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PEI/ RP120017 <br /> explosion- proof may ignite flammable <br /> vapors . If a portable air compressor is _ <br /> used , it should be located at least 20 feet <br /> away from the venturifted uctor or outside r <br /> any Class I , Division 1 area . <br /> 6 . 3 .4 Preparation . _. <br /> 1. Remove and properly dispose of any liquid and <br /> debris (leaves , sediment and trash) in the spill <br /> bucket . Clean the spill bucket and examine it for f <br /> damage, defects or improperly installed compo - <br /> nents . If there are loose components (e . g . , loose <br /> band clamps or bolts) , tighten these items before FIGURE 6-3 . The vacuum test method can detect a spill <br /> performing the integrity test. If there are items bucket leak by measuring the change in vacuum level <br /> that must be repaired or replaced (e . g . , deterio. during the test. <br /> rated gaskets/seals or drain valves) , notify the <br /> owner/operator to obtain approval before pro- 6 . 3 . 5 Test Procedure . <br /> ceeding with the needed repairs . 1. Slowly apply a 1 a vacuum of 30 inches water <br /> 2 . Examine the fill cap and adapter fitting for column to the spill bucket and close the valve . <br /> loose , missing or damaged parts and make nec- If a 30-inch water column vacuum cannot be <br /> essary repairs . Make sure that the seal on the fill attained, the spill bucket fails the test. See <br /> cap is present and in good condition . The cap Appendix B for pressure and vacuum conver- <br /> must fit securely and be leak- tight on the riser. sions . <br /> A leaking cap will result in a failed test. As an 2 . Start the time-measurement device and record <br /> alternative to a tight-fill cap , use a plumber ' s the initial vacuum level shown on the gauge . <br /> plug in the fill riser. <br /> 3 . After 1 minute, record the ending vacuum level . <br /> 3 . The spill bucket drain valve , if present , must be <br /> leak-tight to pass the test . If the drain valve is Upon completion of the test, release the vacuum , <br /> not leak-tight, it may be removed and perina- remove the test apparatus and the gasketing mate- <br /> nently plugged. rial from the spill bucket and replace the original <br /> cover. <br /> NOTE : Before permanently plugging , ensure <br /> that local regulations allow the drain valve to 6 . 3 . 6 Pass/ Fail Criteria . If the ending vacuum <br /> be permanently plugged . level is 26 inches water column or greater, the spill <br /> bucket passes the test . <br /> from the to surface <br /> 4. Clean an contaminationp <br /> YIf the ending vacuum level is less than 26 inches <br /> of the spill bucket where the cover makes a seal <br /> water column , the spill bucket fails the test. <br /> and line it with gasketing material . <br /> 5. Place the test cover on the spill bucket, confirm- 6 . 4 Double-Walled Spill Bucket Integrity Testing — <br /> ing that it makes a tight seal with the gasketing Vacuum Test Method . <br /> material . <br /> 6 . 4. 1 Purpose . This method is used to test the <br /> 6 . Connect the line from the vacuum source to the integrity of the primary and secondary containment <br /> adapter on the cover. of the double-walled spill bucket . <br /> 7 . If the spill bucket is found to have cracks , loose 6 . 4. 2 Description of Test . A partial vacuum is <br /> parts or separation of the bucket from the fill applied to the interstitial space between the primary <br /> pipe, it is not considered to be liquid-tight. This <br /> visually indicates a test failure . and secondary containment. The vacuum level is <br /> monitored for a 1 -minute period . <br /> 6 . 4. 3 Test Equipment . Test equipment shall <br /> include : <br /> pei . org <br />