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.14 <br />Co -Flex, flexible piping, may be installed in a rockgard conduit or chase such as CPUC, <br />which can accommodate piping sweeps. The flexible pipe can be installed through the <br />conduit simply by pushing the pipe through or threading a cap with an "I" bolt to the pipe <br />termination fitting and attaching a pull rope or cord. Co -Flex may be installed within the <br />rockgard conduit or chase prior to installation. <br />If direct buried, Co -Flex pipe routing may require "Crossover Supports", to prevent <br />chafing at the point of intersection of each pipe run. Crossover junctions of the piping <br />runs may also be necessary to maintain dispenser product sequence. <br />PIPING TRENCHES: <br />Trenches should be have a minimum of one and one half pipe or rockgard conduit <br />diameter spacing between each pipe run and trench wall. <br />Piping systems requiring "fall" should have a minimum of 1% or 1/8" per linear foot <br />from pipe run termination point back to the tank or low point for monitoring purposes. <br />Please see P.E.I. RP 100-97 for additional sloping information. <br />The recommended backfill and trench bed material is rounded pea gravel 1/8" to 3/4" in <br />diameter. Clean sand may be used. Do not use sharp or rough edged aggregates as they <br />may damage or cut pipe jacket. Be sure there are no sharp objects left in piping trench. <br />A 6" bed of recommended backfill material, free from any debris, is placed in the piping <br />trench prior to installation. <br />Direct bury Co -Flex piping installed under reinforced concrete surfaces of a minimum of <br />4" (100mm) thickness require a minimum cover of 6" (150 mm) of the recommended <br />backfill material. <br />Asphalt, 2" (50mm) minimum thickness, requires 10" (250 mm) minimum cover of the <br />recommended backfill material. <br />