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9 Repair procedures Ameron produces repair couplings in 2 through 4-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------------------------------� 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 cutting and sanding. L------------------------------I • Remove the affected area with a 1 Ih-inch hole saw. • Clean all burrs from edge of hole. Damaged area removed With hole saw Fig.9-1.Minor damage to pipe can be repaired by removing the damaged area with a hole saw. Sand bonding surfaces • 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 Glued areas edge of hole 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. 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 - ---------------------------- Tie 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 2 inches in the repair couplings must be maintained. L------------------------------� 13 r