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Recommended Practices for the A and Verificadon of Spill,Overfill,Leak Detection andkdaiy Containment Equipment at UST Facilities ing requirementss t sr o practice am general statements and may vary Recommended pres- 6, SPILL BUCKET AND sure levels W test durations am 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 6.1 General. Spill buckets and containment sumps for taken toe 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 5.6 Test Equipment. Test equipment shall include: leaks and spills for short periods of time. This section 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 orother time-measurement device capable leak- of measuring a I-second increment; 6.2 SON Bucket Integrity Testing — Hydrostatic * test tubing assemblies (Tubing assemblies provide Test Method. access to the beginning and end of the interstitial space.); WARNING: Do not use fuels such as gaso- * pressure gauge with a 15 psig maximum pressure read- line, ESS or diesel as a test fluid because ing with 0.5 increments. they present a serious fire and safety ® Gasoline vapors are flammable 5.7 Test Procedure. and can explode If exposed to an Ignition 1.If necessar)4 re-install termination (test) is at pip- source such as a spark or open flame. If ing terminations. a tank or containment area Is not tight, iill 2.If necessary,connect the tubing assemblies to the see- using fuel as the test flud wcause a 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 psig. Close the valve and allow the pressure to stabilize. Repressurize to the specified test pressure if necessary. Water Level ®Observe the pressure for a period of 1 hour. 6.If the piping pressure after I our is less than the test pressure,check termination fittings and test assemblies for leaks. ......... .... 7®Release the pressure on ffie system slowly. 8.Remove the test equipment. 9.Restore the piping to its normal operating condition. 5.8 Pass/Fall Criteria. If no pressure change occurs during the test period, the piping system passes the sec® FIGURE . The hydrostatic method of determining ondary containment integrity test, split bucket integrity uses water to detect leaks. The If the 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 period, accurate water level readings. repeat the test. pel.org