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Flexible Underground Piping Manual <br />3.0 FLEX PIPING CONNECTIONS <br />OPW-FCS offers three types of piping connection systems for <br />use with their flexible piping systems. These three different <br />piping connections can accommodate a wide variety of piping <br />designs, layouts and installation applications. <br />Coax Couplings & Fittings <br />These piping connections are made of a combination of glass <br />reinforced plastic and stainless steel featuring a double wall <br />design. Coax fittings require the use of the Flex Coupling <br />Machine to install the pipe couplings. <br />Swivel Couplings & Fittings <br />These piping connections are made of stainless and protected <br />steel featuring a swivel nut connection with a Viton gasket seal. <br />Swivel fittings require the use of the Flex <br />Coupling Machine to install the pipe 4h,couplings. <br />3.1 Coax Couplings & Fittings <br />Coax couplings & fittings are a double <br />wall design and are used to <br />interconnect FlexWorks piping. These <br />UL® listed composite couplings and <br />fittings permit the entire flexible piping <br />system, including riser pipes <br />to be secondarily contained, tested and <br />monitored. The coax <br />couplings & fittings are available in 1-1/2" and 2" sizes. <br />3.1.1 Coax Pipe Couplings <br />These couplings provide a means of <br />connection from OPW-FCS's flexible <br />piping to coax fittings and adapters. <br />Coaxial pipe couplings attach to a <br />flexible pipe section using the OPW- <br />FCS Coupling Machine. Each coupling <br />assembly includes a stainless steel <br />insert with two 0 -rings, ferrule with one O-ring, and a swivel <br />nut. Available for both single wall and double wall applications. <br />NOTE: Coax couplings require a different face plate to <br />be used with OPW-FCS's coupling machine than is <br />used with the swivel couplings. <br />3.1.2 Coax Pipe Adapters <br />F/e-*Vl/(0)R KS <br />BY OPIN FUELING CONTAINMENT SYSTEMS <br />These adapters are designed to connect one end of a flexible <br />pipe section fitted with a coax pipe coupling to a 2" NPT <br />threaded female coupling or fitting.The adapter has a 1/4" <br />threaded test port for future installation of coax test tube for <br />testing the interstitial space of the double wall piping. <br />3.1.3 Coax Connector Coupling <br />These connectors are designed to <br />connect two flexible pipe sections fitted <br />with coax pipe couplings. This is ideal when <br />using extra -long piping runs and when <br />connecting short lengths of flexible piping <br />together. They can be direct buried, so <br />containment sumps are not required. <br />3.1.4 Coax Tee Fitting <br />These tee fittings may be used in two <br />different applications. The first application <br />is to connect two sections of OPW-FCS's <br />flexible piping fitted with coax couplings to <br />a riser pipe. This application is used in any <br />configuration where connection of a <br />tee to a standard threaded riser pipe or flex connector is <br />needed. Connection to a threaded riser pipe requires the use <br />of a coax riser pipe adapter or riser jacket kit <br />described later in this publication. The <br />second application for coax tee fittings is to <br />branch three sections of flexible pipe. <br />3.1.5 Coax Test Cap <br />Coax test caps are used to test the <br />integrity of each primary & secondary pipe section. See <br />section 5.5 for more details. <br />3.1.6 Coax Elbow Fitting <br />These elbow fittings may be used in two <br />different applications. The first application is <br />to connect a section of OPW-FCS's flexible <br />piping fitted with a coax coupling to a riser <br />pipe or flex connector. This application is <br />used to terminate a piping run with a standard threaded riser <br />