CFR › Title 46 › Part 52 › §52.25-546 CFR §52.25-5Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkMiniature boilers must meet the requirements in PMB-1 through PMB-21 of Section I of the ASME BPVC (incorporated by reference; see § 52.01-1).