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�FCFIVED <br />Jk,A 17 2011 <br />ENVIRONMENTAL HEALTH <br />DEPARTMEIIJ <br />Piping Layout <br />Pre -installation of the secondary containment pipe is best <br />accomplished at the same time the product pipe is dry fitted <br />together. Typically, the length of Red Thread IIA containment <br />pipe should be 4" (100 mm) shorter than the primary pipe. For <br />Dualoy 3000/L, the pipe should be 2" (50 mm) shorter than <br />the primary pipe. <br />Warning: Fit all Red Thread IIA secondary containment con- <br />nections to assure the insertion is approximately 3" (75 mm). <br />Fit all Dualoy secondary containment connections to assure <br />the insertion is approximately 1" (25 mm) to 11/2" (40 mm). <br />Be sure the containment pipe is not inserted too far into the <br />containment fitting. None of the glossy O.D. of the pipe should <br />be seated in the containment fitting. <br />Containment Fittings <br />All containment fittings consist of two halves with flanges. The <br />bottom half has threaded inserts for ease of assembly. These <br />fittings are assembled with adhesive and 1/4-20 washer head <br />bolts that are furnished with the fittings. The required bolts are <br />supplied in small plastic bags. If extra bolts are required, they <br />can be purchased from your distributor or standard 1/4-20 x 1 " <br />long hex head bolts can be used. If standard bolts are used, <br />place a flat washer on the bolt before torquing. <br />The bonding surfaces of the containment fittings are pre - <br />sanded when manufactured. These surfaces should be fresh- <br />ened with emery cloth prior to bonding. Two-piece secondary <br />containment fittings must be joined using a greater amount of <br />adhesive (thicker adhesive layer) than is necessary for joining <br />tapered bell and spigot joints of product piping. <br />Red Thread IIA Containment Crossover Detail <br />When installing a secondary containment system, some prep- <br />aration is necessary if the closest possible separation of lines <br />is required. To minimize the overall change in elevation when <br />installing a containment crossover, it is necessary to shorten <br />one leg of the 45° containment elbow and the side outlet run <br />of the containment tee. These parts can be purchased or can <br />be field fabricated as noted below. <br />Refer to Table below for the maximum length that can be re- <br />moved and for the minimum nipple length of both product pip- <br />ing and secondary containment piping. <br />45 <br />