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Recommended Practices for the Testing and Verification of Spill,overfill,I eak Detection and Secondary Containment Fquipment at UST lacilities f j wary 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 cquippcd test covcr, 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 I-minute period. If a portable air compressor is used, it should be located at least 20 feet away 6.3.3 Test Equipment. 'fest equipment shall from the venturi-eductor or outside any include: Class I, Division 1 area. • Vacuum test apparatus (The test apparatus may be available frons the spill huckct manufacturer. 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 • fest cover (The cover is equipped with a test damage, defects or improperly installed compo- fitting.); rents. If there are loose components (e.g., loose band clamps or bolts),tighten these items before • Plumber's plug (appropria(e sire, if used); performing the integrity test. if there are items • Stopwatch or other time-nleasurenlent 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. ketirlg material is to provide an air-light seal between the test cover and the spill bucket.). 2. Examine the fill cap and adapter fitting for loose, rrIlsshig or damaged parts and make nec- essary repairs.Make sure that the seal on the fill o-50"water column cap is present and in good condition. "1'he cap Vacuum Vacuum Gauge must fit securely and he leak-tight on the riser. Source _ :"i'. A leaking cap will result in a failed test. As an alternative to a tight fill cap, use a plumber's plug in the fill riser. Control Valve 3.The spill bucket drain valve, if present, must be leak-tight to pass the test. If the drain valve is not Irak-tight, it may he removed and perma- nently plugged. kls�u NOTE: Rehire permanently plugging, cnsurc Plumber's Plug In that local regulations allow the drain valve to Tank Riser Pipe he permanently plugged. 4.Clean any contamination from the top surface of the spill bucket where the cover makes a seal and line it with gaskcting material.. 5.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 seat with the 6.Connect the line from the vacuum source to the spill bucket to prevent leakage when the vacuum is adapter on the cover. pulled during the test. 7.If the spill huckct is found to have cracks, loose parts or separation of the bucket from the fill pei.org f I