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0 <br /> Dry fitting secondary Containing crossovers and very short runs <br /> containment systems Make crossovers by using 45°elbows and tees in both primary and containment.In this <br /> (cont.) way a minimum 4-inch vertical clearance can be provided between the lines.Limit the <br /> length of containment <br /> Containment A nipples at crossovers and <br /> 45°elbow o+t'12 other very short runs to the <br /> face-to-face distance <br /> between the secondary <br /> _ fittings plus 1'k inches in <br /> 0 order to allow sufficient <br /> Fig.7-5. At crossovers and very short \ space to move the <br /> runs where even a containment half- 4 containment nipple while <br /> coupling cannot be included,cut the <br /> containment pipe so that a minimum Working on the primary. <br /> 3/e-inch insertion depth in the This length will provide an <br /> containment(rt rigs is maintained. insertion depth of 3/a inch of <br /> Containmenttee pipe in the containment <br /> fittings. <br /> Centralizers <br /> Centralizers are not required in Dualoy 3000/1-containment systems <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 /> Vent piping <br /> Do not use fiberglass pipe to support <br /> the weight of heavy items in a line PermanentApipe <br /> I <br /> such as valves,strainers and steel structure <br /> Fig.7-6 Support risersbyattaching <br /> them directly to structure walls. riser pipes.When containing vent <br /> piping,do not use fiberglass vent or Steel pipe da <br /> containment piping to support the <br /> steel riser pipes:the weight of the <br /> steel risers may prevent good bonds <br /> in the fiberglass lines and result in St <br /> leaks.Support the risers by <br /> attaching them directly to structure Dualoy 3000/1- <br /> walls. 11 <br /> 7 <br />