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0 <br /> Repair procedures Ameron produces repair couplings in 2 through 6-inch sizes.These couplings are listed <br /> by Underwriters Laboratories,Inc.for use in buried fuel systems and can be installed <br /> without in-trench tapering. <br /> Minor damage(delaminated areas under 1 inch in diameter) <br /> Minor damage is typically caused by impact and appears in the form of whitish discol- <br /> oration or small circumferential cracks.Minor repairs can be made using half-couplings <br /> or full couplings.See Fig.9-6 for proper cutting procedures. <br /> r------------------------------ <br /> i When repairing lines which have already been in service and which may contain i <br /> flammable fumes,do not use electric drills or other tools which may constitute a i <br /> i spark hazard near the pipe.Use only air-driven or manual tools for i <br /> L-----------------------------J <br /> • Remove the affected area with a 1'h-inch hole saw. <br /> • Clean all burrs from edge of hole. <br /> Damaged area removed <br /> With hole saw <br /> IN'\�W, <br /> Fig.9-1.Minor damage to pipe can <br /> be repaired by removing the <br /> Sand bonding surfaces <br /> • Using a flapper sander or emery cloth,abrade the pipe where it will contact the <br /> repair coupling halves and the entire inner surface of the coupling. <br /> • Apply adhesive to the cut edge of the hole and to the sanded areas. <br /> • Position the coupling halves so that the hole is centered and 90°away from <br /> the flanges. <br /> • After bolting the halves together,an adhesive bead should be visible around <br /> the edges of the coupling halves. <br /> • Allow the adhesive to cure before pressurizing the system. <br /> Glued areas <br /> Apply adhesive to cut edge <br /> of hole <br /> Fig.9-2.Minordamage is repaired by <br /> removing the affected area with a hole <br /> saw.A repair coupling is positioned so <br /> that the hole is centered and 90•away <br /> from the coupling flanges. Repair half coupling centered over hole <br /> Moderate damage(under 3 inches in length) <br /> If cracks and delaminated areas are too extensive to be encompassed by a hole saw, <br /> removal of a short section of pipe is necessary.For damage three inches or less in <br /> length,a coupling can be used to make the repair. <br /> • If using a half-coupling,align it precisely to maintain spacing requirements.The use <br /> of a full coupling is recommended. <br /> r-----------------------------� <br /> The ends of the pipe must be within 3 inches of each other for this repair procedure <br /> to maintain the UL listing.Similarly,pipe insertion of at least 1 inch in the repair <br /> couplings must be maintained. <br /> L------------------------------� <br /> 13 <br />