COMPLIANCE INFO_2007-2011 - Laserfiche WebLink

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n 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. Fig. 9-3. Moderate damage can be repaired by cutting out a short length ofpipe and joining the ends with a complete coupling or a half -coupling. r ------------i Failure to restrict the maximum gap between pipe ends to 3 inches and i to provide a minimum 2 -inch insertion depth of pipe in the repair couplings nullifies the 1 1 UL listing mark. 1 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. Fig. 9-5. Repairs over 10 inches in length are made byjoining a replacement nipple to sound pipe with whole or half -couplings at each end. 14 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 12 inches in length, a single full-size, 14 -inch long coupling will provide the required 1 -inch pipe insertion at each end. • To make repairs greater than 12 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. • Follow the guidelines given for minor damage: abrade all bonding surfaces, coat all cut pipe ends with adhesive and observe spacing and insertion depth require- ments. 3 Apply adhesive to max Glued areas cut ends of pipe Square -cut pipe ends �— 1 min (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 12 inches in length, a single full-size, 14 -inch long coupling will provide the required 1 -inch pipe insertion at each end. • To make repairs greater than 12 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. • Follow the guidelines given for minor damage: abrade all bonding surfaces, coat all cut pipe ends with adhesive and observe spacing and insertion depth require- ments.