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PEI/RP1200-1 <br /> 4.2.4 Preparation. s in s - 4.2.7 Test Equipment. Test equipment shall <br /> can are general in nature t the suggested ince <br /> vacuum levels and hold times for testing t=k ® a vacuum-generating devi t can be used i <br /> secondary n ° ent areas. Consult tank manu- a Class I,Division 1 area capable of pulling 1 <br /> facturer and authority having jurisdiction f inches of mercury(Hg)vacuum; <br /> guidelines befo o g these <br /> . automatic vacuum s oto valve or vacuum <br /> requirements y differ ,gulato <br /> rr <br /> r e shutoff valve can be set to close at <br /> Determine if there is liquid present in e ' tersti- a predetermined safe level, preventing the pos- <br /> tial space. If liquid is found,determine if the fluid <br /> is water or product, and remove it to the extent r <br /> practicable. <br /> The hydrostatic pressure from a high water table <br /> imposes inward pressure on the tauter wall of a <br /> UST. Applying a vacuum to the interstitial space � <br /> of the tank creates additionals on the our ti4il <br /> a <br /> These combined forces can damage the <br /> secondary tank wall when theme is a large defined <br /> space between the primary d odary tanks. <br /> �� .. <br /> Consequently, to prevent damage to the tank, it is <br /> important to observe the water table and associated <br /> recommended vacuum levels when testing. <br /> Vent the primary tank to atmosphere during the U . The vacuum gauge and control valve used <br /> test. <br /> for tank lnterstl0a) testing. <br /> In some installations, the tic interstitial space <br /> may be vented to minimize the buildup of conden- <br /> sation.In these cases,seal off any vent lines to the <br /> tank interstitial space prior to testing. <br /> Determine the volume of the tank. This informa- <br /> tion is available from facility records e auto- <br /> matic <br /> uto-r tic tank gauge(ATG)readout. <br /> 4 <br /> 4.2.5 Steel Tanks. Determineif the interstitial <br /> space is a"tight wrap"design or a"110%contain- <br /> ment!' <br /> n °t" design. Tanks with a 110 containment <br /> design should use the latest version of Steel Tank <br /> Institute's (STT) Recommended Practice R'012, <br /> Recommended Practice for Interstitial Tightness <br /> Testing of Existing Underground Double Wall Steel < <br /> Tanks for testing. � s` <br /> For tight wrap tanks, use the test method in this <br /> section. <br /> is <br /> 4.2.6 Fiberglass Tanks. Determine if the inter- <br /> stitial space is a "tight wrap" design or a "110% <br /> cont ' ene'design..Either type of fiberglass tank <br /> may use this test, or the latest version of Fiber- , <br /> glass Tank & Pipe Institute's, Field Fest Protocol <br /> for Testing the Annular Space of Instaalled Under FIGURE 44. 'The plumber's plug provides a leak-tight <br /> ground Fiberglass Double and Triple-wall Tanks connection to draw a vacuum on the tank interstitial <br /> with Dry Annular Space, Fr&PI 4/01/07 space. <br /> 0 L. t <br />