Skilled Trades Regulation Act (2016 PA 407) boiler provisions + Boiler Code effective May 3, 2023: ASME BPVC 2019, B31.1-2018, CSD-1-2018, 2019 NBIC. Enforced by LARA Bureau of Construction Codes, Boiler Section (chief and deputy state inspectors or special inspectors). Verified on the primary source, re-checked weekly.
Certificate inspections: power, process and high-temperature water boilers annually, plus an external inspection under pressure; low-pressure steam/vapor heating boilers every 2 years; hot-water heating and supply boilers every 3 years (MCL 339.5943).
Source: primary document
Statewide layer. County and city amendments sit on top; the building view resolves them from your ZIP.
Rule set 2025-64 LR (new Part 9A Boiler Code; public hearing Sep 10, 2026) would adopt a newer ASME boiler code (notice says 2024 edition), ASME CSD-1 and the 2023 NBIC; effective 90 days after filing
There is no federal boiler certificate; the state program below is the whole obligation, with the ASME Boiler and Pressure Vessel Code and the National Board Inspection Code as the referenced standards.
Skilled Trades Regulation Act (2016 PA 407) boiler provisions + Boiler Code effective May 3, 2023: ASME BPVC 2019, B31.1-2018, CSD-1-2018, 2019 NBIC. Certificate inspections: power, process and high-temperature water boilers annually, plus an external inspection under pressure; low-pressure steam/vapor heating boilers every 2 years; hot-water heating and supply boilers every 3 years (MCL 339.5943).
LARA Bureau of Construction Codes, Boiler Section (chief and deputy state inspectors or special inspectors).
Rulemaking pending. Rule set 2025-64 LR (new Part 9A Boiler Code; public hearing Sep 10, 2026) would adopt a newer ASME boiler code (notice says 2024 edition), ASME CSD-1 and the 2023 NBIC; effective 90 days after filing
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