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Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities mary containment of secondarily contained spill buckets. WARNING: Use only an air-operated vacu- um source or a vacuum pump powered by `.• 6.3.2 Description of Test. Using a specially an explosion-proof motor. Vacuum pumps equipped test cover, a partial vacuum is applied to with electric motors that are not explo- the spill bucket.The vacuum level is monitored for Sion-proof may ignite flammable vapors. a 1-minute period. If a portable air compressor is used. it should be located at least 20 feet away 6.3.3 Test Equipment. Test equipment shall from the venturi-eductor or outside any include: Class I. Division 1 area. • Vacuum test apparatus (The test apparatus may be available from the spill bucket mimufacturer. 6.3.4 Preparation. It includes an air pressure regulator, a vacuum source. a vacuum gauge with a minimum 0-50 1. Remove and properly dispose of any liquid and inch water column range and a control valve.The debris (leaves, sediment and trash) in the spill control valve is used to adjust the vacuum level.); bucket.Clean the spill bucket and examine it for • Test cover (Tbe cover is equipped with a test damage,defects or improperly installld compo- fitting.); nents. If there are loose components (e.k., loose band clamps or bolts),tighten these items before • Plumber's plug(appropriate size, if used); performing the integrity test If there are items • Stopwatch or other time-measurement device that must be repaired or replaced (e.g., deterio- capable of measuring a I-second increment: rated gaskets/seals or drain valves), notify the owner/operator to obtain approval before pro- • Gasketing material (The purpose of the gas- ceeding with the needed repairs. keting material is to provide an air-tight seal 2 between the test cover and the spill bucket.). .Examine the fill cap and adapter fitting for loose,missing or damaged parts and make nec- essary repairs.Make sure that the seal on the fill 0-50'Water Column cap is present and in good condition. The cap Vacuum Vacuum Gauge must fit securely and be leak-tight on the riser. Source A leaking cap will result in a failed test. As an altemative to a tight fill cap, use a plumber's plug in the fill riser. Control 3.The ill bucket drain valve, if resent,must be Valve � P leak-tight to pass the test. If the drain valve is not leak-tight, it may be removed and perma- nendy plugged. NOTE: Before permanently plugging, ensure that local regulations allow the drain valve to Plumber's Plug in Tank Riser Pipe be permanently plugged. 4.Clean any contamination from the top surface of the spill bucket where the cover makes a seal and line it with gasketing material. S.Place the test cover on the spill bucket.con- firming that it makes a tight seal with the Bas- keting material. FIGURE 6-2. The cover must make a tight seal with the B.Connect the line from the vacuum source to the spill bucket to prevent leakage when the vacuum is adapter on the cover. � puffed during the test T. if the spill bucket is found to have cracks, loose parts or separation of the bucket from the fill