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f7sy PEI/RP1200-12 records or the ATG readout. Prepare a monitoring fluid solution to add to the interstitial space. 5. PIPING SECONDARY 4.3.6 Steel Tanks. Liquid-filled (hydrostatic) CONTAINMENT INTEGRITY tests on steel tanks require the same fluid as the TESTING monitoring fluid. Contact the manufacturer for - - instructions. 5.1 General. Underground product piping is available 4.3.7 Fiberglass Tanks. Determine tank size with single and double walls. Double-walled piping pro- arid diameter and apply the appropriate method. vides containment for leaks from primary containment and must he leak-free to prevent release of product into 4.3.8 Test Equipment. Test equipment shall the environment. include: 5.2 Purpose. This method is used to test the integrity • monitoring fluid; of piping interstitial space(s). • stopwatch or other time-measurement device 5.3 Description of Test. The interstitial space is capable of measuring a 1-second increment-, sealed at the ends and is pressurized with an inert gas. • tape measure. The pressure is monitored for I hour. If any pressure drop 4.3.9 Test Procedure. occurs,the secondary containment fails the test. 1. Remove any sensor that may he installed in the 5.4 Test Conditions. The primary pipe may contain tank interstitial space. fuel, and dispensing activities may continue during the test without affecting test results. 2. Determine and record the groundwater level. 5.5 Preparation. If the interstitial space contains prod- 3. Add test liquid to the tank interstitial space uct, ensure that the interstice is open to the atmosphere bringing the fluid level into the riser (stand- and perform a precision test on the primary piping before pipe) a the appropriate level based on the conducting a test on the secondary containment piping. manufacturer's written procedure. 4. Document the starting level and start time of Termination fittings must be sealed at all piping termina- the test. tions, and test fittings must be accessible to perform the. test. 5. Start the time-measurement device. Check with the piping manufacturer regarding testing 6. Wait the appropriate time according to the procedures and the pruner pressure before testin.p. Test- manufacturer's test procedure. 7. Document the ending level and ending time of the test. ti S. Determine and record the groundwater level . 9. Remove liquid added to the ,tank interstitial ' Y space, and restore the liquid level in the tank r interstitial to nomial operating condition. 10.Reinstall the sensor so that it is installed within manufacturer's specifications. 4.3,10 Pass/Fail Criteria. Compare the data to the manufacturer's pass/fail criteria in Appendix A to determine if the tank has passed the test. FIGURE 5-1. Boots on piping transitions and through sump walls must be leak-tight when piping secondary containment integrity testing is performed. pei.org