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�� PEI/RP1200-17 Termination fittings must be sealed at all piping 5. PIPING SECONDARY terminations, and test fittings must be accessible to CONTAINMENT INTEGRITY perform the test. TESTING Check with the piping manufacturer regarding testing procedures and the proper pressure before 5.1 General. Underground product piping is available testing. Testing requirements stated in this recom- with single and double walls.Double-walled piping pro- mended practice are general statements and may vides containment for leaks from primary containment vary. Recommended pressure levels and test dura- and must be leak-free to prevent release of product into tions are addressed in Section 5.3.5. Piping manu- the environment. facturers'test procedures may differ. 5.2 Purpose. This method is used to test the integrity This test can be conducted in sections or as one of piping interstitial space(s). continuous pipe depending on the installation.Care should be taken to ensure that the entire secondary 5.3 Testing Piping Under Pressure. containment of the piping system is tested. 5.3.1 Description of Test. The interstitial space 5.3.4 Test Equipment. Test equipment shall is sealed at the ends and is pressurized with an inert include: gas. The pressure is monitored for 1 hour. If any . inert gas source(nitrogen,helium,etc.); pressure drop occurs, the secondary containment fails the test. • stopwatch or other time-measurement device capable of measuring a 1-second increment; 5.3.2 Test Conditions. The primary pipe may contain fuel, and dispensing activities may con- test tubing assemblies ('Tubing assemblies pro- vide access to the beginning and end of the tinue during the test without affecting test results. interstitial space.); 5.3.3 Preparation. If the interstitial space con- . pressure gauge with a 15 psig maximum pres- tains product, ensure that the interstice is open to sure reading with 0.5 increments. the atmosphere and perform a precision test on the primary piping before conducting a test on the sec- 5.3.5 Test Procedure. ondary containment piping. 1.If necessary,re-install termination(test)boots at piping terminations. 2.If necessary, connect the tubing assemblies to the secondary containment termination fitting f4��.:• on each end of the section of piping to be tested. 3.Connect the inert gas source and pressure gauge. 4.Gradually pressurize the interstitial space to 5 psig. Close the valve and allow the pressure to stabilize.Repressurize to the specified test pres- sure if necessary. 5.Observe the pressure for a period of 1 hour. 6.If the piping pressure after 1 hour is less than the test pressure,check termination fittings and test �.; assemblies for leaks. S 7.Release the pressure on the system slowly. S.Remove the test equipment. FIGURE 5-1. Boots on piping transitions and through 9.Restore the piping to its normal operating condi- sump walls must be leak-tight when piping secondary tion. containment integrity testing is performed. ® pei.org