49 CFR §230.30
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Every boiler having lap-joint longitudinal seams without reinforcing plates shall have sufficient lagging, jacketing, flues, and tubes removed at every annual inspection so that an inspection of the entire joint, inside and out, can be made, taking special care to detect grooving or cracks at the edges of the seams.