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RFCEIVED <br />Jk'Alli-01-1 <br />ENVIRONMENTAL HEALTH <br />DEE PARTMEl', T <br />LAYOUT AND PREPARATION <br />Before installing the secondary containment piping system, <br />review and verify the recommendations for proper installation <br />set forth previously: <br />Layout and Preparation (Refer to Installation Crew Size and <br />Organization) <br />Piping Layout, Pipe Trenches and Burial <br />Most of the standard procedures for installing a secondary <br />containment piping system can be handled by the same size <br />crew that would install a single-wall product piping system. <br />It is essential that each phase of an installation be evaluated <br />and the proper number of workers be assigned to assure an <br />efficient installation. <br />Scarfing Pipe <br />It is recommended that scarfing be done prior to placing the <br />containment pipe over the primary pipe. If scarfing was not <br />done prior to placing the containment pipe over the primary, <br />and the primary system is bonded, abrading the surface must <br />be done manually using 60 to 80 grit emery cloth or sandpa- <br />per. <br />The ends of the containment pipe that are to be joined to sec- <br />ondary containment fittings must be thoroughly scarfed for a <br />minimum length of 3 inches (75 mm) for Red Thread IIA and <br />11/2" (40 mm) for Dualoy 3000/L pipe. Refer to Installation In- <br />structions for scarfing tool. <br />Properly scarfed ends are most easily accomplished by using <br />the Models 2100 power toot with the proper mandrels. Preset <br />at the factory, the 2100 power tool can scarf 3" and 4" (75 and <br />100 mm) Red Thread IIA secondary containment pipe. With <br />the purchase of Dualoy mandrels, 3" and 4" (75 and 100 mm) <br />Dualoy pipe can be scarfed. <br />If the Model 2100 or 2102 power tool is not available, the ends <br />may be scarfed using the manual tapering tool in conjunc- <br />tion with a secondary containment scarfing adapter kit. This <br />kit consists of a special scarfing blade (approximately 4"/100 <br />mm long), scarfing blade holder, 1/8" Allen® wrench, and 3" <br />and 4" (75 and 100 mm) scarfing gauges, that are required to <br />set the tool tolerances. For Red Thread IIA pipe, the scarfing <br />adapter kit is easily adapted to the 2"-6" (50-150 mm) manual <br />tapering tool kit. Refer to tool Installation Instruction for tool <br />set up. <br />43 <br />