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PEVRP1200 - 17 Underground Fiberglass Double and Triple- Wall Repeat steps 4 and 5 until a stable vacuum is Tanks With Dry Annular Space FTPI 4/01 /07 . achieved. If a stable vacuum cannot be main- tained , the tank secondary containment integ- 4. 2 . 7 Test Equipment . Test equipment shall rity test fails . include : 7 . When the vacuum level stabilizes , record the • a vacuum-generating device that can be used in vacuum level and the test start time . a Class I, Division 1 area capable of pulling 15 inches of mercury (Hg) vacuum ; 8 . Observe the vacuum level for the period of time shown in Table 4- 1 . • an automatic vacuum shutoff valve or vacuum regulator (The shutoff valve can be set to 9 • Record the final time and vacuum level . close at a predetermined safe level, preventing 10 . Check the interstitial space for accumulation the possibility of accidentally imposing a high of liquids . vacuum that could damage the tank . The use of the valve is recommended because it limits theTABLE 4=1 vacuum that can be applied to the interstitial Vacuum , Capacity, Duration , space . ) ; inches Hg gallons hours • vacuum gauge with a range of 0 inches to 30 < 20 , 000 1 inches Hg graduated in increments of 0 .5 inches 10 20,000+ 2 Hg or less ; toggle valve and vacuum hose; 4. 2 . 9 Pass/Fail Criteria . If there is no loss in • vacuum level , no liquids are drawn into the inter- • stopwatch or other time measurement device stitial space during the test duration shown in Table capable of measuring a 1 - second increment ; 4. 1 , and the tank secondary containment area has • plumber ' s plug. no additional fluid than at the start of the test, then the tank secondary containment passes the test. 4. 2.8 Test Procedure . If there is any vacuum lost during the test or liquids 1. Install the plumber ' s plug in the interstitial are drawn into the interstitial space, then the tank riser(s) below any tees . secondary containment fails the test. 2 . Connect the vacuum gauge, valve and the 4. 3 Tank Secondary Containment Integrity Testing vacuum-generating device to the fitting on the _ Liquid-Filled Test Method . plumber ' s plug. The valve should be between the vacuum source inlet and the pressure 4. 3 . 1 General . This test method tests the integ- gauge . The gauge should be between the valve rity of the liquid-filled interstitial space . There are and the fitting so it will read the interstitial vac- a number of variables that affect this test, such as uum when the valve is closed . The automatic interstitial space volume, temperature , water table vacuum shutoff valve is located at the inlet of and product level in the primary tank . Refer to the vacuum-producing device and should be Appendix A for specific manufacturers ' test proce- set at a minimum of 10 percent and no more dures . than 2 inches Hg above the test vacuum. 4. 3 . 2 Purpose . This general method is used to 3 . Ensure all connections are airtight . test the integrity of the liquid-filled secondary con- 4. Start the vacuum-generating device , and open tainment of a UST. the valve . 4. 3 .3 Description of Test. Liquid is added to S. Pull the vacuum to 10 inches Hg . Close the the interstitial space of the tank and the level is valve . brought up into the interstitial riser. The liquid level 6 . Allow the vacuum to stabilize for a minimum is monitored for a specified period of time. If the of 5 minutes at the specified vacuum level . If liquid level is maintained, then the containment a stable vacuum cannot be maintained, test system has passed the test. equipment shall be inspected for leakage . j pei .org