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—ground PipingFlo,* 'VOQ RKS 'AN" BY OPW FUELING CONTAINMENT SYSTEMS mended for all containment sumps.When changing fuel fil- 23.0 GUIDE SPECIFICATIONS ters at the dispenser,make sure any spilled product is 23,1 Short Form cleaned out of the bottom of the dispenser sump.Sumps are to be kept free of debris and spilled fuel. The contractor shall provide a flexible underground piping system whereby the flexible piping,fittings,adapters and NOTE:Failure to remove fuel and liquids from contain- under dispenser riser pipes are secondarily contained and ment sumps may compromise the performance and in- having no metallic components exposed to the environment. tegrity of the sump and its associated fittings and seals The primary pipe shall be capable of being air pressure tested regover prolonged periods of time.Always follow warranty to 1.5 times the operating pressure of the pump not exceed- OPW. instruction and return warranty forms to ing 60 psi.The secondary shall be capable of being air tested OPW. to 10 psi. 20.2 STORAGE AND TRANSIT 23.2 Long Form Instructions shall specify that pipe and fittings are not intend- The following guide specification is designed around the use ed for storage in direct sunlight or excessive temperatures of OPW-FCS's flexible piping. and that rough handling(drops and impacts)during storage and transit may cause damage and leaking.Any special pro- 23.2.1 Design cedures for protection against environmental conditions and The contractor shall provide a secondarily contained flexible physical abuse during storage and transit shall be identified. underground piping system that shall provide secondary Any special procedures for the inspection of parts for non- containment for all primary piping,couplings,fittings and complying damage before assembly shall be identified with adapters.Piping runs shall be continuous between contain- instructions specifying that a damaged part shall not be used. ment chambers(ie.,tank&dispenser sumps or pans)in which 21.0 PERIODIC INTERSTITIAL TESTING all joints are contained within the containment chambers. The piping design shall allow for any leak in the primary sup- ply or integrity testing of the interstitial space of the ply or secondary containment piping to be directed to a leak double wolf pipe there is a different setup procedure for sys- detection sensor. tems using coax fittings versus steel fittings with connector tubes.Both applications should have test tubes connected on 23.2.2 Product And Chemical Compatibility each end.If they have been disconnected,reconnect them- The flexible underground piping and associated couplings, before testing.Follow the air pressure test procedures below fittings and adapters shall be chemically compatible with the for interstitial integrity testing. products to be transported and with chemicals found natu- 21.1 Reconnect Test Tubes rally in the ground environment. The primary and secondary piping shall be compatible with gasoline,alcohols,gasoline- If necessary,reconnect the test tube located inside the tank alcohol mixtures and all EPA approved additives,including sump to the test boot.Connect the test gauge assembly to MTBE. the top end of the test tube. 23.2.3 Corrosion Resistance 21.2 Reconnect Connector Tubes The flexible underground piping and associated couplings, If the piping system includes test boots with connector tubes fittings and adapters which come in contact with the ground then make sure all connector tubes have been reconnected. environment shall be made of nonmetallic material or encap- 21.3 Plug Test Tube sulated by non-metallic components which prevent corro- Plug and seal the test tube fitting located at the terminating sion. end of the flexible piping line. 23.2.4 Structural Integrity 21.4 Air Pressurize The flexible underground piping and associated couplings, Pressurize the interstitial space to 10 psi for a period of one fittings and adapters shall be designed and constructed of hour,in accordance with Section 21,Interstitial Integrity Test- materials strong enough for its intended use.The flexible ing.If required,disconnect all tubes aftertest. piping shall not collapse,crack or break due to ground move- ment or from backfill and high ground water pres-sures.Pip- Z2.0 PROBLEMS ing shall be able to transfer fluid up to a maximum tempera- Investigation ture of 125 degrees fahrenheit(52 degrees celsius).Piping If leakage or damage is detected in any part of the system shall be operational with in a temperature band of minus 40C (either by inspection of the sump,a leak detector,or similar and+65C. monitors),the problems are to be immediately investigated 23.2.5 Bend Radius by the site operator. The double wall flexible piping shall be capable of a mini- Warning:Ignoring or disabling leak detection alarms may mum bend radius without kinking,cracking or breaking.The lead to further damage and possible failure. minimum bend radii shall be equal to or less than the follow- Notification ing: If leakage or damage to the piping system is verified,notify the Technical Service Department of OPW at 1-800-422-2525.