**State:** Ohio

**Governing body:** Ohio Department of Commerce, Division of Industrial Compliance – Boilers

**Statute citation:** Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers.

**Power boiler inspection interval:** Power boilers and high-pressure, high-temperature water boilers: Internal 1 Year, External 1 Year (under operating conditions).

**Low-pressure boiler inspection interval:** Low-pressure boilers: Internal 3 Years, External 1 Year (under operating conditions).

**Pressure vessel inspection interval:** Unfired pressure vessels are exempt from field inspection.

**Accepted inspector types:** Inspections made by inspectors of authorized insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.

**Exemptions:** Portable boilers or unfired pressure vessels located on farms and used solely for agricultural purposes. Steam or vapor boilers carrying a pressure of not more than 15 psig, located in private residences or in apartment houses of fewer than six family units. Hot-water boilers operated at temperatures not exceeding 250°F, located in private residences or in apartment houses of fewer than six family units. Unfired pressure vessels.

> Ohio Revised Code, Title 41. Labor and Industry, Chapter 4104. Division of Boiler Inspection, Chapter 4104. Boilers. RULES FOR CONSTRUCTION AND STAMPING Construction:

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

Ohio — US boiler and pressure vessel inspection requirements by state


**State:** Ohio

**Governing body:** Ohio Department of Commerce's Division of Industrial Compliance

**Statute citation:** Ohio Revised Code, Title 41, Chapter 4104

**Power boiler inspection interval:** annual internal and external inspections while operating

**Low-pressure boiler inspection interval:** triennial internal inspections and annual external inspections under operating conditions

**Accepted inspector types:** commissioned inspectors from authorized insurance companies

> Ohio Ohio’s inspection framework: Governing body: The Ohio Department of Commerce’s Division of Industrial Compliance oversees boiler inspections under Ohio Revised Code, Title 41, Chapter 4104. Authorized inspector types: Ohio accepts commissioned inspectors from authorized insurance companies. Inspection frequency: High-pressure boilers require annual internal and external inspections while operating. Low-pressure boilers require triennial internal inspections and annual external inspections under operating conditions.

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


**State:** Oklahoma

**Governing body:** Department of Labor, Safety Standards Division

**Statute citation:** Oklahoma State Statutes, Title 40. Labor, Oklahoma Boiler and Pressure Vessel Law, Sections 141.0 through 141.20 and Administrative Rules 380:25.

**Power boiler inspection interval:** Power boilers and high-temperature, high-pressure boilers: Internal 1 Year, External 1 Year (under pressure).

**Low-pressure boiler inspection interval:** Low-pressure steam and vapor heating boilers: Internal 2 Years, External 1 Year. Hot-water heating and hot-water supply boilers: Internal at the discretion of the inspector, External 1 Year.

**Pressure vessel inspection interval:** Pressure vessels subject to internal corrosion: Internal 3 Years, External 3 Years. Pressure vessels not subject to internal corrosion: Internal 10 Years, External 3 Years.

**Accepted inspector types:** Inspections made by insurance company inspectors may be accepted in lieu of inspections made by a department inspector, provided a photostatic copy of the inspector's National Board Certificate is furnished to the department and the inspector is authorized by the commissioner of labor.

**Exemptions:** Pressure vessels not exceeding 15 cubic feet in volume and 250 psig. Low-pressure steam boilers, hot-water heating boilers, hot-water supply boilers, hot-water supply heaters, or pressure vessels located in private residences or in apartment houses of fewer than six family units. Pressure vessels on remote sites limited to oil- and natural gas-gathering facilities, processing plants or gas-producing lease locations.

> Item | Internal | External | Power boilers and high-temperature, high-pressure boilers | 1 Year | 1 Year* | Low-pressure steam and vapor heating boilers | 2 Years | 1 Year | Hot-water heating and hot-water supply boilers | ** | 1 Year | Hot-water supply heaters | *** | 2 Years | Pressure vessels, excluding those within the scope of API Inspection Code, subject to internal corrosion, and waste heat team generators | 3 Years | 3 Years | Pressure vessels not subject to internal corrosion | 10 Years | 3 Years | *Under pressure. **At the discretion of the inspector. ***Only those located in public facilities. Vessels within the scope of the API Inspection Code shall be inspected as prescribed therein. Downstream welded steam piping exceeding 15 psi requires inspection.

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

Oklahoma — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, state, statute_citation


**State:** Oregon

**Governing body:** Department of Consumer and Business Services, Building Codes Division, Boiler and Pressure Vessel Group

**Statute citation:** Oregon Revised Statutes, Volume 11, Title 38. Protection from Fire, Chapter 480. Explosives, Flammable Materials, Pressure Vessels, Sections 510 through 990.

**Power boiler inspection interval:** Power Boilers: Internal 1 Year, External 1 Year.

**Low-pressure boiler inspection interval:** Low-pressure steam and vapor-heating boilers: Internal 2 Years, External 2 Years. Cast-iron boilers: External 2 Years. Low-pressure hot-water heating and hot-water supply boilers: Internal 6 Years, External 2 Years.

**Pressure vessel inspection interval:** Pressure vessels subject to internal corrosion: Internal 2 Years, External 2 Years. Pressure vessels not subject to internal corrosion: External 2 Years. Pressure vessels containing anhydrous ammonia intended for use as a fertilizer: External 3 Years.

**Accepted inspector types:** Inspections made by special boiler inspectors holding a valid Oregon Certificate of Competency from the Building Codes Division and continuously employed by insurance companies authorized to write boiler and machinery insurance in the state are accepted in lieu of inspections made by a deputy boiler inspector.

**Exemptions:** Boilers and pressure vessels under federal control. Domestic water heaters not exceeding 120 gallons, 210°F, 150 psig, and 200,000 BTU per hour. Boilers operated at less than 15 psig located on farms and used solely for agricultural purposes. Boilers or pressure vessels used in a single private residence (exempt from subsequent inspections after installation). Pressure vessels operated at less than 15 psig.

> INSURANCE INSPECTION REQUIREMENTS Inspections made by special boiler inspectors holding a valid Oregon Certificate of Competency from the Building Codes Division and continuously employed by insurance companies authorized to write boiler and machinery insurance in the state are accepted in lieu of inspections made by a deputy boiler inspector.

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

Oregon — 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:** Pennsylvania

**Governing body:** Department of Labor and Industry, Boiler Division

**Statute citation:** The Pennsylvania Code, No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17.

**Power boiler inspection interval:** Power boilers, internal and external: 1 Year. (May be extended to 24 months under certain conditions.)

**Low-pressure boiler inspection interval:** Low-pressure steam vapor, hot-water heating and hot-water supply boilers: 2 Years.

**Pressure vessel inspection interval:** Unfired pressure vessels: 3 Years.

**Accepted inspector types:** Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.

**Exemptions:** Boilers and pressure vessels owned or operated by the federal government. Boilers located on farms, except in sales areas which are accessible to the public. Boilers located in single-family dwellings or multi-unit dwellings with four or fewer units. Storage water heaters and instantaneous water heaters if heat input does not exceed 200,000 BTU/HR, water temperature does not exceed 210°F, and nominal water-containing capacity does not exceed 120 gallons.

> INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.

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

Pennsylvania — US boiler and pressure vessel inspection requirements by state


**State:** Pennsylvania

**Governing body:** Department of Labor and Industry's Boiler Division

**Statute citation:** Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17

**Power boiler inspection interval:** annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met

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

**Accepted inspector types:** commissioned inspectors from authorized insurance companies and registered owner inspection agencies

> The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.

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


**State:** Puerto Rico

**Governing body:** Commonwealth of Puerto Rico, Department of Labor and Human Resources, P.R. Occupational Safety and Health Administration (PR OSHA), Boiler and Elevator Division

**Statute citation:** Regulation Number 17 of the Office of the Assistant Secretary for Occupational Safety & Health, Regulation of Boilers and Pressure Vessels

**Power boiler inspection interval:** One annual internal; One annual external and operational.

**Low-pressure boiler inspection interval:** One annual internal; One annual external and operational.

**Pressure vessel inspection interval:** One annual internal; One annual external and operational.

**Accepted inspector types:** Inspections are made by private inspectors and inspectors employed by insurance companies authorized by the Secretary of Labor and Human Resources. (Department of Labor and Human Resources does not make inspections).

**Exemptions:** All boilers and pressure vessels, except definitions and exemptions as established by ASME Code.

> Boilers and Pressure Vessels: One annual internal; One annual external and operational.

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

Puerto Rico — US boiler and pressure vessel inspection requirements by state


**State:** Rhode Island

**Governing body:** Department of Labor and Training, Division of Occupational Safety

**Statute citation:** Rhode Island General Law, Title 28. Labor and Labor Relations, Chapter 25. Boiler Inspections and Pressure Vessels, Sections 1 through 23. Rhode Island Rule 260-RICR-30-10-2.

**Power boiler inspection interval:** Power boilers and high-pressure, high temperature water boilers shall receive an inspection annually which shall be an internal inspection where construction permits; otherwise, it shall be as complete an inspection as possible. Such boilers shall also be inspected externally annually while under normal operating conditions.

**Low-pressure boiler inspection interval:** Low pressure boilers, hot water heaters, and hot water storage tanks shall receive an inspection biennially. Steam or vapor boilers shall have an external inspection biennially and may have an internal inspection, if deemed necessary, at the discretion of the inspector. Hot water heating and hot water supply boilers shall have an external inspection biennially and where construction permits, an internal inspection at the discretion of the inspector.

**Pressure vessel inspection interval:** Unfired pressure vessels shall receive an inspection triennially. This inspection shall be internal where construction permits. Pressure vessels not subject to internal corrosion shall be inspected externally.

**Accepted inspector types:** An authorized inspector means an Inspector employed by the State of Rhode Island or an Authorized Insurance Company holding a National Board Inservice Commission, and who is regularly employed by the State or an Insurance Company authorized to insure against loss from explosion of boilers or pressure vessels in this State.

**Exemptions:** Water heaters and water storage tanks where heat input does not exceed 200,000 BTU/Hr, water temperature does not exceed 210 degrees Fahrenheit, and nominal water capacity does not exceed 120 gallons. Continuous coil type hot water boilers used only for "steam vapor" cleaning when nominal water containing capacity does not exceed six (6) gallons and water temperature does not exceed 350 degrees Fahrenheit.

> Power boilers and high-pressure, high temperature water boilers shall receive an inspection annually which shall be an internal inspection where construction permits; otherwise, it shall be as complete an inspection as possible. Such boilers shall also be inspected externally annually while under normal operating conditions. Low pressure boilers, hot water heaters, and hot water storage tanks shall receive an inspection biennially. . Steam or vapor boilers shall have an external inspection biennially and may have an internal inspection, if deemed necessary, at the discretion of the inspector and shall include the function of all controls and safety devices. Hot water heating and hot water supply boilers shall have an external inspection biennially and where construction permits, an internal inspection at the discretion of the inspector. Water Heater boilers including hot water storage tanks shall have an external inspection biennially and shall include the function of all controls and devices. Except as provided for in SS 2.5.2(D) and (E) of this Part, unfired pressure vessels shall receive an inspection triennially. This inspection shall be internal where construction permits. Pressure vessels not subject to internal corrosion shall be inspected externally.

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

Rhode Island — US boiler and pressure vessel inspection requirements by state


**State:** South Carolina

**Governing body:** S.C. Department of Labor, Licensing, and Regulation, Boiler Safety Program

**Statute citation:** South Carolina Code of Laws, Title 41. Labor and Employment, Chapter 14. Boiler Safety Act , Sections 41-14-10 through 41-14-150.

**Power boiler inspection interval:** annually

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

**Exemptions:** Boilers located on farms used solely for agricultural or horticultural purposes; Heating boilers located in private residences or in apartment houses of less than six family units

> Power boilers and high-pressure, high-temperature water boilers: annually. Inspection must be internal; however, if internal inspection is not possible, the inspection must be as complete as possible. Boilers must be externally inspected while under pressure, if possible. Internal inspection must be done within six months. Low-pressure steam or vapor heating boilers: biennially. An internal inspection must be conducted every four years where installation permits. Hot-water heating and hot-water supply boilers: biennially. An internal inspection must be conducted at the discretion of the inspector.

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

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

exemptions, governing_body, state, statute_citation


**State:** South Dakota

**Governing body:** State Fire Marshal's Office

**Statute citation:** South Dakota Codified Laws, Title 34. Public Safety and Health, Chapter 29A. Boiler Safety , Sections 1 through 55.

**Power boiler inspection interval:** 1 Year internal; 1 Year external

**Low-pressure boiler inspection interval:** 2 Years internal; 2 Years external

**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 under federal jurisdiction; Boilers located on farms (if farm is not regularly open to general public and boiler is used solely for agricultural or horticultural purposes); Heating boilers located in private residences or in apartment houses of fewer than six family units; Boilers located in a refinery; Boilers used as part of an electricity generating plant; Historic power boilers

> Lorimor, Chief Boiler Inspector State Fire Marshal's Office 221 South Central Avenue Pierre, SD 57501 Telephone — 605.773.3562 EMPOWERMENT State senate and house of representatives empowered to make, alter, and amend rules and regulations. Boiler Board: No. DATE OF LAW PASSAGE: 1973 Date of latest amendment to law: July 2003. Date rules and regulations implemented: 1973. Date of latest rules and regulations: October 2003. State statute: South Dakota Codified Laws, Title 34. Public Safety and Health, Chapter 29A. Boiler Safety , Sections 1 through 55. RULES FOR CONSTRUCTION AND STAMPING Construction:

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

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

accepted_inspectors, exemptions, low_pressure_boiler_interval, power_boiler_interval


**State:** Tennessee

**Governing body:** Department of Labor and Workforce Development, Boiler Inspection Unit

**Statute citation:** Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair .

**Power boiler inspection interval:** 1 Year internal; 1 Year external

**Low-pressure boiler inspection interval:** 2 Years internal; 2 Years external

**Pressure vessel inspection interval:** 2 Years internal; 2 Years external (subject to corrosion); certificate inspection every two years for others

**Accepted inspector types:** Inspections made by inspectors employed by insurance and owner/user companies and commissioned by the department are accepted in lieu of inspections made by department inspector.

**Exemptions:** Boilers located on farms used solely for agricultural purposes; Boilers and pressure vessels located in municipalities where boiler inspection ordinances are in force; Steam boilers used for heating purposes carrying a pressure of not more than 15 psi, located in private residences or in apartment houses of fewer than six families; Hot-water heating boilers carrying a pressure of not more than 30 psi, located in private residences or in apartment houses of fewer than six families

> Tennessee Code Annotated, Title 68. Health, Safety and Environmental Protection, Chapter 122. Boiler Inspection, Erection and Repair . RULES FOR CONSTRUCTION AND STAMPING Construction:

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

Tennessee — 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:** Tennessee

**Governing body:** Department of Labor and Workforce Development's Boiler Inspection Unit

**Statute citation:** Tennessee Code Annotated, Title 68, Chapter 122

**Power boiler inspection interval:** annual internal and external inspections, with external inspections conducted while under pressure

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

**Accepted inspector types:** Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, commissioned insurance and owner company inspectors

> The Department of Labor and Workforce Development’s Boiler Inspection Unit oversees inspections under Tennessee Code Annotated, Title 68, Chapter 122. Authorized inspector types: Department deputy inspectors conduct all initial inspections of new, reinstalled, and secondhand high-pressure and low-pressure boilers. For ongoing inspections, Tennessee accepts commissioned insurance and owner company inspectors. Inspection frequency: High-pressure boilers require annual internal and external inspections, with external inspections conducted while under pressure. Low-pressure boilers require biennial internal and external inspections.

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


**State:** Texas

**Governing body:** Texas Department of Licensing and Regulation (TDLR), Compliance Division/Boiler Program

**Statute citation:** Boiler Law, Texas Health and Safety Code, Chapter 755. Administrative Rules, 16 Texas Administrative Code, Chapter 65.

**Power boiler inspection interval:** annual certificate inspection and an annual external inspection

**Low-pressure boiler inspection interval:** certificate inspection biennially

**Accepted inspector types:** Inspections of boilers made by authorized inspectors employed by accredited authorized inspection agencies and commissioned by the department are required in lieu of inspections made by a deputy boiler inspector.

**Exemptions:** boilers owned or operated by the federal government; manually fired miniature boilers constructed or maintained for locomotives, boats, tractors, or stationary engines only as a hobby; boilers designed for operation only at atmospheric pressure; steam cookers; Heating boilers used to heat buildings exclusively for residential use and having accommodations for not more than four families

> Power boilers, unfired steam boilers, and steam collection or liberation drums of process steam generators must receive an annual certificate inspection and an annual external inspection. Steam-heating boilers and hot-water heating boilers must receive a certificate inspection biennially. Hot-water supply boilers and potable water heaters must receive a certificate inspection triennially.

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

Texas — US boiler and pressure vessel inspection requirements by state


**State:** Utah

**Governing body:** Utah Labor Commission, Division of Boiler, Elevator, and Coal Mine Safety

**Statute citation:** Utah Condensed Constitution, Title 34A. Utah Labor Code, Chapter 7. Safety , Sections 101 through 104.

**Power boiler inspection interval:** Annual certificate inspection; Annual external inspection while under operating conditions

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

**Pressure vessel inspection interval:** High-pressure heat exchangers: biennial certificate inspection; All others: quadrennial certificate inspection

**Accepted inspector types:** Inspections made by inspectors employed by insurance companies holding a Utah Certificate of Competency are accepted in lieu of inspections by division inspectors.

**Exemptions:** Those boilers or pressure vessels under federal control; Boilers and pressure vessels located in private residences or in apartment houses with fewer than five family units; Hot-water supply boilers directly fired with oil, gas, or electricity when heat input does not exceed 200,000 BTU per hour, water temperature 210°F, water-containing capacity 120 gallons

> High-pressure heat exchangers: biennial certificate inspection; All others: quadrennial certificate inspection. Upon application from the owner/user (with a recommendation by the state boiler inspector or special inspector), the Labor Commission may authorize extension of the inspection period. Extension shall be granted in writing by the safety director with original and one copy going to the boiler operator and a second copy going to the authorized inspector. When the commission grants an extension, a new certificate (to be properly posted) will be issued to replace the original shorter-term certificate. The old certificate shall be destroyed. Owner/user pressure vessels shall be inspected in accordance with ANSI/API-510 when such owner/user organizations are approved by the commission. INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors employed by insurance companies holding a Utah Certificate of Competency are accepted in lieu of inspections by division inspectors. Reports of certificate inspection must be filed with the division on approved forms within 30 days.

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

Utah — US boiler and pressure vessel inspection requirements by state

exemptions, governing_body, power_boiler_interval, statute_citation


**State:** Vermont

**Governing body:** Department of Public Safety, Division of Fire Safety

**Statute citation:** Vermont Statutes Annotated, Title 20 VSA, Chapter 173, Subchapter 5, Vermont Fire & Building Safety Code - 2015.

**Power boiler inspection interval:** Annual internal and external inspection while not under pressure; External inspection, while in operation and under pressure, approximately six months from the internal inspection

**Low-pressure boiler inspection interval:** 2 year external inspection; 2 year internal inspection, where construction permits

**Pressure vessel inspection interval:** 3 year external inspection; 3 year internal inspection, where construction permits

**Accepted inspector types:** Inspections made by inspectors with a National Board commission and commissioned by the department are required.

**Exemptions:** Boilers or pressure vessels located on common carriers subject to Surface Transportation Board, US Department of Transportation, Federal Railroad Administration, or Nuclear Regulatory Commission; Hot-water heaters and potable water storage tanks with heat input of less than 200,000 BTU per hour, water temperature less than 210°F, water-containing capacity less than 120 gallons

> High pressure power boilers (more than 15 psi) and high temperature water boilers: Annual internal and external inspection while not under pressure; External inspection, while in operation and under pressure, approximately six months from the internal inspection. Low-pressure hot water heating boilers (not exceeding 160 psi and/or temperatures not exceeding 250 degrees) and low-pressure steam boilers (not exceeding 15 psi): 2 year external inspection; 2 year internal inspection, where construction permits, for steam heating boiler (not exceeding 15 psi).

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

Vermont — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, pressure_vessel_interval, state, statute_citation


**State:** Virginia

**Governing body:** Department of Labor and Industry, Boiler and Pressure Vessel Safety Division

**Statute citation:** Code of Virginia, Title 40. Labor and Employment, Chapter 3.1. Boiler and Pressure Vessel Safety Act , Sections 40.1.51.5 through 40.1.51.19.5. and Virginia Administrative Code, Title 16. Labor and Employment, Agency 25. Safety and Health Codes Board, Chapter 40, Standards for Boiler and Pressure Vessel Certification , Sections 10 through 70 and Chapter 55, Financial Requirements for Boiler and Pressure Vessel Contract Fee Inspectors , Sections 10 through 20.

**Power boiler inspection interval:** Certificate inspection annually; External inspection annually while under operating conditions, if possible

**Low-pressure boiler inspection interval:** Certificate inspection biennially

**Pressure vessel inspection interval:** Certificate inspection biennially

**Accepted inspector types:** Reports of inspection made by authorized insurance company inspectors or contract-fee inspectors shall be filed with the chief inspector on National Board forms within 30 days. Such inspections are acceptable in lieu of state inspections.

**Exemptions:** Boilers or unfired pressure vessels owned or operated by the federal government or any agency thereof; Boilers or fired or unfired pressure vessels used in or on the property of private residences or apartment houses of less than four apartments; Hobby or model boilers; Hot water supply boilers, water heaters, and unfired pressure vessels used as hot water supply storage tanks when heat input does not exceed 200,000 BTU per hour, water temperature 210°F, water-containing capacity 120 gallons

> Power boilers and high-temperature water boilers: Certificate inspection annually; External inspection annually while under operating conditions, if possible. Heating boilers: Certificate inspection biennially: Steam boilers: An internal inspection where construction permits; Water boilers: An external inspection with internal inspection at discretion of the inspector, where construction permits. Pressure vessels subject to internal corrosion: certificate inspection biennially with internal inspection at discretion of inspector, where construction permits.

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

Virginia — US boiler and pressure vessel inspection requirements by state


**State:** Washington, D.C.

**Governing body:** Department of Buildings

**Statute citation:** District of Columbia Code, Division 1. Government of District, Title 2. Government Administration, Chapter 1. Inspections – Boilers . DCMR Title 17 Chapter 4 (Steam Engineers). DCMR Title 12 Chapter 10E (Boilers, Water Heaters and Pressure Vessels).

**Power boiler inspection interval:** annual internal inspection

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

**Pressure vessel inspection interval:** annual external inspection

**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:** Those under federal government jurisdiction; Those on boats or floating equipment; Those on railway locomotives; Those under the Public Utilities Commission jurisdiction; Unfired pressure vessels with a capacity of 15 gallons or less, and those constructed for a pressure of 60 psi or less

> Steam boilers: an annual internal inspection. Cast-iron boilers and unfired pressure vessels: an annual external inspection. Portable and other unfired pressure vessels: an annual external inspection.

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

Washington, D.C. — US boiler and pressure vessel inspection requirements by state


**State:** Washington D.C.

**Governing body:** Department of Buildings

**Statute citation:** District of Columbia Code, Division 1, Title 2, Chapter 1, and DCMR Title 17, Chapter 4 and Title 12, Chapter 10E

**Power boiler inspection interval:** annual internal inspections

**Low-pressure boiler inspection interval:** annual external inspections (cast-iron boilers)

**Accepted inspector types:** Department inspectors conduct all first inspections regardless of insurance status. For subsequent inspections, commissioned insurance company inspectors

> Governing body: The Department of Buildings administers inspections under District of Columbia Code, Division 1, Title 2, Chapter 1, and DCMR Title 17, Chapter 4 and Title 12, Chapter 10E. Authorized inspector types: Department inspectors conduct all first inspections regardless of insurance status. For subsequent inspections, Washington, D.C., accepts commissioned insurance company inspectors. Inspection frequency: High-pressure steam boilers require annual internal inspections. Low-pressure cast-iron boilers require annual external inspections.

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

Washington D.C. — US boiler and pressure vessel inspection requirements by state


**State:** Washington

**Governing body:** Department of Labor and Industries, Field Services & Public Safety Division (FS & PS), Boiler Program

**Statute citation:** Chapter 296-104 WAC and Chapter 70.79 RCW.

**Power boiler inspection interval:** 1 Year internal; 1 Year external

**Low-pressure boiler inspection interval:** 2 Years internal; 2 Years external

**Pressure vessel inspection interval:** 2 Years internal (when subject to corrosion); 2 Years external

**Accepted inspector types:** Inspections made by inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections by a department inspector.

**Exemptions:** Boilers and pressure vessels under federal regulation or operated by any railroad; Boilers and pressure vessels located on farms and used solely for agricultural purposes; Steam boilers used exclusively for heating purposes carrying a pressure of not more than 15 psig and which are located in private residences or in apartment houses of fewer than six families; Hot-water heating boilers with a pressure of not more than 30 psi located in private residences or apartment houses of fewer than six families; Boilers and pressure vessels in cities having ordinances which are enforced and which have requirements equal to or higher than those provided for under this chapter

> Chapter 296-104 WAC and Chapter 70.79 RCW. RULES FOR CONSTRUCTION AND STAMPING Construction: ASME Code (Current). (Sections I, III, IV, VIII, Div. 1,2,3, X, XII, XIII). ASME CSD-1, Part CF (Current) and other jurisdictional accepted national and and international standards. Code case interpretations when accepted by the chief inspector. Standards of construction approved by the chief inspector and meeting the National Board criteria for registration of boilers, pressure vessels and other pressure-retaining items. ASME PVHO-1 (Current). Manufacturer’s Data Reports for new standard boilers and unfired pressure vessels shall be registered with the National Board. Inspection: National Board Inspection Code (Current), Part 1, Installation , Part 2, Inspection , Part 3, Repairs and Alterations , and Part 4, Pressure Relief Devices . The standard for inspection of nuclear items is ASME Section XI, current edition. National Board Certified Owner/User Organizations may choose to use API-510, current edition. Pulp and paper manufacturers may use TAPPI TIP 0402-16, 2011 edition, when requested and approved by the chief inspector. The following rule changes became effective in Washington State July 1, 2025.

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

Washington — US boiler and pressure vessel inspection requirements by state


**State:** West Virginia

**Governing body:** Division of Labor, Safety Section

**Statute citation:** West Virginia Code, Chapter 21. Labor, Article 3. Safety and Welfare of Employees, Section 7. Regulation of Operation of Steam Boilers .

**Power boiler inspection interval:** Annual internal and external

**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 division inspector.

**Exemptions:** Boilers under the jurisdiction of the federal government; Boilers carrying not more than 15 psi; Railroad locomotive boilers subject to inspection under federal laws; Portable boilers used for agricultural purposes; Boilers on automobiles; Boilers in private residences used solely for residential purposes; Sectional boilers; Small portable boilers used in the oil and gas industry

> INSPECTIONS REQUIRED Installation. Annual internal and external. Rental boilers coming into the state for temporary use.

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

West Virginia — US boiler and pressure vessel inspection requirements by state


**State:** West Virginia

**Governing body:** Division of Labor's Safety Section

**Statute citation:** West Virginia Code, Chapter 21, Article 3, Section 7

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

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

**Accepted inspector types:** commissioned insurance company inspectors who hold a West Virginia Certificate of Competency

> The Division of Labor’s Safety Section oversees steam boiler inspections under West Virginia Code, Chapter 21, Article 3, Section 7. Authorized inspector types: West Virginia accepts commissioned insurance company inspectors who hold a West Virginia Certificate of Competency. Inspection frequency: All covered steam boilers require annual internal and external inspections.

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


**State:** Wisconsin

**Governing body:** Department of Safety & Professional Services, Division of Industry Services

**Statute citation:** Pursuant to S.101.17m the Department of Safety & Professional Services, Division of Industry Services, enforces Wisconsin Administrative Code, SPS Chapter 341, Boilers and Pressure Vessels .

**Power boiler inspection interval:** One annual internal inspection

**Low-pressure boiler inspection interval:** one external or internal inspection every 36 months

**Pressure vessel inspection interval:** one external or internal inspection every 36 months

**Accepted inspector types:** Inspections made by inspectors employed by insurance companies and holding Certificates of Competency issued by the department are accepted in lieu of inspections made by a department inspector. Inspections made by inspectors employed by owners/users and holding Certificates of Competency issued by the department are accepted in lieu of inspections made by a department inspector.

**Exemptions:** Boilers or pressure vessels regularly inspected by US government inspectors; Heating boilers located in private residences or in apartment buildings having fewer than three family units; Boilers used exclusively for agricultural purposes; Hot-water supply boilers, water heaters, and hot-water storage tanks in which the temperature does not exceed 210°F; Installations at one or two family dwellings

> One annual internal inspection. Where an internal inspection is not possible because of boiler construction, an external inspection will be acceptable. Should operating conditions require longer periods, an extension of time may be granted upon written application to the department with written concurrence of inspection agency. Low-pressure steam and hot-water boilers: one external or internal inspection every 36 months. Pressure vessels: one external or internal inspection every 36 months. Anhydrous ammonia storage and nurse tanks: one inspection every 36 months. Power piping: welder documentation and material inspection prior to start of fabrication (installed to ASME B31.1). INSURANCE INSPECTION REQUIREMENTS The department must be notified of suspension of insurance because of dangerous conditions . The department must be notified of new business or discontinuance of insurance . CERTIFICATE OF INSPECTION Certificate of Inspection is issued by the State of Wisconsin.

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

Wisconsin — US boiler and pressure vessel inspection requirements by state

accepted_inspectors, exemptions, governing_body, statute_citation


**State:** Wisconsin

**Governing body:** Department of Safety and Professional Services' Division of Industry Services

**Statute citation:** Wisconsin Administrative Code, SPS Chapter 341

**Power boiler inspection interval:** annual internal inspections, with external inspections accepted where internal access is not possible

**Low-pressure boiler inspection interval:** external or internal inspections every 36 months

**Accepted inspector types:** insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department

> Division of Industry Services administers inspections under Wisconsin Administrative Code, SPS Chapter 341. Authorized inspector types: Wisconsin accepts insurance company inspectors and owner inspectors who hold Certificates of Competency issued by the department. Inspection frequency: High-pressure boilers require annual internal inspections, with external inspections accepted where internal access is not possible. Low-pressure boilers require external or internal inspections every 36 months.

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


**State:** Wyoming

**Governing body:** Department of Workforce Services, Workers’ Safety–OSHA

> Wyoming state government does not employ boiler or pressure vessel inspectors nor does it have general boiler or pressure vessel rules.

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

Wyoming — US boiler and pressure vessel inspection requirements by state