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rPEIlRP1200-12 pipe, it is not considered to be liquid-tight. This and secondary containment. The vacuum level is visually indicates a test failure. monitored for a 1-minute period. 6.3.5 Test Procedure. 6.4.3 Test Equipment. Test equipment shall 1.Slowly apply a l a vacuum of 30 inches water include: column to the spill bucket and close the valve. vacuum test apparatus (The test apparatus may If a 30-inch water column vacuum cannot be be available from the spill-bucket manufacturer. attained, the spill bucket fails the test. See It includes an air pressure regulator, a vacuum Appendix B for pressure and vacuum conver- source, a vacuum gauge with a minimum 0.30 sions. inch water column range, a test fitting and a 2.Start the time-measurement device and record control valve.The control valve is used to adjust the initial vacuum level shown on the gauge. the vacuum level.); 3.After 1 minute,record the ending vacuum level. stopwatch or other time-measurement device capable of measuring a 1-second increment. Upon completion of the test, release the vacuum, remove the test apparatus and the Basketing mate- WARNING: Use only an air-operated vacu- rial from the spill bucket and replace the original um sourceora vacuum pump powered by cover. an explosion-proof motor. Vacuum pumps with electric motors that are not explo- sion-proof may ignite flammable vapors. If a portable air compressor is used, it yF should be located at least 20 feet away from the venturl-eductor or outside any Class I, Division 1 area. 151 Vacuum Source Control Valve s ?- -5r ✓ 0-3t]°Water Column Vacuum Gauge r Hegulator FIGURE 6-3. The vacuum test method can detect a spill bucket leak by measuring the change in vacuum level 3 during the test. 6.3.6 Pass/Fail Criteria. If the ending vacuum level is 26 inches water column or greater, the spill bucket passes the test. If the ending vacuum level is less than 26 inches water column, the spill bucket fails the test. 6.4 Double-Walled Spill Bucket Integrity Testing-- FIGURE 6-4. Check lines and connections to ensure Vacuum Test Method. that they are leak-tight before starting the test. 6.4.1 Purpose. This method is used to test the integrity of the primary and secondary containment 6.4.4 Preparation. of the double-walled spill bucket. 1.Remove and properly dispose of any liquid and 6.4.2 Description of Test. A partial vacuum is debris (leaves, sediment and trash) in the spill applied to the interstitial space between the primary bucket. peLorg