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9 Repair procedures • Center the coupling around the gap in the pipe. (cont.) • Abrade all bonding surfaces before applying adhesive. • Coat the cut ends of the pipe and bonding surfaces with adhesive,then bolt the coupling halves together. 3 Apply adhesive to max cut dnds of pipe Glued areas A Fig.9-3.Moderate damage can -- --be repaired by cutting out a short length o/pipe and joining the ends with a complete coupling ora half-coupling. 2 min Square-cut pipe ends r (not tapered) Half-coupling (full coupling optional) Major damage(over 3 inches in length) Damage in which more than three inches of pipe must be removed is considered major.Major damage is typically caused by excavation equipment or large objects striking the pipe.Repair major damage with a replacement nipple and one or more repair couplings. • For damage less than 10 inches in length,a single full-size,14-inch long coupling will provide the required 2-inch pipe insertion at each end. • To make repairs greater than 10 inches in length,use two full-size or half- couplings to join the replacement nipple with the existing line as shown In Fig.9-5. r 7 • Follow the guidelines given for minor damage:abrade all bonding Failure to restrict the maximum gap I surfaces,coat all cut pipe ends with adhesive and observe spacing and between pipe ends to 3 inches and I insertion depth requirements. to provide a minimum 2-inch insertion depth of pipe in the repair No 3<Repair area<10 —> couplings nullifies the UL listing mark. I Glued areas L------------J Fig.9-4.Major damage is repaired by removing the damaged pipe.Affected areas under 10 inches in length are repaired using a full-length coupling to hold a pipe nipple. 3 max 2 min —► 9aP Full coupling Repair area>10 Fig.9-5.Repairs over 10 inches in Glued areas — — 3 max length are made by joining a replacement nipple to sound pipe with whole orhalf-couplings at each end. )) 2min —►I Hall-coupling 14 --_V