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0 0 <br /> Pipe installation Trench width <br /> (continued) A trench width should optimally allow six inches between trench wall and pipe. <br /> For multiple lines in the same trench,separate the pipes by at least four inches. <br /> ® T • . a Q , o QO ' <br /> l / C Q 4(min) Q <br /> 0 � <br /> a <br /> 18 min ------ ------------------------ O <br /> 4(min) <br /> i • Q <br /> The pipe should be completely surrounded with Sand,pea gravel or .! Q <br /> select backfill.Native soils should never beused 6(min) Crushed Stone <br /> as backfill.Optimaispacing between trench wall <br /> and pipe is 6 inches.M otmensicns in drawing �'=- - a•.;- =-- = -•`----' o-=- -0 <br /> (not to scale)are in inches. L <br /> Pipe protection <br /> Although fiberglass pipe has high strength properties, it must be protected <br /> against impact damage which is most likely to result either from improper <br /> handling or backfilling.Avoid impact damage to pipe when driving in locator or <br /> marking stakes. <br /> Sand, pea gravel or crushed stone(maximum size 1/2 inch(12 mm))are recom- <br /> mended as padding to protect the pipe from rock damage during backfill and <br /> against abrasion during operation. Four to six inches(100 to 150 mm)of proper <br /> backfill should surround the pipe.When the pipe is laid near or through concrete, <br /> it must be wrapped with rubber or foam padding to avoid direct contact, and <br /> the subgrade should be well compacted to prevent differential settling. <br /> Supporting valves and accessories <br /> When heavy items such as valves are used in a line,their weight must be <br /> supported separately. <br /> Connecting to fittings <br /> Avoid delays caused by not having the right fittings on hand by taking the time <br /> to lay out the job in advance.A diagram of the fittings layout will speed up the <br /> job and eliminate unnecessary rework. <br /> Flex connectors should be used whenr �; <br /> connecting pipe to dispensers(left)and turbines - - " -'"` <br /> (tight). The use o/"swingicints'•is not <br /> recommended. - `-' <br /> iw <br /> Jx. <br /> 1. <br />