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In <br />10 <br />Pipe Routing <br />The type of pipe routing design selected is dependent on the quantity and <br />orientation of the dispensers, the type of system (either pressure or suction) <br />and the layout of the facility. One constant design requirement is that all <br />piping runs between containment sumps be continuous. Single and dual <br />piping lines may be used depending on the total quantity of dispensers to <br />16 <br />be serviced and the location and orientation of the islands. The pipe routing <br />design criteda for GeoFlex Piping System is considerably different than that <br />of conventlonal rigid piping. For either new or retrofit installations good pre- <br />installation planning Is a must to Insure a proper and hydraulically efficient <br />Installation. <br />Design Criteria <br />When designing and Installing GeoFlex Piping Systems use the following design <br />criteria to insure that the piping system meets Environ's requirements: <br />1. Flexible piping turns should not be less than an 24' (450mm) bend <br />radius. Piping trenches <br />5. For a pressure piping system using single piping runs routed in <br />should be cul with sweeping turns. <br />series, no <br />more than a total of six dispensing nozzles should be serviced with a <br />2. Foriflexiible in systems which have piping crossovers, install <br />piping Y PP <br />1-1/2 single piping line to prevent unacceptable product flow rates. <br />9 the <br />Crossover Supports at each Intersection. <br />6. If GeoFlex Piping is used for vent lines, make sure there is adequate fall <br />3. All flexible piping runs should be continuous, each beginning and ending <br />back to the tank from the vent stack. <br />within a containment sump. <br />7. The dispensing product sequence will alternate from one dispenser to the <br />4. It is not necessary to have continuous fall back to the tank for pressure <br />type piping systems which are routed in series if <br />next when 'loop -Grounds' are used, Pipe Crossovers are recommended <br />at these points to correct the change in product sequence in "series" <br />the Liquid Interstitial <br />Monitoring System is installed. <br />routing of pressure piping systems. <br />Series Routing <br />For "Pressure Piping Systems" the most effective routing design for flexible piping is "series routing". which means directly interconnecting the underground <br />storage tank to the dispensers by running from one dispenser to the next, without Interruption. The example layout below shows two methods of "series routing'. <br />Single Piping Lines <br />Dual Piping Lines <br />