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Asphalt, 2" (50mm) minimum thickness, requires 10" (250 mm) minimum cover of the <br /> recommended backfill material. <br /> Unpaved surfaces require a minimum of 20" (300mm) cover of recommended backfill <br /> material. <br /> After pressure testing is complete, care must be taken to insure even distribution and <br /> packing of the backfill material around the piping during the back fill process. Hand <br /> shovel material around and over piping to insure correct spacing is maintained. Backfill <br /> slowly. It is recommended to maintain test pressures during back fill process. See test <br /> section. <br /> Additional care should be taken when initially filling the piping system to insure that all air <br /> is removed from the product piping prior to starting any pumps to prevent damage. Be <br /> certain that the operating pressure of the pumping system does not exceed the maximum <br /> operating pressure of the Co-Flex piping of 75 psi. <br /> Periodic testing of both the primary and secondary sections of the Co-Flex system may be <br /> performed at any time after installation. Periodic testing and/or re-tightening of the Direct <br /> Connection fittings may be performed at any time. <br /> Please see installation instructions for DMA, dispenser mounting assemblies, and Western <br /> Fiberglass, Inc. tank sumps for details on piping penetrations. <br /> MEASURING PIPE RUNS: <br /> Co-Flex piping is available in 250 ft or 1000 ft sections. It may be ordered by the foot if <br /> required. The greatest care is taken after manufacture to package and ship your piping to <br /> insure against damage. Do not drag Co-Flex along the ground, step or place heavy <br /> objects on top of the pipe. . <br /> Cold weather will affect the flexibility and fitting attachment. Leaving the pipe coils in the <br /> sun prior to installation will make them more pliable and easier to handle. In extreme cold <br /> weather, store the piping indoors, at room temperature before measuring, cutting and <br /> terminating. When installing the Direct Connection fittings, sump areas or pipe ends for <br /> termination may be heated prior to attachment. <br />