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PEI/RP12O0 1 Z 4.2.4 Preparation. The procedures in this sec- 4.2.7 Test Equipment. Test equipment shall tion are general in nature and reflect the suggested include: vacuum levels and hold times for testing tank . a vacuum-generating device that can be used in secondary containment areas. Consult tank manu- a Class 1, Division 1 area capable of pulling 15 facturer and authority having jurisdiction (AHJ) inches of mercury(Hg) vacuum: guidelines before performing these tests as their requirements may differ. - an automatic vacuum shutoff valve or vacuum regulator(The shutoff valve can be set to close at Determine if there is liquid present in the intersti- a predetermined safe level, preventing the pos- tial space. If liquid is found, determine if the fluid _T is water or product. and remove it to the extent practicable. The hydrostatic pressure from a high water table imposes inward pressure on the outer wall of a UST. Applying a vacuum to the interstitial space J "` of the tank creates additional pressure on the outer ' wall. These combined forces can damage the secondary tank wall when there is a large defined space between the primary and secondary tanks. ti ` Consequently, to prevent damage to the tank, it is important to observe the water table and associated ,+ recommended vacuum levels when testing. Vent the primary tank to atmosphere during the FIGURE 4-3. The vacuum gauge and control valve used test. for tank interstitial testing. In some installations. the tank interstitial space may be vented to minimize the buildup of conden- sation, in these cases. seal off any vent lines to the tank interstitial space prior to testing. Determine the volume of the tank. This informa- Lion is available from facility records or the auto- matic tank gauge (ATG) readout. 4.2.5 Steel Tanks. Determine if the interstitial space is a "tight wrap"design or a"I 10% contain- ment" design. Tanks with a 11O%, containment design should use the latest version of Steel Tank institute's (STI) Recommended Practice R012, Recommended Practice for Interstitial Tightness Testing of F..xisting Underground Double Wall Steel Tanks for testing. �v For tight wrap tanks. use the test method in this --�_ section. 4.2.6 Fiberglass Tanks. Determine if the inter- stitial space is a "tight wrap" design or a "I1O%r Oil containment"design.Either type of fiberglass tank may use this test. or the latest version of Fiber- glass Tank & Pipe Institute's, Field Test Protocol for Testing the Annular Space of Installed [Inder- FIGURE 4-4. The plumber's plug provides a leak-tight ground Fiberglass Double and Triple-wall Tanks connection to draw a vacuum on the tank interstitial with Dry Annular Space, FT&PI 4/01/07. space.