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Subchapter 2. Boiler and Fired Pressure Vessel Safety Orders
Article 7. Repairs

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§786. Preparation for Welding.

(a) All cracks permitted to be repaired by welding shall be chipped or ground to form a clean welding groove with an included angle of not less than sixty degrees (60) and extending to a depth equal to at least the plate thickness less one-sixteenth inch (1/16"). The welding groove shall be extended until the crack has been removed for its entire length. Whenever possible the root of the weld shall be chipped out to clean metal and welded.

(b) Prior to repairing cracks by welding, all tubes, rivets, and threaded staybolts within 6 inches of the crack shall be removed. After welding is completed, such tube, rivet and/or staybolt holes shall be reamed before installing new tubes, rivets, or staybolts. For threaded staybolts the holes shall be tapped and new threaded staybolts installed. If a crack originates or terminates at a welded staybolt, the staybolt shall be removed prior to repairing the crack. After welding is completed, the hole shall be properly prepared for installation of the new staybolt in accordance with paragraph PW-19 of the Code.


1. Amendment filed 11-2-66; effective thirtieth day thereafter (Register 66, No. 38). Approved by State Building Standards Commission.

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