COMPLIANCE INFO_1999-2005 - Laserfiche WebLink

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SEC ♦ Repair Procedures 7. While the pipe is being checked for leaks, do not Note: Use of solvent does not remove ultraviolet degrada- stand at the end of theP�P� g 1 1n* system or where it tion. changes directions. CAUTION: Failure to strictly fol- low these instructions can result in serious personal COUPLINGS OR INTEGRAL BELLS WITH T.A.B.THREADS injury, death, and/or property damage. THAT HAVE BEEN OVEREXPOSED MUST BE REPLACED. 8. Smith Fiberglass Products recommends that after the 1.8.2 Pipe Patching piping has passed the 50 prig(0.345 MPa) pressure test, the contractor should reduce the product line pressure Follow these instructions to repair pipe wall damage to a pressure of not more than 25 psig (0.172 MPa) where the damaged area is two inches (50 mm) or less in and maintain this pressure until all paving has been diameter. completed. Leave pressure gauge on each line for in- spection. The contractor should check the gauge daily 1. Cut a length of good pipe long enough to adequately to verify that the pipe is holding pressure. cover the damaged area and extend at least three inch- es(75 mm) (and preferably four inches/100 mm) to ei- If a leak is encountered during the test procedure,im- ther side of the damaged area (see Fig. 1.8.1). 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. Patch arnage SE%:170N 8*REPAIR PROCEUVRES FIGURE 1.8.1 Vic► darnaged'pi e and for leaking joints, Smith Fiberglass Pliact recp�rfftends only the repair methods listed be- air damaged fittings. Always 2. Slit this "patch"lengthwise twice and remove a section sre�`test repair work before putting the line back into so that about three-fourths of the circumference re- etv to assure the soundness of the repaired section. mains(see Fig. 1.8.2). 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 FIGURE 1.8.2 When machined surfaces of pipe or fittings are exposed to direct sunlight prior to installation, the result is a loss of 3. Thoroughly sand the inner surface of the patch and joint bonding strength. Therefore, if protective coverings sand a corresponding area on the pipe around the have been removed and ultraviolet exposure was greater damaged section (see Fig. 1.8.3). Use coarse sandpaper, than one day, the following steps must be taken: a file, or a disc sander to remove all gloss from the sur- faces to be bonded. 1. For exposed spigot ends, cut X"to 1" (13 mm to 25 mm) off the end and retaper. This will remove the a weathered layer and give a fresh surface for bonding. For fittings with spigot ends, it is sometimes possible =;�Feiz to lightly sand the spigot using the same procedure as for bell ends. 2. For exposed bell ends (pipe or fittings), sand thor- FIGURE 1.8.3 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- 4. If solvent is used to clean all bonding surfaces, allow tric hand drill also works well; however, use a light the solvent to evaporate, then apply a thick coating of sanding operation to prevent changing the taper adhesive to both surfaces, snap the patch in place, and angle. apply pressure with hose clamps or banding material until the adhesive hardens (see Fig. 1.8.4). The clamps RED THREAD 11A Pipe br Fittings — 19 I