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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- 6 ■ -S ILL- OUCKET AND , sure levels and test durations are addressed in Section 5 .7 . CONTAINMENT SUMP Piping manufacturers ' test procedures may differ. " TESTING. This test can be conducted in sections or as one con- tinuous pipe depending on the installation. Care should be 6A General. Spill buckets and containment sumps for taken to ensure that the entire secondary containment of tank systems are neither intended nor designed for the the piping system is tested. storage of petroleum products, but rather to contain small leaks and spills for short periods of time. This section 5.6 Test Equipment. Test equipment shall include: describes the procedures used to test the integrity of spill • inert gas source (nitrogen , helium, etc. ) ; buckets and containment sumps to ensure that they do not • stopwatch or other time-measurement device capable leak• of measuring a 1-second increment; 6 .2 Spill Bucket Integrity Testing Hydrostatic • test tubing assemblies (Tubing assemblies provide Test Method. access to the beginning and end of the interstitial space.) ; WARNING : bo not use fuels such as gaso- • pressure gauge with a 15 psig maximum pressure read- line, E85 or diesel as a test fluid because ing with 0.5 increments. they present a serious fire and safety hazard , Gasoline vapors are flammable 5. 7 Test Procedure . and can explode if exposed to an ignition 1.. If necessary, reinstall termination (test) boots at pip- source such as a spark or open flame. if Ing terminations , a tank or containment area is not tight, using fuel as the test fluid will cause a 2. If necessary, connect the tubing assemblies to the sec- release Into the soil or groundwater. ondary containment termination fitting 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 prig. Close the valve and allow the pressure to stabilize. Repressurize to the specified test pressure if necessary. Water L 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. 7. Release the pressure on the system slowly. 8 . Remove the test equipment. • z. ' 9 . Restore the piping to its normal operating condition. 4W V. Pass/Fall Criteria. If no pressure change occurs .y. " ore during the test period, the piping system passes the sec- ondary containment integrity test. FIGURE 6A. The hydrostatic method of determining spill bucket integrity uses water to detect leaks. The If there is any drop in pressure over the test period, the measuring stick must be placed in the same location piping fails the secondary containment integrity test* at the beginning and end of the test period to ensure If there is any increase in pressure over the test pcsiod, accurate water level readings. repeat the test. pei .org