California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 2 - Boiler and Fired Pressure Vessel Safety Orders
Article 5 - Inspection
Section 776 - Special Inspection of Lap Seam Boilers
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Horizontal return tubular boilers over thirty-six-inch (36") diameter with longitudinal lap-riveted seams shall not be operated at a pressure in excess of fifty pounds (50 lbs.) per square inch unless all of the following are done every five (5) years of operation:
The term five (5) years used in this section shall mean five (5) years under steam, but in no case shall the time of service be taken as less than six (6) months per calendar year; a hydrostatic test of one and one-half (1 1/2) times the allowed pressure on the boiler shall be made in the presence of a qualified inspector at least every five (5) calendar years. Each boiler shall be subject to any additional requirements found necessary by the qualified inspector.
(b) Secondhand lap seam horizontal return tubular boilers exceeding thirty-six inches (36") diameter shall not be permitted a maximum allowable working pressure in excess of fifty (50) psi.
(c) The shell or drum of a boiler in which a typical lap seam crack is discovered along a longitudinal riveted seam for either butt-strap or lap-riveted construction shall be permanently discontinued for use under 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.
