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pei.org 17 <br />Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities <br />• vacuum test apparatus (The test apparatus may <br />be available from the spill-bucket manufacturer. <br />It includes an air pressure regulator, a vacuum <br />source, a vacuum gauge with a minimum 0-30 <br />inch water column range, a test fitting and a <br />control valve. The control valve is used to adjust <br />the vacuum level.); <br />• stopwatch or other time-measurement device <br />capable of measuring a 1-second increment. <br />WARNING: Use only an air-operated vacu- <br />um source or a vacuum pump powered by <br />an explosion-proof motor. Vacuum pumps <br />with electric motors that are not explo- <br />sion-proof may ignite flammable vapors. <br />If a portable air compressor is used, it <br />should be located at least 20 feet away <br />from the venturi-eductor or outside any <br />Class I, Division 1 area. <br />6.4.4 Preparation. <br />1.Remove and properly dispose of any liquid and <br />debris (leaves, sediment and trash) in the spill <br />bucket. <br />2.Clean the spill bucket and examine it for dam- <br />age. Make sure that it is free of cracks, loose <br />parts or separation of the bucket from the fill <br />pipe. If the spill bucket is damaged, notify the <br />owner/operator. <br />3.Attach the test apparatus to the test port. <br />4.Connect the line from the vacuum source to the <br />test apparatus. <br />5.If the spill bucket is found to have cracks, loose <br />parts or separation of the bucket from the fill <br />pipe, it is not considered to be liquid-tight. This <br />visually indicates a test failure. <br />6.4.5 Test Procedure. <br />1. Slowly apply a vacuum of 15 inches water <br />column to the spill bucket interstitial space and <br />close the control valve. If a 15-inch water col- <br />umn vacuum cannot be attained, the spill bucket <br />fails the test. See Appendix B for pressure and <br />vacuum conversions. <br />2.Start the time-measurement device and record <br />the initial vacuum level shown on the gauge. <br />3.After 1 minute, record the ending vacuum level. <br />Upon completion of the test, release the vacuum, <br />remove the test apparatus and restore the spill <br />bucket to its normal operating condition. <br />6.4.6 Pass/Fail Criteria. If the ending vacuum <br />level is 12 inches water column or greater, the spill <br />bucket passes the test. <br />If the ending vacuum level is less than 12 inches <br />water column, the spill bucket fails the test. <br />6.5 Containment Sump Integrity Testing. <br />CAUTION: Gaining access to the contain- <br />ment sump requires removing the lid, <br />cover or dispenser panel that is in place to <br />protect the equipment in the sump. These <br />components can be heavy. They may <br />require special handling and more than <br />one person to remove them. Use caution <br />when moving and replacing them when <br />testing is complete. During the test, put <br />the covers and panels in a safe location <br />where they are secure and isolated from <br />vehicle and customer traffic. <br />6.5.1 General. Containment sumps are liquid- <br />tight structures designed to temporarily contain <br />leaks or spills. In addition, containment sumps <br />often serve as the leak detection monitoring loca- <br />tion for double-walled piping systems. Leakage <br />from the primary containment typically flows by <br />gravity inside the secondary containment to the <br />Vacuum <br />Source Control Valve <br />Regulator <br />0 - 30" Water Column <br />Vacuum Gauge <br />FIGURE 6-4. Check lines and connections to ensure <br />that they are leak-tight before starting the test. #