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Flexible Underground 18.3.1 Air Pressurize the pressure rating of the submersible pump does not exceed A) Gradually apply air pressure into the flexible piping line. Do not that of the maximum operating pressure of the pipe. exceed sixty pounds per square inch (60 psi) or 416 kPa. 19.0 PERIODIC LINE LEAK DETECTION 18.3.2 Air Pressure Holding Local or federal regulations may require periodic line leak detection Maintain pressure for a minimum of three hours, making sure tests be performed on the installed piping system. Testing that there is no drop in pressure. requirements affect both suction and pressure piping systems. A typical requirement is thatthe piping lines must be tested on an annual Note: Significant temperature changes can result in a basis at one and one half(1-1/2)times the normal operating pressure. pressure reading differential. The typical test method will require detection of 0.10 gallons (.3785 liters)per hour with a 95%probability of detection and a 5%probability of a false alarm. 18.3.3 Air Pressure Holding for Coax The typical test procedure requires the piping be isolated from the tank PRE-BACKFILL Maintain pressure for a minimum of three hours. and the piping line pressurized to 1-1/2 times the normal operating POST-BACKFILL Maintain pressure for a minimum of three pressure.A test apparatus which is connected to the piping line will hours. then measure the bleedback volume of the piping system.Acceptable bleedback volumes on different types of piping systems will vary due 18.3.4 Test Tube Gauge Check to their inherent expansion and contraction characteristics.Therefore, modifications in the testing procedures are required for piping systems During pressurizing,check the reading on the test gauge which which have significant expansion and contraction characteristics.This should be connected to the Test Tube of the interconnected characteristic is measured in the average volume increase, per lineal interstitial line. Any increase in pressure will indicate a leak. foot under a standard test pressure. 18.3.5 Soap Test 19.1 GeoFlex Piping Expansion Characteristics During the pressurizing period, apply a soapy water solution to all piping connections and inspect for bubbles. GeoFlex Piping is a fiber reinforced smooth bore flexible pipe which demonstrates only minor expansion and contraction characteristics during pressurization and depressurization, 18.4 Hydrostatic Testing Procedures similar to that of fiberglass piping. These physical The recommended hydrostatic pressure integrity test procedure characteristics reduce the affect on the "bleedback tolerances" for the flexible supply piping is one and one half(1-1/2)times the permitting a more accurate testing procedure. normal operating pressure of the submersible pump, not to Piping Expansion Characteristics exceed sixty pounds per square inch (60 psi). Make sure the flexible pipeline is isolated from the underground storage tank Pipe Description Volume Increase and the above ground product dispenser when conducting this 1-1/2" GeoFlex Flexible Piping + 0.0015 test. All pressure testing should be conducted by qualified and experienced personnel. Do not attempt to disconnect couplings, 2" Fiberglass Piping + 0.00045 caps, or plugs unless the air pressure has been released. 1-1/2" Flexible Connectors + 0.0060 Environ recommends hydrostatic testing on all sumps after installation to check for proper sealing of joints and connection. *Volume increase=gallons per lineal foot at 60 psi.pressure 18.4.1 Water Filling Gradually introduce water at the lowest point into the piping 20.0 INTERSTITIAL INTEGRITY TESTING system and bleed off air at the highest point in the piping system Prior to supply filling and periodically over the life of the Geoflex through an open valve. The hydrostatic pressure applied should system, it is recommended that interstitial testing be used to not exceed 60 psi. ensure that the secondary containment is intact. 18.4.2 Pressure Hold Inspection 20.1 Air Pressure/Soap Testing Maintain pressurization for a minimum of one hour making sure After the inner primary flexible pipe and piping connections have there is no drop in pressure. Significant temperature changes been integrity tested,the entire interstitial space of the GeoFlex can result in a pressure reading differential. During the pipe must remain connected and only then should the outer pressurizing period, inspect all piping connections for leaks. containment jacket be integrity tested. The connections of the test boots are illustrated and explained in section 15.2 of this 18.5 Supply System Filling product manual. After the supply piping system has been integrity tested and 20.2 Testing Assembly connected to the product dispensers,filling of the pipe line may commence. There should be a controlled method for filling the Inside all tank sumps the test gauge is connected to the end of the test supply line which provides an adequate means of removing air tube.Thetest gauge consists of an air au ewithamaximum PPY P q 9 9 9 Y 9 9 from the lines. Do not start pumps with empty lines, as it may 15 psi scale connected to a 1/4" brass tee fitting with a male 1/4"thread. damage the pipe and its connections. Small amounts of trapped The gauge threads directly into female brass fitting of the test tubes.The air should dissipate under normal operations. Make sure that test tube in the terminating sump shall be capped with a.25"brass plug. 22