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'.

Facts extracted from state statutes (government works) and industry reference (National Board Synopsis, freely published). Inspection intervals and exemptions are regulatory facts, not copyrightable.

US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** one annual internal and external inspection

**Low-pressure boiler inspection interval:** one biennial inspection with an internal inspection every four years

**Pressure vessel inspection interval:** one biennial inspection with an internal inspection at the discretion of the inspector

**Accepted inspector types:** 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°F, 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

> 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:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Alabama — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, low_pressure_boiler_interval, power_boiler_interval, pressure_vessel_interval


**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 inspection interval:** certificate inspection annually; external inspection while under pressure, or internal inspection as warranted

**Low-pressure boiler inspection interval:** certificate inspection every two years with an internal inspection every four years if construction permits

**Pressure vessel inspection interval:** inspected internally and externally at intervals set by the Department of Labor and Workforce Development

**Accepted inspector types:** 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°F/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°F, 120 gallons; coil-type boilers below specified limits

> Alaska Statutes Title 18, Chapter 60 Boilers and Unfired Pressure Vessels 18.60.180 RULES FOR CONSTRUCTION AND STAMPING Construction:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Alaska — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, low_pressure_boiler_interval, power_boiler_interval, pressure_vessel_interval


**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 inspection 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 inspection interval:** certificate inspection every two years; internal inspection where construction permits

**Accepted inspector types:** 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°F, 120 gallons

> Arizona Revised Statutes, Title 23. Labor, Article 11. Arizona Boiler Act , Sections 471 through 488. RULES FOR CONSTRUCTION AND STAMPING Construction:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Arizona — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, low_pressure_boiler_interval, power_boiler_interval


**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 inspection interval:** one annual internal inspection; one annual external inspection

**Low-pressure boiler inspection interval:** one internal inspection every three years

**Pressure vessel inspection interval:** every two years

**Accepted inspector types:** 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°F, 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

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Arkansas — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, power_boiler_interval, state, statute_citation


**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 inspection 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 inspection 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 (3–5 years)

**Accepted inspector types:** 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

> 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:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

California — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, power_boiler_interval, pressure_vessel_interval


**State:** Chicago

**Governing body:** The City of Chicago Boiler Bureau

**Statute citation:** Municipal Code of Chicago, Title 4, Chapter 344

**Power boiler inspection interval:** periodic internal and external inspections

**Low-pressure boiler inspection interval:** periodic external inspections and internal inspections at the inspector's discretion

**Accepted inspector types:** city-employed inspectors

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>

Chicago — US boiler and pressure vessel inspection requirements by state


**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 — Industrial and Commercial, Article 4. Buildings and Equipment, Boiler Inspection .

**Power boiler inspection interval:** certificate inspection annually; internal inspection annually (may be extended to triennially with prior approval from the Boiler Division)

**Low-pressure boiler inspection interval:** certificate inspection biennially; external or internal inspection

**Pressure vessel inspection interval:** ASME Code vessels bearing ASME Code stamping considered suitable; non-ASME Code pressure vessel must be certified by the Boiler Inspection Section

**Accepted inspector types:** 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°F; 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°F; hot-water supply storage tanks heated by indirect means not exceeding 200,000 BTU/hr, 210°F, 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

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Colorado — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, low_pressure_boiler_interval, pressure_vessel_interval, state, statute_citation


**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 inspection 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 inspection interval:** external biennially, with an internal at the discretion of the inspector

**Accepted inspector types:** 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°F (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

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Connecticut — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, statute_citation


**State:** Delaware

**Governing body:** Department of Natural Resources and Environmental Control, DNREC, Boiler Safety

**Statute citation:** Delaware Code, Title 7 Conservation Chapter 74B. Department of Natural Resources and Environmental Control, Section 7401B Boiler Safety Program.

**Power boiler inspection interval:** Annual internal inspection; Annual external inspection while under pressure (external inspection should be done within six months of the internal inspection)

**Low-pressure boiler inspection interval:** biennial external inspection

**Pressure vessel inspection interval:** biennial or every four years as determined by the inspector

**Accepted inspector types:** 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)

**Exemptions:** 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°F, 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

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Delaware — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, state, statute_citation


**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 inspection interval:** annual internal and external inspections, with external inspections conducted under pressure within six months of internal inspections

**Low-pressure boiler inspection interval:** biennial external inspections

**Accepted inspector types:** commissioned inspectors holding a National Board Inservice Inspector Commission (IS), commissioned insurance company inspectors, and National Board-369 accredited inspection agencies

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>


**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 inspection interval:** certificate inspection annually; external inspection while under pressure; internal inspection if the construction so permits

**Low-pressure boiler inspection interval:** certificate inspection biennially; internal inspection if the construction so permits

**Accepted inspector types:** 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°F, 120 gallons

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Florida — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** certificate inspection annually, internal inspection where construction permits, plus external inspection while under operating pressure

**Low-pressure boiler inspection interval:** certificate inspection biennially with an internal inspection quadrennially where construction permits

**Pressure vessel inspection 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 inspector types:** 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°F, 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

> 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:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Georgia — US boiler and pressure vessel inspection requirements by state


**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 inspection 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 inspection 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 inspection interval:** biennial external inspection and/or internal inspection where construction permits

**Accepted inspector types:** 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°F, 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

> 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:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Hawaii — US boiler and pressure vessel inspection requirements by state


**State:** Idaho

**Governing body:** Idaho Division of Occupational and Professional Licenses, Industrial Safety Section

**Accepted inspector types:** Insurance company (contact insurance company for regular inspections)

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Idaho — US boiler and pressure vessel inspection requirements by state


**State:** Illinois

**Governing body:** Office of State Fire Marshal, Division of Boiler and Pressure Vessel Safety

**Statute citation:** Illinois Compiled Statutes, Health and Safety, Chapter 430. Public Safety, Subchapter 75. Boiler and Pressure Vessel Safety Act , Sections 1 through 16.

**Power boiler inspection interval:** inspected annually both internally & externally while not under pressure; inspected annually externally while under pressure

**Low-pressure boiler inspection interval:** inspected biennially as required by the rules and regulations of the Board

**Pressure vessel inspection interval:** one triennial certificate inspection (external); internal inspection at the discretion of the inspector where construction permits

**Accepted inspector types:** 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)

**Exemptions:** 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

> 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:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Illinois — US boiler and pressure vessel inspection requirements by 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 inspection interval:** annual internal and external inspections while not under pressure, plus an annual external inspection while under pressure

**Low-pressure boiler inspection interval:** biennial inspections

**Accepted inspector types:** division inspectors, commissioned insurance company inspectors, and commissioned owner inspectors

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>


**State:** Indiana

**Governing body:** Department of Homeland Security, Division of Fire and Building Safety, Boiler and Pressure Vessel Safety

**Statute citation:** Indiana Administrative Code, Title 680. Boiler and Pressure Vessel Rules Board .

**Power boiler inspection interval:** one annual internal and external certificate inspection; one annual external inspection while under pressure, if possible

**Low-pressure boiler inspection interval:** one biennial certificate inspection externally and, where construction permits, internally

**Pressure vessel inspection interval:** 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)

**Accepted inspector types:** 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

**Exemptions:** 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°F; 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

> 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:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Indiana — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, pressure_vessel_interval, statute_citation


**State:** Indiana

**Governing body:** Department of Homeland Security's Division of Fire and Building Safety

**Statute citation:** Indiana Administrative Code, Title 680

**Power boiler inspection interval:** annual internal and external certificate inspections, plus an annual external inspection while under pressure if possible

**Low-pressure boiler inspection interval:** biennial certificate inspections conducted externally and internally, where construction permits

**Accepted inspector types:** State-employed inspectors conduct all first inspections. For ongoing inspections, commissioned insurance inspectors when vessels are insured and commissioned owner inspection agency inspectors

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>


**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 inspector types:** 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.

> INSPECTIONS REQUIRED <http://www.legis.iowa.gov/docs/ico/chapter/89.pdf> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Iowa — US boiler and pressure vessel inspection requirements by 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 inspection 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 inspection 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 inspection 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 inspector types:** 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°F; Nominal water capacity of 120 gallons. Pressure vessels constructed and installed prior to January 1, 1999.

> 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:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Kansas — US boiler and pressure vessel inspection requirements by state


**State:** Kentucky

**Governing body:** Department of Housing, Buildings, and Construction, Boiler & P.V. Inspection, Division of Plumbing

**Statute citation:** Kentucky Revised Statutes, Title XIX. Public Safety and Morals, Chapter 236.00 Boiler and Pressure Vessel Safety Act, Sections .005 through .990.

**Power boiler inspection interval:** Annual internal and external inspection while not under pressure; Annual external inspection while under pressure, if possible.

**Low-pressure boiler inspection interval:** Low-pressure steam or vapor-heating boilers, hot-water heating boilers, and hot-water supply boilers: biennial internal and external inspection where construction permits.

**Accepted inspector types:** 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 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Kentucky — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** annual internal and external inspections while not under pressure, plus annual external inspections while under pressure if possible

**Low-pressure boiler inspection interval:** biennial internal and external inspections, where construction permits, with a two-month grace period allowed

**Accepted inspector types:** Department inspectors conduct all new installation inspections. For ongoing inspections, commissioned insurance company inspectors

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>


**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 inspection 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 inspection 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 – where construction permits — an internal inspection every six years based on date of construction; Potable water boilers/hot-water heaters: An external certificate inspection biennially.

**Accepted inspector types:** 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.

> Louisiana Revised Statutes, Title 23, Chapter 5, Part III, Regulations Affecting Boilers .

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Louisiana — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** One annual internal certificate inspection; One annual external inspection, in operation, approximately six months from the certificate inspection.

**Low-pressure boiler inspection 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 inspection 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 inspector types:** 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Maine — US boiler and pressure vessel inspection requirements by state


**State:** Maryland

**Governing body:** Department of Labor, Licensing, and Regulation, Division of Labor and Industry, Safety Inspections Unit, Boilers and Pressure Vessels

**Statute citation:** Annotated Code of Maryland, Public Safety Article, Title 12, Subtitle 9, Boiler and Pressure Vessel Safety Act.

**Power boiler inspection interval:** Annual internal inspection when construction permits; otherwise, as complete an inspection as possible; Annual external inspection while under pressure, if possible.

**Low-pressure boiler inspection interval:** Low-pressure boilers: a biennial certificate inspection.

**Pressure vessel inspection interval:** Pressure vessels: a biennial certificate inspection.

**Accepted inspector types:** 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.

**Exemptions:** 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°F; 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Maryland — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** annual internal inspections, where construction permits and annual external inspections performed while under pressure

**Low-pressure boiler inspection interval:** biennial certificate inspections

**Accepted inspector types:** commissioned special inspectors from insurance companies. The Commissioner may also commission qualified owner company inspectors upon request

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>


**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 inspection 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 inspection interval:** Hot-water heating and hot-water supply boilers: One inspection annually; One internal inspection every three years where construction permits.

**Pressure vessel inspection interval:** Air tanks: one internal inspection every two years.

**Accepted inspector types:** 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°F 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.

> 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:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Massachusetts — US boiler and pressure vessel inspection requirements by state


**State:** Michigan

**Governing body:** Department of Licensing and Regulatory Affairs, Bureau of Construction Codes, Boiler Division

**Statute citation:** Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947

**Power boiler inspection interval:** 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.

**Low-pressure boiler inspection interval:** 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.

**Accepted inspector types:** 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.

**Exemptions:** 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°F located in private residences or apartment or condo buildings of fewer than six families.

> Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Michigan — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection

**Low-pressure boiler inspection interval:** biennial certificate inspections, with a two-month grace period allowed

**Accepted inspector types:** Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>


**State:** Minnesota

**Governing body:** Minnesota Department of Labor and Industry, Construction Codes and Licensing Division, Boiler Division

**Statute citation:** Minnesota Statutes – 2023, Chapters 326B.93 to 326B.998, Boilers. Minnesota Rules – Chapter 5225.

**Power boiler inspection interval:** Boilers and steam generators: one annual inspection.

**Low-pressure boiler inspection interval:** Boilers and steam generators: one annual inspection.

**Pressure vessel inspection interval:** Unfired pressure vessels: biennial inspection.

**Accepted inspector types:** 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Minnesota — US boiler and pressure vessel inspection requirements by 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 inspection 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 inspection interval:** Heating boilers shall receive a certificate inspection biennially.

**Pressure vessel inspection 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 inspector types:** 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Mississippi — US boiler and pressure vessel inspection requirements by 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 inspection 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 inspection 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 inspection interval:** Pressure vessels shall have an external inspection biennially.

**Accepted inspector types:** 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°F; 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Missouri — US boiler and pressure vessel inspection requirements by state


**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 inspection 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 inspection interval:** All automatically fired boilers rated with an input of less than 400,000 BTU per hour: biennial inspection.

**Accepted inspector types:** 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°F when in private residences, or apartments of six or fewer families.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Montana — US boiler and pressure vessel inspection requirements by state


**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 inspection 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 inspection 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 inspection 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 inspector types:** 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°F output. Unfired pressure vessels not exceeding 5 cubic feet in volume or a pressure of 250 psi.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Nebraska — US boiler and pressure vessel inspection requirements by state

exemptions, governing_body, low_pressure_boiler_interval, power_boiler_interval, pressure_vessel_interval, statute_citation


**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 inspection interval:** One annual internal inspection; One annual external inspection at approximately a six-month interval from the internal inspection.

**Low-pressure boiler inspection 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 inspection 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 inspector types:** 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

> Nevada Administrative Code, Title 455C. Boilers, Elevators, and Pressure Vessels Mine Section:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

Nevada — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** One annual certificate inspection; One annual external inspection while under pressure, if possible.

**Low-pressure boiler inspection interval:** one biennial certificate inspection, with an internal inspection at least once quadrennially where construction permits

**Pressure vessel inspection interval:** one biennial certificate inspection

**Accepted inspector types:** 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

New Hampshire — US boiler and pressure vessel inspection requirements by state


**State:** New Jersey

**Governing body:** Mechanical Inspection Bureau of Boiler and Pressure Vessel Compliance, Department of Labor and Workforce Development, Division of Public Safety and Occupational Safety & Health

**Statute citation:** New Jersey State Statutes, Title 34. Labor and Workers Compensation, Boilers and Pressure Vessels, New Jersey Administrative Code, 12:90.

**Power boiler inspection interval:** An annual internal and external inspection for steam boilers

**Low-pressure boiler inspection interval:** An annual external inspection and biennial internal inspection for hot-water boilers

**Pressure vessel inspection interval:** Each pressure vessel shall receive a certificate inspection triennially (for those not under owner-user inspection agency).

**Accepted inspector types:** 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.

**Exemptions:** 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

New Jersey — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** annual internal and external inspections

**Low-pressure boiler inspection interval:** annual external inspections and biennial internal inspections

**Accepted inspector types:** commissioned inspectors from authorized agencies who hold a Certificate of Competency. The state also recognizes API and National Board owner-user inspection programs

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>


**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 inspection interval:** An annual external inspection; An annual internal inspection, where construction permits.

**Low-pressure boiler inspection 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 inspector types:** 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°F and 160 psi pressure, and nominal water-containing capacity does not exceed 120 gallons.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

New Mexico — US boiler and pressure vessel inspection requirements by state

exemptions, governing_body, low_pressure_boiler_interval, power_boiler_interval, statute_citation


**State:** New York

**Governing body:** New York Department of Labor, Boiler Safety Bureau

**Statute citation:** New York State Laws, Labor, Chapter 31. Article 7, Section 204.

**Power boiler inspection interval:** 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.

**Low-pressure boiler inspection interval:** Low-pressure steam boilers: Internal 3 Years, External 2 Years. Low-pressure hot-water boilers: Internal 5 Years, External 2 Years.

**Accepted inspector types:** 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 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.

> New York State Laws, Labor, Chapter 31. Article 7, Section 204. RULES FOR CONSTRUCTION AND STAMPING Construction:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

New York — US boiler and pressure vessel inspection requirements by state


**State:** New York City

**Governing body:** City of New York, Department of Buildings

**Statute citation:** New York State Industrial Code Rules 4 and 14.

**Power boiler inspection interval:** 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).

**Low-pressure boiler inspection interval:** 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).

**Accepted inspector types:** 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 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

New York City — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** annual internal and external inspections (steam); annual external inspections and triennial internal inspections (hot-water)

**Low-pressure boiler inspection interval:** annual external inspections and triennial internal inspections (steam); annual external inspections and internal inspections every five years (hot-water)

**Accepted inspector types:** 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

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-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 inspection interval:** annual internal and external inspections, with external inspections conducted approximately six months after internal inspections

**Low-pressure boiler inspection interval:** triennial internal inspections and biennial external inspections (steam); internal inspections every five years and biennial external inspections (hot-water)

**Accepted inspector types:** commissioned insurance company inspectors and National Board-commissioned shop inspectors

> 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.

Source: <https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/>


**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 inspection interval:** High-pressure boilers: Internal 1 Year, External 1 Year.

**Low-pressure boiler inspection interval:** Low-pressure boilers and pressure vessels: External 2 Years.

**Pressure vessel inspection interval:** Low-pressure boilers and pressure vessels: External 2 Years. Hydropneumatic storage tanks: External 4 Years.

**Accepted inspector types:** 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.

> North Carolina General Statutes, Chapter 95, Article 7A, and North Carolina Administrative Code, Title 13, Chapter 13. RULES FOR CODES AND STAMPING Codes:

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

North Carolina — US boiler and pressure vessel inspection requirements by state


**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 inspection interval:** High-pressure boilers: Internal 1 Year, External 1 Year (while under pressure).

**Low-pressure boiler inspection 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 inspection interval:** Field inspection of pressure vessels (other than anhydrous ammonia pressure vessels) is not required.

**Accepted inspector types:** 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.

> 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.

Source: <https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select>

North Dakota — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, pressure_vessel_interval, state, statute_citation