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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities sibility 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.) ; Tank V uum, Capacity, Duration, Type Inches Fog gallons hours ® vacuum gauge with a range of 0 inches to 30 < 20,000 1 inches Hg graduated in increments of 0.5 inches Fiberglass 10 Hg or less ; 20,000+ 2 < 20,000 1 ® toggle valve and vacuum hose; steel 6 20,000+ 2 A stopwatch or other time-measurement device IIIIIIIIIM capable of measuring a 1 -second increment; plumber' s plug. 4. 2.9 Pass/Fall Grtteria . If there is no loss in vacuum level, no liquids are drawn into the inter- 4. 2.3 Test Procedure. stitial space during the test duration shown in Table 4. 1 , and the tank secondary containment area has 1 . Install the plumber 's plug in the interstitial no additional fluid than at the start of the test, then riser(s) below any tees . the tank secondary containment passes the test. 2 . Connect the vacuum gauge, valve and the If there is any vacuum lost during the test or liquids vacuum-generating device to the fitting on the are drawn into the interstitial space, then the tank plumber's plug. The valve should be between secondary containment fails the test. the vacuum source inlet and the pressure gauge. The gauge should be between the valve 4.3 Tank Secondary Containment Integrity Testing and the fitting so it will read the interstitial vac- ® Liquid.Fllied Test Method , uum when the valve is closed. The automatic vacuum shutoff valve is located at the inlet of 4.3.1 General. This test method tests the integ- the vacuum-producing device and should be rity of the liquid-filled interstitial space. There are a set at a minimum of 10 percent and no more number of variables that affect this test, such as inter- than 2 inches Hg above the test vacuum. stitial space volume, temperature, water table and product level in the primary tank. Refer to Appendix 3. Ensure all connections are airtight. A for specific manufacturers ' test procedures. 4. Start the vacuum-generating device, and open the valve. 4.3 .2 Purpose. This general method is used to test the integrity of the liquid-filled secondary con- t. Pull the vacuum to 10 inches Hg for fiberglass tainment of a UST. tanks and 6 inches Hg for steel tanks . Close the valve. 4.3.3 Description of Test. Liquid is added to the interstitial space of the tank and the level is S . Allow the vacuum to stabilize for a minimum brought up into the interstitial riser. The liquid level of 5 minutes at the specified vacuum level. If is monitored for a specified period of time. If the a stable vacuum cannot be maintained, test liquid level is maintained, then the containment equipment shall be inspected for leakage. system has passed the test. Repeat steps 4 and 5 until a stable vacuum is achieved. If a stable vacuum cannot be main- 4.3.4 Test Conditions. The primary contain- tained, the tank secondary containment integ- ment may contain any level of product. Determine rity test fails. whether the groundwater depth is above the bottom T. When the vacuum level stabilizes, record the of the tank. Consult spec manufacturer's proce- vacuum level and the test start time. lures in regards to groundwater and performing the test. No bulk deliveries shall occur within 8 hours S. Observe the vacuum level for the period of prior to conducting or during the test. No dispens- time shown in Table 4- 1 . ing may occur during the duration of the test. 9 . Record the final time and vacuum level. 4 .3. 5 Preparation. Determine the volume of 10. Check the interstitial space for accumulation of the tank and identify the test being performed . liquids . Tank volume information is available from facility pei .org 0