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Flexible • - • • Piping Manual environ 11.2 Suction Supply Systems flexible pipe sections to the above ground product dispenser. At For suction systems, all GeoFlex the top end they may or may not be fitted with a shear valve and piping connections are made directly x ° °`O ° are typically mounted to a stabilizer bar. At the low end they into the tank. In this application r"�`° ° may be fitted with either tee fittings or elbow fittings and be typically a tank manway cover would ° ° contained or non-contained, depending on the piping be fitted with a multitude of female application. Refer to the following riser pipe options available G `c with the GeoFlex system. threaded tank fittings. These tank ° C fittings should have pipe fittings, I� C either a street elbows or capped tees 12.2 Non-Contained Riser Pipe installed and aligned facing the entry point of the flexible pipe sections. Non-contained riser pipe assemblies are only permitted if they are to be installed inside dispenser sumps. These riser pipes 11.2.1 Coax Connections To Tank Fittings assemblies may have a coax, swivel or barbed tee or elbow Install the coax pipe adapters into the fitting installed at the base of the steel riser pipe. pipe fittings to accommodate the `" NOTE: If coax fittings are installed,then a riser seal kit coax pipe couplings installed to the should be used to seal-off a steel riser pipe to the top end of the flexible pipe sections.The of a coax fitting for direct burial applications. adapters are attached by first 1�r applying the provided thread sealant r to the male pipe threads.Then hand --- tighten firmly followed by two full ? turns with aPiP e wrench. .. -_ - 71 4- NOTE: For coaxial fitting NPT threads, use only UL®classified thread sealant w specifically formulated for gasoline and petroleum " products. Do not overtighten coax type fittings. 11.2.2 Metallic Connections To Tank Fittings Install the metallic pipe adapters into * � U the pipe fittings to accommodate the 12.3 Contained Riser Pipes w/Shear Valve Adapters metallic pipe couplings installed to p p the end of the flexible pipe sections. This contained riser pipe assembly may be installed inside a ,. dispenser sump, under a dispenser pan or without any dispenser containment. Rigid steel riser pipes are fitted with the riser jacket kits for secondary containment and dielectric isolation. They use shear valve adapters to seal-off to the top end to an outside base threaded shear valve.These types of riser pipe assemblies may be fitted at their lower end with only a coaxial tee or elbow fitting depending on the application. 12.0 DISPENSER SUMP PIPE CONNECTIONS The installation steps for this riser pipe assembly are as follows: The plumbing connections required inside dispenser sumps can be simple or complicated depending upon the plumbing requirements, 12.3.1 Riser Pipe Fabrication dispenser size, and pipe entry Determine the length of the steel pipe considering piping fall locations. Pipe entries that are back requirements and the required elevation point of the located considerably off the center flexible pipe section. Cut and thread the ends of the pipe with line may require the use of flex NPT threads. connectors as riser pipes instead of the standard rigid steel riser pipes. For some dispenser models, the pipe entries are located so close to the wall of the dispenser that product offsets are 12.3.2 Installing Riser Jacket Kit required. The type of piping application specified shall determine what type of piping connections shall be made inside For secondary containment of the dispenser sumps. steel riser pipes located under the product dispensers, follow these NOTE: Prior to all Geoflex piping connections in installation steps. dispenser sumps the riser pipe assemblies must be installed and test boots, if used, must be installed. 12.1 Riser Pipe Assemblies Riser pipe assemblies are designed to interconnect one or two 13