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Flexible Underground Piping Manual environ 1 8.4 Pipe Trench Backfilling 9.1 Pipe Coupling Options Backfilling of the GeoFlex® Piping System should occur only There are three types of pipe coupling options available for the after the final integrity testing has been performed on both GeoFlex piping system.The first two are called coax couplings, primary and secondary pipes. Prior to backfilling completely, which is a double wall non-metallic pipe coupling that can be hand shovel the backfill material between and to the outside of used with both GeoFlex®-S (single-wall) and GeoFlex®-D the pipe to maintain the 2" (50mm) minimum required spacing (double-wall) piping. The third type is called swivel couplings, between the pipes and walls of the trench. Final backfilling shall which are made of stainless steel. All three types of couplings be done slowly and evenly so as not to disturb the spacing of are internally expanded onto the GeoFlex system using the the piping. An additional air test is recommended after backfill Environ coupling machine. to insure the backfill process has not damaged pipe. NOTE: barbed fittings do not require pipe couplings. NOTE: Use extra caution when backfilling around direct bury coax fittings. Avoid sharp impacts from backfill material and tools. 9.1.1 Coax Pipe Couplings-S This pipe coupling option is 8.5 Overburden connected to both GeoFlex-S and The type of surface installed above the piping can have an GeoVent piping. Having no exposed overloading effect on the flexible piping.Follow the overburden metal components, they can be specifications below for product warranty compliance. directly buried underground or contained inside a containment sump. These couplings will connect 8.5.1 Unpaved Surfaces with all coax fittings and adapters. If the surface is unpaved, then a minimum of 12" (300mm) of approved backfill material should be - sx- installed between the top of either ,1 _^ 9.1.2 Coax Pipe Couplings-D the GeoFlex, GeoVent"or GeoDuct" � This pipe coupling option is piping and the top of the ground - `" connected to only GeoFlex-D surface. 46 piping. Having no exposed metal ~ components, they can be directly buried underground or contained inside a containment sump. Their double wall design allows the 8.5.2 Asphalt Surfaces interstitial space of the GeoFlex-D If the surface is a minimum of 2" piping to pass through the coupling (50mm) of asphalt, a minimum of 6" as well as the interconnected coax (150mm) of approved backfill fittings and adapters. material should separate the top of - either the GeoFlex, GeoVent or GeoDuct piping from the bottom of 9.1.3 Swivel Pipe Couplings the asphalt. _ This pipe coupling is connected to both GeoFlex-S and GeoFlex-D piping. Made entirely of stainless steel, the fittings must always be contained inside a containment 8.5.3 Concrete Surface sump. These fittings,when coupled If the surface is a minimum of 4" to GeoFlex-D piping, rubber test boots, connector tubes and test (100mm) of reinforced concrete, a tubes should minimum of 4"(100mm)of approved backfill material should separate the secondary pipea testing and installed for top of either the GeoFlex,GeoVent or continuous monitoring capabilities. GeoDuct piping from the bottom of These couplings will interconnect with all swivel fittings and p p g adapters. the concrete. 9.2 Piping Application Options There are a variety of GeoFlex piping and containment options which may be used for a complete GeoFlex System. 9.0 GEOFLEX PIPING OPTIONS The GeoFlex Piping System offers several types of pipe coupling 9.2.1 Pressure Piping Systems options. These options, in turn, allow for a variety of piping For this type of piping system there are a variety of piping application options for the GeoFlex pipe used in both pressure applications available. They are described as follows: piping systems and suction piping systems. 10