pressure_boiler_interval": "external biennially, with an internal at the discretion of the inspector", "accepted_inspectors": "Insurance company inspectors commissioned by the department (accepted in lieu of department inspector)", "exemptions": "Boilers under federal control; portable boilers used in pumping, heating, steaming, and drilling in the open field; portable boilers for agricultural purposes; steam-heating boilers, hot-water heaters, and hot-water heating boilers in private homes or apartment houses of not more than five families; hot-water heaters approved by a nationally recognized testing agency not exceeding 120 gallons/200,000 BTU per hour/160 psi/210\u00b0F (except in schools, day-care centers, hospitals, nursing or boarding homes, churches, or public buildings); antique or model boilers in nonprofit museums; public service companies as defined in Connecticut General Statutes Section 16-1", "id": "connecticut", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/connecticut/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Public service companies as defined in Connecticut General Statutes (Section 16-1). OBJECTS SUBJECT TO RULES FOR FIELD INSPECTION Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING, plus water heaters in public buildings, regardless of size or BTU rating. INSPECTIONS REQUIRED Power boilers: One annual internal and external inspection. One annual external inspection under operating conditions not more than six months after the internal and external inspection. Power boilers that operate with internal water treatment under the direct supervision of a qualified engineer: One internal and external inspection every eighteen months while not under pressure. One external inspection under operating conditions not more than nine months after the external and internal inspection. Low-Pressure Boilers Low-pressure steam boilers, hot-water heating boilers, hot-water supply boilers, and hot water heaters; an external biennially, with an internal at the discretion of the inspector.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "state" ] }, { "state": "Delaware", "governing_body": "The Delaware Department of Natural Resources and Environmental Control", "statute_citation": "Delaware Code, Title 7, Chapter 74B, Section 7401B", "power_boiler_interval": "annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections", "low_pressure_boiler_interval": "biennial external inspections", "accepted_inspectors": "commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies", "id": "delaware", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/delaware/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Delaware Department of Natural Resources and Environmental Control administers the Boiler Safety Program under Delaware Code, Title 7, Chapter 74B, Section 7401B. Authorized inspector types: Delaware accepts commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections. Low-pressure boilers require biennial external inspections.", "verified_fields": [ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "biennial or every four years as determined by the inspector", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, miniature boilers, and high-pressure, high-temperature water boilers: Annual internal inspection; Annual external inspection while under pressure. The external (inservice) inspection should be done within six months of the internal inspection. Low-pressure steam heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial external inspection. Unless exempt from Field Inspection. Pressure vessels: biennial or every four years as determined by the inspector. Unless exempt from Field Inspection.", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Boilers or pressure vessels subject to federal inspection and control; pressure vessels used for transport or storage of compressed gases and liquids under US DOT control (including CO2 Dewars); air tanks on vehicles under other state agency authority; air tanks on railroad rights-of-way; unfired pressure vessels not exceeding 5 cu ft/250 psig or 3 cu ft/350 psig or 1-1/2 cu ft/600 psig or 6 inches inside diameter; unfired pressure vessels with operating pressure not exceeding 15 psig; water-containing vessels of 120 gallons or less; water filters or softeners at ambient temperature not exceeding 300 psig; pressure vessels under state fire marshal control; high pressure breathing air cylinders used by emergency response organizations (maintained per manufacturer and NFPA standards); water heaters not exceeding 200,000 BTU/hr (or 58,600 watts), 210\u00b0F, 120 gallons; coil-type hot-water boilers without steam space under specified limits; heating boilers and pressure vessels in buildings solely used for residential purposes with not more than six family units", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, miniature boilers, and high-pressure, high-temperature water boilers: Annual internal inspection; Annual external inspection while under pressure. The external (inservice) inspection should be done within six months of the internal inspection. Low-pressure steam heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial external inspection. Unless exempt from Field Inspection. Pressure vessels: biennial or every four years as determined by the inspector. Unless exempt from Field Inspection.", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "The Delaware Department of Natural Resources and Environmental Control", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Delaware Department of Natural Resources and Environmental Control administers the Boiler Safety Program under Delaware Code, Title 7, Chapter 74B, Section 7401B. Authorized inspector types: Delaware accepts commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections. Low-pressure boilers require biennial external inspections.", "as_of": "2026-08-05" }, { "value": "Department of Natural Resources and Environmental Control, DNREC, Boiler Safety", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, miniature boilers, and high-pressure, high-temperature water boilers: Annual internal inspection; Annual external inspection while under pressure. The external (inservice) inspection should be done within six months of the internal inspection. Low-pressure steam heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial external inspection. Unless exempt from Field Inspection. Pressure vessels: biennial or every four years as determined by the inspector. Unless exempt from Field Inspection.", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Delaware Code, Title 7, Chapter 74B, Section 7401B", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Delaware Department of Natural Resources and Environmental Control administers the Boiler Safety Program under Delaware Code, Title 7, Chapter 74B, Section 7401B. Authorized inspector types: Delaware accepts commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections. Low-pressure boilers require biennial external inspections.", "as_of": "2026-08-05" }, { "value": "Delaware Code, Title 7 Conservation Chapter 74B. Department of Natural Resources and Environmental Control, Section 7401B Boiler Safety Program.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, miniature boilers, and high-pressure, high-temperature water boilers: Annual internal inspection; Annual external inspection while under pressure. The external (inservice) inspection should be done within six months of the internal inspection. Low-pressure steam heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial external inspection. Unless exempt from Field Inspection. Pressure vessels: biennial or every four years as determined by the inspector. Unless exempt from Field Inspection.", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Delaware Department of Natural Resources and Environmental Control administers the Boiler Safety Program under Delaware Code, Title 7, Chapter 74B, Section 7401B. Authorized inspector types: Delaware accepts commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections. Low-pressure boilers require biennial external inspections.", "as_of": "2026-08-05" }, { "value": "Annual internal inspection; Annual external inspection while under pressure (external inspection should be done within six months of the internal inspection)", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, miniature boilers, and high-pressure, high-temperature water boilers: Annual internal inspection; Annual external inspection while under pressure. The external (inservice) inspection should be done within six months of the internal inspection. Low-pressure steam heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial external inspection. Unless exempt from Field Inspection. Pressure vessels: biennial or every four years as determined by the inspector. Unless exempt from Field Inspection.", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "biennial external inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Delaware Department of Natural Resources and Environmental Control administers the Boiler Safety Program under Delaware Code, Title 7, Chapter 74B, Section 7401B. Authorized inspector types: Delaware accepts commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections. Low-pressure boilers require biennial external inspections.", "as_of": "2026-08-05" }, { "value": "biennial external inspection", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, miniature boilers, and high-pressure, high-temperature water boilers: Annual internal inspection; Annual external inspection while under pressure. The external (inservice) inspection should be done within six months of the internal inspection. Low-pressure steam heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial external inspection. Unless exempt from Field Inspection. Pressure vessels: biennial or every four years as determined by the inspector. Unless exempt from Field Inspection.", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Delaware Department of Natural Resources and Environmental Control administers the Boiler Safety Program under Delaware Code, Title 7, Chapter 74B, Section 7401B. Authorized inspector types: Delaware accepts commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections. Low-pressure boilers require biennial external inspections.", "as_of": "2026-08-05" }, { "value": "Insurance company inspectors or Non-traditional Inspection Agency accredited by National Board-369 and approved by The State of Delaware, commissioned by the program (accepted in lieu of program inspector)", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, miniature boilers, and high-pressure, high-temperature water boilers: Annual internal inspection; Annual external inspection while under pressure. The external (inservice) inspection should be done within six months of the internal inspection. Low-pressure steam heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial external inspection. Unless exempt from Field Inspection. Pressure vessels: biennial or every four years as determined by the inspector. Unless exempt from Field Inspection.", "as_of": "2026-08-05" } ] } ] }, { "state": "Florida", "governing_body": "Bureau of Fire Prevention, Boiler Safety Section, Division of the State Fire Marshal", "statute_citation": "Florida Statutes, Title 33. Regulations of Trade, Commerce, Investments and Solicitations, Chapter 554. Boiler Safety , Sections 101.1 through 115.0.", "power_boiler_interval": "certificate inspection annually; external inspection while under pressure; internal inspection if the construction so permits", "low_pressure_boiler_interval": "certificate inspection biennially; internal inspection if the construction so permits", "accepted_inspectors": "Insurance companies required to do inservice inspections of all insured boilers in areas of public assembly; upon filing report of satisfactory inspection, boiler exempt from inspection by the Boiler Safety Program", "exemptions": "Boilers and lined hot-water heaters under the control of the federal government; HLW hot-water supply boilers or lined storage water heaters directly fired with oil, gas, electricity, or solar energy not exceeding 400,000 BTU per hour, 210\u00b0F, 120 gallons", "id": "florida", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/florida/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-temperature water boilers: Certificate inspection annually; External inspection while under pressure; Internal inspection if the construction so permits. Low-pressure steam or vapor heating boilers: Certificate inspection biennially; Internal inspection if the construction so permits. Hot-water heating and hot-water supply boilers: Certificate inspection biennially; Internal inspection every four years if the construction so permits.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval" ] }, { "state": "Georgia", "governing_body": "Office of Insurance and Safety Fire Commissioner", "statute_citation": "Official Code of Georgia Annotated, Title 25. Labor, Chapter 15 Article 2. Regulations of Boilers and Pressure Vessel Safety Act , Chapter 120-3-26. Georgia Boiler and Pressure Vessel Rules.", "power_boiler_interval": "certificate inspection annually, internal inspection where construction permits, plus external inspection while under operating pressure", "low_pressure_boiler_interval": "certificate inspection biennially with an internal inspection quadrennially where construction permits", "pressure_vessel_interval": "triennial certificate inspection (if subject to internal corrosion); all others at intervals set by the board with at least a quadrennial certificate inspection", "accepted_inspectors": "Insurance company inspectors commissioned by the department (accepted in lieu of department inspector); owner/user inspection organizations approved by the chief safety engineer", "exemptions": "Boilers and pressure vessels under federal control; US DOT pressure vessels for transportation and storage of compressed or liquefied gases; unfired pressure vessels on vehicles under other state or federal agencies; air tanks on railroad rights-of-way; unfired pressure vessels not exceeding 5 cu ft/250 psig or 1-1/2 cu ft/600 psig or 6 inches inside diameter; unfired pressure vessels with working pressure not exceeding 15 psig; vessels with water/indirect heat not exceeding 200,000 BTU/hr, 210\u00b0F, 120 gallons; boilers and pressure vessels operated and maintained by public utility; farm agricultural boilers; heating boilers or pressure vessels in private residences or apartment houses of fewer than six family units; pressure vessels as external parts of electrical circuit breakers or transformers; remote oil/gas production lease pressure vessels; LP gas storage vessels under state fire marshal; air storage tanks not exceeding 16 cubic feet/120 gallons/250 psig", "id": "georgia", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/georgia/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "King, Commissioner William \"Butch\" Lynch Jr., Chief Inspector Office of Insurance and Safety Fire Commissioner 2 Martin Luther King Jr. Drive West Tower, Suite 920 Atlanta , Georgia 30334 Telephone ­— 404.656.2064 Email — blynch@oci.ga.gov Firemarshal@oci.ga.gov Fax — 404.679.5818 EMPOWERMENT Director of Safety Engineering Division empowered to make, alter, and amend rules and regulations. Boiler Board: Yes. (Contact above official for more information.) DATE OF LAW PASSAGE: 1969 Date of latest amendment to law: July 1993. Date rules and regulations implemented: 1986. Date of latest amendment to rules and regulations: January 01, 2022. State statute: Official Code of Georgia Annotated, Title 25. Labor, Chapter 15 Article 2. Regulations of Boilers and Pressure Vessel Safety Act , Chapter 120-3-26. Georgia Boiler and Pressure Vessel Rules. RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "governing_body", "state", "statute_citation" ] }, { "state": "Hawaii", "governing_body": "Hawaii Department of Labor and Industrial Relations, Division of Occupational Safety and Health, Boiler and Elevator Inspection Branch", "statute_citation": "Hawaii Revised Statutes, Chapter 397 Boiler and Elevator Safety Law . Hawaii Administrative Rules: Part 10, Boilers and Pressure Vessels.", "power_boiler_interval": "annual internal or permit inspection; external inspection at approximately six-months after each internal (biennial internal inspections permitted for power boilers with continuous internal water treatment under qualified supervision upon approval of the director)", "low_pressure_boiler_interval": "biennial external inspection and/or an internal inspection where construction permits (large steam heating boilers require annual internal inspection, and external inspection at approximately six-months after each internal)", "pressure_vessel_interval": "biennial external inspection and/or internal inspection where construction permits", "accepted_inspectors": "Insurance companies required to inspect all insured objects; inspection reports submitted within thirty days", "exemptions": "Boilers and pressure vessels under federal inspection and control; unfired pressure vessels meeting US DOT requirements for transporting liquids or gases under pressure; containers for storage of liquefied compressed flammable gases under other agencies; unfired pressure vessels with nominal water-containing capacity of 120 gallons or less; hot-water supply boilers, hot-water heating boilers, and potable water heaters directly fired not exceeding 200,000 BTU/hr, 210\u00b0F, 120 gallons, 160 psi; unfired pressure vessels designed for pressure not exceeding 15 psig and 5 cubic feet in volume; pressure vessels not exceeding 5 cu ft/250 psi or 3 cu ft/350 psi or 1-1/2 cu ft/600 psig; unfired pressure vessels containing water and filtering material for irrigation; unfired pressure vessels for cold water storage; fired or self-contained sterilizers/steam generators/jacketed kettles/steam cookers not exceeding 3 kilowatts and 1-1/2 cubic feet; boilers in single family dwellings or fewer than six living units; unfired pressure vessels and piping containing LPG, LNG, refrigeration vessels, and liquid CO2 pressure vessels", "id": "hawaii", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/hawaii/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Hawaii Revised Statutes, Chapter 397 Boiler and Elevator Safety Law . Hawaii Administrative Rules: Part 10, Boilers and Pressure Vessels. RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "state", "statute_citation" ] }, { "state": "Idaho", "governing_body": "Idaho Division of Occupational and Professional Licenses, Industrial Safety Section", "accepted_inspectors": "Insurance company (contact insurance company for regular inspections)", "id": "idaho", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/idaho/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "The Idaho Legislature repealed the Boiler and Pressure Vessel Rules effective March 29, 2010. Contact your insurance company for regular inspections in order to maintain the safety of your workplace.", "verified_fields": [ "state" ] }, { "state": "Illinois", "governing_body": "The Illinois Office of the State Fire Marshal", "statute_citation": "Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act", "power_boiler_interval": "annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure", "low_pressure_boiler_interval": "biennial inspections", "accepted_inspectors": "division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors", "id": "illinois", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/illinois/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Illinois Office of the State Fire Marshal oversees boiler safety through its Division of Boiler and Pressure Vessel Safety under Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act. Authorized inspector types: Illinois accepts division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure. Low-pressure boilers require biennial inspections.", "verified_fields": [ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "one triennial certificate inspection (external); internal inspection at the discretion of the inspector where construction permits", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Boilers and pressure vessels under federal control (except those in cities over 500,000 inhabitants); pressure vessels on vehicles under other state authorities; pressure vessels on railroad rights-of-way; pressure vessels for transportation and storage of compressed or liquefied gases per US DOT; boilers and pressure vessels on mine property under Illinois Department of Mines and Minerals; farm agricultural boilers; steam boilers of miniature model locomotives/boats/tractors/stationary engines as a hobby (inside diameter not exceeding 12 inches, grate area not exceeding 1-1/2 square feet); pressure vessels under Illinois Fertilizer Act of 1961; LP gas pressure vessels under Liquefied Petroleum Gas Regulation (except industrial process); steam boilers up to 15 psig/200,000 BTU/hr for heating; hot-water heating boilers up to 30 psig/200,000 BTU/hr; boilers and pressure vessels in private residences or multifamily buildings with fewer than six dwelling units meeting specified category limits; steam boilers of railroad locomotives and traction engines built prior to 1955 in permanent museum collections", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "The Illinois Office of the State Fire Marshal", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Illinois Office of the State Fire Marshal oversees boiler safety through its Division of Boiler and Pressure Vessel Safety under Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act. Authorized inspector types: Illinois accepts division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure. Low-pressure boilers require biennial inspections.", "as_of": "2026-08-05" }, { "value": "Office of State Fire Marshal, Division of Boiler and Pressure Vessel Safety", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Illinois Office of the State Fire Marshal oversees boiler safety through its Division of Boiler and Pressure Vessel Safety under Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act. Authorized inspector types: Illinois accepts division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure. Low-pressure boilers require biennial inspections.", "as_of": "2026-08-05" }, { "value": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Illinois Office of the State Fire Marshal oversees boiler safety through its Division of Boiler and Pressure Vessel Safety under Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act. Authorized inspector types: Illinois accepts division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure. Low-pressure boilers require biennial inspections.", "as_of": "2026-08-05" }, { "value": "inspected annually both internally & externally while not under pressure; inspected annually externally while under pressure", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "biennial inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Illinois Office of the State Fire Marshal oversees boiler safety through its Division of Boiler and Pressure Vessel Safety under Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act. Authorized inspector types: Illinois accepts division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure. Low-pressure boilers require biennial inspections.", "as_of": "2026-08-05" }, { "value": "inspected biennially as required by the rules and regulations of the Board", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Illinois Office of the State Fire Marshal oversees boiler safety through its Division of Boiler and Pressure Vessel Safety under Illinois Compiled Statutes, Chapter 430, Subchapter 75, Boiler and Pressure Vessel Safety Act. Authorized inspector types: Illinois accepts division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure. Low-pressure boilers require biennial inspections.", "as_of": "2026-08-05" }, { "value": "Insurance company inspectors commissioned by the division (accepted in lieu of division inspector for insured boilers and pressure vessels; division inspector must do first/initial inspection); owner/user inspectors commissioned by the division (accepted in lieu of division inspector for self-insured boilers and pressure vessels)", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] } ] }, { "state": "Indiana", "governing_body": "Department of Homeland Security's Division of Fire and Building Safety", "statute_citation": "Indiana Administrative Code, Title 680", "power_boiler_interval": "annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible", "low_pressure_boiler_interval": "biennial certificate inspections conducted externally and internally, where construction permits", "accepted_inspectors": "State-employed inspectors conduct all first inspections. For ongoing inspections, commissioned insurance inspectors when vessels are insured and commissioned owner inspection agency inspectors", "id": "indiana", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/indiana/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Homeland Security’s Division of Fire and Building Safety oversees boiler inspections under Indiana Administrative Code, Title 680. Authorized inspector types: State-employed inspectors conduct all first inspections. For ongoing inspections, Indiana requires commissioned insurance inspectors when vessels are insured and accepts commissioned owner inspection agency inspectors. Inspection frequency: High-pressure boilers require annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible. Low-pressure boilers require biennial certificate inspections conducted externally and internally, where construction permits.", "verified_fields": [ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "certificate inspection intervals not to exceed maximum periods per Indiana rules, National Board Inspection Code, or API-510 (not to exceed five years; where systematic corrosion data not available, maximum three years)", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal and external certificate inspection; One annual external inspection while under pressure, if possible. With specific approval of the Boiler and Pressure Vessel Rules Board and the inspection agency, power boilers exceeding 300,000 pounds per hour steaming capacity may have inspection periods extended to a maximum of two years. Low-pressure heating boilers, hot-water heating and hot-water supply boilers: One biennial certificate inspection externally and, where construction permits, internally. Pressure vessels and steam-generating equipment which is an integral part of a continuous processing unit: Certificate inspection intervals shall not exceed the maximum periods between inspections determined in accordance with the provisions of Indiana rules, the National Board Inspection Code , or API-510 as applicable, except that:", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Domestic water heaters of size and heat input not exceeding that specified by the board; pressure vessels entirely full of water or less hazardous liquid at temperature not exceeding 180\u00b0F; boilers and unfired pressure vessels under federal regulation; unfired pressure vessels meeting US DOT requirements; air tanks on vehicles under other state authorities; air tanks on railroad rights-of-way; certain pressure vessels installed before/after July 1, 1971 based on volume and pressure limits; unfired pressure vessels protected by pressure-relieving devices at 15 psig or less; LP gas pressure vessels under Fire Prevention & Building Safety Commission; surgical sterilizers, coffee urns, steam-jacketed food cookers not exceeding board-specified size; commercial toy and miniature model boilers as hobby not exceeding board-specified size; anhydrous ammonia vessels (transportation/distribution storage as liquid fertilizer) under separate state regulations; nuclear vessels for nuclear waste collection/disposal not pressurized above atmospheric; standard and miniature traction engine boilers for exhibition; locomotive boilers on tourist attraction railways; farm agricultural boilers; certain residential boilers up to 215,000 BTU/hr output not in places of public assembly; domestic supply water-containing pressure vessels in owner-occupied or fewer than seven apartment residences; pressure vessels integral to electrical circuit breakers", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal and external certificate inspection; One annual external inspection while under pressure, if possible. With specific approval of the Boiler and Pressure Vessel Rules Board and the inspection agency, power boilers exceeding 300,000 pounds per hour steaming capacity may have inspection periods extended to a maximum of two years. Low-pressure heating boilers, hot-water heating and hot-water supply boilers: One biennial certificate inspection externally and, where construction permits, internally. Pressure vessels and steam-generating equipment which is an integral part of a continuous processing unit: Certificate inspection intervals shall not exceed the maximum periods between inspections determined in accordance with the provisions of Indiana rules, the National Board Inspection Code , or API-510 as applicable, except that:", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Department of Homeland Security's Division of Fire and Building Safety", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Homeland Security’s Division of Fire and Building Safety oversees boiler inspections under Indiana Administrative Code, Title 680. Authorized inspector types: State-employed inspectors conduct all first inspections. For ongoing inspections, Indiana requires commissioned insurance inspectors when vessels are insured and accepts commissioned owner inspection agency inspectors. Inspection frequency: High-pressure boilers require annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible. Low-pressure boilers require biennial certificate inspections conducted externally and internally, where construction permits.", "as_of": "2026-08-05" }, { "value": "Department of Homeland Security, Division of Fire and Building Safety, Boiler and Pressure Vessel Safety", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal and external certificate inspection; One annual external inspection while under pressure, if possible. With specific approval of the Boiler and Pressure Vessel Rules Board and the inspection agency, power boilers exceeding 300,000 pounds per hour steaming capacity may have inspection periods extended to a maximum of two years. Low-pressure heating boilers, hot-water heating and hot-water supply boilers: One biennial certificate inspection externally and, where construction permits, internally. Pressure vessels and steam-generating equipment which is an integral part of a continuous processing unit: Certificate inspection intervals shall not exceed the maximum periods between inspections determined in accordance with the provisions of Indiana rules, the National Board Inspection Code , or API-510 as applicable, except that:", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Indiana Administrative Code, Title 680", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Homeland Security’s Division of Fire and Building Safety oversees boiler inspections under Indiana Administrative Code, Title 680. Authorized inspector types: State-employed inspectors conduct all first inspections. For ongoing inspections, Indiana requires commissioned insurance inspectors when vessels are insured and accepts commissioned owner inspection agency inspectors. Inspection frequency: High-pressure boilers require annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible. Low-pressure boilers require biennial certificate inspections conducted externally and internally, where construction permits.", "as_of": "2026-08-05" }, { "value": "Indiana Administrative Code, Title 680. Boiler and Pressure Vessel Rules Board .", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal and external certificate inspection; One annual external inspection while under pressure, if possible. With specific approval of the Boiler and Pressure Vessel Rules Board and the inspection agency, power boilers exceeding 300,000 pounds per hour steaming capacity may have inspection periods extended to a maximum of two years. Low-pressure heating boilers, hot-water heating and hot-water supply boilers: One biennial certificate inspection externally and, where construction permits, internally. Pressure vessels and steam-generating equipment which is an integral part of a continuous processing unit: Certificate inspection intervals shall not exceed the maximum periods between inspections determined in accordance with the provisions of Indiana rules, the National Board Inspection Code , or API-510 as applicable, except that:", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Homeland Security’s Division of Fire and Building Safety oversees boiler inspections under Indiana Administrative Code, Title 680. Authorized inspector types: State-employed inspectors conduct all first inspections. For ongoing inspections, Indiana requires commissioned insurance inspectors when vessels are insured and accepts commissioned owner inspection agency inspectors. Inspection frequency: High-pressure boilers require annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible. Low-pressure boilers require biennial certificate inspections conducted externally and internally, where construction permits.", "as_of": "2026-08-05" }, { "value": "one annual internal and external certificate inspection; one annual external inspection while under pressure, if possible", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal and external certificate inspection; One annual external inspection while under pressure, if possible. With specific approval of the Boiler and Pressure Vessel Rules Board and the inspection agency, power boilers exceeding 300,000 pounds per hour steaming capacity may have inspection periods extended to a maximum of two years. Low-pressure heating boilers, hot-water heating and hot-water supply boilers: One biennial certificate inspection externally and, where construction permits, internally. Pressure vessels and steam-generating equipment which is an integral part of a continuous processing unit: Certificate inspection intervals shall not exceed the maximum periods between inspections determined in accordance with the provisions of Indiana rules, the National Board Inspection Code , or API-510 as applicable, except that:", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "biennial certificate inspections conducted externally and internally, where construction permits", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Homeland Security’s Division of Fire and Building Safety oversees boiler inspections under Indiana Administrative Code, Title 680. Authorized inspector types: State-employed inspectors conduct all first inspections. For ongoing inspections, Indiana requires commissioned insurance inspectors when vessels are insured and accepts commissioned owner inspection agency inspectors. Inspection frequency: High-pressure boilers require annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible. Low-pressure boilers require biennial certificate inspections conducted externally and internally, where construction permits.", "as_of": "2026-08-05" }, { "value": "one biennial certificate inspection externally and, where construction permits, internally", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal and external certificate inspection; One annual external inspection while under pressure, if possible. With specific approval of the Boiler and Pressure Vessel Rules Board and the inspection agency, power boilers exceeding 300,000 pounds per hour steaming capacity may have inspection periods extended to a maximum of two years. Low-pressure heating boilers, hot-water heating and hot-water supply boilers: One biennial certificate inspection externally and, where construction permits, internally. Pressure vessels and steam-generating equipment which is an integral part of a continuous processing unit: Certificate inspection intervals shall not exceed the maximum periods between inspections determined in accordance with the provisions of Indiana rules, the National Board Inspection Code , or API-510 as applicable, except that:", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "State-employed inspectors conduct all first inspections. For ongoing inspections, commissioned insurance inspectors when vessels are insured and commissioned owner inspection agency inspectors", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Homeland Security’s Division of Fire and Building Safety oversees boiler inspections under Indiana Administrative Code, Title 680. Authorized inspector types: State-employed inspectors conduct all first inspections. For ongoing inspections, Indiana requires commissioned insurance inspectors when vessels are insured and accepts commissioned owner inspection agency inspectors. Inspection frequency: High-pressure boilers require annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible. Low-pressure boilers require biennial certificate inspections conducted externally and internally, where construction permits.", "as_of": "2026-08-05" }, { "value": "Insurance company inspectors commissioned by department (required in lieu of department inspector when vessel is insured); owner/user inspection agency inspectors commissioned by the department; state-employed inspectors make all first (installation approval) inspections", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal and external certificate inspection; One annual external inspection while under pressure, if possible. With specific approval of the Boiler and Pressure Vessel Rules Board and the inspection agency, power boilers exceeding 300,000 pounds per hour steaming capacity may have inspection periods extended to a maximum of two years. Low-pressure heating boilers, hot-water heating and hot-water supply boilers: One biennial certificate inspection externally and, where construction permits, internally. Pressure vessels and steam-generating equipment which is an integral part of a continuous processing unit: Certificate inspection intervals shall not exceed the maximum periods between inspections determined in accordance with the provisions of Indiana rules, the National Board Inspection Code , or API-510 as applicable, except that:", "as_of": "2026-08-05" } ] } ] }, { "state": "Iowa", "governing_body": "Department of Inspections, Appeals, & Licensing, Boilers & Pressure Vessel Inspection Bureau", "statute_citation": "Iowa Code Chapter 89; Iowa Administrative Code Chapters 481-390 through 481-395", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies and commissioned by the division are accepted in lieu of inspections made by a state inspector.", "exemptions": "Section 89.4 identifies the objects that are exempted from section 89.3.", "id": "iowa", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/iowa/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSPECTIONS REQUIRED Iowa Code Chapter 89 Section 89.3 identifies the different equipment types, inspection type(s), and the inspection schedule(s) to be performed. Section 89.4 identifies the objects that are exempted from section 89.3. INSURANCE INSPECTION REQUIREMENTS 1.", "verified_fields": [ "exemptions", "state" ] }, { "state": "Kansas", "governing_body": "Office of the State Fire Marshal", "statute_citation": "Kansas Statutes Annotated, Chapter 44. Labor and Industries, Kansas Boiler Safety Act, K.S.A 44-913 et. seq.", "power_boiler_interval": "Annual certificate inspection (internal inspection); Annual external inspection while under pressure, if possible, at approximately a six-month interval from the certificate inspection.", "low_pressure_boiler_interval": "Steam heating boilers: Annual certificate inspection; A triennial internal inspection where construction permits. Hot-water supply boilers: a triennial external certificate inspection (under 400,000 BTU per hour). Low-pressure hot-water supply boilers with heat input over 400,000 BTU: an annual external certificate inspection.", "pressure_vessel_interval": "One-time inspection of new installations and the replacement of vessels 15 cubic feet and over constructed and installed after January 1, 1999.", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies and certified by the chief inspector are accepted in lieu of inspections made by a state inspector.", "exemptions": "Boilers and pressure vessels under the control of the US government. Fire engine boilers brought into the state for temporary use in times of emergency. Boilers and pressure vessels located on producing oil and gas leases or storage areas outside the limits of any municipality, used solely for oil and gas production purposes. Hot-water supply boilers which are directly fired with oil, gas, electricity, or solar energy and equipped with safety relief valves approved by the National Board and ASME, if none of the following limitations is exceeded: Heat input of 200,000 BTU per hour; Water temperature of 210\u00b0F; Nominal water capacity of 120 gallons. Pressure vessels constructed and installed prior to January 1, 1999.", "id": "kansas", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/kansas/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "STATE DEPARTMENT Robert Stimson, Acting Chief Boiler Inspector Office of the State Fire Marshal 800 S.W. Jackson St., Suite 104 Topeka , Kansas 66612 Telephone — 785.296.3401 Email — boiler.inspection@ks.gov rob.stimson@ks.gov Fax — 785.296.0151 EMPOWERMENT Legislative committees empowered to make, alter or amend rules and regulations. Boiler Board: No. DATE OF LAW PASSAGE: 1953 — repealed: 1975; reinstated: 1977 Date of latest amendment to law: April 2022. Date rules and regulations implemented: 1953 and 1977. Date of latest amendment to rules and regulations: April 2022. State statute: Kansas Statutes Annotated, Chapter 44. Labor and Industries, Kansas Boiler Safety Act, K.S.A 44-913 et. seq. RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "governing_body", "state", "statute_citation" ] }, { "state": "Kentucky", "governing_body": "Department of Housing, Buildings and Construction, Division of Plumbing", "statute_citation": "Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990", "power_boiler_interval": "annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible", "low_pressure_boiler_interval": "biennial internal and external inspections, where construction permits, with a two-month grace period allowed", "accepted_inspectors": "Department inspectors conduct all new installation inspections. For ongoing inspections, commissioned insurance company inspectors", "id": "kentucky", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/kentucky/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Department of Housing, Buildings and Construction oversees boiler inspections through its Division of Plumbing under Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990. Authorized inspector types: Department inspectors conduct all new installation inspections. For ongoing inspections, Kentucky accepts commissioned insurance company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible. Low-pressure boilers require biennial internal and external inspections, where construction permits, with a two-month grace period allowed.", "verified_fields": [ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "exemptions", "value": "Boilers and pressure vessels under federal control. Boilers and pressure vessels located on farms and used solely for agricultural purposes. Boilers and pressure vessels located at oil refineries. Steam or vapor boilers with pressure not exceeding 15 psi used for heating purposes in private residences. Hot-water heating boilers with a pressure not exceeding 30 psi and hot-water supply boilers in private residences. Any unfired pressure vessels used as containers for liquefied petroleum gases. Pressure vessels used for transportation of compressed gases. Pressure vessels containing air located on vehicles operating under the regulations of another state or federal authority.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Kentucky Revised Statutes , Chapter 234. Pressure vessels used for transportation of compressed gases constructed and operated in compliance with specifications and regulations of another state or federal authority. Pressure vessels containing air located on vehicles operating under the regulations of another state or federal authority. OBJECTS SUBJECT TO RULES FOR FIELD INSPECTION Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING. INSPECTIONS REQUIRED Power boilers: Annual internal and external inspection while not under pressure; Annual external inspection while under pressure, if possible. Low-pressure steam or vapor-heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial internal and external inspection where construction permits. A grace period of two months beyond the periods specified above may elapse between inspections.", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Department of Housing, Buildings and Construction, Division of Plumbing", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Department of Housing, Buildings and Construction oversees boiler inspections through its Division of Plumbing under Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990. Authorized inspector types: Department inspectors conduct all new installation inspections. For ongoing inspections, Kentucky accepts commissioned insurance company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible. Low-pressure boilers require biennial internal and external inspections, where construction permits, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "Department of Housing, Buildings, and Construction, Boiler & P.V. Inspection, Division of Plumbing", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Kentucky Revised Statutes , Chapter 234. Pressure vessels used for transportation of compressed gases constructed and operated in compliance with specifications and regulations of another state or federal authority. Pressure vessels containing air located on vehicles operating under the regulations of another state or federal authority. OBJECTS SUBJECT TO RULES FOR FIELD INSPECTION Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING. INSPECTIONS REQUIRED Power boilers: Annual internal and external inspection while not under pressure; Annual external inspection while under pressure, if possible. Low-pressure steam or vapor-heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial internal and external inspection where construction permits. A grace period of two months beyond the periods specified above may elapse between inspections.", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Department of Housing, Buildings and Construction oversees boiler inspections through its Division of Plumbing under Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990. Authorized inspector types: Department inspectors conduct all new installation inspections. For ongoing inspections, Kentucky accepts commissioned insurance company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible. Low-pressure boilers require biennial internal and external inspections, where construction permits, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "Kentucky Revised Statutes, Title XIX. Public Safety and Morals, Chapter 236.00 Boiler and Pressure Vessel Safety Act, Sections .005 through .990.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Kentucky Revised Statutes , Chapter 234. Pressure vessels used for transportation of compressed gases constructed and operated in compliance with specifications and regulations of another state or federal authority. Pressure vessels containing air located on vehicles operating under the regulations of another state or federal authority. OBJECTS SUBJECT TO RULES FOR FIELD INSPECTION Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING. INSPECTIONS REQUIRED Power boilers: Annual internal and external inspection while not under pressure; Annual external inspection while under pressure, if possible. Low-pressure steam or vapor-heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial internal and external inspection where construction permits. A grace period of two months beyond the periods specified above may elapse between inspections.", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Department of Housing, Buildings and Construction oversees boiler inspections through its Division of Plumbing under Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990. Authorized inspector types: Department inspectors conduct all new installation inspections. For ongoing inspections, Kentucky accepts commissioned insurance company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible. Low-pressure boilers require biennial internal and external inspections, where construction permits, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "Annual internal and external inspection while not under pressure; Annual external inspection while under pressure, if possible.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Kentucky Revised Statutes , Chapter 234. Pressure vessels used for transportation of compressed gases constructed and operated in compliance with specifications and regulations of another state or federal authority. Pressure vessels containing air located on vehicles operating under the regulations of another state or federal authority. OBJECTS SUBJECT TO RULES FOR FIELD INSPECTION Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING. INSPECTIONS REQUIRED Power boilers: Annual internal and external inspection while not under pressure; Annual external inspection while under pressure, if possible. Low-pressure steam or vapor-heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial internal and external inspection where construction permits. A grace period of two months beyond the periods specified above may elapse between inspections.", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "biennial internal and external inspections, where construction permits, with a two-month grace period allowed", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Department of Housing, Buildings and Construction oversees boiler inspections through its Division of Plumbing under Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990. Authorized inspector types: Department inspectors conduct all new installation inspections. For ongoing inspections, Kentucky accepts commissioned insurance company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible. Low-pressure boilers require biennial internal and external inspections, where construction permits, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "Low-pressure steam or vapor-heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial internal and external inspection where construction permits.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Kentucky Revised Statutes , Chapter 234. Pressure vessels used for transportation of compressed gases constructed and operated in compliance with specifications and regulations of another state or federal authority. Pressure vessels containing air located on vehicles operating under the regulations of another state or federal authority. OBJECTS SUBJECT TO RULES FOR FIELD INSPECTION Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING. INSPECTIONS REQUIRED Power boilers: Annual internal and external inspection while not under pressure; Annual external inspection while under pressure, if possible. Low-pressure steam or vapor-heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial internal and external inspection where construction permits. A grace period of two months beyond the periods specified above may elapse between inspections.", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "Department inspectors conduct all new installation inspections. For ongoing inspections, commissioned insurance company inspectors", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Department of Housing, Buildings and Construction oversees boiler inspections through its Division of Plumbing under Kentucky Revised Statutes, Title XIX, Chapter 236.00, Sections .005 through .990. Authorized inspector types: Department inspectors conduct all new installation inspections. For ongoing inspections, Kentucky accepts commissioned insurance company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible. Low-pressure boilers require biennial internal and external inspections, where construction permits, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Kentucky Revised Statutes , Chapter 234. Pressure vessels used for transportation of compressed gases constructed and operated in compliance with specifications and regulations of another state or federal authority. Pressure vessels containing air located on vehicles operating under the regulations of another state or federal authority. OBJECTS SUBJECT TO RULES FOR FIELD INSPECTION Same as OBJECTS SUBJECT TO RULES FOR CONSTRUCTION AND STAMPING. INSPECTIONS REQUIRED Power boilers: Annual internal and external inspection while not under pressure; Annual external inspection while under pressure, if possible. Low-pressure steam or vapor-heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial internal and external inspection where construction permits. A grace period of two months beyond the periods specified above may elapse between inspections.", "as_of": "2026-08-05" } ] } ] }, { "state": "Louisiana", "governing_body": "Louisiana State Fire Marshal Office, Mechanical Safety Section", "statute_citation": "Louisiana Revised Statutes, Title 23, Chapter 5, Part III, Regulations Affecting Boilers", "power_boiler_interval": "An annual external certificate inspection followed by an internal certificate inspection approximately six months after each external inspection. The interval between internal inspections may be extended for a period not to exceed 24 months on a stationary boiler provided certain conditions are met. Internal inspections may be extended up to 60 months on boilers that are adjunct to or part of a continuous process.", "low_pressure_boiler_interval": "A certificate inspection will be conducted biennially: Steam or vapor boilers: An external inspection and internal inspection biennially where construction permits; Hot-water heating and hot-water supply boilers: An external certificate inspection biennially, and \u2013 where construction permits \u2014 an internal inspection every six years based on date of construction; Potable water boilers/hot-water heaters: An external certificate inspection biennially.", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by deputy boiler inspectors.", "exemptions": "Boilers under federal control. Boilers on steam fire engines brought into the state for temporary use in times of emergency. Portable boilers used for agricultural purposes only. Boilers built for a pressure of 15 psig or less, for noncommercial use. All potable water boilers and hot-water heaters, except the provisions of the section shall not be applicable to Potable water boilers below one hundred twenty gallon capacity and less than two hundred thousand BTUs.", "id": "louisiana", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/louisiana/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Louisiana Revised Statutes, Title 23, Chapter 5, Part III, Regulations Affecting Boilers .", "verified_fields": [ "state", "statute_citation" ] }, { "state": "Maine", "governing_body": "Boiler and Pressure Vessel Safety Program, Office of Professional and Occupational Regulation", "statute_citation": "Maine Revised Statutes, Title 32. Professions and Occupations, Chapter 131. Boilers and Pressure Vessels, Sections 15101 through 15121.", "power_boiler_interval": "One annual internal certificate inspection; One annual external inspection, in operation, approximately six months from the certificate inspection.", "low_pressure_boiler_interval": "Low pressure steam heating boilers located in schoolhouses: one annual certificate inspection, which shall be an internal inspection every third year, with an external or internal inspection at the discretion of the inspector on the two intervening years. Low pressure hot-water supply boilers located in schoolhouses: one annual certificate inspection, which shall be an internal inspection where possible, every third year. Low pressure hot-water heating boilers located in schoolhouses: one annual certificate inspection, which shall be an internal inspection every third year, with an external inspection during the two intervening years.", "pressure_vessel_interval": "Initial inspection shall be an external safety inspection; Renewal certificate inspections are completed once every 3 years and it shall be an internal where construction permits.", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies and licensed by the Boiler and Pressure Vessel Safety Program are accepted in lieu of inspections made by a department inspector.", "exemptions": "Boilers and pressure vessels under federal control. Boilers and pressure vessels used for agricultural purposes only. Boilers used solely for propelling motor road vehicles. Boilers of steam fire engines brought into the state for temporary use in times of emergency to check conflagrations. Low pressure steam heating boilers, hot water heating boilers, and hot-water supply boilers, except those located in schoolhouses or those used as process boilers. Pressure vessels used for the transportation and storage of compressed or liquefied gases when constructed in compliance with specifications of the US Department of Transportation. Pressure vessels located in private residences and apartment buildings with fewer than six apartments. Pressure vessels having an internal or external operating pressure not exceeding 15 psi.", "id": "maine", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/maine/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure boilers: One annual internal certificate inspection; One annual external inspection, in operation, approximately six months from the certificate inspection. Miniature boilers: One annual certificate inspection; One biennial internal inspection. Cast-iron boilers: one annual certificate inspection while unit is in operation. Low pressure steam heating boilers located in schoolhouses: one annual certificate inspection, which shall be an internal inspection every third year, with an external or internal inspection at the discretion of the inspector on the two intervening years. Low pressure hot-water supply boilers located in schoolhouses: one annual certificate inspection, which shall be an internal inspection where possible, every third year, with an external or internal inspection at the discretion of the inspector during the two intervening years. Low pressure hot-water heating boilers located in schoolhouses: one annual certificate inspection, which shall be an internal inspection every third year, with an external inspection during the two intervening years. Low pressure process boilers: one annual certificate inspection, which shall be an internal inspection every third year, with an external inspection during the two intervening years at the discretion of the inspector. Pressure vessels: Initial inspection shall be an external safety inspection; Renewal certificate inspections are completed once every 3 years and it shall be an internal where construction permits. In the event, that an internal inspection is not feasible, the inspector must use an alternative method of determining material thickness for the shell and/or head.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ] }, { "state": "Maryland", "governing_body": "Department of Labor, Licensing and Regulation's Safety Inspections Unit", "statute_citation": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9", "power_boiler_interval": "annual internal inspections, where construction permits and annual external inspections performed while under pressure", "low_pressure_boiler_interval": "biennial certificate inspections", "accepted_inspectors": "commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request", "id": "maryland", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/maryland/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9. Authorized inspector types: Maryland accepts commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request. Inspection frequency: High-pressure boilers require annual internal inspections, where construction permits and annual external inspections are performed while under pressure. Low-pressure boilers require biennial certificate inspections.", "verified_fields": [ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "Pressure vessels: a biennial certificate inspection.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature boilers: Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible. Low-pressure boilers: a biennial certificate inspection. Pressure vessels: a biennial certificate inspection. Amusement attractions with low-pressure boiler and pressure vessel parts: annual certificate inspection. Nuclear vessels within the scope of this act shall be inspected and reported on such form (Section XI) with appropriate information as designated by the board. Model steam boilers (individually fabricated for noncommercial use, and primarily for demonstration, exhibition, or educational purposes, and not for profit): an annual external inspection and, to the extent possible, an internal inspection. Antique boilers: An annual internal inspection; Externally inspected while under pressure, if possible. Extended interval between internal inspections: the Board of Boiler Rules may extend the interval between inspections of certain power boilers to two years where: The boiler has internal continuous water treatment under the general supervision of a registered professional engineer having experience in the treatment of boiler water; The owner/user of such boiler keeps available for examination by the chief boiler inspector accurate records showing: The date and actual time such boiler is out of service and the reason or reasons therefor; Such chemical and physical analysis of samples of the boiler water taken at regular intervals of not more than 48 hours of operation, as well as adequately showing the condition of such water and any elements or characteristics thereof which are capable of producing corrosion or other deterioration of the boiler or its parts.", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Boilers and pressure vessels under federal control or regulation. Pressure vessels used for the transportation and storage of compressed gases when constructed in compliance with specifications of the US Department of Transportation. Air tanks installed on the right-of-way of railroads and used directly in the operation of trains. Air tanks located on vehicles operating under the rules of other state authorities. Pressure vessels operating at a working pressure not exceeding 15 psig. Hot-water supply boilers directly fired with oil, gas, or electricity when none of the following limitations is exceeded: A heat input of 200,000 BTU per hour; A water temperature of 210\u00b0F; A nominal water-containing capacity of 120 gallons. Boilers or pressure vessels located on farms and used solely for agricultural purposes. Heating boilers which are located in private residences or in apartment houses of fewer than six family units.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature boilers: Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible. Low-pressure boilers: a biennial certificate inspection. Pressure vessels: a biennial certificate inspection. Amusement attractions with low-pressure boiler and pressure vessel parts: annual certificate inspection. Nuclear vessels within the scope of this act shall be inspected and reported on such form (Section XI) with appropriate information as designated by the board. Model steam boilers (individually fabricated for noncommercial use, and primarily for demonstration, exhibition, or educational purposes, and not for profit): an annual external inspection and, to the extent possible, an internal inspection. Antique boilers: An annual internal inspection; Externally inspected while under pressure, if possible. Extended interval between internal inspections: the Board of Boiler Rules may extend the interval between inspections of certain power boilers to two years where: The boiler has internal continuous water treatment under the general supervision of a registered professional engineer having experience in the treatment of boiler water; The owner/user of such boiler keeps available for examination by the chief boiler inspector accurate records showing: The date and actual time such boiler is out of service and the reason or reasons therefor; Such chemical and physical analysis of samples of the boiler water taken at regular intervals of not more than 48 hours of operation, as well as adequately showing the condition of such water and any elements or characteristics thereof which are capable of producing corrosion or other deterioration of the boiler or its parts.", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Department of Labor, Licensing and Regulation's Safety Inspections Unit", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9. Authorized inspector types: Maryland accepts commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request. Inspection frequency: High-pressure boilers require annual internal inspections, where construction permits and annual external inspections are performed while under pressure. Low-pressure boilers require biennial certificate inspections.", "as_of": "2026-08-05" }, { "value": "Department of Labor, Licensing, and Regulation, Division of Labor and Industry, Safety Inspections Unit, Boilers and Pressure Vessels", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature boilers: Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible. Low-pressure boilers: a biennial certificate inspection. Pressure vessels: a biennial certificate inspection. Amusement attractions with low-pressure boiler and pressure vessel parts: annual certificate inspection. Nuclear vessels within the scope of this act shall be inspected and reported on such form (Section XI) with appropriate information as designated by the board. Model steam boilers (individually fabricated for noncommercial use, and primarily for demonstration, exhibition, or educational purposes, and not for profit): an annual external inspection and, to the extent possible, an internal inspection. Antique boilers: An annual internal inspection; Externally inspected while under pressure, if possible. Extended interval between internal inspections: the Board of Boiler Rules may extend the interval between inspections of certain power boilers to two years where: The boiler has internal continuous water treatment under the general supervision of a registered professional engineer having experience in the treatment of boiler water; The owner/user of such boiler keeps available for examination by the chief boiler inspector accurate records showing: The date and actual time such boiler is out of service and the reason or reasons therefor; Such chemical and physical analysis of samples of the boiler water taken at regular intervals of not more than 48 hours of operation, as well as adequately showing the condition of such water and any elements or characteristics thereof which are capable of producing corrosion or other deterioration of the boiler or its parts.", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9. Authorized inspector types: Maryland accepts commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request. Inspection frequency: High-pressure boilers require annual internal inspections, where construction permits and annual external inspections are performed while under pressure. Low-pressure boilers require biennial certificate inspections.", "as_of": "2026-08-05" }, { "value": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9, Boiler and Pressure Vessel Safety Act.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature boilers: Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible. Low-pressure boilers: a biennial certificate inspection. Pressure vessels: a biennial certificate inspection. Amusement attractions with low-pressure boiler and pressure vessel parts: annual certificate inspection. Nuclear vessels within the scope of this act shall be inspected and reported on such form (Section XI) with appropriate information as designated by the board. Model steam boilers (individually fabricated for noncommercial use, and primarily for demonstration, exhibition, or educational purposes, and not for profit): an annual external inspection and, to the extent possible, an internal inspection. Antique boilers: An annual internal inspection; Externally inspected while under pressure, if possible. Extended interval between internal inspections: the Board of Boiler Rules may extend the interval between inspections of certain power boilers to two years where: The boiler has internal continuous water treatment under the general supervision of a registered professional engineer having experience in the treatment of boiler water; The owner/user of such boiler keeps available for examination by the chief boiler inspector accurate records showing: The date and actual time such boiler is out of service and the reason or reasons therefor; Such chemical and physical analysis of samples of the boiler water taken at regular intervals of not more than 48 hours of operation, as well as adequately showing the condition of such water and any elements or characteristics thereof which are capable of producing corrosion or other deterioration of the boiler or its parts.", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal inspections, where construction permits and annual external inspections performed while under pressure", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9. Authorized inspector types: Maryland accepts commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request. Inspection frequency: High-pressure boilers require annual internal inspections, where construction permits and annual external inspections are performed while under pressure. Low-pressure boilers require biennial certificate inspections.", "as_of": "2026-08-05" }, { "value": "Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature boilers: Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible. Low-pressure boilers: a biennial certificate inspection. Pressure vessels: a biennial certificate inspection. Amusement attractions with low-pressure boiler and pressure vessel parts: annual certificate inspection. Nuclear vessels within the scope of this act shall be inspected and reported on such form (Section XI) with appropriate information as designated by the board. Model steam boilers (individually fabricated for noncommercial use, and primarily for demonstration, exhibition, or educational purposes, and not for profit): an annual external inspection and, to the extent possible, an internal inspection. Antique boilers: An annual internal inspection; Externally inspected while under pressure, if possible. Extended interval between internal inspections: the Board of Boiler Rules may extend the interval between inspections of certain power boilers to two years where: The boiler has internal continuous water treatment under the general supervision of a registered professional engineer having experience in the treatment of boiler water; The owner/user of such boiler keeps available for examination by the chief boiler inspector accurate records showing: The date and actual time such boiler is out of service and the reason or reasons therefor; Such chemical and physical analysis of samples of the boiler water taken at regular intervals of not more than 48 hours of operation, as well as adequately showing the condition of such water and any elements or characteristics thereof which are capable of producing corrosion or other deterioration of the boiler or its parts.", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "biennial certificate inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9. Authorized inspector types: Maryland accepts commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request. Inspection frequency: High-pressure boilers require annual internal inspections, where construction permits and annual external inspections are performed while under pressure. Low-pressure boilers require biennial certificate inspections.", "as_of": "2026-08-05" }, { "value": "Low-pressure boilers: a biennial certificate inspection.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature boilers: Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible. Low-pressure boilers: a biennial certificate inspection. Pressure vessels: a biennial certificate inspection. Amusement attractions with low-pressure boiler and pressure vessel parts: annual certificate inspection. Nuclear vessels within the scope of this act shall be inspected and reported on such form (Section XI) with appropriate information as designated by the board. Model steam boilers (individually fabricated for noncommercial use, and primarily for demonstration, exhibition, or educational purposes, and not for profit): an annual external inspection and, to the extent possible, an internal inspection. Antique boilers: An annual internal inspection; Externally inspected while under pressure, if possible. Extended interval between internal inspections: the Board of Boiler Rules may extend the interval between inspections of certain power boilers to two years where: The boiler has internal continuous water treatment under the general supervision of a registered professional engineer having experience in the treatment of boiler water; The owner/user of such boiler keeps available for examination by the chief boiler inspector accurate records showing: The date and actual time such boiler is out of service and the reason or reasons therefor; Such chemical and physical analysis of samples of the boiler water taken at regular intervals of not more than 48 hours of operation, as well as adequately showing the condition of such water and any elements or characteristics thereof which are capable of producing corrosion or other deterioration of the boiler or its parts.", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9. Authorized inspector types: Maryland accepts commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request. Inspection frequency: High-pressure boilers require annual internal inspections, where construction permits and annual external inspections are performed while under pressure. Low-pressure boilers require biennial certificate inspections.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors employed by insurance companies (special inspectors) and commissioned by the division are accepted in lieu of inspections made by a deputy inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature boilers: Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible. Low-pressure boilers: a biennial certificate inspection. Pressure vessels: a biennial certificate inspection. Amusement attractions with low-pressure boiler and pressure vessel parts: annual certificate inspection. Nuclear vessels within the scope of this act shall be inspected and reported on such form (Section XI) with appropriate information as designated by the board. Model steam boilers (individually fabricated for noncommercial use, and primarily for demonstration, exhibition, or educational purposes, and not for profit): an annual external inspection and, to the extent possible, an internal inspection. Antique boilers: An annual internal inspection; Externally inspected while under pressure, if possible. Extended interval between internal inspections: the Board of Boiler Rules may extend the interval between inspections of certain power boilers to two years where: The boiler has internal continuous water treatment under the general supervision of a registered professional engineer having experience in the treatment of boiler water; The owner/user of such boiler keeps available for examination by the chief boiler inspector accurate records showing: The date and actual time such boiler is out of service and the reason or reasons therefor; Such chemical and physical analysis of samples of the boiler water taken at regular intervals of not more than 48 hours of operation, as well as adequately showing the condition of such water and any elements or characteristics thereof which are capable of producing corrosion or other deterioration of the boiler or its parts.", "as_of": "2026-08-05" } ] } ] }, { "state": "Massachusetts", "governing_body": "Department of Fire Services, Chief of Engineering Inspections", "statute_citation": "The General Laws of Massachusetts, Part I. Administration of the Government, Title 20. Public Safety and Good Order, Chapter 146. Inspection of Boilers, Air Tanks, etc.", "power_boiler_interval": "One annual internal inspection; One annual external inspection with boiler in service at approximately a six-month interval from the internal inspection.", "low_pressure_boiler_interval": "Hot-water heating and hot-water supply boilers: One inspection annually; One internal inspection every three years where construction permits.", "pressure_vessel_interval": "Air tanks: one internal inspection every two years.", "accepted_inspectors": "Inspections, except first inspections, made by inspectors employed by Authorized Inspection Agencies and commissioned by the department are accepted in lieu of inspections made by a department inspector.", "exemptions": "All boilers, refrigeration and air conditioning systems, except when under the jurisdiction of the federal government. Heating boilers having less than 4 square feet grate surface; having a steam capacity less than 104 pounds per hour; used as a hot-water heating boiler with an output capacity less than 200,000 BTU per hour; used as a hot-water (or other liquid) supply boiler, having a heat input less than 200,000 BTU per hour, a water (or other liquid) temperature less than 200\u00b0F or a nominal water-containing capacity less than 120 gallons. Air tanks with inside diameter less than 6 inches; operating pressure less than 50 psi; or capacity less than 1 cubic foot.", "id": "massachusetts", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/massachusetts/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "The General Laws of Massachusetts, Part I. Administration of the Government, Title 20. Public Safety and Good Order, Chapter 146. Inspection of Boilers, Air Tanks, etc. RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "state", "statute_citation" ] }, { "state": "Michigan", "governing_body": "Department of Licensing and Regulatory Affairs' Boiler Division", "statute_citation": "Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947", "power_boiler_interval": "annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection", "low_pressure_boiler_interval": "biennial certificate inspections, with a two-month grace period allowed", "accepted_inspectors": "Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies", "id": "michigan", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/michigan/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.", "verified_fields": [ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "exemptions", "value": "Those under federal control. Swimming pool heaters and open car-wash heaters. Miniature steam or marine engines for hobby usage. A boiler used in power plants of self-propelled vehicles designed primarily for the transportation of persons or property upon a highway. Boilers used on mint farms for mint processing. A non-vaporizing, organic-fluid boiler meeting certain criteria. A low-pressure steam boiler that has a volume of less than 5 cubic feet and that does not have piped feed connect. Those on Tribal Land. Boilers used solely for agricultural purposes. Steam or vapor boilers not exceeding 15 psi and hot-water boilers not exceeding 160 psi or a temperature of 250\u00b0F located in private residences or apartment or condo buildings of fewer than six families.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Department of Licensing and Regulatory Affairs' Boiler Division", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "Department of Licensing and Regulatory Affairs, Bureau of Construction Codes, Boiler Division", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "A power boiler, process boiler, or high-pressure, high-temperature water boiler shall receive a certificate inspection annually and shall also be externally inspected annually, while under pressure, within six months from the date of the internal inspection.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "biennial certificate inspections, with a two-month grace period allowed", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "A low-pressure steam or vapor heating boiler shall receive a certificate inspection biennially. Hot-water heating and hot-water supply boilers shall receive a certificate inspection triennially.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.", "as_of": "2026-08-05" }, { "value": "Inspections, except first inspections and inspections of secondhand boilers, made by inspectors employed by insurance companies and licensed by the department are accepted in lieu of inspections made by a department inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] } ] }, { "state": "Minnesota", "governing_body": "Minnesota Department of Labor and Industry, Construction Codes and Licensing Division, Boiler Division", "statute_citation": "Minnesota Statutes \u2013 2023, Chapters 326B.93 to 326B.998, Boilers. Minnesota Rules \u2013 Chapter 5225.", "power_boiler_interval": "Boilers and steam generators: one annual inspection.", "low_pressure_boiler_interval": "Boilers and steam generators: one annual inspection.", "pressure_vessel_interval": "Unfired pressure vessels: biennial inspection.", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies and holding a valid Certificate of Competency issued by the department are accepted in lieu of inspections made by a department inspector.", "exemptions": "Boilers and pressure vessels under federal control. Boilers and pressure vessels in buildings occupied solely for residential purposes with accommodations for not more than five families. Railroad locomotives. Air tanks installed on the right-of-way of railroads. Unfired pressure vessels having an internal or external working pressure not exceeding 15 psig. Pressure vessels having an inside diameter not exceeding 6 inches. Boilers or pressure vessels located on farms and used solely for agricultural or horticultural purposes. Tanks or cylinders used for storage or transfer of liquefied petroleum gases. Unfired pressure vessels in petroleum refineries. Hot-water heating and other hot-liquid boilers not exceeding a heat input of 750,000 BTU per hour. Hot-water supply boilers not exceeding a heat input of 200,000 BTU per hour, or potable water heaters not exceeding 200,000 BTU per hour or a nominal water capacity of 120 gallons.", "id": "minnesota", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/minnesota/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers and steam generators: one annual inspection. Unfired pressure vessels: biennial inspection. Stationary show boilers used for display and demonstration: Biennial inspection. Note: Refer to last two paragraphs under Insurance Inspection Requirements. INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors employed by insurance companies and holding a valid Certificate of Competency issued by the department are accepted in lieu of inspections made by a department inspector. Reports of inspection must be filed with the department on National Board forms within 21 days after inspection. Reports of boiler inspections are required annually; reports of pressure vessels are required biennially, see Minnesota Statute 326B.998.", "verified_fields": [ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval", "state" ] }, { "state": "Mississippi", "governing_body": "Mississippi State Department of Health, Boiler and Pressure Vessel Safety Branch", "statute_citation": "Mississippi Code, Title 45. Public Safety and Good Order, Chapter 23. Boiler and Pressure Vessel Safety.", "power_boiler_interval": "Power boilers and high-pressure, high-temperature water boilers shall receive a certificate inspection annually (or as the board may require) and shall receive an annual external inspection while under pressure, if possible.", "low_pressure_boiler_interval": "Heating boilers shall receive a certificate inspection biennially.", "pressure_vessel_interval": "Pressure vessels subject to internal corrosion shall receive a certificate inspection biennially. Pressure vessels not subject to internal corrosion shall receive a certificate inspection at intervals set by the board.", "accepted_inspectors": "Inspections made by insurance company inspectors commissioned by the board are accepted in lieu of inspections made by a department inspector.", "exemptions": "Boilers and pressure vessels located on US government property and/or under federal government control. Pressure vessels used for transportation and storage of compressed gases when constructed in compliance with specifications of the US Department of Transportation. Air tanks located on vehicles operating under the rules of other state authorities. Air tanks installed on the right-of-way of railroads. Pressure vessels that do not exceed: 5 cubic feet in volume and 250 psig pressure; 1-1/2 cubic feet in volume and 600 psig pressure; An inside diameter of 6 inches with no limitation on pressure. Pressure vessels operating at a working pressure not exceeding 15 psig. Vessels with a nominal water-containing capacity of 120 gallons or less. Heating boilers located in private residences or apartment houses of fewer than six family units.", "id": "mississippi", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/mississippi/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Pressure vessels covered under the Liquefied Compressed Gas Equipment Inspection Law of Mississippi (Sections 75-57-1 through 75-57-63), Mississippi Code of 1972 . Air-receiving tanks and attached tanks used in connection with automobile filling stations that do not exceed 15 cubic feet in volume and 250 psig pressure and used primarily to increase pressure in automobile tires. INSPECTIONS REQUIRED Power boilers and high-pressure, high-temperature water boilers shall receive a certificate inspection annually (or as the board may require) and shall receive an annual external inspection while under pressure, if possible. Heating boilers shall receive a certificate inspection biennially. Pressure vessels subject to internal corrosion shall receive a certificate inspection biennially. Pressure vessels not subject to internal corrosion shall receive a certificate inspection at intervals set by the board.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval", "state" ] }, { "state": "Missouri", "governing_body": "Division of Fire Safety, Boiler and Pressure Vessel Safety Unit", "statute_citation": "Missouri Revised Statutes, Chapter 650. Department of Public Safety, Boiler and Pressure Vessel Act, Sections 200 through 290. Rules of Department of Public Safety, Division 40, Chapter 2, Boiler and Pressure Vessel Safety Rules.", "power_boiler_interval": "An annual certificate inspection which shall be an internal inspection where construction permits; An annual external inspection while under normal operating conditions.", "low_pressure_boiler_interval": "Low-pressure boilers and pressure vessels: A biennial certificate inspection: Steam or vapor boilers shall have an external inspection and an internal inspection biennially where construction permits; Hot-water heating and hot-water supply boilers shall have an external inspection biennially and where construction permits, an internal inspection at the discretion of the inspector.", "pressure_vessel_interval": "Pressure vessels shall have an external inspection biennially.", "accepted_inspectors": "Inspectors employed by insurance companies and approved owner/user inspection agencies are accepted in lieu of inspections made by the department.", "exemptions": "Water heaters, pool heaters, and hot-water supply boilers in which none of the following limitations is exceeded: A heat input of 200,000 BTU per hour; A water temperature of 210\u00b0F; A nominal water-containing capacity of 120 gallons. Hot-water storage tanks less than or equal to 120 gallons. Pressure vessels that have an internal volume of 6\" or less. Pressure vessels that are 1 1/2 cu. ft. in volume or less. Pressure vessels that are operated at 15 psig or less. Pressure vessels that do not exceed either 200 psig or 10 cu. ft. in volume.", "id": "missouri", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/missouri/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers; high-pressure, high-temperature water boilers; waste heat boilers; and unfired steam boilers and thermal fluid heaters: An annual certificate inspection which shall be an internal inspection where construction permits; An annual external inspection while under normal operating conditions. Low-pressure boilers and pressure vessels: A biennial certificate inspection: Steam or vapor boilers shall have an external inspection and an internal inspection biennially where construction permits; Hot-water heating and hot-water supply boilers shall have an external inspection biennially and where construction permits, an internal inspection at the discretion of the inspector; Pressure vessels shall have an external inspection biennially.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ] }, { "state": "Montana", "governing_body": "Department of Labor and Industry, Building Codes Bureau, Boiler, Elevator, Weights and Measures", "statute_citation": "Montana Code 2001, Title 50. Health and Safety, Chapter 60. Building Construction Standards and Chapter 74. Boiler and Steam Engines.", "power_boiler_interval": "Steam heating and power boilers: annual internal inspection. All manually-fired boilers and all boilers and banks of boilers rated with a total input of 400,000 BTU per hour or greater: annual inspection.", "low_pressure_boiler_interval": "All automatically fired boilers rated with an input of less than 400,000 BTU per hour: biennial inspection.", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies may be accepted in lieu of inspections made by bureau inspectors as equivalent to those of the state inspectors. Each such special inspector shall hold a certificate as boiler inspector issued by the National Board of Boiler and Pressure Vessel Inspectors.", "exemptions": "Boilers under federal control. Steam-heating boilers operated at not over 15 psig in private residences or apartments of six or fewer families. Hot-water heating or supply boilers operated at not over 50 psig and temperatures not over 250\u00b0F when in private residences, or apartments of six or fewer families.", "id": "montana", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/montana/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "All manually-fired boilers and all boilers and banks of boilers rated with a total input of 400,000 BTU per hour or greater: annual inspection. All automatically fired boilers rated with an input of less than 400,000 BTU per hour: biennial inspection. Steam heating and power boilers: annual internal inspection. This inspection may be performed during a scheduled maintenance shutdown with prior approval from the department. If located in a school, day-care center, hospital, rest home, retirement center, or place of assembly with a capacity of more than 100 persons: an annual inspection is required.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval" ] }, { "state": "Nebraska", "governing_body": "Nebraska State Fire Marshal Agency, Boiler Inspection Division", "statute_citation": "Nebraska Revised Statutes, Boiler Inspection Act. Title 81, Sections 81-5,165 to 81-5,189. Nebraska Administrative Code, Title 229. Chapters 1 through 28.", "power_boiler_interval": "Power boilers and high-pressure, high-temperature water boilers shall receive an internal inspection annually where construction permits and an external inspection while in operation, if possible; otherwise, it shall be as complete an inspection as possible. All jurisdictional boilers shall receive an annual external certificate inspection.", "low_pressure_boiler_interval": "Steam or vapor boilers shall receive an external inspection annually to renew the certificate and an internal inspection biennially where construction permits. Pool heaters, spa heaters, hot water heating boilers and hot water supply boilers shall receive an external inspection annually to renew the certificate, and, where construction permits, an internal inspection every four years from the date of manufacturer's completion.", "pressure_vessel_interval": "Pressure vessels subject to internal corrosion shall be inspected internally and externally biennially. Pressure vessels not subject to corrosion shall receive an external inspection biennially. Pressure vessels not subject to internal corrosion shall be inspected internally, where construction permits, quinquennially (every five years).", "accepted_inspectors": "Inspections made by Special Inspectors employed by National Board Accredited Authorized Inspection Agencies are accepted in lieu of inspections made by an agency inspector.", "exemptions": "Boilers under federal jurisdiction and control. Boilers of railway locomotives subject to federal inspection. Boilers operated and regularly inspected by railway companies operating in interstate commerce. Boilers used exclusively for agricultural purposes. Steam-heating boilers in single family residences and apartment houses with four or fewer units, using a pressure of less than 15 psi. Heating boilers using water in single family residences and apartment houses with four or fewer units, using a pressure of less than 30 psi. Fire engine boilers brought into the state for temporary use in times of emergency. Hot-water supply boilers and water heaters if none of the following limitations is exceeded: 200,000 BTU per hour of input; 120 gallons of nominal capacity; or 210\u00b0F output. Unfired pressure vessels not exceeding 5 cubic feet in volume or a pressure of 250 psi.", "id": "nebraska", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/nebraska/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Nebraska Administrative Code and the National Board Inspection Code , or API-510, as applicable. INSURANCE INSPECTION REQUIREMENTS Inspections made by Special Inspectors employed by National Board Accredited Authorized Inspection Agencies are accepted in lieu of inspections made by an agency inspector.", "verified_fields": [ "accepted_inspectors", "state" ] }, { "state": "Nevada", "governing_body": "Department of Business & Industry, Division of Industrial Relations, Mechanical Compliance Section", "statute_citation": "Nevada Administrative Code, Title 455C. Boilers, Elevators, and Pressure Vessels", "power_boiler_interval": "One annual internal inspection; One annual external inspection at approximately a six-month interval from the internal inspection.", "low_pressure_boiler_interval": "Low-pressure steam heating boilers: one annual external inspection. Where design and construction permit, an internal inspection shall be conducted biennially. Hot-water heating boilers and hot-water supply boilers: one internal inspection biennially if design and construction permit and inspector/special inspector requests it or external including operational testing of all controls and safety devices. Lined potable water heaters: one biennial external inspection including operational testing of all controls and safety devices.", "pressure_vessel_interval": "Mechanical Compliance Section jurisdiction: One external inspection quadrennially; internal if design and construction permit. Mine Section jurisdiction: One external inspection triennially; internal if design and construction permit.", "accepted_inspectors": "An inspection made by a special inspector (employed by an inspection entity), holding a Certificate of Competency received from the division, is accepted in lieu of an inspection made by a Jurisdictional inspector.", "exemptions": "Objects meeting exemption rules per NAC 455C.114", "id": "nevada", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/nevada/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Nevada Administrative Code, Title 455C. Boilers, Elevators, and Pressure Vessels Mine Section:", "verified_fields": [ "state", "statute_citation" ] }, { "state": "New Hampshire", "governing_body": "New Hampshire Department of Labor", "statute_citation": "New Hampshire Revised Statutes, Annotated and Administrative Rules, New Hampshire Department of Labor, Title 12. Public Safety and Welfare, Chapter 157-A. Boilers and Pressure Vessels, Sections A1 through A14.", "power_boiler_interval": "One annual certificate inspection; One annual external inspection while under pressure, if possible.", "low_pressure_boiler_interval": "one biennial certificate inspection, with an internal inspection at least once quadrennially where construction permits", "pressure_vessel_interval": "one biennial certificate inspection", "accepted_inspectors": "Inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.", "exemptions": "Properties used exclusively as private residences or apartment houses of fewer than three family units. Properties used exclusively as private residences or apartment houses with three or more family units with an output of less than 200,000 BTU per hour.", "id": "new-hampshire", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/new-hampshire/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature water boilers: One annual certificate inspection; One annual external inspection while under pressure, if possible. Low-pressure steam or vapor heating boilers, hot-water heating and hot-water supply boilers: one biennial certificate inspection, with an internal inspection at least once quadrennially where construction permits. Pressure vessels: one biennial certificate inspection.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ] }, { "state": "New Jersey", "governing_body": "Department of Labor and Workforce Development's Mechanical Inspection Bureau", "statute_citation": "New Jersey State Statutes, Title 34, and Administrative Code 12:90", "power_boiler_interval": "annual internal and external inspections", "low_pressure_boiler_interval": "annual external inspections and biennial internal inspections", "accepted_inspectors": "commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs", "id": "new-jersey", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/new-jersey/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "New Jersey State Statutes, Title 34, and Administrative Code 12:90. Authorized inspector types: New Jersey accepts commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs. Inspection frequency: High-pressure boilers require annual internal and external inspections. Low-pressure boilers require annual external inspections and biennial internal inspections.", "verified_fields": [ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "Each pressure vessel shall receive a certificate inspection triennially (for those not under owner-user inspection agency).", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers: An annual internal and external inspection for steam boilers; An annual external inspection and biennial internal inspection for hot-water boilers. Pressure Vessels - Each pressure vessel, except for “UM” stamped pressure vessels, shall be subject to either initial in-service inspection (for a newly manufactured pressure vessel) or initial field certificate inspection (for an existing pressure vessel). The initial field certificate inspection of existing pressure vessels shall take place by October 6, 2011. Each pressure vessel, with the exception of pressure vessels that are under the supervision of a registered owner-user inspection agency, shall receive a certificate inspection triennially. Pressure vessels and unfired boilers that are under the supervision of a registered owner-user inspection agency shall be inspected at intervals required by the National Board Inspection Code or API-510, as applicable. The inspection of any pressure vessel(s) contained within a refrigeration system shall be conducted pursuant to the regulation on refrigeration systems and is not part of the pressure vessel inspection requirements.", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Steam or hot-water boilers having less than 10 square feet of heating surface. Steam or hot-water boilers having a heat input of less than 10 kW or 40,000 BTU per hour. Steam boilers operating at not exceeding 15 psi steam when serving dwellings of fewer than six family units or accommodation of less than 25 persons.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers: An annual internal and external inspection for steam boilers; An annual external inspection and biennial internal inspection for hot-water boilers. Pressure Vessels - Each pressure vessel, except for “UM” stamped pressure vessels, shall be subject to either initial in-service inspection (for a newly manufactured pressure vessel) or initial field certificate inspection (for an existing pressure vessel). The initial field certificate inspection of existing pressure vessels shall take place by October 6, 2011. Each pressure vessel, with the exception of pressure vessels that are under the supervision of a registered owner-user inspection agency, shall receive a certificate inspection triennially. Pressure vessels and unfired boilers that are under the supervision of a registered owner-user inspection agency shall be inspected at intervals required by the National Board Inspection Code or API-510, as applicable. The inspection of any pressure vessel(s) contained within a refrigeration system shall be conducted pursuant to the regulation on refrigeration systems and is not part of the pressure vessel inspection requirements.", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Department of Labor and Workforce Development's Mechanical Inspection Bureau", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "New Jersey State Statutes, Title 34, and Administrative Code 12:90. Authorized inspector types: New Jersey accepts commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs. Inspection frequency: High-pressure boilers require annual internal and external inspections. Low-pressure boilers require annual external inspections and biennial internal inspections.", "as_of": "2026-08-05" }, { "value": "Mechanical Inspection Bureau of Boiler and Pressure Vessel Compliance, Department of Labor and Workforce Development, Division of Public Safety and Occupational Safety & Health", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers: An annual internal and external inspection for steam boilers; An annual external inspection and biennial internal inspection for hot-water boilers. Pressure Vessels - Each pressure vessel, except for “UM” stamped pressure vessels, shall be subject to either initial in-service inspection (for a newly manufactured pressure vessel) or initial field certificate inspection (for an existing pressure vessel). The initial field certificate inspection of existing pressure vessels shall take place by October 6, 2011. Each pressure vessel, with the exception of pressure vessels that are under the supervision of a registered owner-user inspection agency, shall receive a certificate inspection triennially. Pressure vessels and unfired boilers that are under the supervision of a registered owner-user inspection agency shall be inspected at intervals required by the National Board Inspection Code or API-510, as applicable. The inspection of any pressure vessel(s) contained within a refrigeration system shall be conducted pursuant to the regulation on refrigeration systems and is not part of the pressure vessel inspection requirements.", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "New Jersey State Statutes, Title 34, and Administrative Code 12:90", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "New Jersey State Statutes, Title 34, and Administrative Code 12:90. Authorized inspector types: New Jersey accepts commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs. Inspection frequency: High-pressure boilers require annual internal and external inspections. Low-pressure boilers require annual external inspections and biennial internal inspections.", "as_of": "2026-08-05" }, { "value": "New Jersey State Statutes, Title 34. Labor and Workers Compensation, Boilers and Pressure Vessels, New Jersey Administrative Code, 12:90.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers: An annual internal and external inspection for steam boilers; An annual external inspection and biennial internal inspection for hot-water boilers. Pressure Vessels - Each pressure vessel, except for “UM” stamped pressure vessels, shall be subject to either initial in-service inspection (for a newly manufactured pressure vessel) or initial field certificate inspection (for an existing pressure vessel). The initial field certificate inspection of existing pressure vessels shall take place by October 6, 2011. Each pressure vessel, with the exception of pressure vessels that are under the supervision of a registered owner-user inspection agency, shall receive a certificate inspection triennially. Pressure vessels and unfired boilers that are under the supervision of a registered owner-user inspection agency shall be inspected at intervals required by the National Board Inspection Code or API-510, as applicable. The inspection of any pressure vessel(s) contained within a refrigeration system shall be conducted pursuant to the regulation on refrigeration systems and is not part of the pressure vessel inspection requirements.", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "New Jersey State Statutes, Title 34, and Administrative Code 12:90. Authorized inspector types: New Jersey accepts commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs. Inspection frequency: High-pressure boilers require annual internal and external inspections. Low-pressure boilers require annual external inspections and biennial internal inspections.", "as_of": "2026-08-05" }, { "value": "An annual internal and external inspection for steam boilers", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers: An annual internal and external inspection for steam boilers; An annual external inspection and biennial internal inspection for hot-water boilers. Pressure Vessels - Each pressure vessel, except for “UM” stamped pressure vessels, shall be subject to either initial in-service inspection (for a newly manufactured pressure vessel) or initial field certificate inspection (for an existing pressure vessel). The initial field certificate inspection of existing pressure vessels shall take place by October 6, 2011. Each pressure vessel, with the exception of pressure vessels that are under the supervision of a registered owner-user inspection agency, shall receive a certificate inspection triennially. Pressure vessels and unfired boilers that are under the supervision of a registered owner-user inspection agency shall be inspected at intervals required by the National Board Inspection Code or API-510, as applicable. The inspection of any pressure vessel(s) contained within a refrigeration system shall be conducted pursuant to the regulation on refrigeration systems and is not part of the pressure vessel inspection requirements.", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "annual external inspections and biennial internal inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "New Jersey State Statutes, Title 34, and Administrative Code 12:90. Authorized inspector types: New Jersey accepts commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs. Inspection frequency: High-pressure boilers require annual internal and external inspections. Low-pressure boilers require annual external inspections and biennial internal inspections.", "as_of": "2026-08-05" }, { "value": "An annual external inspection and biennial internal inspection for hot-water boilers", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers: An annual internal and external inspection for steam boilers; An annual external inspection and biennial internal inspection for hot-water boilers. Pressure Vessels - Each pressure vessel, except for “UM” stamped pressure vessels, shall be subject to either initial in-service inspection (for a newly manufactured pressure vessel) or initial field certificate inspection (for an existing pressure vessel). The initial field certificate inspection of existing pressure vessels shall take place by October 6, 2011. Each pressure vessel, with the exception of pressure vessels that are under the supervision of a registered owner-user inspection agency, shall receive a certificate inspection triennially. Pressure vessels and unfired boilers that are under the supervision of a registered owner-user inspection agency shall be inspected at intervals required by the National Board Inspection Code or API-510, as applicable. The inspection of any pressure vessel(s) contained within a refrigeration system shall be conducted pursuant to the regulation on refrigeration systems and is not part of the pressure vessel inspection requirements.", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "New Jersey State Statutes, Title 34, and Administrative Code 12:90. Authorized inspector types: New Jersey accepts commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs. Inspection frequency: High-pressure boilers require annual internal and external inspections. Low-pressure boilers require annual external inspections and biennial internal inspections.", "as_of": "2026-08-05" }, { "value": "Inspections made by commissioned inspectors employed by an authorized inspection agency licensed to do business in the state and holding a Certificate of Competency from the department are accepted in lieu of inspections made by department inspectors.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers: An annual internal and external inspection for steam boilers; An annual external inspection and biennial internal inspection for hot-water boilers. Pressure Vessels - Each pressure vessel, except for “UM” stamped pressure vessels, shall be subject to either initial in-service inspection (for a newly manufactured pressure vessel) or initial field certificate inspection (for an existing pressure vessel). The initial field certificate inspection of existing pressure vessels shall take place by October 6, 2011. Each pressure vessel, with the exception of pressure vessels that are under the supervision of a registered owner-user inspection agency, shall receive a certificate inspection triennially. Pressure vessels and unfired boilers that are under the supervision of a registered owner-user inspection agency shall be inspected at intervals required by the National Board Inspection Code or API-510, as applicable. The inspection of any pressure vessel(s) contained within a refrigeration system shall be conducted pursuant to the regulation on refrigeration systems and is not part of the pressure vessel inspection requirements.", "as_of": "2026-08-05" } ] } ] }, { "state": "New Mexico", "governing_body": "Regulation and Licensing Department, Construction Industries Division", "statute_citation": "New Mexico Administrative Code, Title 14. Housing and Construction, Chapter 9. Mechanical Codes, Part 4. Boilers.", "power_boiler_interval": "An annual external inspection; An annual internal inspection, where construction permits.", "low_pressure_boiler_interval": "A biennial external inspection; An internal inspection if need indicates. (Applies to low-pressure steam boilers and low-pressure, hot-water heating boilers, and hot-water supply boilers.)", "accepted_inspectors": "Any inspection agency, authorized by the National Board, licensed to sell boiler or pressure vessel insurance in New Mexico, and insuring a boiler located in the state is required to inspect. Insurance company inspectors must hold a National Board Commission and be commissioned by the state.", "exemptions": "Public utilities, rural electric cooperatives, mine processing, refinery processing, gas processing, and lumber industries (sawmill only). Listed and approved potable water heaters when heat input does not exceed 200,000 BTU per hour, water temperature does not exceed 250\u00b0F and 160 psi pressure, and nominal water-containing capacity does not exceed 120 gallons.", "id": "new-mexico", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/new-mexico/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Any inspection agency, authorized by the National Board, licensed to sell boiler or pressure vessel insurance in New Mexico, and insuring a boiler located in the state is required to inspect. Insurance company inspectors must hold a National Board Commission and be commissioned by the state. CERTIFICATE OF INSPECTION A final mechanical inspection is issued by the inspector upon successful inspection.", "verified_fields": [ "accepted_inspectors", "state" ] }, { "state": "New York", "governing_body": "New York Department of Labor's Boiler Safety Bureau", "statute_citation": "New York State Laws, Labor, Chapter 31, Article 7, Section 204", "power_boiler_interval": "annual internal and external inspections, with external inspections conducted approximately six months after internal inspections", "low_pressure_boiler_interval": "triennial internal inspections and biennial external inspections (steam); internal inspections every five years and biennial external inspections (hot-water)", "accepted_inspectors": "commissioned insurance company inspectors and National Board-commissioned shop inspectors", "id": "new-york", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/new-york/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The New York Department of Labor’s Boiler Safety Bureau administers inspections under New York State Laws, Labor, Chapter 31, Article 7, Section 204. Authorized inspector types: New York accepts commissioned insurance company inspectors and National Board-commissioned shop inspectors. Inspection frequency: High-pressure steam boilers require annual internal and external inspections, with external inspections conducted approximately six months after internal inspections.", "verified_fields": [ "accepted_inspectors", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "exemptions", "value": "Boilers located on farms and used solely for agricultural purposes. Steam or vapor boilers operating at a gage pressure of not more than 15 psi located in dwellings occupied by fewer than six families. Hot-water boilers located in dwellings occupied by fewer than six families. Low-pressure boilers under 100,000 BTU per hour.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "New York State Laws, Labor, Chapter 31. Article 7, Section 204. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "New York Department of Labor's Boiler Safety Bureau", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The New York Department of Labor’s Boiler Safety Bureau administers inspections under New York State Laws, Labor, Chapter 31, Article 7, Section 204. Authorized inspector types: New York accepts commissioned insurance company inspectors and National Board-commissioned shop inspectors. Inspection frequency: High-pressure steam boilers require annual internal and external inspections, with external inspections conducted approximately six months after internal inspections.", "as_of": "2026-08-05" }, { "value": "New York Department of Labor, Boiler Safety Bureau", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "New York State Laws, Labor, Chapter 31. Article 7, Section 204. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "New York State Laws, Labor, Chapter 31, Article 7, Section 204", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The New York Department of Labor’s Boiler Safety Bureau administers inspections under New York State Laws, Labor, Chapter 31, Article 7, Section 204. Authorized inspector types: New York accepts commissioned insurance company inspectors and National Board-commissioned shop inspectors. Inspection frequency: High-pressure steam boilers require annual internal and external inspections, with external inspections conducted approximately six months after internal inspections.", "as_of": "2026-08-05" }, { "value": "New York State Laws, Labor, Chapter 31. Article 7, Section 204.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "New York State Laws, Labor, Chapter 31. Article 7, Section 204. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections, with external inspections conducted approximately six months after internal inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The New York Department of Labor’s Boiler Safety Bureau administers inspections under New York State Laws, Labor, Chapter 31, Article 7, Section 204. Authorized inspector types: New York accepts commissioned insurance company inspectors and National Board-commissioned shop inspectors. Inspection frequency: High-pressure steam boilers require annual internal and external inspections, with external inspections conducted approximately six months after internal inspections.", "as_of": "2026-08-05" }, { "value": "High-pressure steam boilers: Internal 1 Year, External 1 Year. High-pressure hot-water boilers: Internal 3 Years (annually if equipped with manholes and handholes), External 1 Year.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "New York State Laws, Labor, Chapter 31. Article 7, Section 204. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "triennial internal inspections and biennial external inspections (steam); internal inspections every five years and biennial external inspections (hot-water)", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The New York Department of Labor’s Boiler Safety Bureau administers inspections under New York State Laws, Labor, Chapter 31, Article 7, Section 204. Authorized inspector types: New York accepts commissioned insurance company inspectors and National Board-commissioned shop inspectors. Inspection frequency: High-pressure steam boilers require annual internal and external inspections, with external inspections conducted approximately six months after internal inspections.", "as_of": "2026-08-05" }, { "value": "Low-pressure steam boilers: Internal 3 Years, External 2 Years. Low-pressure hot-water boilers: Internal 5 Years, External 2 Years.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "New York State Laws, Labor, Chapter 31. Article 7, Section 204. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "commissioned insurance company inspectors and National Board-commissioned shop inspectors", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The New York Department of Labor’s Boiler Safety Bureau administers inspections under New York State Laws, Labor, Chapter 31, Article 7, Section 204. Authorized inspector types: New York accepts commissioned insurance company inspectors and National Board-commissioned shop inspectors. Inspection frequency: High-pressure steam boilers require annual internal and external inspections, with external inspections conducted approximately six months after internal inspections.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "New York State Laws, Labor, Chapter 31. Article 7, Section 204. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] } ] }, { "state": "New York City", "governing_body": "New York City Department of Buildings", "statute_citation": "New York State Industrial Code Rules 4 and 14", "power_boiler_interval": "annual internal and external inspections (steam); annual external inspections and triennial internal inspections (hot-water)", "low_pressure_boiler_interval": "annual external inspections and triennial internal inspections (steam); annual external inspections and internal inspections every five years (hot-water)", "accepted_inspectors": "Department inspectors conduct all first inspections. For subsequent inspections, commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections", "id": "new-york-city", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/new-york-city/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The New York City Department of Buildings administers inspections under New York State Industrial Code Rules 4 and 14. Authorized inspector types: Department inspectors conduct all first inspections. For subsequent inspections, New York City accepts commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections. Inspection frequency: High-pressure steam boilers require annual internal and external inspections. High-pressure hot-water boilers require annual external inspections and triennial internal inspections. Low-pressure steam boilers require annual external inspections and triennial internal inspections, while low-pressure hot-water boilers require annual external inspections and internal inspections every five years.", "verified_fields": [ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "exemptions", "value": "Boilers subject to inspection or control of a federal government agency. Boilers located on farms and used solely for agricultural purposes. Steam or vapor boilers operating at a gage pressure of not more than 15 psi, located in a dwelling occupied by fewer than six families and less than 350,000 BTU input. Hot-water boilers located in a dwelling occupied by fewer than six families and less than 350,000 BTU input.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure steam boilers: One annual external inspection; One annual internal inspection. High-pressure, high-temperature hot-water boilers: One annual external inspection; One internal inspection triennially. If equipped with manholes and handholes, an annual inspection is required. Such boilers shall be inspected externally annually approximately six months after each internal inspection. Low-pressure steam boilers: External inspection annually; One internal inspection triennially. Low-pressure, hot-water boilers: External inspection annually; One internal inspection quinquennially (every five years). New boilers shall be hydrostatically tested upon installation and prior to service. Boilers shall be tested to 60 psi or 1-1/2 times the design pressure, whichever is greater.", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "New York City Department of Buildings", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The New York City Department of Buildings administers inspections under New York State Industrial Code Rules 4 and 14. Authorized inspector types: Department inspectors conduct all first inspections. For subsequent inspections, New York City accepts commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections. Inspection frequency: High-pressure steam boilers require annual internal and external inspections. High-pressure hot-water boilers require annual external inspections and triennial internal inspections. Low-pressure steam boilers require annual external inspections and triennial internal inspections, while low-pressure hot-water boilers require annual external inspections and internal inspections every five years.", "as_of": "2026-08-05" }, { "value": "City of New York, Department of Buildings", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure steam boilers: One annual external inspection; One annual internal inspection. High-pressure, high-temperature hot-water boilers: One annual external inspection; One internal inspection triennially. If equipped with manholes and handholes, an annual inspection is required. Such boilers shall be inspected externally annually approximately six months after each internal inspection. Low-pressure steam boilers: External inspection annually; One internal inspection triennially. Low-pressure, hot-water boilers: External inspection annually; One internal inspection quinquennially (every five years). New boilers shall be hydrostatically tested upon installation and prior to service. Boilers shall be tested to 60 psi or 1-1/2 times the design pressure, whichever is greater.", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "New York State Industrial Code Rules 4 and 14", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The New York City Department of Buildings administers inspections under New York State Industrial Code Rules 4 and 14. Authorized inspector types: Department inspectors conduct all first inspections. For subsequent inspections, New York City accepts commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections. Inspection frequency: High-pressure steam boilers require annual internal and external inspections. High-pressure hot-water boilers require annual external inspections and triennial internal inspections. Low-pressure steam boilers require annual external inspections and triennial internal inspections, while low-pressure hot-water boilers require annual external inspections and internal inspections every five years.", "as_of": "2026-08-05" }, { "value": "New York State Industrial Code Rules 4 and 14.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure steam boilers: One annual external inspection; One annual internal inspection. High-pressure, high-temperature hot-water boilers: One annual external inspection; One internal inspection triennially. If equipped with manholes and handholes, an annual inspection is required. Such boilers shall be inspected externally annually approximately six months after each internal inspection. Low-pressure steam boilers: External inspection annually; One internal inspection triennially. Low-pressure, hot-water boilers: External inspection annually; One internal inspection quinquennially (every five years). New boilers shall be hydrostatically tested upon installation and prior to service. Boilers shall be tested to 60 psi or 1-1/2 times the design pressure, whichever is greater.", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections (steam); annual external inspections and triennial internal inspections (hot-water)", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The New York City Department of Buildings administers inspections under New York State Industrial Code Rules 4 and 14. Authorized inspector types: Department inspectors conduct all first inspections. For subsequent inspections, New York City accepts commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections. Inspection frequency: High-pressure steam boilers require annual internal and external inspections. High-pressure hot-water boilers require annual external inspections and triennial internal inspections. Low-pressure steam boilers require annual external inspections and triennial internal inspections, while low-pressure hot-water boilers require annual external inspections and internal inspections every five years.", "as_of": "2026-08-05" }, { "value": "High-pressure steam boilers: One annual external inspection; One annual internal inspection. High-pressure, high-temperature hot-water boilers: One annual external inspection; One internal inspection triennially (annually if equipped with manholes and handholes).", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure steam boilers: One annual external inspection; One annual internal inspection. High-pressure, high-temperature hot-water boilers: One annual external inspection; One internal inspection triennially. If equipped with manholes and handholes, an annual inspection is required. Such boilers shall be inspected externally annually approximately six months after each internal inspection. Low-pressure steam boilers: External inspection annually; One internal inspection triennially. Low-pressure, hot-water boilers: External inspection annually; One internal inspection quinquennially (every five years). New boilers shall be hydrostatically tested upon installation and prior to service. Boilers shall be tested to 60 psi or 1-1/2 times the design pressure, whichever is greater.", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "annual external inspections and triennial internal inspections (steam); annual external inspections and internal inspections every five years (hot-water)", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The New York City Department of Buildings administers inspections under New York State Industrial Code Rules 4 and 14. Authorized inspector types: Department inspectors conduct all first inspections. For subsequent inspections, New York City accepts commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections. Inspection frequency: High-pressure steam boilers require annual internal and external inspections. High-pressure hot-water boilers require annual external inspections and triennial internal inspections. Low-pressure steam boilers require annual external inspections and triennial internal inspections, while low-pressure hot-water boilers require annual external inspections and internal inspections every five years.", "as_of": "2026-08-05" }, { "value": "Low-pressure steam boilers: External inspection annually; One internal inspection triennially. Low-pressure, hot-water boilers: External inspection annually; One internal inspection quinquennially (every five years).", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure steam boilers: One annual external inspection; One annual internal inspection. High-pressure, high-temperature hot-water boilers: One annual external inspection; One internal inspection triennially. If equipped with manholes and handholes, an annual inspection is required. Such boilers shall be inspected externally annually approximately six months after each internal inspection. Low-pressure steam boilers: External inspection annually; One internal inspection triennially. Low-pressure, hot-water boilers: External inspection annually; One internal inspection quinquennially (every five years). New boilers shall be hydrostatically tested upon installation and prior to service. Boilers shall be tested to 60 psi or 1-1/2 times the design pressure, whichever is greater.", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "Department inspectors conduct all first inspections. For subsequent inspections, commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The New York City Department of Buildings administers inspections under New York State Industrial Code Rules 4 and 14. Authorized inspector types: Department inspectors conduct all first inspections. For subsequent inspections, New York City accepts commissioned insurance inspectors. Local Law 62/91 also permits NYC-licensed master plumbers, oil burner installers, and high-pressure boiler operators to conduct annual low-pressure inspections. Inspection frequency: High-pressure steam boilers require annual internal and external inspections. High-pressure hot-water boilers require annual external inspections and triennial internal inspections. Low-pressure steam boilers require annual external inspections and triennial internal inspections, while low-pressure hot-water boilers require annual external inspections and internal inspections every five years.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure steam boilers: One annual external inspection; One annual internal inspection. High-pressure, high-temperature hot-water boilers: One annual external inspection; One internal inspection triennially. If equipped with manholes and handholes, an annual inspection is required. Such boilers shall be inspected externally annually approximately six months after each internal inspection. Low-pressure steam boilers: External inspection annually; One internal inspection triennially. Low-pressure, hot-water boilers: External inspection annually; One internal inspection quinquennially (every five years). New boilers shall be hydrostatically tested upon installation and prior to service. Boilers shall be tested to 60 psi or 1-1/2 times the design pressure, whichever is greater.", "as_of": "2026-08-05" } ] } ] }, { "state": "North Carolina", "governing_body": "Department of Labor, Boiler Safety Bureau", "statute_citation": "North Carolina General Statutes, Chapter 95, Article 7A, and North Carolina Administrative Code, Title 13, Chapter 13.", "power_boiler_interval": "High-pressure boilers: Internal 1 Year, External 1 Year.", "low_pressure_boiler_interval": "Low-pressure boilers and pressure vessels: External 2 Years.", "pressure_vessel_interval": "Low-pressure boilers and pressure vessels: External 2 Years. Hydropneumatic storage tanks: External 4 Years.", "accepted_inspectors": "Inspections made by \"Special\" inspectors employed by insurance companies and commissioned by the Commissioner are accepted in lieu of inspections made by a State deputy inspector.", "exemptions": "Boilers and pressure vessels owned and/or operated by the federal government. Boilers and pressure vessels which are located in private residences or in apartment houses of fewer than six families. Pressure vessels operating at a working pressure not exceeding 15 psig.", "id": "north-carolina", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/north-carolina/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "North Carolina General Statutes, Chapter 95, Article 7A, and North Carolina Administrative Code, Title 13, Chapter 13. RULES FOR CODES AND STAMPING Codes:", "verified_fields": [ "state", "statute_citation" ] }, { "state": "North Dakota", "governing_body": "North Dakota Department of Environmental Quality, Boiler Inspection Program", "statute_citation": "North Dakota Statutes, Title 23.1. Environmental Quality, Chapter 23.1-16. Boiler Inspection, Sections 1 through 14.", "power_boiler_interval": "High-pressure boilers: Internal 1 Year, External 1 Year (while under pressure).", "low_pressure_boiler_interval": "Low-pressure steam boilers, steel: Internal 2 Years, External 2 Years. Low-pressure steam boilers, cast-iron: External 1 Year. Hot-water heating and hot-water supply boilers: External 3 Years (one annual external inspection for those located in hospitals, nursing homes, schools, nursery schools, and kindergartens).", "pressure_vessel_interval": "Field inspection of pressure vessels (other than anhydrous ammonia pressure vessels) is not required.", "accepted_inspectors": "Inspections made by inspectors employed by National Board approved Authorized Inspection Agencies and commissioned by the department are accepted. Inspections made by inspectors employed by owners/users and commissioned by the department are accepted.", "exemptions": "Boilers and pressure vessels subject to federal inspection or under federal control. Boilers and pressure vessels located on farms and used solely for agricultural purposes. Heating boilers which are located in private residences or in apartment houses of fewer than six family units. Miniature hobby boilers not exceeding an inside diameter of 10 inches and a grate area not exceeding 1-1/2 square feet.", "id": "north-dakota", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/north-dakota/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Item | Internal | External | High-pressure boilers | 1 Year | 1 Year* | Low-pressure steam boilers, steel | 2 Years | 2 Years | Low-pressure steam boilers, cast-iron | — | 1 Year | Hot-water heating and hot-water supply boilers | — | 3 Years** | *External inspection while under pressure. **One annual external inspection for those located in hospitals, nursing homes, schools, nursery schools, and kindergartens.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval" ] }, { "state": "Ohio", "governing_body": "Ohio Department of Commerce's Division of Industrial Compliance", "statute_citation": "Ohio Revised Code, Title 41, Chapter 4104", "power_boiler_interval": "annual internal and external inspections while operating", "low_pressure_boiler_interval": "triennial internal inspections and annual external inspections under operating conditions", "accepted_inspectors": "commissioned inspectors from authorized insurance companies", "id": "ohio", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/ohio/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Ohio Ohio’s inspection framework: Governing body: The Ohio Department of Commerce’s Division of Industrial Compliance oversees boiler inspections under Ohio Revised Code, Title 41, Chapter 4104. Authorized inspector types: Ohio accepts commissioned inspectors from authorized insurance companies. Inspection frequency: High-pressure boilers require annual internal and external inspections while operating. Low-pressure boilers require triennial internal inspections and annual external inspections under operating conditions.", "verified_fields": [ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "Unfired pressure vessels are exempt from field inspection.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Portable boilers or unfired pressure vessels located on farms and used solely for agricultural purposes. Steam or vapor boilers carrying a pressure of not more than 15 psig, located in private residences or in apartment houses of fewer than six family units. Hot-water boilers operated at temperatures not exceeding 250\u00b0F, located in private residences or in apartment houses of fewer than six family units. Unfired pressure vessels.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Ohio Department of Commerce's Division of Industrial Compliance", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Ohio Ohio’s inspection framework: Governing body: The Ohio Department of Commerce’s Division of Industrial Compliance oversees boiler inspections under Ohio Revised Code, Title 41, Chapter 4104. Authorized inspector types: Ohio accepts commissioned inspectors from authorized insurance companies. Inspection frequency: High-pressure boilers require annual internal and external inspections while operating. Low-pressure boilers require triennial internal inspections and annual external inspections under operating conditions.", "as_of": "2026-08-05" }, { "value": "Ohio Department of Commerce, Division of Industrial Compliance \u2013 Boilers", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Ohio Revised Code, Title 41, Chapter 4104", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Ohio Ohio’s inspection framework: Governing body: The Ohio Department of Commerce’s Division of Industrial Compliance oversees boiler inspections under Ohio Revised Code, Title 41, Chapter 4104. Authorized inspector types: Ohio accepts commissioned inspectors from authorized insurance companies. Inspection frequency: High-pressure boilers require annual internal and external inspections while operating. Low-pressure boilers require triennial internal inspections and annual external inspections under operating conditions.", "as_of": "2026-08-05" }, { "value": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections while operating", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Ohio Ohio’s inspection framework: Governing body: The Ohio Department of Commerce’s Division of Industrial Compliance oversees boiler inspections under Ohio Revised Code, Title 41, Chapter 4104. Authorized inspector types: Ohio accepts commissioned inspectors from authorized insurance companies. Inspection frequency: High-pressure boilers require annual internal and external inspections while operating. Low-pressure boilers require triennial internal inspections and annual external inspections under operating conditions.", "as_of": "2026-08-05" }, { "value": "Power boilers and high-pressure, high-temperature water boilers: Internal 1 Year, External 1 Year (under operating conditions).", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "triennial internal inspections and annual external inspections under operating conditions", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Ohio Ohio’s inspection framework: Governing body: The Ohio Department of Commerce’s Division of Industrial Compliance oversees boiler inspections under Ohio Revised Code, Title 41, Chapter 4104. Authorized inspector types: Ohio accepts commissioned inspectors from authorized insurance companies. Inspection frequency: High-pressure boilers require annual internal and external inspections while operating. Low-pressure boilers require triennial internal inspections and annual external inspections under operating conditions.", "as_of": "2026-08-05" }, { "value": "Low-pressure boilers: Internal 3 Years, External 1 Year (under operating conditions).", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "commissioned inspectors from authorized insurance companies", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Ohio Ohio’s inspection framework: Governing body: The Ohio Department of Commerce’s Division of Industrial Compliance oversees boiler inspections under Ohio Revised Code, Title 41, Chapter 4104. Authorized inspector types: Ohio accepts commissioned inspectors from authorized insurance companies. Inspection frequency: High-pressure boilers require annual internal and external inspections while operating. Low-pressure boilers require triennial internal inspections and annual external inspections under operating conditions.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors of authorized insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] } ] }, { "state": "Oklahoma", "governing_body": "Department of Labor, Safety Standards Division", "statute_citation": "Oklahoma State Statutes, Title 40. Labor, Oklahoma Boiler and Pressure Vessel Law, Sections 141.0 through 141.20 and Administrative Rules 380:25.", "power_boiler_interval": "Power boilers and high-temperature, high-pressure boilers: Internal 1 Year, External 1 Year (under pressure).", "low_pressure_boiler_interval": "Low-pressure steam and vapor heating boilers: Internal 2 Years, External 1 Year. Hot-water heating and hot-water supply boilers: Internal at the discretion of the inspector, External 1 Year.", "pressure_vessel_interval": "Pressure vessels subject to internal corrosion: Internal 3 Years, External 3 Years. Pressure vessels not subject to internal corrosion: Internal 10 Years, External 3 Years.", "accepted_inspectors": "Inspections made by insurance company inspectors may be accepted in lieu of inspections made by a department inspector, provided a photostatic copy of the inspector's National Board Certificate is furnished to the department and the inspector is authorized by the commissioner of labor.", "exemptions": "Pressure vessels not exceeding 15 cubic feet in volume and 250 psig. Low-pressure steam boilers, hot-water heating boilers, hot-water supply boilers, hot-water supply heaters, or pressure vessels located in private residences or in apartment houses of fewer than six family units. Pressure vessels on remote sites limited to oil- and natural gas-gathering facilities, processing plants or gas-producing lease locations.", "id": "oklahoma", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/oklahoma/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Item | Internal | External | Power boilers and high-temperature, high-pressure boilers | 1 Year | 1 Year* | Low-pressure steam and vapor heating boilers | 2 Years | 1 Year | Hot-water heating and hot-water supply boilers | ** | 1 Year | Hot-water supply heaters | *** | 2 Years | Pressure vessels, excluding those within the scope of API Inspection Code, subject to internal corrosion, and waste heat team generators | 3 Years | 3 Years | Pressure vessels not subject to internal corrosion | 10 Years | 3 Years | *Under pressure. **At the discretion of the inspector. ***Only those located in public facilities. Vessels within the scope of the API Inspection Code shall be inspected as prescribed therein. Downstream welded steam piping exceeding 15 psi requires inspection.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ] }, { "state": "Oregon", "governing_body": "Department of Consumer and Business Services, Building Codes Division, Boiler and Pressure Vessel Group", "statute_citation": "Oregon Revised Statutes, Volume 11, Title 38. Protection from Fire, Chapter 480. Explosives, Flammable Materials, Pressure Vessels, Sections 510 through 990.", "power_boiler_interval": "Power Boilers: Internal 1 Year, External 1 Year.", "low_pressure_boiler_interval": "Low-pressure steam and vapor-heating boilers: Internal 2 Years, External 2 Years. Cast-iron boilers: External 2 Years. Low-pressure hot-water heating and hot-water supply boilers: Internal 6 Years, External 2 Years.", "pressure_vessel_interval": "Pressure vessels subject to internal corrosion: Internal 2 Years, External 2 Years. Pressure vessels not subject to internal corrosion: External 2 Years. Pressure vessels containing anhydrous ammonia intended for use as a fertilizer: External 3 Years.", "accepted_inspectors": "Inspections made by special boiler inspectors holding a valid Oregon Certificate of Competency from the Building Codes Division and continuously employed by insurance companies authorized to write boiler and machinery insurance in the state are accepted in lieu of inspections made by a deputy boiler inspector.", "exemptions": "Boilers and pressure vessels under federal control. Domestic water heaters not exceeding 120 gallons, 210\u00b0F, 150 psig, and 200,000 BTU per hour. Boilers operated at less than 15 psig located on farms and used solely for agricultural purposes. Boilers or pressure vessels used in a single private residence (exempt from subsequent inspections after installation). Pressure vessels operated at less than 15 psig.", "id": "oregon", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/oregon/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by special boiler inspectors holding a valid Oregon Certificate of Competency from the Building Codes Division and continuously employed by insurance companies authorized to write boiler and machinery insurance in the state are accepted in lieu of inspections made by a deputy boiler inspector.", "verified_fields": [ "accepted_inspectors", "state" ] }, { "state": "Pennsylvania", "governing_body": "Department of Labor and Industry's Boiler Division", "statute_citation": "Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17", "power_boiler_interval": "annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met", "low_pressure_boiler_interval": "biennial internal or external inspections", "accepted_inspectors": "commissioned inspectors from authorized insurance companies and registered owner inspection agencies", "id": "pennsylvania", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/pennsylvania/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.", "verified_fields": [ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "Unfired pressure vessels: 3 Years.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Boilers and pressure vessels owned or operated by the federal government. Boilers located on farms, except in sales areas which are accessible to the public. Boilers located in single-family dwellings or multi-unit dwellings with four or fewer units. Storage water heaters and instantaneous water heaters if heat input does not exceed 200,000 BTU/HR, water temperature does not exceed 210\u00b0F, and nominal water-containing capacity does not exceed 120 gallons.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Department of Labor and Industry's Boiler Division", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.", "as_of": "2026-08-05" }, { "value": "Department of Labor and Industry, Boiler Division", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.", "as_of": "2026-08-05" }, { "value": "The Pennsylvania Code, No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.", "as_of": "2026-08-05" }, { "value": "Power boilers, internal and external: 1 Year. (May be extended to 24 months under certain conditions.)", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "biennial internal or external inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.", "as_of": "2026-08-05" }, { "value": "Low-pressure steam vapor, hot-water heating and hot-water supply boilers: 2 Years.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "commissioned inspectors from authorized insurance companies and registered owner inspection agencies", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.", "as_of": "2026-08-05" } ] } ] }, { "state": "Puerto Rico", "governing_body": "Commonwealth of Puerto Rico, Department of Labor and Human Resources, P.R. Occupational Safety and Health Administration (PR OSHA), Boiler and Elevator Division", "statute_citation": "Regulation Number 17 of the Office of the Assistant Secretary for Occupational Safety & Health, Regulation of Boilers and Pressure Vessels", "power_boiler_interval": "One annual internal; One annual external and operational.", "low_pressure_boiler_interval": "One annual internal; One annual external and operational.", "pressure_vessel_interval": "One annual internal; One annual external and operational.", "accepted_inspectors": "Inspections are made by private inspectors and inspectors employed by insurance companies authorized by the Secretary of Labor and Human Resources. (Department of Labor and Human Resources does not make inspections).", "exemptions": "All boilers and pressure vessels, except definitions and exemptions as established by ASME Code.", "id": "puerto-rico", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/puerto-rico/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Boilers and Pressure Vessels: One annual internal; One annual external and operational.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ] }, { "state": "Rhode Island", "governing_body": "Department of Labor and Training, Division of Occupational Safety", "statute_citation": "Rhode Island General Law, Title 28. Labor and Labor Relations, Chapter 25. Boiler Inspections and Pressure Vessels, Sections 1 through 23. Rhode Island Rule 260-RICR-30-10-2.", "power_boiler_interval": "Power boilers and high-pressure, high temperature water boilers shall receive an inspection annually which shall be an internal inspection where construction permits; otherwise, it shall be as complete an inspection as possible. Such boilers shall also be inspected externally annually while under normal operating conditions.", "low_pressure_boiler_interval": "Low pressure boilers, hot water heaters, and hot water storage tanks shall receive an inspection biennially. Steam or vapor boilers shall have an external inspection biennially and may have an internal inspection, if deemed necessary, at the discretion of the inspector. Hot water heating and hot water supply boilers shall have an external inspection biennially and where construction permits, an internal inspection at the discretion of the inspector.", "pressure_vessel_interval": "Unfired pressure vessels shall receive an inspection triennially. This inspection shall be internal where construction permits. Pressure vessels not subject to internal corrosion shall be inspected externally.", "accepted_inspectors": "An authorized inspector means an Inspector employed by the State of Rhode Island or an Authorized Insurance Company holding a National Board Inservice Commission, and who is regularly employed by the State or an Insurance Company authorized to insure against loss from explosion of boilers or pressure vessels in this State.", "exemptions": "Water heaters and water storage tanks where heat input does not exceed 200,000 BTU/Hr, water temperature does not exceed 210 degrees Fahrenheit, and nominal water capacity does not exceed 120 gallons. Continuous coil type hot water boilers used only for \"steam vapor\" cleaning when nominal water containing capacity does not exceed six (6) gallons and water temperature does not exceed 350 degrees Fahrenheit.", "id": "rhode-island", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/rhode-island/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high temperature water boilers shall receive an inspection annually which shall be an internal inspection where construction permits; otherwise, it shall be as complete an inspection as possible. Such boilers shall also be inspected externally annually while under normal operating conditions. Low pressure boilers, hot water heaters, and hot water storage tanks shall receive an inspection biennially. . Steam or vapor boilers shall have an external inspection biennially and may have an internal inspection, if deemed necessary, at the discretion of the inspector and shall include the function of all controls and safety devices. Hot water heating and hot water supply boilers shall have an external inspection biennially and where construction permits, an internal inspection at the discretion of the inspector. Water Heater boilers including hot water storage tanks shall have an external inspection biennially and shall include the function of all controls and devices. Except as provided for in SS 2.5.2(D) and (E) of this Part, unfired pressure vessels shall receive an inspection triennially. This inspection shall be internal where construction permits. Pressure vessels not subject to internal corrosion shall be inspected externally.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ] }, { "state": "South Carolina", "governing_body": "S.C. Department of Labor, Licensing, and Regulation, Boiler Safety Program", "statute_citation": "South Carolina Code of Laws, Title 41. Labor and Employment, Chapter 14. Boiler Safety Act , Sections 41-14-10 through 41-14-150.", "power_boiler_interval": "annually", "low_pressure_boiler_interval": "biennially", "exemptions": "Boilers located on farms used solely for agricultural or horticultural purposes; Heating boilers located in private residences or in apartment houses of less than six family units", "id": "south-carolina", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/south-carolina/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-pressure, high-temperature water boilers: annually. Inspection must be internal; however, if internal inspection is not possible, the inspection must be as complete as possible. Boilers must be externally inspected while under pressure, if possible. Internal inspection must be done within six months. Low-pressure steam or vapor heating boilers: biennially. An internal inspection must be conducted every four years where installation permits. Hot-water heating and hot-water supply boilers: biennially. An internal inspection must be conducted at the discretion of the inspector.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval" ] }, { "state": "South Dakota", "governing_body": "State Fire Marshal's Office", "statute_citation": "South Dakota Codified Laws, Title 34. Public Safety and Health, Chapter 29A. Boiler Safety , Sections 1 through 55.", "power_boiler_interval": "1 Year internal; 1 Year external", "low_pressure_boiler_interval": "2 Years internal; 2 Years external", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.", "exemptions": "Boilers under federal jurisdiction; Boilers located on farms (if farm is not regularly open to general public and boiler is used solely for agricultural or horticultural purposes); Heating boilers located in private residences or in apartment houses of fewer than six family units; Boilers located in a refinery; Boilers used as part of an electricity generating plant; Historic power boilers", "id": "south-dakota", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/south-dakota/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Lorimor, Chief Boiler Inspector State Fire Marshal's Office 221 South Central Avenue Pierre, SD 57501 Telephone — 605.773.3562 EMPOWERMENT State senate and house of representatives empowered to make, alter, and amend rules and regulations. Boiler Board: No. DATE OF LAW PASSAGE: 1973 Date of latest amendment to law: July 2003. Date rules and regulations implemented: 1973. Date of latest rules and regulations: October 2003. State statute: South Dakota Codified Laws, Title 34. Public Safety and Health, Chapter 29A. Boiler Safety , Sections 1 through 55. RULES FOR CONSTRUCTION AND STAMPING Construction:", "verified_fields": [ "governing_body", "state", "statute_citation" ] }, { "state": "Tennessee", "governing_body": "Department of Labor and Workforce Development's Boiler Inspection Unit", "statute_citation": "Tennessee Code Annotated, Title 68, Chapter 122", "power_boiler_interval": "annual internal and external inspections, with external inspections conducted while under pressure", "low_pressure_boiler_interval": "biennial internal and external inspections", "accepted_inspectors": "Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, commissioned insurance and owner company inspectors", "id": "tennessee", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/tennessee/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Workforce Development’s Boiler Inspection Unit oversees inspections under Tennessee Code Annotated, Title 68, Chapter 122. Authorized inspector types: Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, Tennessee accepts commissioned insurance and owner company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted while under pressure. Low-pressure boilers require biennial internal and external inspections.", "verified_fields": [ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "2 Years internal; 2 Years external (subject to corrosion); certificate inspection every two years for others", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair . RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Boilers located on farms used solely for agricultural purposes; Boilers and pressure vessels located in municipalities where boiler inspection ordinances are in force; Steam boilers used for heating purposes carrying a pressure of not more than 15 psi, located in private residences or in apartment houses of fewer than six families; Hot-water heating boilers carrying a pressure of not more than 30 psi, located in private residences or in apartment houses of fewer than six families", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair . RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Department of Labor and Workforce Development's Boiler Inspection Unit", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Workforce Development’s Boiler Inspection Unit oversees inspections under Tennessee Code Annotated, Title 68, Chapter 122. Authorized inspector types: Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, Tennessee accepts commissioned insurance and owner company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted while under pressure. Low-pressure boilers require biennial internal and external inspections.", "as_of": "2026-08-05" }, { "value": "Department of Labor and Workforce Development, Boiler Inspection Unit", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair . RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Tennessee Code Annotated, Title 68, Chapter 122", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Workforce Development’s Boiler Inspection Unit oversees inspections under Tennessee Code Annotated, Title 68, Chapter 122. Authorized inspector types: Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, Tennessee accepts commissioned insurance and owner company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted while under pressure. Low-pressure boilers require biennial internal and external inspections.", "as_of": "2026-08-05" }, { "value": "Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair .", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair . RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections, with external inspections conducted while under pressure", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Workforce Development’s Boiler Inspection Unit oversees inspections under Tennessee Code Annotated, Title 68, Chapter 122. Authorized inspector types: Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, Tennessee accepts commissioned insurance and owner company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted while under pressure. Low-pressure boilers require biennial internal and external inspections.", "as_of": "2026-08-05" }, { "value": "1 Year internal; 1 Year external", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair . RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "biennial internal and external inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Workforce Development’s Boiler Inspection Unit oversees inspections under Tennessee Code Annotated, Title 68, Chapter 122. Authorized inspector types: Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, Tennessee accepts commissioned insurance and owner company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted while under pressure. Low-pressure boilers require biennial internal and external inspections.", "as_of": "2026-08-05" }, { "value": "2 Years internal; 2 Years external", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair . RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, commissioned insurance and owner company inspectors", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Department of Labor and Workforce Development’s Boiler Inspection Unit oversees inspections under Tennessee Code Annotated, Title 68, Chapter 122. Authorized inspector types: Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, Tennessee accepts commissioned insurance and owner company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted while under pressure. Low-pressure boilers require biennial internal and external inspections.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors employed by insurance and owner/user companies and commissioned by the department are accepted in lieu of inspections made by department inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair . RULES FOR CONSTRUCTION AND STAMPING Construction:", "as_of": "2026-08-05" } ] } ] }, { "state": "Texas", "governing_body": "Texas Department of Licensing and Regulation (TDLR), Compliance Division/Boiler Program", "statute_citation": "Boiler Law, Texas Health and Safety Code, Chapter 755. Administrative Rules, 16 Texas Administrative Code, Chapter 65.", "power_boiler_interval": "annual certificate inspection and an annual external inspection", "low_pressure_boiler_interval": "certificate inspection biennially", "accepted_inspectors": "Inspections of boilers made by authorized inspectors employed by accredited authorized inspection agencies and commissioned by the department are required in lieu of inspections made by a deputy boiler inspector.", "exemptions": "boilers owned or operated by the federal government; manually fired miniature boilers constructed or maintained for locomotives, boats, tractors, or stationary engines only as a hobby; boilers designed for operation only at atmospheric pressure; steam cookers; Heating boilers used to heat buildings exclusively for residential use and having accommodations for not more than four families", "id": "texas", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/texas/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers, unfired steam boilers, and steam collection or liberation drums of process steam generators must receive an annual certificate inspection and an annual external inspection. Steam-heating boilers and hot-water heating boilers must receive a certificate inspection biennially. Hot-water supply boilers and potable water heaters must receive a certificate inspection triennially.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval" ] }, { "state": "Utah", "governing_body": "Utah Labor Commission, Division of Boiler, Elevator, and Coal Mine Safety", "statute_citation": "Utah Condensed Constitution, Title 34A. Utah Labor Code, Chapter 7. Safety , Sections 101 through 104.", "power_boiler_interval": "Annual certificate inspection; Annual external inspection while under operating conditions", "low_pressure_boiler_interval": "biennial certificate inspection", "pressure_vessel_interval": "High-pressure heat exchangers: biennial certificate inspection; All others: quadrennial certificate inspection", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies holding a Utah Certificate of Competency are accepted in lieu of inspections by division inspectors.", "exemptions": "Those boilers or pressure vessels under federal control; Boilers and pressure vessels located in private residences or in apartment houses with fewer than five family units; Hot-water supply boilers directly fired with oil, gas, or electricity when heat input does not exceed 200,000 BTU per hour, water temperature 210\u00b0F, water-containing capacity 120 gallons", "id": "utah", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/utah/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High-pressure heat exchangers: biennial certificate inspection; All others: quadrennial certificate inspection. Upon application from the owner/user (with a recommendation by the state boiler inspector or special inspector), the Labor Commission may authorize extension of the inspection period. Extension shall be granted in writing by the safety director with original and one copy going to the boiler operator and a second copy going to the authorized inspector. When the commission grants an extension, a new certificate (to be properly posted) will be issued to replace the original shorter-term certificate. The old certificate shall be destroyed. Owner/user pressure vessels shall be inspected in accordance with ANSI/API-510 when such owner/user organizations are approved by the commission. INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors employed by insurance companies holding a Utah Certificate of Competency are accepted in lieu of inspections by division inspectors. Reports of certificate inspection must be filed with the division on approved forms within 30 days.", "verified_fields": [ "accepted_inspectors", "low_pressure_boiler_interval", "pressure_vessel_interval", "state" ] }, { "state": "Vermont", "governing_body": "Department of Public Safety, Division of Fire Safety", "statute_citation": "Vermont Statutes Annotated, Title 20 VSA, Chapter 173, Subchapter 5, Vermont Fire & Building Safety Code - 2015.", "power_boiler_interval": "Annual internal and external inspection while not under pressure; External inspection, while in operation and under pressure, approximately six months from the internal inspection", "low_pressure_boiler_interval": "2 year external inspection; 2 year internal inspection, where construction permits", "pressure_vessel_interval": "3 year external inspection; 3 year internal inspection, where construction permits", "accepted_inspectors": "Inspections made by inspectors with a National Board commission and commissioned by the department are required.", "exemptions": "Boilers or pressure vessels located on common carriers subject to Surface Transportation Board, US Department of Transportation, Federal Railroad Administration, or Nuclear Regulatory Commission; Hot-water heaters and potable water storage tanks with heat input of less than 200,000 BTU per hour, water temperature less than 210\u00b0F, water-containing capacity less than 120 gallons", "id": "vermont", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/vermont/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "High pressure power boilers (more than 15 psi) and high temperature water boilers: Annual internal and external inspection while not under pressure; External inspection, while in operation and under pressure, approximately six months from the internal inspection. Low-pressure hot water heating boilers (not exceeding 160 psi and/or temperatures not exceeding 250 degrees) and low-pressure steam boilers (not exceeding 15 psi): 2 year external inspection; 2 year internal inspection, where construction permits, for steam heating boiler (not exceeding 15 psi).", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval" ] }, { "state": "Virginia", "governing_body": "Department of Labor and Industry, Boiler and Pressure Vessel Safety Division", "statute_citation": "Code of Virginia, Title 40. Labor and Employment, Chapter 3.1. Boiler and Pressure Vessel Safety Act , Sections 40.1.51.5 through 40.1.51.19.5. and Virginia Administrative Code, Title 16. Labor and Employment, Agency 25. Safety and Health Codes Board, Chapter 40, Standards for Boiler and Pressure Vessel Certification , Sections 10 through 70 and Chapter 55, Financial Requirements for Boiler and Pressure Vessel Contract Fee Inspectors , Sections 10 through 20.", "power_boiler_interval": "Certificate inspection annually; External inspection annually while under operating conditions, if possible", "low_pressure_boiler_interval": "Certificate inspection biennially", "pressure_vessel_interval": "Certificate inspection biennially", "accepted_inspectors": "Reports of inspection made by authorized insurance company inspectors or contract-fee inspectors shall be filed with the chief inspector on National Board forms within 30 days. Such inspections are acceptable in lieu of state inspections.", "exemptions": "Boilers or unfired pressure vessels owned or operated by the federal government or any agency thereof; Boilers or fired or unfired pressure vessels used in or on the property of private residences or apartment houses of less than four apartments; Hobby or model boilers; Hot water supply boilers, water heaters, and unfired pressure vessels used as hot water supply storage tanks when heat input does not exceed 200,000 BTU per hour, water temperature 210\u00b0F, water-containing capacity 120 gallons", "id": "virginia", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/virginia/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Power boilers and high-temperature water boilers: Certificate inspection annually; External inspection annually while under operating conditions, if possible. Heating boilers: Certificate inspection biennially: Steam boilers: An internal inspection where construction permits; Water boilers: An external inspection with internal inspection at discretion of the inspector, where construction permits. Pressure vessels subject to internal corrosion: certificate inspection biennially with internal inspection at discretion of inspector, where construction permits.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ] }, { "state": "Washington", "governing_body": "Department of Labor and Industries, Field Services & Public Safety Division (FS & PS), Boiler Program", "statute_citation": "Chapter 296-104 WAC and Chapter 70.79 RCW.", "power_boiler_interval": "1 Year internal; 1 Year external", "low_pressure_boiler_interval": "2 Years internal; 2 Years external", "pressure_vessel_interval": "2 Years internal (when subject to corrosion); 2 Years external", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections by a department inspector.", "exemptions": "Boilers and pressure vessels under federal regulation or operated by any railroad; Boilers and pressure vessels located on farms and used solely for agricultural purposes; Steam boilers used exclusively for heating purposes carrying a pressure of not more than 15 psig and which are located in private residences or in apartment houses of fewer than six families; Hot-water heating boilers with a pressure of not more than 30 psi located in private residences or apartment houses of fewer than six families; Boilers and pressure vessels in cities having ordinances which are enforced and which have requirements equal to or higher than those provided for under this chapter", "id": "washington", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/washington/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Chapter 296-104 WAC and Chapter 70.79 RCW. RULES FOR CONSTRUCTION AND STAMPING Construction: ASME Code (Current). (Sections I, III, IV, VIII, Div. 1,2,3, X, XII, XIII). ASME CSD-1, Part CF (Current) and other jurisdictional accepted national and and international standards. Code case interpretations when accepted by the chief inspector. Standards of construction approved by the chief inspector and meeting the National Board criteria for registration of boilers, pressure vessels and other pressure-retaining items. ASME PVHO-1 (Current). Manufacturer’s Data Reports for new standard boilers and unfired pressure vessels shall be registered with the National Board. Inspection: National Board Inspection Code (Current), Part 1, Installation , Part 2, Inspection , Part 3, Repairs and Alterations , and Part 4, Pressure Relief Devices . The standard for inspection of nuclear items is ASME Section XI, current edition. National Board Certified Owner/User Organizations may choose to use API-510, current edition. Pulp and paper manufacturers may use TAPPI TIP 0402-16, 2011 edition, when requested and approved by the chief inspector. The following rule changes became effective in Washington State July 1, 2025.", "verified_fields": [ "state", "statute_citation" ] }, { "state": "Washington D.C.", "governing_body": "Department of Buildings", "statute_citation": "District of Columbia Code, Division 1, Title 2, Chapter 1, and DCMR Title 17, Chapter 4 and Title 12, Chapter 10E", "power_boiler_interval": "annual internal inspections", "low_pressure_boiler_interval": "annual external inspections (cast-iron boilers)", "accepted_inspectors": "Department inspectors conduct all first inspections regardless of insurance status. For subsequent inspections, commissioned insurance company inspectors", "id": "washington-d-c", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/washington-d-c/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Governing body: The Department of Buildings administers inspections under District of Columbia Code, Division 1, Title 2, Chapter 1, and DCMR Title 17, Chapter 4 and Title 12, Chapter 10E. Authorized inspector types: Department inspectors conduct all first inspections regardless of insurance status. For subsequent inspections, Washington, D.C., accepts commissioned insurance company inspectors. Inspection frequency: High-pressure steam boilers require annual internal inspections. Low-pressure cast-iron boilers require annual external inspections.", "verified_fields": [ "accepted_inspectors", "governing_body", "power_boiler_interval", "statute_citation" ] }, { "state": "Washington, D.C.", "governing_body": "Department of Buildings", "statute_citation": "District of Columbia Code, Division 1. Government of District, Title 2. Government Administration, Chapter 1. Inspections \u2013 Boilers . DCMR Title 17 Chapter 4 (Steam Engineers). DCMR Title 12 Chapter 10E (Boilers, Water Heaters and Pressure Vessels).", "power_boiler_interval": "annual internal inspection", "low_pressure_boiler_interval": "annual external inspection", "pressure_vessel_interval": "annual external inspection", "accepted_inspectors": "Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.", "exemptions": "Those under federal government jurisdiction; Those on boats or floating equipment; Those on railway locomotives; Those under the Public Utilities Commission jurisdiction; Unfired pressure vessels with a capacity of 15 gallons or less, and those constructed for a pressure of 60 psi or less", "id": "washington-d-c-2", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/washington-d-c-2/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Steam boilers: an annual internal inspection. Cast-iron boilers and unfired pressure vessels: an annual external inspection. Portable and other unfired pressure vessels: an annual external inspection.", "verified_fields": [ "low_pressure_boiler_interval", "power_boiler_interval", "pressure_vessel_interval" ] }, { "state": "West Virginia", "governing_body": "Division of Labor's Safety Section", "statute_citation": "West Virginia Code, Chapter 21, Article 3, Section 7", "power_boiler_interval": "annual internal and external inspections", "low_pressure_boiler_interval": "annual internal and external inspections", "accepted_inspectors": "commissioned insurance company inspectors who hold a West Virginia Certificate of Competency", "id": "west-virginia", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/west-virginia/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Division of Labor’s Safety Section oversees steam boiler inspections under West Virginia Code, Chapter 21, Article 3, Section 7. Authorized inspector types: West Virginia accepts commissioned insurance company inspectors who hold a West Virginia Certificate of Competency. Inspection frequency: All covered steam boilers require annual internal and external inspections.", "verified_fields": [ "accepted_inspectors", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "exemptions", "value": "Boilers under the jurisdiction of the federal government; Boilers carrying not more than 15 psi; Railroad locomotive boilers subject to inspection under federal laws; Portable boilers used for agricultural purposes; Boilers on automobiles; Boilers in private residences used solely for residential purposes; Sectional boilers; Small portable boilers used in the oil and gas industry", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSPECTIONS REQUIRED Installation. Annual internal and external. Rental boilers coming into the state for temporary use.", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Division of Labor's Safety Section", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Division of Labor’s Safety Section oversees steam boiler inspections under West Virginia Code, Chapter 21, Article 3, Section 7. Authorized inspector types: West Virginia accepts commissioned insurance company inspectors who hold a West Virginia Certificate of Competency. Inspection frequency: All covered steam boilers require annual internal and external inspections.", "as_of": "2026-08-05" }, { "value": "Division of Labor, Safety Section", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSPECTIONS REQUIRED Installation. Annual internal and external. Rental boilers coming into the state for temporary use.", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "West Virginia Code, Chapter 21, Article 3, Section 7", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Division of Labor’s Safety Section oversees steam boiler inspections under West Virginia Code, Chapter 21, Article 3, Section 7. Authorized inspector types: West Virginia accepts commissioned insurance company inspectors who hold a West Virginia Certificate of Competency. Inspection frequency: All covered steam boilers require annual internal and external inspections.", "as_of": "2026-08-05" }, { "value": "West Virginia Code, Chapter 21. Labor, Article 3. Safety and Welfare of Employees, Section 7. Regulation of Operation of Steam Boilers .", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSPECTIONS REQUIRED Installation. Annual internal and external. Rental boilers coming into the state for temporary use.", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal and external inspections", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Division of Labor’s Safety Section oversees steam boiler inspections under West Virginia Code, Chapter 21, Article 3, Section 7. Authorized inspector types: West Virginia accepts commissioned insurance company inspectors who hold a West Virginia Certificate of Competency. Inspection frequency: All covered steam boilers require annual internal and external inspections.", "as_of": "2026-08-05" }, { "value": "Annual internal and external", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSPECTIONS REQUIRED Installation. Annual internal and external. Rental boilers coming into the state for temporary use.", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "commissioned insurance company inspectors who hold a West Virginia Certificate of Competency", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "The Division of Labor’s Safety Section oversees steam boiler inspections under West Virginia Code, Chapter 21, Article 3, Section 7. Authorized inspector types: West Virginia accepts commissioned insurance company inspectors who hold a West Virginia Certificate of Competency. Inspection frequency: All covered steam boilers require annual internal and external inspections.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors employed by insurance companies and commissioned by the division are accepted in lieu of inspections made by a division inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "INSPECTIONS REQUIRED Installation. Annual internal and external. Rental boilers coming into the state for temporary use.", "as_of": "2026-08-05" } ] } ] }, { "state": "Wisconsin", "governing_body": "Department of Safety and Professional Services' Division of Industry Services", "statute_citation": "Wisconsin Administrative Code, SPS Chapter 341", "power_boiler_interval": "annual internal inspections, with external inspections accepted where internal access is not possible", "low_pressure_boiler_interval": "external or internal inspections every 36 months", "accepted_inspectors": "insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department", "id": "wisconsin", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/wisconsin/", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Division of Industry Services administers inspections under Wisconsin Administrative Code, SPS Chapter 341. Authorized inspector types: Wisconsin accepts insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department. Inspection frequency: High-pressure boilers require annual internal inspections, with external inspections accepted where internal access is not possible. Low-pressure boilers require external or internal inspections every 36 months.", "verified_fields": [ "accepted_inspectors", "governing_body", "low_pressure_boiler_interval", "power_boiler_interval", "state", "statute_citation" ], "also_reported": [ { "field": "pressure_vessel_interval", "value": "one external or internal inspection every 36 months", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal inspection. Where an internal inspection is not possible because of boiler construction, an external inspection will be acceptable. Should operating conditions require longer periods, an extension of time may be granted upon written application to the department with written concurrence of inspection agency. Low-pressure steam and hot-water boilers: one external or internal inspection every 36 months. Pressure vessels: one external or internal inspection every 36 months. Anhydrous ammonia storage and nurse tanks: one inspection every 36 months. Power piping: welder documentation and material inspection prior to start of fabrication (installed to ASME B31.1). INSURANCE INSPECTION REQUIREMENTS The department must be notified of suspension of insurance because of dangerous conditions . The department must be notified of new business or discontinuance of insurance . CERTIFICATE OF INSPECTION Certificate of Inspection is issued by the State of Wisconsin.", "as_of": "2026-08-05" }, { "field": "exemptions", "value": "Boilers or pressure vessels regularly inspected by US government inspectors; Heating boilers located in private residences or in apartment buildings having fewer than three family units; Boilers used exclusively for agricultural purposes; Hot-water supply boilers, water heaters, and hot-water storage tanks in which the temperature does not exceed 210\u00b0F; Installations at one or two family dwellings", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal inspection. Where an internal inspection is not possible because of boiler construction, an external inspection will be acceptable. Should operating conditions require longer periods, an extension of time may be granted upon written application to the department with written concurrence of inspection agency. Low-pressure steam and hot-water boilers: one external or internal inspection every 36 months. Pressure vessels: one external or internal inspection every 36 months. Anhydrous ammonia storage and nurse tanks: one inspection every 36 months. Power piping: welder documentation and material inspection prior to start of fabrication (installed to ASME B31.1). INSURANCE INSPECTION REQUIREMENTS The department must be notified of suspension of insurance because of dangerous conditions . The department must be notified of new business or discontinuance of insurance . CERTIFICATE OF INSPECTION Certificate of Inspection is issued by the State of Wisconsin.", "as_of": "2026-08-05" } ], "disagreements": [ { "field": "governing_body", "versions": [ { "value": "Department of Safety and Professional Services' Division of Industry Services", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Division of Industry Services administers inspections under Wisconsin Administrative Code, SPS Chapter 341. Authorized inspector types: Wisconsin accepts insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department. Inspection frequency: High-pressure boilers require annual internal inspections, with external inspections accepted where internal access is not possible. Low-pressure boilers require external or internal inspections every 36 months.", "as_of": "2026-08-05" }, { "value": "Department of Safety & Professional Services, Division of Industry Services", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal inspection. Where an internal inspection is not possible because of boiler construction, an external inspection will be acceptable. Should operating conditions require longer periods, an extension of time may be granted upon written application to the department with written concurrence of inspection agency. Low-pressure steam and hot-water boilers: one external or internal inspection every 36 months. Pressure vessels: one external or internal inspection every 36 months. Anhydrous ammonia storage and nurse tanks: one inspection every 36 months. Power piping: welder documentation and material inspection prior to start of fabrication (installed to ASME B31.1). INSURANCE INSPECTION REQUIREMENTS The department must be notified of suspension of insurance because of dangerous conditions . The department must be notified of new business or discontinuance of insurance . CERTIFICATE OF INSPECTION Certificate of Inspection is issued by the State of Wisconsin.", "as_of": "2026-08-05" } ] }, { "field": "statute_citation", "versions": [ { "value": "Wisconsin Administrative Code, SPS Chapter 341", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Division of Industry Services administers inspections under Wisconsin Administrative Code, SPS Chapter 341. Authorized inspector types: Wisconsin accepts insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department. Inspection frequency: High-pressure boilers require annual internal inspections, with external inspections accepted where internal access is not possible. Low-pressure boilers require external or internal inspections every 36 months.", "as_of": "2026-08-05" }, { "value": "Pursuant to S.101.17m the Department of Safety & Professional Services, Division of Industry Services, enforces Wisconsin Administrative Code, SPS Chapter 341, Boilers and Pressure Vessels .", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal inspection. Where an internal inspection is not possible because of boiler construction, an external inspection will be acceptable. Should operating conditions require longer periods, an extension of time may be granted upon written application to the department with written concurrence of inspection agency. Low-pressure steam and hot-water boilers: one external or internal inspection every 36 months. Pressure vessels: one external or internal inspection every 36 months. Anhydrous ammonia storage and nurse tanks: one inspection every 36 months. Power piping: welder documentation and material inspection prior to start of fabrication (installed to ASME B31.1). INSURANCE INSPECTION REQUIREMENTS The department must be notified of suspension of insurance because of dangerous conditions . The department must be notified of new business or discontinuance of insurance . CERTIFICATE OF INSPECTION Certificate of Inspection is issued by the State of Wisconsin.", "as_of": "2026-08-05" } ] }, { "field": "power_boiler_interval", "versions": [ { "value": "annual internal inspections, with external inspections accepted where internal access is not possible", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Division of Industry Services administers inspections under Wisconsin Administrative Code, SPS Chapter 341. Authorized inspector types: Wisconsin accepts insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department. Inspection frequency: High-pressure boilers require annual internal inspections, with external inspections accepted where internal access is not possible. Low-pressure boilers require external or internal inspections every 36 months.", "as_of": "2026-08-05" }, { "value": "One annual internal inspection", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal inspection. Where an internal inspection is not possible because of boiler construction, an external inspection will be acceptable. Should operating conditions require longer periods, an extension of time may be granted upon written application to the department with written concurrence of inspection agency. Low-pressure steam and hot-water boilers: one external or internal inspection every 36 months. Pressure vessels: one external or internal inspection every 36 months. Anhydrous ammonia storage and nurse tanks: one inspection every 36 months. Power piping: welder documentation and material inspection prior to start of fabrication (installed to ASME B31.1). INSURANCE INSPECTION REQUIREMENTS The department must be notified of suspension of insurance because of dangerous conditions . The department must be notified of new business or discontinuance of insurance . CERTIFICATE OF INSPECTION Certificate of Inspection is issued by the State of Wisconsin.", "as_of": "2026-08-05" } ] }, { "field": "low_pressure_boiler_interval", "versions": [ { "value": "external or internal inspections every 36 months", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Division of Industry Services administers inspections under Wisconsin Administrative Code, SPS Chapter 341. Authorized inspector types: Wisconsin accepts insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department. Inspection frequency: High-pressure boilers require annual internal inspections, with external inspections accepted where internal access is not possible. Low-pressure boilers require external or internal inspections every 36 months.", "as_of": "2026-08-05" }, { "value": "one external or internal inspection every 36 months", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal inspection. Where an internal inspection is not possible because of boiler construction, an external inspection will be acceptable. Should operating conditions require longer periods, an extension of time may be granted upon written application to the department with written concurrence of inspection agency. Low-pressure steam and hot-water boilers: one external or internal inspection every 36 months. Pressure vessels: one external or internal inspection every 36 months. Anhydrous ammonia storage and nurse tanks: one inspection every 36 months. Power piping: welder documentation and material inspection prior to start of fabrication (installed to ASME B31.1). INSURANCE INSPECTION REQUIREMENTS The department must be notified of suspension of insurance because of dangerous conditions . The department must be notified of new business or discontinuance of insurance . CERTIFICATE OF INSPECTION Certificate of Inspection is issued by the State of Wisconsin.", "as_of": "2026-08-05" } ] }, { "field": "accepted_inspectors", "versions": [ { "value": "insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department", "source": "https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/", "source_quote": "Division of Industry Services administers inspections under Wisconsin Administrative Code, SPS Chapter 341. Authorized inspector types: Wisconsin accepts insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department. Inspection frequency: High-pressure boilers require annual internal inspections, with external inspections accepted where internal access is not possible. Low-pressure boilers require external or internal inspections every 36 months.", "as_of": "2026-08-05" }, { "value": "Inspections made by inspectors employed by insurance companies and holding Certificates of Competency issued by the department are accepted in lieu of inspections made by a department inspector. Inspections made by inspectors employed by owners/users and holding Certificates of Competency issued by the department are accepted in lieu of inspections made by a department inspector.", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "One annual internal inspection. Where an internal inspection is not possible because of boiler construction, an external inspection will be acceptable. Should operating conditions require longer periods, an extension of time may be granted upon written application to the department with written concurrence of inspection agency. Low-pressure steam and hot-water boilers: one external or internal inspection every 36 months. Pressure vessels: one external or internal inspection every 36 months. Anhydrous ammonia storage and nurse tanks: one inspection every 36 months. Power piping: welder documentation and material inspection prior to start of fabrication (installed to ASME B31.1). INSURANCE INSPECTION REQUIREMENTS The department must be notified of suspension of insurance because of dangerous conditions . The department must be notified of new business or discontinuance of insurance . CERTIFICATE OF INSPECTION Certificate of Inspection is issued by the State of Wisconsin.", "as_of": "2026-08-05" } ] } ] }, { "state": "Wyoming", "governing_body": "Department of Workforce Services, Workers\u2019 Safety\u2013OSHA", "id": "wyoming", "url": "https://referencesource.org/boiler-inspection-requirements-by-state/wyoming/", "source": "https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select", "source_quote": "Wyoming state government does not employ boiler or pressure vessel inspectors nor does it have general boiler or pressure vessel rules.", "verified_fields": [ "state" ] } ] }