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0 <br /> e <br /> Dry fitting secondary containing short nuns <br /> containment systems For primary runs under four feet in length,a standard 14-inch containment coupling <br /> (cont.) and short pipe nipples can be substituted for 3'h-inch containment piping. <br /> L< 4e <br /> 14 -•- e l <br /> Fig.7-10.Contain short runs with a <br /> standard containment coupling and <br /> short containment pipe nipples. <br /> Containing crossovers and very short runs <br /> Make crossovers by using 45°elbows and tees in both primary and containment.In <br /> this way a minimum 4-inch vertical clearance can be provided between the lines.Limit <br /> the length of containment <br /> Containment Anipples at crossovers and <br /> 45•elbow �,,';, 0+1112 other very short runs to the <br /> ` \ face-to-face distance <br /> O /`y between the secondary <br /> fittings plus 1'h inches in <br /> Fig.7-11. At crossovers and very short - p order CO allow sufficient <br /> runs where even a containment half- �j space to move the <br /> coupling cannot be included,cut the / <br /> containment pipe so that a minimum min containment nipple while <br /> 3la-inch insertion depth in the t working on the primary. <br /> containment fittings is maintained. This length will provide an <br /> + insertion depth of%inch of <br /> pipe in the containment <br /> Containment tee fittings. <br /> Centralizers <br /> Centralizers are not required in Dualoy 3000/L containment systems unless in-pipe <br /> detection lines have been specified by the owner.In such cases,contact Ameron for <br /> availability. <br /> Take care not to allow stones and backfill to enter the annular space between primary <br /> and containment as this may result in leaks. <br /> 8 <br />