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-_ - -- JUL 0 7 2020 Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities • vacuum test apparatus (The test apparatus may 4.Connect the line from the vacuum source to the be available from the spill-bucket manufacturer. test apparatus. It includes an air pressure regulator, a vacuum 5.If the spill bucket is found to have cracks,loose source, a vacuum gauge with a minimum 0-30 parts or separation of the bucket from the fill inch water column range, a test fitting and a pipe, it is not considered to be liquid-tight.This control valve.The control valve is used to adjust visually indicates a test failure. the vacuum level.); • stopwatch or other time-measurement device 6.4.5 Test Procedure. capable of measuring a 1-second increment. 1.Slowly apply a vacuum of 15 inches water column to the spill bucket interstitial space and WARNING: Use only an air-operated vaeu- close the control valve. If a 15-inch water Col- um source or a vacuum pump powered by umn vacuum cannot be attained,the spill bucket an explosion-proof motor. Vacuum pumps fails the test. See Appendix B for pressure and with electric motors that are not explo- vacuum conversions. sloe-proof may Ignite flammable vapors. 2. Start the time-measurement device and record If a portable air compressor is used, It the initial vacuum level shown on the gauge. should be located at least 20 feet away from the venturl-eduetor or outside any 3.After 1 minute,record the ending vacuum level. Class 1, Division 1 area. Upon completion of the test,release the vacuum, remove the test apparatus and restore the spill Vacuum bucket to its normal operating condition. Source Control Valve 0-30'Water Column 6.4.6 Pass/Fail Criteria. If the ending vacuum Vacuum Gauge level is 12 inches water column or greater,the spill bucket passes the test. Regulator If the ending vacuum level is less than 12 inches water column,the spill bucket fails the test. 6.5 Containment Sump Integrity Testing. CAUTION: Gaining access to the contain- ment sump requires removing the lid, cover or dispenser panel that is In place to protect the equipment in the sump. These components can be heavy. They may require special handling and more than FIGURE 6-4. Check lines and connections to ensure one person to remove them. Use caution that they are leak-tight before starting the test. when moving and replacing them when testing is complete. During the test, put the covers and panels In a safe location 6.4.4 Preparation. where they are secure and Isolated from 1.Remove and properly dispose of any liquid and vehicle and customer traffic. debris (leaves, sediment and trash) in the spill bucket. 6.5.1 General. Containment sumps are liquid- 2.Clean the spill bucket and examine it for dam- light structures designed to temporarily contain age. Make sure that it is free of cracks, loose leaks or spills. In addition, containment sumps parts or separation of the bucket from the fill often serve as the leak detection monitoring loca- pipe. If the spill bucket is damaged, notify the tion for double-walled piping systems. Leakage owner/operator. from the primary containment typically flows by gravity inside the secondary containment to the 3.Attach the test apparatus to the test port. pei.org