Sec. 14-10.7. Lap seam crack

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The shell or drum of a boiler in which a typical “lap seam crack” is discovered along a longitudinal riveted joint for either butt seam or lap joints shall be permanently discontinued for use under steam pressure. By “lap seam crack” is meant the typical crack frequently found in lap seams extending parallel to the longitudinal joint and located either between or adjacent to rivet holes.

                    
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