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1 7 Dry fitting secondary containing short runs <br /> containment systems For primary runs under four feet in length,a standard 14-inch containment <br /> (cont.) and short pipe nipples can be substituted for 31/,inch containment piping. <br /> ' L<4n IN <br /> w it <br /> IFig.7-10.Contain short runs with a — — — <br /> I 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 contai <br /> this way a minimum 4-inch vertical clearance can be provided between th <br /> the length of c <br /> nipples at cro: <br /> I a Containmentry <br /> other She <br /> 45°elbow D+1 /x <br /> face-to-face c <br /> L ° ° between the s <br /> fittings plus 1' <br /> Fig.7-11. At crossovers and very short ° D order to allow <br /> In runs where even a containment half- space to mov, <br /> coupling cannot be included,cut the 4 ° containment) <br /> containment pipe so that aminimum <br /> min <br /> 3/cinch insertion depth in the working on th <br /> containment fittings is maintained. O This length wi <br /> insertion dept <br /> pipe in the coi <br /> Containmenttee fittings. <br /> Centralizers <br /> Centralizers are not required in Dualoy 3000/1-containment systems unlet <br /> detection lines have been specified by the owner.In such cases,contact <br /> availability. <br /> Take care not to allow stones and backfill to enter the annular space betw <br /> and containment as this may result in leaks. <br /> S <br />