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12Repair procedures Repairing non-contained primary piping <br /> Refer to Amercn Bulletin 7501 for detailed instructions concerning the repair of <br /> primary piping in non-contained systems. <br /> Repairing contained primary piping <br /> The 2-inch Dualoy repair coupling is sized so that it can be contained with 4-inch <br /> Dualoy 3000/L pipe.Thus,when repairing primary pipe contained within 3-inch <br /> standard containment pipe or 3'/z-inch containment pipe, replace the containment <br /> pipe with a 4-inch containment nipple. Join the 4-inch replacement nipple to the <br /> existing containment pipe with the appropriate reducing couplings. <br /> r--------------------� <br /> I When using wing-nuts to close the primary repair J <br /> coupling,align the wings exactly parallel with the line to I <br /> maintain the clearance necessary to permit the 4-inch <br /> containment pipe to slip over the 2-inch repair coupling. I <br /> Make this alignment before the adhesive cures. I <br /> L---------------------� <br /> 4 x 3 inch reducing <br /> couplings - <br /> �' - 2-inch repair coupling <br /> / ° <br /> ° O ° <br /> o a o____ n <br /> 0 0 ° ° <br /> Fig. 12-1.Refer to Bulletin 7501 for ° ° <br /> detailed procedures which must be ° ° <br /> followed for repaired primary piping to Align wing-nuts parallel to pipe to permit <br /> maintain its UL listing. 4-inch pipe 4-inch pipe to slip over repair coupling <br /> r------------------� <br /> When repairing lines that have been in service and I <br /> that may contain flammable fumes,do not use <br /> electric drills or other tools which may constitute a I <br /> spark hazard near the pipe.Use only air-driven or <br /> I manual tools for cutting and sanding. <br /> L------------------J <br /> 17 <br />