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Repair procedures Ameron produces repair couplings in 2 gh4-inch sizes.These couplings are 9listed 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 orfull couplings.See Fig.9-6 for proper cutting procedures. -----------, I When repairing lines which have already been in service and which may contain I I flammable fumes,do not use electric drills or other tools which may constitute a [ I spark hazard near the pipe.Use only air-driven or manual tools for I cutting and sanding. L-----------------------------J • Remove the affected area with a 1 Ih-inch hole saw. • Clean all burrs from edge of hole. Damaged area removed with hole saw r Fig.9-1.Minor damage to pipe can A;� be repaired by removing the o `�`Cr damaged area with a hole saw. Sand bonding surfaces J • 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. Glued areas Apply adhesive to cut edge of hole i 0 Y r0" Fig.9-2.Minor damage is repaired by removing the affected area-ith a hole d saw.A repair coupting 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------------------- -------- The ends of the pipe must be within 3 inches of each other for this repair procedure I to maintain the UL listing.Similarly,pipe insertion of at least 2 inches in the repair I couplings must be maintained. I L-----------------------------J 13