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Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities NOTE: If the fill cap is not included in the the spill bucket.The vacuum level is monitored for Spill bucket test and/or the cap is not tight, it a ]-minute period. could be the source of potential fuel contami- 6.3:3 Test Equipment. Test equipment shall nation from water intrusion. include: NOTE: Before permanently plugging, ensure vacuum test apparatus (The test apparatus may that local regulations allow the drain valve to be available from the spill bucket manufacturer. be permanently plugged. It includes an air pressure regulator, a vacuum 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 5 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-50`water column ods may be used provided that measurement to Vacuum Vacuum Gauge 1/16(0.063)inch can be made. source 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 it 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 seal 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