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PEI/RP1 200 - 1 7 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 41 . • 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 the TABLE 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 ; 4.2.9 Pass/Fail Criteria. If there is no loss in • toggle valve and vacuum hose; 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 I -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 city of the liquid4illed 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 i 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. I than 2 inches Hg above the test vacuum. 4.3 . 2 Purpose. This general method is used to s 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 6. 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. i pei . org i