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r •,Repair procedures Fig. 9-1. Minordamage to pipe can be repaired by removing the Fig. 9-2. Minor damage is repaired by removing the affected area with a hole saw. A repair coupling is positioned so that the hole is centered and 90• away from the coupling flanges. Ameron produces repair couplings in 2 through 6 -inch sizes. These couplings are listed by Underwriters Laboratories, Inc. for use in buried fuel systems and can be installed without in -trench tapering. Minor damage (delaminated areas under 1 inch in diameter) Minor damage is typically caused by impact and appears in the form of whitish discol- oration or small circumferential cracks. Minor repairs can be made using half -couplings or full couplings. See Fig. 9-6 for proper cutting procedures. r-----------------------------, 1 When repairing lines which have already been in service and which may contain flammable fumes, do not use electric drills or other tools which may constitute a spark hazard near the pipe. Use only air -driven or manual tools for L------------------------------= • Remove the affected area with a 1 Ih-inch hole saw. • Clean all burrs from edge of hole. J IN NO I WON, "Id Sand bonding surfaces namaned area removed • Using a flapper sander or emery cloth, abrade the pipe where it will contact the repair coupling halves and the entire inner surface of the coupling. • Apply adhesive to the cut edge of the hole and to the sanded areas. • Position the coupling halves so that the hole is centered and 90° away from the flanges. • After bolting the halves together, an adhesive bead should be visible around the edges of the coupling halves. • Allow the adhesive to cure before pressurizing the system. Apply adhesive to cut edge of hole Glued areas Repair half -coupling centered over hole Moderate damage (under 3 inches in length) If cracks and delaminated areas are too extensive to be encompassed by a hole saw, removal of a short section of pipe is necessary. For damage three inches or less in length, a coupling can be used to make the repair. • If using a half -coupling, align it precisely to maintain spacing requirements. The use of a full coupling is recommended. r-----------------------------, The ends of the pipe must be within 3 inches of each other for this repair procedure to maintain the UL listing. Similarly, pipe insertion of at least 1 inch in the repair t couplings must be maintained. L------------------------------� 13