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20.0 INTERSTITIAL INTEGRITY TESTING Prior to supply filling and periodically over the life of the flexible piping system, it is recommended that interstitial testing be used to ensure that the secondary containment is intact. 20.1 Air Pressure/Soap Testing After the inner primary flexible pipe 000001 and piping connections have been integrity tested, the entire interstitial space of the double wall pipe must remain connected and only then should the outer containment jacket be integrity tested. The connections of the test boots are illustrated and explained in Section 15.2 of this product manual. 20.2 Testing Assembly Inside all tank sumps the test gauge is connected to the end of the test tube. The test gauge assembly consists of an air gauge with a maximum 15 psi scale connected to a 1/4" brass tee fitting with a male 1/4" thread. The gauge threads directly into female brass fitting of the test tubes. The test tube in the terminating sump shall be capped with a .25" brass plug. 20.3 Air Pressure Testing Gradually pressurize the piping's interstitial space through the test tube to no more than 10 psi. During the pressurization period, apply an air pressure soap test to the entire piping line. After testing, disconnect the air hose and lay the test tube down into the bottom of the tank sump. IMPORTANT: Coax fittings require interstitial testing before and after backfill. 21.0 FLEXWORKS SYSTEM MAINTENANCE The FlexWorks System is designed to provide reliable underground fuel transfer and short-term secondary containment of leaked petroleum product. FlexWorks sumps and secondary containment pipes are not intended for long term storage of petroleum products. Liquid that accumulates in the secondary containment system must be promptly removed and properly disposed of. Operational third party approved liquid sensors should be installed and maintained in each sump to reliably indicate to the operator that liquid is present in the secondary containment system. Once a leak is detected, the system must be shut down immediately and the source of the leak must be repaired. All liquid must be thoroughly flushed and cleaned out of the secondary containment system at once. Inspect all system components at least monthly for leaks or damage, and repair or replace any suspect component as necessary. 21.1 ROUTINE SUMP INSPECTIONS Visual inspections of all containment sumps and components should be made on a routine basis to check for damage, water infiltration or for any signs of leaking product. An electronic or mechanical shut-off leak detection system is recommended for all containment sumps. When changing fuel filters at the dispenser, make sure any spilled product is cleaned out of the bottom of the dispenser sump. Sumps are to be kept free of debris and spilled fuel. NOTE: Failure to remove fuel and liquids from containment sumps may compromise the performance and integrity of the sump and its associated fittings and 18 FIPxW(DR KS BY DPW FUELING CONTAINMENT SYSTEMS seals over prolonged periods of time. Always follow warranty registration instruction and return warranty forms to OPW-FCS. 21.2 STORAGE AND TRANSIT Instructions shall specify that pipe and fittings are not intended for storage in direct sunlight or excessive temperatures and that rough handling (drops and impacts) during storage and transit may cause damage and leaking. Any special procedures for protection against environmental conditions and physical abuse during storage and transit shall be identified. Any special procedures for the inspection of parts for non- complying damage before assembly shall be identified with instructions specifying that a damaged part shall not be used. 22.0 PERIODIC INTERSTITIAL TESTING For periodic integrity testing of the interstitial space of the double wall pipe there is a different setup procedure for systems using coax fittings versus steel fittings with connector tubes. Both applications should have test tubes connected on each end. If they have been disconnected, reconnect them before testing. Follow the air pressure test procedures below for interstitial integrity testing. 22.1 Reconnect Test Tubes If necessary, reconnect the test tube located inside the tank sump to the test boot. Connect the test gauge assembly to the top end of the test tube. 22.2 Reconnect Connector Tubes If the piping system includes test boots with connector tubes then make sure all connector tubes have been reconnected. 22.3 Plug Test Tube Plug and seal the test tube fitting located at the terminating end of the flexible piping line. 22.4 Air Pressurize Pressurize the interstitial space to 10 psi for a period of one hour, in accordance with Section 21, Interstitial Integrity Testing. If required, disconnect all tubes after test. 23.0 PROBLEMS Investigation If leakage or damage is detected in any part of the system (either by inspection of the sump, a leak detector, or similar monitors), the problems are to be immediately investigated by the site operator. Warning: Ignoring or disabling leak detection alarms may lead to further damage and possible failure. Notification If leakage or damage to the piping system is verified, notify the Technical Service Department of OPW Fueling Containment Systems at one of the below noted phone numbers: • 1-800-422-2525 Toll Free • 1-919-934-2786 Extension 104