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5.6 Test Gauge Assembly This air gage assembly provides a means; of testing only the interstitial space of double wall piping. These gauges connect to the end of the test tubes and have a maximum pressure rating of 15 psi. 43 6.7 Fishing Bullnose Attaches to the end of a flexible pipe section in order to fish (push or pull) the flexible pipe section through the Access Pipe. Its rounded nose provides an easy means of feeding the pipe through the Access Pipe. The swivel bullnoses are fitted with a metal eyelet for attachment of a plumber's fish. Available in 1-1/2" and 2" pipe sizes for attachment to both coax pipe couplings and metallic pipe couplings. 6.0 PRE -INSTALLATION PLANNING The type of pipe routing design selected is dependent on the quantity and orientation of the dispensers, the type of system (either pressure or suction) and the layout of the facility. One constant design requirement is that all piping that runs between containment sumps be continuous. Single and dual piping lines may be used depending on the total quantity of dispensers to be serviced and the location and orientation of the islands. The pipe routing design criteria for OPW-FCS's flexible piping system is considerably different than that of conventional rigid piping. For either new or retrofit installations, good pre -installation planning is a must to insure a proper installation. 6.1 Single Series Routing 6.2 Dual Series Routing This system is used in This system is used in "pressure" systems where one "pressure" systems where two piping line interconnects all of piping lines interconnect all the the product dispensers. dispensers divided equally. 6.3 Direct Routing This system is used in -'suction" systems where _7..0 one piping line is directly connected to only one dispenser inlet. FZeXWORKS By OPIN FUELING? CONTAiNNIENT SYSTEMS PIPING DESIGN CRITERIA When designing and installing Flex piping systems, use the following criteria to insure that they meet OPW- FCS's requirements: 7.1 Piping Turns Piping trenches should be cut with sweeping turns. Flexible piping turns require specific radii depending on the pipe diameter. Piping turns should not be less than: .75" -18" radius 1.0" -18" radius 1.5" - 24" radius 2" - 36" radius 3" - 72" radius 7.2 Piping Crossovers For flexible piping systems which have piping crossovers, install the crossover supports at each intersection. 1-1/2" and 2" only. Note: When crossover supports are not available, a minimum compacted layer of either 2" of approved pea gravel or crushed stone or 4" of approved sand backfill must separate each pipe. 7.3 Piping Supply Capacity For a pressure piping system using single piping runs routed in series, no more than a total of six dispensing nozzles should be serviced with a 1-1/2" single piping line to prevent unacceptable product flow rates. Consult OPW- FCS's customer service department for flow rate calculations. 7.4 Vent Piping Fall If Vent Piping is used for vent lines, make sure there is adequate fall back to the tank from the vent stack. OPW- FCS requires a minimum 1/8" per foot slope for all vent lines. 7.5 Product Sequence The dispensing product sequence will alternate from one dispenser to the next when "loop -around" is used. Pipe crossovers are recommended at these points to correct the change in product sequence in "series" routing of pressure piping systems. 8.0 PIPE BURIAL REQUIREMENTS OPW-FCS's flexible piping and access piping are strong, yet still flexible, piping systems and must be buried in such a manner that they will not compress.The burial requirements depend on proper pipe trenching, backfill material and burial depth. Follow these instructions for warranty compliance: 8.1 Trench Sizing Piping trenches should be dug in such a manner that the trench width is equal to at least twice the width of all the flexible pipes contained within. All piping within the trench should be separated by the