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FE11IP1200-17 a Underground Fiberglass Daubie and Triple-TV414' Repeat steps 4 and 5 until a stable vacuum is � Tanks- With Dry Annalar Space FTFI 410 M7, achieved. If a stable. vacuum canftot be main- � a_ wined, the tank secondary conrainment inreg- g 4.2.7 Test Equipment. Test equipment shall rity best fails_ include; T. 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 1. 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 a regulator (The shutoff valve can be Set to 9. Record the final time and vacuum level. A close ataredetermined safe level, prevemin i �g p g 10. Check the interstitial space For accumulation $F 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 710 vacuum that can be applied to the interstitial Capacity, Uuratiort, space.); gallons hours • vacuurn gauge with a range of 0 inches to 30inches Hg graduated in increments of 0.5 inches �o Hg or less; � • toggle valve and vacuum hOSe; 4.2.9 Pass/Fall Criteria. If there is no loss in vacuum level, no liquids are drawn into the inter- * stopwatch or other time measu--eanent device stitial space during the test duration shown in Table capable of measuring a 1-second increment; 4.1, and the tarok secondary containment area has � • plumber's plug, no adclitiona: fluid than at the start of the test, then the tank secondary containment passes the rest. 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 riscr(s) below any tees. secondary containment fails the test, 2. Connect the vacuum gauge, valve and the 4.3 Tank Secondary Containment Integrity Testinig vacuum-gemeradng device to the fitting on the _ Liquid-Fitled 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 autornatic interstitial space volume. temperature, water table vacuum shutoff valve is located at the inlet of and product level in th.- primary tank. Refer to the vacuum-producing device and should be Appendix A for specific manufacturers'test proce- set at a minimum of 10 peteent and ao 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 GST. the valve. 43.3 Description of Test. Liquid is added to S. Pu11 the vacuum t4 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 uacuurn 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 ,hail be inspected for leakage. pel.org