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PEURP1200 - 17 <br /> explosion-proof may ignite flammable <br /> vapors. if a portable air compressor is 00 <br /> used , it should be located at least 20 feet <br /> away from the venturWductor or outside , <br /> any Class I , Division 1 area. <br /> f <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 <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 neo- If a 304nch 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 . The spill bucket drain valve, if present, must be 3. After 1 minute, record the ending vacuum level , <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 perma- remove the test apparatus and the gasketing mate- <br /> nently plugged. nal 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/Fall 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 /> 4 . Clean any contamination from the top surface <br /> of the spill bucket where the cover makes a seal If the ending vacuum level is less than 26 inches <br /> and line it with gasketing material. water column , the spill bucket fails the test . <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 and secondary containment. The vacuum level is <br /> visually indicates a test failure. monitored for a 1 -minute period . <br /> 6 .4. 3 Test Equipment . Test equipment shall <br /> include: <br /> peLorg <br />