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M tiid 0 0 Testing Equipment Pipe System Testing • Pressurizing equipment should be of sufficient size to accommodate line pressure testing requirements. The following test procedures are • Pressurizing equipment should have controls to gradually increase pressures. provided as a guideline only and the Pressurizing e q p y manufacturer assumes no g quipment should be operated by experienced and qualified personnel only. responsibility or liability for the • The pressure gauge should be located in close proximity to the pressurizing equipment. consequences of any testing practices. • Pressure gauges must have a full scale reading not to exceed twice the required test pressure. Pre -Testing Procedures Warning Integrity testing with air or can be • The underground storage tank should be Isolated from the piping system prior to hydrostatic testing. • Shear gas dangerous and It Is very important that the valves or riser pipes located under dispensers should be sealed with pressure rated plugs or caps. • Long flex piping runs should be secured at various proper testing equipment be used points with backfill material. and that the pre -testing procedures be read. • All pipe coupling/swivel connections should be tightened securely before testing. • The interstitial (secondary) line should be interconnected and filled with an air gauge. • All local building, safety and fire codes should be followed prior to testing. Air Pressure Testing Procedures The air pressure integrity lest Procedure for the flexible supply piping is one and one half (1-1/2) limes the normal operating pressure of the submersible Pump, not to exceed sixty pounds per square inch (60 psi). Make sure the flexible pipeline is isolated from both the underground storage tank and the above ground product dispenser when conducting this test. All pressure testing should be conducted by qualified and experienced personnel. Do not attempt to disconnect couplings, caps, or plugs unless the air pressure has been released. • Gradually apply air pressure into the flexible piping line. Do not exceed sixty pounds per square inch (60 psi). • Maintain pressure for a minimum of three hours making sure that there is no drop in pressure. Note: Significant temperature changes can result in a pressure reading differential. • During pressurizing, check the reading on the Test Gauge which should be connected to the Test Tube of the interconnected interstitial line. Any increase in pressure will indicate a leak in the primary supply line. • During the pressurizing period, apply a soapy water solution to all piping connections and Inspect for bubbles. Supply System Filling After the supply piping system has been integrity tested and connected to the Product dispensers, filling of the pipe line may commence. There should be a controlled method for filling the supply line which provides an adequate means of removing air from the lines. Do not start pumps with empty lines, Test Requirements Local or federal regulations may require periodic line leak detection tests be performed on the installed piping system. Testing requirements affect both suction and pressure piping systems. A typical requirement is that the piping line must be tested on an annual basis at one and one half (1-1/2) times the normal operating pressure. 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. The typical test procedure requires the piping be isolated from the lank and the piping line pressurized to 1-1/2 times the normal operating pressure. A test apparatus which is connected to the piping line will then measure the 4leedback volume of the piping system. Acceptable bleedback volumes on different types or piping systems will vary due to their inherent expansion and contraction characteristics. Therefore modifications In the testing procedures are required for piping systems which have significant expansion and sontraction characteristics. This characteristic is measured in the average volume increase, per lineal foot under a standard test pressure. Hydrostatic Testing Procedures The recommended hydrostatic pressure integrity test procedure for the flexible supply piping is one and one half (1-1/2) limes the normal operating pressure of the submersible pump, not to exceed sixty pounds per square inch (60 psi). Make sure the flexible pipeline is isolated from the underground storage lank and the above ground product dispenser when conducting this test. All pressure testing should be conducted by qualified and experienced personnel. Do not attempt to disconnect couplings, caps, or plugs unless the air pressure has been released. • Gradually introduce water at the lowest point into the piping system and bleeding off air at the highest point in the piping system though an open valve. The hydrostatic pressure applied should not exceed 60 psi. • Maintain pressurization for a minimum of one hour making sure there is no drop in pressure. Note: Significant temperature changes can result in a pressure reading differential. During the pressurizing period inspect all piping connections for leaks. BE CAREFUL WHEN DOING PRESSURE TSSIING . 'I[ as it may damage the pipe and its connections. Small amounts of trapped air should dissipate under normal operations. Make sure that the surge or pulsation pressure rating of the submersible pump does not exceed that of the maximum operating pressure of the pipe, which is 75 psi. Geci Piping Expansion Characteristics GeoF/ex Piping is a fiber reinforced smooth bore flexible pipe which demonstrates only minor expansion and contraction characteristics during pressurization and depressurization, similar to that of fiberglass piping. These physical characteristics reduce the affect on the •bleedback tolerances' permitting a more accurate testing procedure. Piping Expansion Characteristics Pipe Description 'Volume Increase 1-1/2" GeoFlex Flexible Piping +0.0015 2" Fiberglass Piping +0.00045 1-1/2" Flexible Connectors +0.0060 'Volume Increase = gallons per lineal toot at 60 psi pressure