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,Flexible Undergrou ng Manual FIE_2_*W RKS SY OPW FUELING GGNTAINMENT SYSTEMS NOTE:OPW recommends hydrostatic testing on all sumps after installation is complete to check for proper sealing Piping Expansion Characteristics of joints and connections. Pipe DescriptionVolume 17.4.1 Water Filling 1-1/2"Flexible Piping +0.0015 Gradually introduce water at the lowest point into the piping system and bleed off air at the highest point in the piping 2"Fiberglass Piping +0.00045 system through an open valve.The hydrostatic pressure ap- 1-1/2"Flexible Connectors +0.0060 plied should not exceed 60 psi. 17.4.2 Pressure Hold Inspection *Volume Increase=gallons per linear foot at 60 psi pres- Maintain pressurization for a minimum of one hour making sure. sure there is no drop in pressure.Significant temperature 19.0 INTERSTITIAL INTEGRITY TESTING changes can result in a pressure reading differential.During Prior to supply filling and periodically over the life of the flexi- the pressurizing period,inspect all piping connections for ble piping system,it is recommended that interstitial testing leaks. be used to ensure that the secondary containment is intact. 17.5 Supply System Filling 19.1 Air Pressure/Soap Testing After the supply piping system has been integrity tested and After the inner primary flexible pipe and piping connections connected to the product dispensers,filling of the pipe line have been integrity tested,the entire interstitial space of the may commence.There should be a controlled method for double wall pipe must remain connected and only then filling the supply line which provides an adequate means of should the outer containment jacket be integrity tested. removing air from the lines.Do not start pumps with empty lines,as it may damage the pipe and its connections.Small 19.2 Testing Assembly amounts of trapped air should dissipate under normal opera- Inside all tank sumps the test gauge is connected to the end tions.Make sure that the pressure rating of the submersible of the test tube.The test gauge assembly consists of an air pump does not exceed that of the maximum operating pres- gauge with a maximum 15 psi scale connected to a 1/4"brass sure of the pipe. tee fitting with a male 1/4"thread.The gauge threads directly 18.0 PERIODIC LINE LEAK DETECTION into female brass fitting of the test tubes.The test tube in the Local or federal regulations may require periodic fine leak terminating sump shall be capped with a.25"brass plug. detection tests be performed on the installed piping system. 19.3 Air Pressure Testing Testing requirements affect both suction and pressure piping Gradually pressurize the piping's interstitial space through systems.A typical requirement is that the piping lines must the test tube to no more than 10 psi.During the pressuriza- be tested on an annual basis at one and one half(1-1/2)times tionperiod,apply an air pressure soap test to the entire pip- the normal operating pressure. ing line. After testing,disconnect the air hose and lay the test The typical test method will require detection of 0.10 gallons tube down into the bottom of the tank sump. (.3785 liters)per hour with a 95%probability of detection and 20.0 FLEXWORKS SYSTEM MAINTENANCE a 5%probability of a false alarm. The FlexWorks System is designed to provide reliable under- The typical test procedure requires the piping be isolated ground fuel transfer and short-term secondary containment from the tank and the piping line pressurized to 1-1/2 times of leaked petroleum product_FlexWorks sumps and second- the normal operating pressure.A test apparatus which is con- ary containment pipes are not intended for long term storage netted to the piping line will then measure the bleedback of petroleum products.Liquid that accumulates in the sec- volume of the piping system.Acceptable bleedback volumes ondary containment system must be promptly removed and on different types of piping systemswill vary due to their in- properly disposed of.Operational third party approved liquid herent expansion and contraction characteristics.Therefore, sensors should be installed and maintained in each sump to modtfications in the testing procedures are required for pip- reliably indicate to the operator that liquid is present in the ing systems which have significant expansion and contrac- secondary containment system.Once a leak is detected,the tion characteristics.This characteristic is measured in the av- system must be shut down immediately and the source of erage volume increase,per linear foot under a standard test the leak must be repaired.All liquid must be thoroughly pressure. flushed and cleaned out of the secondary containment sys- 18.1 FlexWorks Piping Expansion Characteristics tem at once.Inspect all system components at least monthly for leaks or damage,and repair or replace any suspect com- FlexWorks Piping is a multi-layer reinforced smooth bore flex- ponent as necessary. ible pipe which demonstrates only minor expansion and con- 20.1 ROUTINE SUMP INSPECTIONS traction characteristics during pressurization and depressuri- zation,similar to that of fiberglass piping.These physical Visual inspections of all containment sumps and components characteristics reduce the affect on the"bleedback tolerant- should be made on a routine basis to check for damage,wa- es"permitting a more accurate testing procedure. ter infiltration or for any signs of leaking product.An elec- tronic or mechanical shut-off leak detection system is recom-