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Oklahoma Statutes - Title 40. Labor Page 213 g. all boilers shall have a fusible plug that is constructed to the American Society of Mechanical Engineers (ASME) code and indicated by an ASME marking on the filler material. It shall protrude one (1) inch into the water on a fireside fusible plug and no more than one (1) inch on a waterside fusible plug, h. the pressure relief valve shall be National Board capacity certified, i. a gage glass shall be present with a guard to protect the glass, drain valve or petcock, be piped to a safe location, and be operational, j. try cocks shall be located in correlation to the minimum required water level, k. a pressure gage that has been tested and proven accurate at the time of the annual pressure test, l. all piping shall be schedule 80, black pipe (SA-53 B or SA-105 B) from the boiler to the first valve, m. the boiler shall be equipped with two means of supplying feed water while under pressure, and n. all welding to the boiler shall be done by a certified repair organization as accredited and described in Part RA of the National Boiler Inspection Code (NBIC). 2. Exhibitor boilers shall have a nondestructive exam performed once every five (5) years for determining repairs and thin areas that need to be repaired. An inspector from the Department of Labor may perform a random nondestructive exam annually. Results from the exam may be used by the inspector to waive any time remaining on the five-year period. A nondestructive exam shall meet the following requirements: a. on a dry bottom boiler, no less than 150 readings shall be taken, b. on a wet bottom boiler, no less than 180 readings shall be taken, c. this exam shall include the areas surrounding the crown sheet stays and any areas subject to corrosion, d. a loss of metal that is greater than forty percent (40%) of the original boiler plate thickness in an area greater than three (3) inches in diameter shall be considered to be a thin area and shall need to be repaired prior to any operation, e. exams shall be by a certified professional pursuant to applicable provisions of law of this state, f. no exam shall be by a certified professional that has a vested interest in the boiler that is being examined,