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6 Piping system layout • Grade the trench bottom with at least 6 inches of select backfill to provide firm, <br /> (cont'd.) even support for the pipe.Compact the subgrade well to prevent differential <br /> settling. <br /> • Protect the pipe from impact during backfilling and abrasion during operation by <br /> surrounding it with four to six inches of select backfill such as washed sand,pea <br /> gravel(3/4-inch maximum)or crushed stone(1/2-inch maximum). <br /> • Wrap pipe lying near concrete with rubber or foam padding to avoid direct contact <br />( with the concrete. <br /> a <br /> None p <br /> Asphalt <br /> 2(min) <br /> Concrete - <br /> 4(min) <br /> - - 16(min) <br /> Fig.6-1.During layout,bonding and S min <br /> inspection,support the piping on ( ) <br /> 2x4"batter boards"to keep the <br /> joints clean and to keep bedding <br /> out of the pipe. <br /> 4(min) <br /> Fig.6-2.Use only select materials for Select backfill - 6(min) <br /> bedding and backfilling Dualoy <br /> 3000/LCX fuel handling systems.Native <br /> materials are rarely suitable and should Native a(min) 6(min) <br /> not be used. soil <br /> Supporting valves,accessories and vent lines <br /> Do not use fiberglass pipe to support the weight of heavy items in a line such as valves, <br /> strainers and steel vent riser pipes.Provide separate supports for valves and <br /> accessories. <br /> 0 <br /> Permanent <br /> structure <br /> O <br /> Fig.6-3.Support risers by attaching <br /> them directly to structure walls. <br /> Steel pipe clamp <br /> Steel nipple <br /> / Steel <br /> Steel riser .L coupling <br /> I Bell x male <br /> Steel elbow adapter <br /> Dualoy3000/L fiberglass pipe �> <br /> O <br />