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Rewmniended Practices for the Tefsg and Verificationof Spill,Uv ill,Leak Detection and0ndary Containment Equi 6t at UST Facilities sibility of accidentally imposinga high vacuum at could damage the tank.The use of the valve is recommended because it limits the vacuum at can be applied to the ° ers °ti space.); Inchea Hg * vacuum gauge with a range of 0 inches to 30 <20,000 1 inches Hg graduatedincrements of 0.5 inches Fi rgla 1 Hg less; 2 ' 2 toggle valve and vacuum hose; steel * stopwatch or other time-measurement device gable of measuring a 1-s ora t, plumber's pita Pass/Fall l ere is no loss in vacuum level, no liquids inter- 4.2.8 Test Procedure. stitial space during the test duration shown in Thble 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, ® Connect the vacuum gauge, valve and the thereIf is any vacuum lost during the test or liquids vacuum-generating device e fitting on the are drawn plumber'sank plug. e valve should a between o einterstitial space, en e t e vacuo source inlet d e pressure secondary containment fails a test. gauge.The gauge should be between e valve 4.3 Tank Secondary Contairunent Integrity f d the fitting so it will read the interstitial vac- — Liquid-Riled 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 evi should be city of the bquid-filledinterstitial space. There are a set at a minimum of 10 percent and no more number of variables t affect this test,such - inc es Hg above the test vacuum. ti volume, temperature, water le and product level° e of Appendix ° . Era l connections t. for specificmanufacturers'test procedures. . Start the vacuum-generating device, and open e valve. Purpose. °T gen rra is u to test®the integrity of the liquid-Tilled secondary con- S. ll the vacuum to 10 inches I-Ig for fiberglass tainment of a UST. tanks and 6 inches Hg for steel tanks.Close the valve. . i f Test. Liquid is added to e interstitial space of the tank and the level is 6. Allow the vacuum to stabilize for a minimum brought up into the interstitial riser.The liquid level of 5 minutesat 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. a stable vacuum of be - 4.3.4 Test Concittions. The primary contain- tained, the tank secondarycontamment " g- ment may contain any level of product.Determine rity test fails. whether the groundwater depth is above the bottom 7 n the vacuum level stabilizes, record the of the tank,Consult specific manufacturer's proce- vacuum level and the test start e. dures in regards to groundwater and performing the test- No bulk deliveries shall occur withinhours 8. Observe the vacuum level for the period of or to conducting or during the test.No dis ns- e shown in Table -1. ing may occur during the duration of the test. 9. Record e final time and vacuum level. 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 pel.org 01