ASME Boiler and Pressure Vessel Code, 2021 edition, and ASME CSD-1, 2018 edition, via ARM 24.301.710 (effective Nov 6, 2021). Enforced by Montana DLI Building and Commercial Measurements Bureau. Checked on the primary source; the state record was last reviewed 2026-11-12.
DLI lists ASME BPVC (2021) and CSD-1 (2018) effective Nov 6, 2021. MCA 50-74-209 (last amended 2019): yearly inspection for manually fired boilers and units of 400,000 Btu/hr or more; every two years for smaller automatic boilers, yearly in schools, day cares, hospitals, rest homes and assembly over 100. DLI may approve longer intervals.
Source: primary document
Statewide layer. County and city amendments sit on top; confirm the local office for the address.
In force (ASME BPVC 2021 and CSD-1 2018 eff. Nov 6, 2021; DLI current-codes page re-read Oct 18, 2026)
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.
These apply when the building has the equipment or fits the type named. The frequency is the standard one; your local official can set a stricter one, so confirm it for the address.
ASME Boiler and Pressure Vessel Code, 2021 edition, and ASME CSD-1, 2018 edition, via ARM 24.301.710 (effective Nov 6, 2021). DLI lists ASME BPVC (2021) and CSD-1 (2018) effective Nov 6, 2021. MCA 50-74-209 (last amended 2019): yearly inspection for manually fired boilers and units of 400,000 Btu/hr or more; every two years for smaller automatic boilers, yearly in schools, day cares, hospitals, rest homes and assembly over 100. DLI may approve longer intervals.
Montana DLI Building and Commercial Measurements Bureau.
Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.
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