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Flexible Underground Piping Manual A FIE?AWOQ R KS BY OPVJ FUELING CONTAINMENT SYSTEMS 13.7 Installing Pipe Sections-Direct Burial(non-Access the following connection procedures for each type. Pipe) 14.1 Coupling Inspection Once the pipe has been measured and the couplings have Prior to connection,inspect coupling to make sure all rubber been installed,the pipe may be installed.This section discuss- O-rings are properly in place and seated inside the O-ring es the installation in a direct burial application.Refer to sec- grooves. Look for any dirt or damage to the O-rings which tion 13.8 for installation of the piping using Access Pipe. may have occurred during the coupling procedure. 13.7.1 Insert Piping Through Sump Wall 14.1.1 Fitting Inspection Take the pipe section to the trench and insert into the con- Remove the plastic protective cap from the fitting or adapter. tainment sump through the flexible entry boot. Make sure Inspect the fitting or adapter to be sure that it is free of sand the band clamp of the entry boot has been removed or suffi- or debris in the core area and on the threads. ciently loosened to permit the pipe to pass through the rub- 14.1.2 Hand Tightening of Swivel Nut ber boot. Tighten band clamps of the entry boots after the installation process has been completed.Forjunction sump When installing swivel couplings,hand tighten the coupling applications,repeat procedure for adjoining pipe sections. onto the OPW-FCS fittings until it is snug.With an OPWFCS swivel wrench,tighten the coupling nut 1/4 turn more or to 13.7.2 Pipe Connection 200 in/lbs.Do not allow the pipe to rotate while tightening. After the flexible pipe(s)have been inserted,attach pipe to The 1/4 turn procedure will prevent over tightening of the cou- fittings using the methods described in section 14.Inspect pling past the maximum 200 in/lbs. NOTE:Failure to follow the piping in the trench to make sure it is positioned properly this procedure may result in damage to the coupling gasket. in the trench between the containment sumps and there is 15.0 INTERSTITIAL TUBE ASSEMBLIES sufficient pipe weaving back and forth to allow for pipe ex- pansion and contraction. The Double Wall Swivel Couplings attached to the ends of the flexible supply pipe sections have threaded(1/8"NPT)inter- 13.8 Installing Pipe Sections-Access Pipe stitial access ports on their ferrule for connection to Intersti- Once the pipe has been properly measured,the couplings tial Tube Assemblies that come in various lengths.All tube have been installed and dust covers placed back on the cou- assemblies are fitted on each end with 1/8"NPT brass com- plings,the pipe is ready to be installed into the Access Pipe. pression fittings. Refer to Section 10 and OPW's Access Pipe installation in- 15.1 fest Tubes structions for details involving the proper installation of the Access Pipe. Test Tubes are connected to the Double Wall Swivel Cou- plings located within tank sumps and the last dispenser sump 13.8.1 Fishing Pipe through Access Pipe in a series piping run.These 36"(900mm)long tubing assem- Remove Access Pipe conduit from bles are used to provide a means of air pressure integrity test- entry boots.Attach the appropriate .__ ing of the pipe interstitial space after installation.They can be OPW bullnose to one coupling. 11 cut to any desired length.They are used as another means of Fish rope through the Access Pipe testing the interstitial space when installed inside a terminat- conduit and attach to bullnose. Pull ing dispenser sump.'When not used for testing purposes, or push flexible piping through Ac- they may be plugged or left open depending on the pipe cess Pipe conduit. interstitial monitoring application. Note:For installation tips and techniques see Access Pipe 15.2 Connector Tubes Installation Instructions. Connector Tubes are connected to the double wall swivel 13.8.2 Insert Pipe into Sump couplings located within dispenser sumps and are 12"long. Align the Access Pipe conduit/flexible piping with the Access Installed inside junction dispenser sumps,connector tubes Pipe entry fitting.Push piping through entry boot and attach are used to interconnect the interstice of one pipe section to coupling to the fitting using the methods described in sec- the next by bypassing the junction safety valve or other fit- tion 14. tings such as a"Tee". 13.8.3 Insert Access Pipe into Entry Fitting 16.0 VENT FLEXIBLE VENT PIPING Align the Access Pipe with entry fitting and push into place This flexible piping is used for the transmission of aromatic until Access Pipe bottoms out.Tighten corresponding band fuel vapors and is designed for direct burial of the pipe and clamps to 30 in.lbs. fittings without the requirement for secondary containment. The intended use for Vent is for venting vapors from an un- 14.0 PIPING CONNECTIONS derground storage tank to a remotely located vent stack. After all containment sumps have been interconnected with IMPORTANT:Vent is available in both 2"and 3"sizes and is all of the flexible pipe sections,all riser pipe assemblies and not intended for the transfer of fluids. test boots(if required)have been installed,then all piping connections may proceed.There is a different installation 16.1 Vent Connections procedure for each type of piping connection.Comply with The Vent piping system requires the use of standard cou-