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ik.I1 17 IL";I% ENVIRONMENTAL HEEALTH 0EPAR Ti V�rNT REPAIR PROCEDURES For damaged pipe, NOV Fiber Glass 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 Red Thread IIA: "7 Patch —►� �� pamage 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 goad 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. • Replace the protective mesh covering if the repair is made on primary 2" (50 mm) pipe. 34