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• • 7. While the pipe is being checked for leaks, do not t stand at the end of theP�P� g t to system or where it changes directions. CAUTION: Failure to strictly fol- low these instructions can result in serious personal injury, death, and/or property damage. 8. Smith Fiberglass Products recommends that after the piping has passed the 50 psig (0.345 MPa) pressure test, the contractor should reduce the product line pressure to a pressure of not more than 25 psig (0.172 MPa) and maintain this pressure until all paving has been completed. Leave pressure gauge on each line for in- spection. The contractor should check the gauge daily to verify that the pipe is holding pressure. If a leak is encountered during the test procedure, im- mediately release all pressure in the piping system and refer to Section 8 for proper repair procedures. Upon completing any necessary repairs to the piping system, follow the proper testing sequence and verify the sys- tem's integrity. SECTION 8 • REPAIR PROCEDURES For damaged pipe and for leaking joints, Smith Fiberglass Products recommends only the repair methods listed be- low. DO NOT attempt to repair damaged fittings. Always pressure test repair work before putting the line back into service to assure the soundness of the repaired section. Contact your local Smith Fiberglass Products' representa- tive for further information. During repair, the pipeline cannot be under pressure, and the area to be repaired must be clean and dry throughout the procedure. 1.8.1 Repairing Weather Damage When machined surfaces of pipe or fittings are exposed to direct sunlight prior to installation, the result is a loss of joint bonding strength. Therefore, if protective coverings have been removed and ultraviolet exposure was greater than one day, the following steps must be taken: 1. For exposed spigot ends, cut V to 1" (13 mm to 25 mm) off the end and retailer. This will remove the weathered layer and give a fresh surface for bonding. For fittings with spigot ends, it is sometimes possible to lightly sand the spigot using the same procedure as for bell ends. For exposed bell ends (pipe or fittings), sand thor- oughly until the entire surface appears fresh. Hand sanding with 40 grit sandpaper is recommended. A flapper sander of about 40 grit mounted on an elec- tric hand drill also works well; however, use a light sanding operation to prevent changing the taper angle. RED THREAD 11A Pipe Sr Fittings SECTION 8 ♦ Repair Procedures Note: Use of solvent does not remove ultraviolet degrada tion. COUPLINGS OR INTEGRAL BELLS WITH T.A.B. THREADS THAT HAVE BEEN OVEREXPOSED MUST BE REPLACED. 1.8.2 Pipe Patching Follow these instructions to repair pipe wall damage where the damaged area is two inches (50 mm) or less in diameter. 1. Cut a length of good pipe long enough to adequately cover the damaged area and extend at least three inch- es (75 mm) (and preferably four inches/100 mm) to ei- ther side of the damaged area (see Fig. 1.8.1). Ik P—��+�:r. Patch Damage FIGURE 1.8.1 2. Slit this "patch" lengthwise twice and remove a section so that about three-fourths of the circumference re- mains (see Fig. 1.8.2). FIGURE 1.8.2 3. Thoroughly sand the inner surface of the patch and sand a corresponding area on the pipe around the damaged section (see Fig. 1.8.3). Use coarse sandpaper, a file, or a disc sander to remove all gloss from the sur- faces to be bonded. FIGURE 1.8.3 4. If solvent is used to clean all bonding surfaces, allow the solvent to evaporate, then apply a thick coating of adhesive to both surfaces, snap the patch in place, and apply pressure with hose clamps or banding material until the adhesive hardens (see Fig. 1.8.4). The clamps 19