Minnesota
For Minnesota, governing body is Minnesota Department of Labor and Industry, Construction Codes and Licensing Division, Boiler Division; statute citation is Minnesota Statutes – 2023, Chapters 326B.93 to 326B.998, Boilers. Minnesota Rules – Chapter 5225; power boiler inspection interval is Boilers and steam generators: one annual inspection; low-pressure boiler inspection interval is Boilers and steam generators: one annual inspection; pressure vessel inspection interval is Unfired pressure vessels: biennial inspection, recorded from its source on 2026-08-05.
- State
- Minnesota
- Governing body
- Minnesota Department of Labor and Industry, Construction Codes and Licensing Division, Boiler Division unconfirmed
- Statute citation
- Minnesota Statutes – 2023, Chapters 326B.93 to 326B.998, Boilers. Minnesota Rules – Chapter 5225. unconfirmed
- 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. unconfirmed
Values marked unconfirmed are shown, but we could not tie them to the quote below: Exemptions, Governing body, Statute citation. Read the quote and judge them yourself.
What the source says
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.
— nationalboard.org, retrieved 2026-08-05
Source
- nationalboard.orghttps://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select