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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities ing requirements stated in this recommended practice are general statements and may vary. Recommended pres- sure levels and test durations are addressed in Section 5.7. Piping manufacturers' test procedures may differ. This test can be conducted in sections or as one con- tinuous pipe depending on the installation, Care should be taken to ensure that the entire secondary containment of the piping system is tested. 5.6 Test Equipment. Test equipment shall include: • inert gas source (nitrogen, helium, etc.); • stopwatch or other time -measurement device capable of measuring a 1 -second increment; • test tubing assemblies (Tubing assemblies provide access to the beginning and end of the interstitial space.); • pressure gauge with a 15 psig maximum pressure read- ing with 0.5 increments. 5.7 Test Procedure. 1. If necessary, re -install termination (test) boots at pip- ing terry mations. 2. If necessary, connect the tubing assemblies to the sec- ondary containment termination fitting on each end of the section of piping to be tested. 8. 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 pressure 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 forleaks. 7. Release the pressure on the system slowly. 8. Remove the test equipment. 9. Restore the piping to its normal operating condition. 5.8 Pass/Fail Criteria. If no pressure change occurs during the test period, the piping system passes the sec- ondary containment integrity test. If there is any drop in pressure over the test period, the piping fails the secondary containment integrity test. If there is any increase in pressure over the test period, repeat the test. 6. SPILL BUCKET AND CONTAINMENT SUMP TESTING 6.1 General. Spill buckets and containment sumps for tank systems are neither intended nor designed for the storage of petroleum products, but rather to contain small leaks and spills for short periods of time. This section describes the procedures used to test the integrity of spill buckets and containment sumps to ensure that they do not leak. 6.2 Spill Bucket Integrity Testing -- Hydrostatic Test Method. WARNING: Do not use fuels such as gaso- line, E85 or diesel as a test fluid because they present a serious fire and safety hazard. Gasoline vapors are flammable and can explode if exposed to an ignition source such as a spark or open flame. If a tank or containment area is not tight, using fuel as the test fluid will cause a release into the soil or groundwater. Water Level FIGURE 6-1. The hydrostatic method of determining spill bucket integrity uses water to detect leaks. The measuring stick must be placed in the same location at the beginning and end of the test period to ensure accurate water level readings. pei.org