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If the pipe is buried, excavate a between the sleeve cou- After the final nipple length working area large enough to plings. At this point, deter- is determined, cut the other allow for tapering tool rotation. mine the proper length of end of the nipple and taper Taper the cut ends of the pipe- the pipe nipple. This length it, making sure that the nip- line and install the sleeve cou- is the sum of the distance ple is on the tapering tool in plingusingtheprocedureshown between the two sleeve exactly the same position as in Figure 1.8.5. couplings, the insertion the first taper (which was length of the tapered ends, used to measure the inser- 2. When damage is extensive(too and an additional "wet" tion length). large for replacement by a make-up length to assure d. Clean all bonding surfaces sleeve coupling), cut out the joint lock up. using the joint cleaner pro- damaged section,taper the cut vided in the adhesive kits. ends, and install two sleeve To determine the insertion Allow the cleaner to evapo- couplings and a pipe nipple as length of the tapered ends, rate, apply adhesive to all shown in Figure 1.8.6. This move one of the couplings bonding surfaces,and insert procedure requires sufficient to the side and use the end the nipple into the line by slack in the line to make the of the repair nipple made in lifting the line or moving it to final joint by lifting the pipe(or the previous step to deter- one side. Pushing the pipe moving the pipe to one side) to mine the dry fit into each back into the line will push engage the bell and spigot joint. bell. (Note: The dry fit must the nipple into the bell. Therefore,it may be necessary to be very tight, i.e. use a 2 x 4 Make certain that all tapers remove additional backfill from a to drive the joint together are tightly locked.Be careful buried line to allow for pipeline tightly enough that it is diffi- not to cock the joint. movement of several feet. cult to separate.) The total 1.8.4 Leaking joints length of the repair nipple is a. Cutout the damaged section determined r adding these Any adhesive-bonded joints that of pipe. two measurements to the leak during pressure testing MUST distance between the sleeve BE REMOVED AND REPLACED. b. Taper one end of a piece of Follow the procedures shown for pipe at least as long as the couplings and then adding Figure 1.8.6 using two sleeve damaged section. When the two make-up dimen- g Bions from Table 1.8.1. couplings and a pipe nipple. tapering, carefully observe Up tapering the taperion completion of any neces- the position of the nipple This added length is needed sary repairs to the piping system, ng tool. This taper due to additional insertion follow the proper testing sequence will be used as a gauge. Cut which occurs because the to verify the system's integrity. this nipple to the proper adhesive acts as a lubricant. length in the following steps. (Caution:This additional inser- TABLE MAKE-UP DIMENSIONS(WET) c. When pipe is buried exca- tion will be greater if a tight, p p Pipe Size Make-up Dimension vate a working area large dry fit is not achieved when (in.) (in.) enough to allow for tapering measuring.It will also be dif- ferent for each size of pipe..) 2 1/8 tool rotation. Taper the cut p p �) 3 3/16 ends of the pipeline and 4 3/16 install the two sleeve cou- plings.Cure these joints and Example for 2" (51 mm) pipe: then measure the gap 2 x 1/8"= 1/4"(2 x 3 mm= 6 mm) Figure 1.8.4 Figure 1.8.5 Figure 1.8.6 22