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PEIlRP1200.12 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 1 a vacuum of 34 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 13 for pressure and vacuum conver- source, a vacuum gauge with a minimum 0-30 sions. inch wafer 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 l minute,record the ending vacuum level. stopwatch or other time-measurement device capable of ieasuring a 1-second increment. Upon completion of the test, release the vacuum, remove the test apparatus and the gasketing mate- WARNING- Use only an air-operated vacu- rial from the spill bucket and replace the original um source or a vacuum pump powered by cover an explosion-proof motor. Vacuum pumps with electric motors that are not explo- "` 0'' Y may Sion-proof ignite flammable vapors. P Y g If a portable air compressor is used, it should be located at least 20 feet away r.: = ; from the venturi-elector or outside any Class I, Division 1 area. "f ,Lace CuriIrol Valva 4-30'Water Column ................_. vacuum{gauge ...... . ...... .... Ragulator FIGURE 6-3. The vacuum test method can detect a spill bucket leak by measuring the change in vacuum level during the test. 6.3.6 Pass/Fall 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 mod to test the integrity of the primary and secondary containment 6A.4 Preparation. of the double-walled spill bucket I. Remove and properly dispose of any liquid and 6.4.2 Description of rest. A partial vacuum is debris (leaves, sediment and trash) in the spill applied to the interstitial space between the primary bucket. l pei.arg