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IN Undergr Piping _m Fk?,* 1OQ R KS 6Y OPW FUELING CONTAINMENT SYSTEMS 9.1 Swivel Couplings&Fittings type of piping connections shall be made inside the tank These piping connections are made of stainless and protect- sump. ed steel featuring a swivel nut connection with a Viton gas- NOTE:Prior to assembling plumbing trees,be sure the ket seal.Swivel fittings require the use of the Flex Coupling OPW fittings are aligned with the pipe entries through Machine to install the pipe couplings. the sump wall to prevent excessive bending of the pipe 9.2 Double Wall Swivel Pipe Couplings(DPC Series) within the sump. Double Wall Swivel couplings and fittings are of a double 11.1 Pressure Supply Systems wall design and are used to interconnect FlexWorks flexible For pressure piping systems,the flexible piping may be con- piping. These UU ULC listed stainless steel couplings must nected to the tank's submersible pump using pipe adapters, be contained within containment sumps and not directly fittings or a flexible connector.For this application,both sin- buried, gle and dual line connections may be made. The pipe connection system includes an internally expanded 11.1.1 Single Pipe Line To Pump Connections stainless steel coupling attached to the end of FlexWorks This application includes a plumbing tree assembly which pipe section.The swivel coupling has a smooth sealing face interconnects the submersible pump to a single flexible pip- fitted with a viton ring gasket.Double wall Swivel Couplings ing line.A typical pipe connection assem- eliminate the need for cutting backthe secondary jacket and bly would include a ball shut-off valve and rubber test boots.They have an integral interstitial access standard plumbing elbow installed be- port for connector and test tubes. tween the submersible pump and the pipe Please see FlexWorks publication DPC-0001,Installation In- adapter,as shown. structions for Double Wall Couplings(DPC)and Test Tubes(17T For swivel type piping connections,a and TCT). plumbing assembly fitted with a standard 10.0 INSTALLING ACCESS PIPE plumbing elbow fitting would be connected to a swivel or Access Pipe is a large diameter corrugated flexible piping barbed adapter. The arrangement accommodates the con- that adds additional protection to OPW-FCS's flexible piping nection of a swivel pipe coupling installed on the end of a and allows the pipe to be removed and replaced without flexible pipe section. excavation.Measuring and cutting Access Pipe should be 11.1.2 Dual Pipe Lines To Pump Connections done prior to measuring and installing the primary piping. This application includes a plumbing tree assembly which OPW recommends the installation of Access Pipe for all in- interconnects the submersible pump to two flexible piping stallations of flexible piping. lines.A typical connection assembly would include a tee fit- l0.1 Access Pipe Measuring ting or a"Y"adapter fitting fitted with a ball shut-off valve Prior to measuring for the Access Pipe,install the Access Pipe and two standard plumbing elbows as shown. entry boots into the sidewall of the dispenser sump.Referto The adapter is attached by first applying the specified thread the flexible entry boots installation manual for the proper sealant to the male pipe threads. Then hand tighten firmly installation procedures forthese entry boots.Measure the followed by two full turns with a pipe wrench. distance from the sump wall of the first sump to the sump For swivel type piping connections,a plumbing assembly wall of the second sump.Make sure to follow the contour of fitted with two standard plumbing elbow fittings would be the trench.Add 4.25"to this figure and transfer measure- connected to swivel or barbed adapter.This arrangement is ment to the Access Pipe. to accommodate the connection of swivel pipe couplings 10.2 Access Pipe Cutting installed on the end of two flexible pipe. Transfer measurement to the Access Pipe and make cut in 11.2 Suction Supply Systems the closest valley. For suction systems,all flexible piping connections are made 10.3 Access Pipe Connections directly into the tank.In this application typically a tank man- Insert the black stiffener into the Access Pipe,then insert the way cover would be fitted with a multitude of female thread- Access Pipe into the flexible boot from outside of the sump. ed tank fittings.These tank fittings should have pipe fittings, Be sure the edge of the Access Pipe is flush with the inside either standard plumbing elbows or capped tees installed face of the boot.After the Access Pipe has been positioned, and aligned facing the entry point of the flexible pipe sec- in5tall the band clamps around the boot.Repeat this same tions. installation procedure with the other end of the Access Pipe 11.2.1 Metallic Connections To Tank Fittings section. install the metallic pipe adapters into the pipe fittings to 11.0 TANK SUMP PLUMBING TREES accommodate the metallic pipe couplings installed to the The type of piping application used shall determine what end of the flexible pipe sections.