Laserfiche WebLink
6 Piping system layout <br />(cont'd.) <br />Fig. 6-1. During layout, bonding and <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 />Fig. 6-2. Use only select materials for <br />bedding and backfilling Dualoy <br />3000/LCX fuel handling systems. Native <br />materials are rarely suitable and should <br />not be used. <br />Fig. 6-3. Support risers by attaching <br />them directly to structure walls. <br />• Grade the trench bottom with at least 6 inches of select backfill to provide firm, <br />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 />None► <br />Asphalt <br />2 (min) <br />Concrete <br />4 (min) <br />- 18 (min) <br />8 (min) <br />I <br />4 (min) O O O <br />i Select backfill 6 (min) <br />Native _/ 6 min <br />soil 4 (min) ( ) <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 />Steel pipe clamp �^ <br />\ I / Steel nipple <br />V/'A�I� <br />Steel <br />Steelriser cooupling <br />Bell x male <br />Steel elbow a- adapter <br />Dualoy3000afiberglass pipe <br />[] <br />