A. If a boiler or pressure vessel has a lap-seam crack along a longitudinal riveted joint, use of the shell or drum shall be discontinued immediately.
B. If the boiler is not more than 15 years old, a complete new course of the original thickness may be installed upon:
(1) Recommendation by the inspector; and
(2) Approval of the chief boiler inspector.
C. Patching a lap seam crack is prohibited.