Mich. Admin. Code R. 339.5242 - Lap seam crack
Rule 242. The shell or drum of a boiler in which a typical lap seam crack is discovered along a longitudinal riveted joint or lap joints must be permanently discontinued for use under pressure. "Lap seam crack" as used in this rule, means the typical crack frequently found in lap seams extending parallel to the longitudinal joint and located either between or adjacent to rivet holes.
Notes
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