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rr(y PEi/RP1200-12 records or the ATG readout. Prepare a monitoring fluid solution to add to the interstitial space. S. 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. 5.1L General. Underground product piping is available 4.3.7 Fiberglass Tanks. Determine tank sizc with Single and double walls. Double-walled piping pro- and diameter and apply the appropriate method. vides containment for leaks from primary containment and must be 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 I-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 be installed in the 5.4 Test Conditions. The primary- pipe may contain fuel, and dispensing activities may continue during the tank interstitial space. 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) to the appropriate level based on the conducting a test on the secondary containment pipincr. manufacturer's written procedure. 4. Document the starting level and start time of Termination fittings must be sealed at all piping ternuna- the test. tions, and test fittings must be accessible to perform the test. 5. Start the time-measurement device. 414 Check with the piping manufacturer regarding testing 6. Wait the appropriate time according to the procedures and the proper pressure before testing. Test- manufacturer's test procedure. s 7. Document the ending level and ending time of the test. - 8. Determine and record the groundwater level - - 9. Remove liquid added to the tank interstitial space, and restore the liquid level in the tank interstitial to normal 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 ri. Boots on piping transitions and through sump walls must be leak-tight when piping secondary containment integrity testing is performed. __- pei.org