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Xlexible Underground Piping Manual FIE!)MORKS BY OPW FUELING CONTAINMENT SYSTEMS 12.0 DISPENSER SUMP PIPE CONNECTIONS 13.0 FLEXIBLE PIPE FABRICATION The plumbing connections required inside dispenser sumps After all plumbing trees have been installed inside the tank can be simple or complicated depending upon the plumbing sumps and riser assemblies installed into either the deep or requirements,dispenser size,and pipe entry locations.Pipe shallow dispenser sumps,fabrication and installation of the entries that are located considerably off the center line may flexible piping may proceed. require the use of flex connectors as riser pipes instead of IMPORTANT:Only currently certified contractors with a rigid steel riser pipes. valid factory training card are authorized to install OPW The type of piping application specified shall determine what piping. type of piping connections shall be made inside dispenser 13.1 Pipe Handling At Jobsite sumps. Care must always betaken when handling OPW flexible pip- 12.1 Riser Pipe Assemblies ing to prevent damage.It is recommended that the carton be Riser pipe assemblies are designed to interconnect one or placed in the sunlight several hours before measuring and two flexible pipe sections to the above ground product dis- cutting the pipe,so the pipe may relax for easier extension penser.At the top end they may or may not be fitted with a when measuring. shear valve and are typically mounted to a stabilizer bar.At WARNING:Do not drag,cut or scrape the pipe during in- the low end they may be fitted with either tee fittings or el- stallation to avoid damage to the external surface of the bow fittings.Refer to the following riser pipe options availa- piping.Use only OPW approved backfill materials. ble with OPW's flexible piping system. 13.2 Cold Weather Pipe Handling 12.1.1 Steel Pipe Riser Measuring: OPW's flexible piping can be installed in ambient tempera- Cutting the steel riser pipe to the proper length will allow the tures as low as zero degrees,provided that the flexible piping piping to enter the dispenser sump on a straight and level has been sufficiently warmed prior to unrolling.If the pipe is plane and in line with the tees,elbows and adapters.Improp- unrolled and straightened while it is warm,it will cool in a er riser length results in stress at the pipe fitting/pipe cou- straighter position making it easier to install.For cold weather pling connection.Please follow the steps noted below: installations where the ambient temperature is below 40°F(5° • Install the stabilizer bars in their proper position,per C),it is recommended that the piping cartons be placed in a OPW Stabilizer Bar Installation Instructions,which can be warm room for 8 hours directly prior to installation.If this is determined by the dispenser manufacturer's footprint for not possible,then a small hole should be cut in the top center the particular dispenser model. This will allow for proper of the lid of the carton for insertion of the nozzle of a conven- vertical alignment. tional hair dryer.For piping reels,place a tarp over the reel • Install the shear valve to the shear valve mounting plate and then insert the hair dryer nozzle directly into the end of and secure this to the stabilizer bar in accordance with the piping.If this pipe warming procedure is used,do not use the dispenser manufacturer's footprint. the first 12"of the pipe due to possible damage by the hair dryer. Depending on the ambient temperature,it may take • Install the entry boots in accordance with the OPW Entry up to an hourto warm the roll of piping sufficiently. Fitting installation instructions. 13.3 Flexible Pipe Measuring • Line up the center of the entry boot with the center of When measuring the distance between containment sumps the opening of the tee,elbow or adapter. or pans to determine the proper length of a flexible pipe sec- • Determine the length of the steel riser by measuring be- tion to be installed,it is important to considerthat the pipe is tween the bottom of the shear valve and the top of the flexible and will not be installed perfectly straight.A slight tee,then add 1-1/2"to that length prior to cutting the weaving of the pipe in the piping trench is recommended to NPT threads for each end of the riser. compensate for expansion and contraction. The recom- • Install the riser to the top of the shear valve with the use mended measuring and cutting procedures forthe flexible of soft set pipe dope that is approved for use with petro- piping are described below: leum products. 13.3.1 Direct Pipe Burial Applications • Install the tee,elbow or adapter to the bottom of the When measuring for direct burial of flexible piping,the meas- riser,positioning it properly to align with the entry fitting uring points will be from the face of one adapter/fitting to horizontally,with the use of soft set pipe dope that is the next. If swivel couplings and fittings are used,subtract 1" approved for use with petroleum products. to allow for the length of the two pipe couplings and cut the Reinstall the riser set up to the stabilizer bar and then piping to that length. If Swivel Bolt-On couplings(SBC)are make sure that the tee,elbow or adapter opening is on used,measure from the shoulder of one fitting to the shoul- center with the entry fitting opening on both the hori- der of the corresponding fitting and cut pipe to that length. zontal and vertical plane. 13.3.2 Access Pipe Burial Applications • Assure that the opening of the tees,elbows or adapters For Applications using Access Pipe,measurements must be are all on center with the entry fitting,on both the hori- taken through the Access Pipe to insure proper length.Feed zontal and vertical plane. the measuring tape through the Access Pipe and measure the