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(a) The maximum allowable working pressure of any code boiler shall be determined by the provisions of the code effective when the boiler was manufactured and upon its condition, determined after an internal inspection.
(b) The maximum allowable working pressure of any non-code power boiler shall be determined by the standards of the Code with a factor of safety not less than:
(1) Five if the boiler had been inspected and reported to the Division prior to January 1, 1936.
(2) Eight if the boiler had not been inspected and reported to the Division prior to January 1, 1936, and is of lap seam construction.
(3) Seven if the boiler had not been inspected and reported to the Division prior to January 1, 1936, and is of butt-strap construction.
(4) Six if of welded construction, providing it can be proven to the satisfaction of the Division that the material, workmanship, and details of construction are equivalent to the requirements for Code boilers.
(5) The factor of safety permitted at the time of last internal inspection prior to the adoption of these orders; provided, however, that a lower factor of safety may be allowed at the discretion of the Division.
(c) A higher factor of safety than provided for in (b) above may be applied at subsequent inspections by any qualified inspector when deterioration or other defects are found that affect the safety of the boiler.
(d) The maximum allowable working pressure of a fired pressure vessel constructed prior to the effect date of these orders shall be established in accordance with the rules of the code when applicable, or in accordance with good engineering practice regarding pressure vessel design.
1. Renumbered from former Section 757 (Register 65, No. 24).
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