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PEI/RP1200-17 pei.org10 Underground Fiberglass Double and Triple-Wall Tanks With Dry Annular Space FTPI 4/01/07. 4.2.7 Test Equipment. Test equipment shall include: • a vacuum-generating device that can be used in a Class I, Division 1 area capable of pulling 15 inches of mercury (Hg) vacuum; • an automatic vacuum shutoff valve or vacuum regulator (The shutoff valve can be set to close at a predetermined safe level, preventing the possibility of accidentally imposing a high vacuum that could damage the tank. The use of the valve is recommended because it limits the vacuum that can be applied to the interstitial space.); • vacuum gauge with a range of 0 inches to 30 inches Hg graduated in increments of 0.5 inches Hg or less; • toggle valve and vacuum hose; • stopwatch or other time measurement device capable of measuring a 1-second increment; • plumber’s plug. 4.2.8 Test Procedure. 1.Install the plumber’s plug in the interstitial riser(s) below any tees. 2.Connect the vacuum gauge, valve and the vacuum-generating device to the fitting on the plumber’s plug. The valve should be between the vacuum source inlet and the pressure gauge. The gauge should be between the valve and the fitting so it will read the interstitial vac- uum when the valve is closed. The automatic vacuum shutoff valve is located at the inlet of the vacuum-producing device and should be set at a minimum of 10 percent and no more than 2 inches Hg above the test vacuum. 3.Ensure all connections are airtight. 4.Start the vacuum-generating device, and open the valve. 5.Pull the vacuum to 10 inches Hg. Close the valve. 6.Allow the vacuum to stabilize for a minimum of 5 minutes at the specified vacuum level. If a stable vacuum cannot be maintained, test equipment shall be inspected for leakage. Repeat steps 4 and 5 until a stable vacuum is achieved. If a stable vacuum cannot be main- tained, the tank secondary containment integ- rity test fails. 7.When the vacuum level stabilizes, record the vacuum level and the test start time. 8.Observe the vacuum level for the period of time shown in Table 4-1. 9.Record the final time and vacuum level. 10.Check the interstitial space for accumulation of liquids. TABLE 4-1 Vacuum, inches Hg Capacity, gallons Duration, hours 10 <20,000 1 20,000+ 2 4.2.9 Pass/Fail Criteria. If there is no loss in vacuum level, no liquids are drawn into the inter- stitial space during the test duration shown in Table 4.1, and the tank secondary containment area has no additional fluid than at the start of the test, then the tank secondary containment passes the test. If there is any vacuum lost during the test or liquids are drawn into the interstitial space, then the tank secondary containment fails the test. 4.3 Tank Secondary Containment Integrity Testing — Liquid-Filled Test Method. 4.3.1 General. This test method tests the integ- rity of the liquid-filled interstitial space. There are a number of variables that affect this test, such as interstitial space volume, temperature, water table and product level in the primary tank. Refer to Appendix A for specific manufacturers’ test proce- dures. 4.3.2 Purpose. This general method is used to test the integrity of the liquid-filled secondary con- tainment of a UST. 4.3.3 Description of Test. Liquid is added to the interstitial space of the tank and the level is brought up into the interstitial riser. The liquid level is monitored for a specified period of time. If the liquid level is maintained, then the containment system has passed the test.