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REPAIR PROCEDURES For damaged pipe , NOV Fiber Class Systems recommends only the repair methods listed below. DO NOT attempt to re= pair damaged fittings . Always pressure test repair work before putting the line back into service to assure the soundness of the repaired section . Contact local representative for further information . During repair, the pipeline should not be under pressure and the area to be repaired must be clean and dry throughout the procedure . For Pied Thwea6 11M , Patch —t r � Damage Pipe Patching Follow these instructions to repair pipe wall damage where the damaged area is two inches (50 mm ) or less in diameter : • Cut the protective mesh covering and slide away from damaged area . Cut a length of good pipe long enough to adequately cover the damaged area and extend at least three inches ( 75 mm ) and prefer ably four inches ( 100 mm) to either side of the damaged area . ® Slit the " patch " lengthwise twice and remove a section so that about three-fourths of the circumference remains . ® Thoroughly sand the inner surface of the patch and sand a corresponding area on the pipe around the damaged section . Use 60 to 80 grit Emery cloth or sandpaper, a file , or a disc sander to remove all gloss from the surfaces to be bonded . • If solvent is used to clean all bond ing surfaces , allow the solvent to evaporate then apply a thick coat ing of adhesive to both surfaces , snap the patch in place , and apply pressure with hose clamps or banding material until the adhesive hardens . Heat curing methods described above may be used if necessary. The clamps may be left on or removed after curing . B Replace the protective mesh covering if the repair is made on primary 2 " (50 mm ) pipe . 34