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• Avoid personal contact with the piping system while it is Silt the "patch" longthwise pressurized during testing except for ach,al checking Of twice and remove a section so the joints for leaks. Absolutely no one should be in the that about three-fourths of the trench while the pipe is being initially preeeurized for leak Circumference remains. testing. Notify all site personnel before beginning the Thoroughly sand the Inner testing procedure. surface of the patch and sand a corresponding area on the pipe • Do not straddle the pipe during testing or while checking around the damaged section. the piping system for possible leaks. Use coarse sandpaper, a file, or a disc sander to remove all • While the pipe is being checked for leaks, do not stand gloss from the surface to be at the end of the piping system or where it changes bonded. directions. If solvent Is used to clean all b ding surfaces, allow the solvent to evaporate then apply CAUTION. Failure to striotty follow these inotruotione oan a thick coating of adhesive to result in serious personal injury, death, and/or property both surfaces, snap the patch darnago. in place, and apply pressure L= with hose clamps or banding • After the piping has passed the 50 prig (0.345 MPa) material until the adhesive hardens, The clamps may be pressure teat, we recommend the contractor reduce the lett on or removed after curing. product line pressure to a pressure of not more than 25 Replace the protective mesh covering if the repair Is made psig(0.172 MPa)and maintain this pressure until all paving on 2"pipe. has been completed. Leave pressure gauge on each line for inspection. The contractor should check the gauge Repairing Extensive Damage daily to verify the pipe is holding pressure. When the damaged area in the pipe wall is larger than two If a leak is encountered during the test procedure,immediately riches(50 mm)In diameter,follow these Instructions: release all pressure in the piping system and refer to page 1 for proper repair procedures. Upon completing any necessary For 2" pipe, cut the protective mesh covering and slide repairs to the piping system,follow the proper testing sequence away from damaged area. and verify the system's integrity_ When damage is local (less than two inches/50 mm long but more than two Inches/50 mm around the circumference Vaouum or inert Gas Teat Pr000duroo of the pipe), check to sae if there Is enough slack In the Testing with vacuum and/or pressurized inert gases have been pipe to cut out the damaged section_ if so, cut out the successfully used with our piping systems. Although helium damaged section,reteper the cut grids,and bond a sleeve testing in a closed atmosphere and at measured levels Is useful, coupling between the tapered ends. Make sure the joints testing in the field with helium has shown inconsistencies when are locked up and fully cured before pressure testing the attempting to Identify leak location. repair. Do not use these testing procedures for Fled Thread IIA sec- If the pipe Is buried, excavate a working area large enough onderycontainment plping systems. Refer to page 17. to allow for tapering tool rotation. Taper the cut ends of the pipeline and Install the sleeve coupling. REPAIR PROCEDURES When damage is extensive (too large for replacement by a sleeve coupling), cut out the damaged section, taper For damaged pipe, NOV Fiber Glass Systems recommends the cut ends, and install two sleeve Couplings and a pipe only the repair methods listed below. DO NOT attempt to repair nipple. This procedure requires sufficient slack in the line ke the final joint by ilfttng the pipe(or moving the pipe damaged fittings_ Always pressure test repair work before to mato one side)to engage the bell and spigot joint. Therefore, putting the line back Into service to assure the soundness of the repaired section. Contact your local representative for It may be necessary to remove additional backfill from further Information. a buried line to allow the pipeline movement of several feet. During repair, the pipeline should not be under pressure, and — Out out the damaged section of pipe, the area to be repaired must be Clean and dry throughout the — Taper one end of a piece of pipe at least as long as procedure. the damaged section This taper will be uecd as a gauge.Out this nipple to the proper length in the Pipe patching following steps. Follow these Instructions to repair pipe wall damage where the damaged area is two inches(50 mm)or less in diameter: To determine the insertion length of the tapered ends, move one of the couplings to the side and use the end of the repair • For 2" pipe, cut the protective mesh covering and slide nipple made In the previous step to determine the dry fit Into away from damaged area. each bell. (NOTE: The dry fit must be very tight, i.e. use • Cut a length of good pipe long enough to adequately cover additional force to drive the joint together tightly enough that the damaged area and extend at least three Inches 5 It is difficult to separate.) The total length of the repair nipple mm) and preferably Is determined by adding these two measurements to the four inches (100 distance between the sleeve couplings and then adding the mrn)to either side of two make-up dimensions from Table 9. the damaged area. Patch—+® 11