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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 venturi-eductor or outside . <br /> any Class I, Division 1 area. 4: <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 I 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 <br /> 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. 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/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 /> pei.org <br />