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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities the spill bucket, The vacuum level is monitored for NOTE : If the fill cap is not included in the spill bucket test and/or the cap is not tight, it a 1 -minute period . could be the source of potential fuel contami- 6 .3 :3 Test Equipment. Test equipment shall nation from water intrusion. include: • vacuum test apparatus (The test apparatus may NOTE: Before permanently plugging, ensure be available from the spill bucket manufacturer. that local regulations allow the drain valve to It includes an air pressure regulator, a vacuum be permanently plugged . source, a vacuum gauge with a minimum 0-50 inch water column range and a control valve. 6. 2.5 Test Procedure. The control valve is used to adjust the vacuum 1. Add water to the spill bucket to a level within level.) ; 1 .5 inches of the top of the spill bucket. Allow test cover (The cover is equipped with a test fit- the water to settle for S minutes before the initial ting.) ; water level measurement is taken. • plumber ' s plug (appropriate size, if used) ; 2 . Place the measuring stick vertically at the lowest point in the spill bucket and extending above the stopwatch or other time-measurement device water level to allow for an accurate measure- capable of measuring a 1 -second increment; ment to be taken. The location of the measuring gasketing material (The purpose of the gas- stick must remain the same for each water level keting material is to provide an air-tight seal measurement. Document the initial water level between the test cover and the spill bucket .) . measurement as measured from the bottom of the spill bucket. Alternative measurement meth- o - 5fl water column ods may be used provided that measurement to Vacuum Vacuum Gauge 1/16 (0.063) inch can be made. source i 3 . Take all precautions to prevent the water level from being disturbed during the duration of the control test. Valve 4. After 1 hour, document the ending water level measurement. S. Upon completion of the test, remove and dis- pose of the water according to Section 6 .7 , and dry the inside of the spill bucket before returning Plumber's Plug In I t to service. Tank Riser Pipe 6 . 2.6 Pass/Fail Criteria. If the water level has dropped less than 1/8 (0. 125 ) inch, the spill bucket passes the integrity test. If the water level has dropped 1 /8 (0. 125) inch or greater, the spill bucket fails the integrity test. 6.3 Spill Bucket Integrity Testing — Vacuum Test FIGURE 6-2. The cover must make a tight sea/ with the Method . spill bucket to prevent leakage when the vacuum Is 6 .3 . 1 Purpose . This method is used to test the pulled during the test. integrity of single-walled spill buckets or the pri- mary containment of secondarily contained spill WARNING• Use only an air-operated vac- buckets , uum source or a vacuum pump pow- 6.3 .2 Description of Test. Using a specially ered by an explosion-proof motor. Vacuum equipped test cover, a partial vacuum is applied to pumps with electric motors that are not pei .org