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PEiiRP1200_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 I - minute period . 6.3. 5 Test Procedure . 6 .4,3 Test Equipment. 'fest equipment shall � 1. Slowly apply 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 30Anch water column vacuum cannot be be available from the spill - bucket martufacturer. attained, the spill bucket fails the test , Sec It includes an wr pressure regulator, a vacuum Appendix II for pressure and vacuum convcr- stwrce, a vacuum gauge with a minimum U-30 cions . inch water column range , it test Gating 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 . ) ; • stopwatch or other time -measurement device 3. After I minute, record the ending vacuum level . capable of measuring a I -second increment . Upon completion of the test, release the vacuum , remove the test apparatus and the gasketing mate- WARNING : Use only an alr-operated vacu- rial from the spill bucket and replace the original um source or a vacuum pump powered by cover, an explosiornproof motor, Vacuum pumps _ with electric motors that are not explo- - _ r slon-proof may Ignite flammable vapors . It a portable air compressor Is used , it should be located at least 20 feet away from the venturFeductor or outside any Class I , Division 1 area . Vacuum *urce Control Valve 0 • 30" Water Column Vacuum Gauge R8g ',aii ', r FIGURE s •3 , The vacuum test method can detect a split bucket leak by measuring the change in vacuum level 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 64 . Check lines and connections to enswe Vacuum Test Method . that they are leak4ight 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 •..o/ applied to the interstitial space between the primary bucket. pei .orq