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only after the final integrity testing has been performed on both the primary and the secondary of the pipe. Prior to backfilling completely, hand shovel the backfill material between and to the outside of the pipe to maintain the minimum required spacing between the pipes and walls of the trench. Final backfilling shall be done slowly and evenly in 4" to 6" layers as not to disturb the spacing of the pipe and to insure no voids are present in the backfill. An additional air test is recommended after backfilling to insure the backfill process has not damaged the pipe. NOTE: Use extra caution when backfilling around direct bury coax fittings. Avoid sharp impacts from backfill material and tools. 8.5 Overburden The type of surface installed above the piping can have an overloading effect on the flexible piping. Follow the overburden specifications below for product warranty compliance. CAUTION: FlexWorks piping and Access piping can be punctured by grade stakes or other sharp objects driven into the ground. The use of tracer tape or a schematic of the underground piping should be kept onsite and marked off prior to commencing any work that may damage the pipe. 8.5.1 Unpaved Surfaces If the surface is unpaved, then a minimum of 18" (457mm) of approved backfill material should be installed between the top of all flexible piping and the top of the ground surface. 8.5.2 Paved Surfaces If the surface is paved with either asphalt or concrete the total amount of pavement plus approved backfill material shall be a minimum of 18" (457mm) between the top of either the flexible piping and the top of the paved surface. 8.5.3 Access Pipe Burial Whether the surface is paved or unpaved with either asphalt or concrete then there shall be a minimum of 16" (406mm) between the top of the Access Pipe and the top of the paved or unpaved surface. 9.0 FLEX PIPING OPTIONS The OPW-FCS's Piping Systems offers several types of pipe coupling options. These options, in turn, allow for a variety of piping application options for the flexible pipe used in both pressure piping systems and suction piping systems. 9.1 Pipe Coupling Options There are two types of pipe coupling options available for the OPW-FCS's flexible piping system. The first is coax couplings, which are a double wall non-metallic pipe coupling that can be used with OPW-FCS's flexible piping. The second is swivel couplings, which are made of stainless steel. Both are internally expanded onto the OPW-FCS's flexible piping using the FlexWorks coupling machine. 9.1.1 Coax Pipe Couplings -Double Wall F/exW0R KS BY OPW FUELING CONTAINMENT SYSTEMS This pipe coupling option is connected to OPW-FCS's double wall piping. Having no exposed metal components, they are not susceptible to corrosion. Their double wall design allows the interstitial space of the double wall piping to pass through the coupling as well as the interconnected coax fittings and adapters. 9.1.2 Swivel Pipe Couplings This pipe coupling is connected to OPW-FCS's double wall piping. Made entirely of stainless steel, the fittings must always be installed inside a containment sump. These fittings, when coupled with double wall flexible piping, require rubber test boots, connector tubes and test tubes to be installed for secondary pipe testing and continuous monitoring capabilities. These couplings will interconnect with all swivel fittings and adapters. 9.2 Piping Application Options There are a variety of piping and containment options which may be used for a complete OPW-FCS flexible piping system. 9.2.1 Pressure Piping Systems For this type of piping system there are a variety of piping applications available. They are described as follows: Using Dispenser Sumps This application includes the use of a tank sump inter- connected with one or more dispenser sumps using flexible piping which may be directly buried or installed inside Duct chase piping. Because all fittings are contained, either coax or metallic couplings and fittings may be used. 9.2.2 Suction Piping Systems For this type of piping system, there are a variety of piping applications available. They are described as follows: Using Shallow Dispenser Sumps This application includes the use of a tank sump interconnected with a dispenser sump using double wall flexible piping which may be directly buried or contained inside the Access Pipe. All fittings are contained, therefore either coax or metallic couplings and fittings may be used. 10.0 INSTALLING ACCESS PIPE Access Pipe is a large diameter corrugated flexible piping that adds additional protection to OPW-FCS's flexible piping and allows the pipe to be removed and replaced without excavation. Measuring and cutting Access Pipe should be done prior to measuring and installing the primary piping. OPW-FCS recommends the installation of Access Pipe for all installations of flexible piping. Note: For installation of flexible piping in Access Pipe when using coax couplings, refer to section 13.8.4. 10.1 Access Pipe Measuring Prior to measuring for the Access Pipe, install the Access Pipe entry boots into the sidewall of the dispenser sump. Refer to the flexible entry boots installation manual for the proper installation procedures for these entry boots. Measure the distance from the sump wall of the first sump to the sump wall of the second sump. Make sure to follow the contour of the