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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Pquipment at UST Facilities <br />mary containment of secondarily contained spill <br />buckets. <br />6.3.2 Description of Test. Using a specially <br />equipped test cover, a partial vacuum is applied to <br />the spill bucket. The vacuum level is monitored for <br />a 1 -minute period. <br />6.3.3 Test Equipment. Test equipment shall <br />include: <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 0-50 <br />inch water column range and a control valve. The <br />control valve is used to adjust the vacuum level.); <br />• Test cover (The cover is equipped with a test <br />fitting.); <br />• Plumber's plug (appropriate size, if used); <br />Stopwatch or other time -measurement device <br />capable of measuring a 1 -second increment; <br />• Gasketing material (The purpose of the Bas- <br />keting material is to provide an air -tight sea] <br />between the test cover and the spill bucket.). <br />0 - 50" Water Column <br />Vacuum Vacuum Gauge <br />Source n <br />Control <br />Valve <br />FIGURE 6-2. The cover must make a tight sea/ with the <br />spill bucket to prevent leakage when the vacuum is <br />pulled during the test. <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 />6.3.4 Preparation. <br />1. Remove and properly dispose of any liquid and <br />debris (leaves, sediment and trash) in the spill <br />bucket. Clean the spill bucket and examine it for <br />damage, defects or improperly installed compo- <br />nents. If there are loose components (e.g., loose <br />band clamps or bolts), tighten these items before <br />performing the integrity test. If there are items <br />that must be repaired or replaced (e.g., deterio- <br />rated gaskets/seals or drain valves), notify the <br />ownerloperator to obtain approval before pro- <br />ceeding with the needed repairs. <br />2. Examine the fill cap and adapter fitting for <br />loose, missing or damaged parts and make nec- <br />essary repairs. Make sure that the seal on the fill <br />cap is present and in good condition. The cap <br />must fit securely and be leak -tight on the riser. <br />A leaking cap will result in a failed test. As an <br />alternative to a tight fill cap, use a plumber's <br />plug in the fill riser. <br />3. The spill bucket drain valve, if present, must be <br />leak -tight to pass the test. If the drain valve is <br />not leak -tight, it may be removed and perma- <br />nently plugged. <br />NOTE; Before permanently plugging, ensure <br />that local regulations allow the drain valve to <br />be permanently plugged. <br />4. Clean any contamination from the top surface <br />of the spill bucket where the cover makes a seal <br />and line it with gasketing material. <br />5. Place the test cover on the spill bucket, con- <br />firming that it makes a tight seal with the gas- <br />keting material. <br />6. Connect the line from the vacuum source to the <br />adapter on the cover. <br />7. If the spill bucket is found to have cracks, loose <br />parts or separation of the bucket from the fill <br />pei.org 0 <br />