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lexibie Underground Piping FleacW(DRKS BY OPW FUELING CGNTAIIYMENT SYSTEMS plings&fittings.Unlike supply piping connections OPW per- with backfill material. mits Vent swivel connections to be direct buried when • All pipe coupling/swivel connections should be tight- properly protected. ened securely before testing. 16.2 Tank Connections Within Tank Sump • The interstitial(secondary)line should be interconnected If the tank's vent connection is contained within a tank sump, and fitted with an air gauge. the vent line should enterthrough an applied entry fitting.A All local building,safety and fire codes should be fol- male adapter fitting should be used to complete the connec- lowed prior to and during testing, tion within, 16.3 Tank Connections Extractor Fitting 17.3 Air Pressure Testing Procedures The air pressure integrity test procedure for the flexible sup- ply piping tank's vent connection isnot contained within a tank ply piping is one and one half(1-1/2)times the normal oper- sump,then amale or female adapter fitting should be in- ating pressure of the submersible pump,not to exceed sixty stalled in the extractor fitting to accept the OPW Piping.The pounds per square inch(60 psi).Make sure the flexible pipe- line is coupling/fitting should be properly protected. line is isolated from both the underground storage tank and 16.4 Pipe Branch Connections the above ground product dispenser when conducting this In between the beginning and end of a Vent piping line it test.All pressure testing should be conducted by qualified may be necessary to install tee fittings to interconnect nu- and experienced personnel.Do not attempt to disconnect merous pipe runs into a main return line to the tank. couplings,caps,or plugs unless the air pressure has been 16.5 Vent Stack Connections released. At the other end of a Vent'"`pipe line the pipe connects to a NOTE:Testing requirements must be in accordance with vent stack for tank vapor venting applications.This connec- all applicable codes. tion is made using an elbow fitted to the appropriate cou- 17.3.1 Air Pressurize pling.Metallic fittings may be wrapped with pipe tape to fur- Gradually apply air pressure into the flexible piping line.Do ther protect the fitting corn ponents from corrosion. not exceed sixty pounds per square inch(60 psi)or 416 kPa. 17.0 TESTING&FILLING SUPPLY PIPE NOTE: After the primary line pressure stabilizes,gradual- It is important to properly test the flexible piping prior to ly apply air pressure into the interstitial space of the flexi- backfiil to insure there are no leaks.The following test proce- ble piping line. Do not exceed ten pounds per square dures are provided as a guideline only and the manufacturer inch(10 psi)or 69kPa,making sure there is no drop in assumes no responsibility or liability for the consequences of pressure for a minimum of one hour. any testing practices. 17.3.2 Air Pressure Holding IMPORTANT:Integrity testing with air or gas can be danger- Maintain pressure for a minimum of one hour,or in accord- ous and it is very important that the proper testing equip- ante with the authority having jurisdiction(AHJ),making sure ment be used and that the pre-testing procedures be read. that there is no drop in pressure. 17.1 Testing Equipment NOTE:Significant temperature changes can result in a • Pressurizing equipment should be of sufficient size to pressure reading differential. accommodate line pressure testing requirements. 17.3.3 Test Tube Gauge Check • Pressurizing equipment should have controls to gradual- During pressurizing,check the reading on the test gauge ly increase pressures.. which should be connected to the test tube of the intercon- • Pressurizing equipment should be operated by experi- netted interstitial line.Any increase in pressure will indicate a enced and qualified personnel only. leak. • The pressure gauge should be located in close proximity 17.3.4 Soap Test to the pressurizing equipment. During the pressurizing period,apply a soapy water solution • Pressure gauges must have a full scale reading not to to all piping connections and inspect for bubbles. exceed twice the required test pressure. 17.4 Hydrostatic Testing Procedures(if applicable) • Pressure gauges should be accurately and routinely test- The recommended hydrostatic pressure integrity test proce- ed for reliability. dure for the Flexible supply piping is one and one half(1-1/2) 17.2 Pre-Testing Procedures times the normal operating pressure of the submersible pump,not to exceed sixty pounds per square inch(60 psi). • The underground storage tank should be isolated from Make sure the flexible pipeline is isolated from the under- the piping system prior to hydrostatic or air testing. ground storage tank and the above ground product dis- • Shear valves located under dispensers should be sealed penser when conducting this test.All pressure testing should with pressure rated plugs or caps. be conducted by qualified and experienced personnel.Do • Long flex piping runs should be secured at various points not attempt to disconnect couplings,caps,or plugs unless the air pressure has been released.