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12 Repair procedures Repairing non-contained primary piping <br /> Refer to Ameron 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'h-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 /> When using wing-nuts to close the primary repair <br /> coupling,align the wings exactly parallel with the line to <br /> 1 maintain the clearance necessary to permit the 4-inch <br /> containment pipe to slip over the 2-inch repair coupling. <br /> Make this alignment before the adhesive cures. <br /> L---------------------� <br /> 4 x 3 inch reducing <br /> couplings <br /> / 2-inch repair coupling <br /> 0 <br /> 0 0 0 0 <br /> ____________ <br /> • ° 0 0 <br /> Fig.12-1.Refer to Bulletin 7501 for ° <br /> detailedprocedu2s which mustbe ° ° ° <br /> followed for repaired primary piping to <br /> maintain its UL list/ng. 4-inch pipe \ Align wing-nuts parallel to pipe to permit <br /> i7 4-Inch pipe to slip over repair coupling <br /> P <br /> i <br /> Ir------------------- <br /> When repairing lines that have been in service and <br /> 1 that may contain flammable fumes,do not use 1 <br /> 1 electric drills or other tools which may constitute a <br /> spark hazard near the pipe.Use only air-driven or 1 <br /> 1 manual tools for cutting and sanding. 1 <br /> L------------------J <br /> i <br /> i <br /> • <br /> 17 <br />