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oul ' Eng F10,AWOR KS By OPW FUELING CONTAINMENT SYSTEMS IMPORTANT:Before and after the cou- pling process,the supplied dust cover 6.2 Dual Series Routing 6.3 Direct Routing should be kept on the couplings.This pre- This system is used in This system is used in caution will lessen the possibility of dam- "pressure"systems where "suction"systems where one age• two piping lines interconnect piping line is directly con- NOTE: When installing swivel couplings,hand tighten the all the dispensers divided nected to only one dispenser coupling onto the OPW-FCS fitting until it is snug.With an equally. inlet. OPW-FCS Swivel Wrench,tighten the coupling nut 1/4 turn more or to 200 in/lbs.Do not allow the pipe to rotate during tightening.This procedure will prevent over tightening of the coupling past the maximum 200 in/lbs. 5.3 Test Caps These custom threaded plugs have a 1/4"NPT port in the end for attachment of an air gauge or a valve stem(not in- cluded).Test caps are used to test the integrity of each pipe section prior to installation. 5.4 Test Gauge Assembly 7.0 PIPING DESIGN CRITERIA This air gauge assembly provides a means of When designing and installing Flex piping systems,use the testing only the interstitial space of double wall following criteria to insure that they meet OPW-FCS's re- piping.These gauges connect to the end of the quirements: test tubes and have a maximum pressure rating 7.1 Piping Turns of 15 psi. 5.5 Fishing Bullnose Piping trenches should be cut with sweeping turns.Flexible piping turns require specific radii depending on the pipe Attaches to the end of a flexible pipe section in 1:;1diameter.Piping turns should not be less than; order to fish(push or pull)the flexible pipe sec- tion through the Access Pipe. Its rounded nose 0.75"-18"Radius provides an easy means of feeding the pipe 1.0"-18"Radius through the Access Pipe.The swivel bullnoses are fitted with 1.5"-24"Radius a metal eyelet for attachment of a plumber's fish.Available in 1-1/2"and 2"pipe sizes for attachment to both coax pipe 2.0"-3b"Radius couplings and metallic pipe couplings. 3.0"-72"Radius 6.0 PRE-INSTALLATION PLANNING 7.2 Piping Crossovers The type of pipe routing design selected is dependent on-the A minimum compacted layer of either 2"of approved pea quantity and orientation of the dispensers,the type of sys- gravel or crushed stone or 4"of approved sand backfill must tem(either pressure or suction)and the layout of the facility. separate each pipe. One constant design requirement is that all piping that runs 7,3 Piping Supply Capacity between containment sumps be continuous.Single and dual piping lines may be used depending on the total quantity of For a pressure piping system using single piping runs routed dispensers to be serviced and the location and orientation of in seriesr no more than a total of six dispensing nozzles the islands.The pipe routing design criteria for OPW-FCS's should be serviced with a 1-1/2"single piping line to prevent flexible piping system is considerably different than that of unacceptable product flow rates.Consult OPWFCS's custom- conventional rigid piping.For either new or retrofit installa- er service department for flow rate calculations. tions,good pre-installation planning is a must to insure a 7.4 Vent Piping Fall proper installation. If Vent Piping is used for vent lines,make sure there is ade- quate fall back to the tank from the vent stack.OPWFCS re- 6.1 Single Series Routing quires a minimum 1/8"per foot slope for all vent lines. This system is used in"pressure" 7.5 Product Sequence systems where one piping line inter- The dispensing product sequence will alternate from one connects all of the product dispens- dispenser to the next when"loop-around"is used.Pipe cross- ers. overs are recommended at these points to correct the change in product sequence in"series"routing of pressure piping systems.