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(a) Qualified inspectors making the first field inspection of boilers required by these Orders to have a permit to operate, shall stamp on the boiler a state serial number (unless a state serial number has previously been stamped thereon) which shall become a permanent means of identification. This assigned number shall be made either by steel die figures not less than 5/16-inch in height, or outlined by means of center punch dots, with figures not less than 3/4-inch in height, and shall be stamped adjacent to the manufacturer's code stamping.
(b) No state serial number or code stamping shall be permanently covered by insulating material, unless such number and stamping is transferred to a fixed plate where readily visible outside of all insulating material.
1. Amendment filed 11-2-66; effective thirtieth day thereafter (Register 66, No. 38). Approved by State Building Standards Commission.