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PEIIRP120n-12 <br /> 4.2.4 Praparatlan. The procedures in thjs sec- 4.2.7 Yes# Equlpm nL 7 -sL c:quipiritmt shall <br /> tio,'n arc general in n,glum and tvfler:l lltc suggublel include: <br /> vacuum levels and hold li;=s for testing tank a vacuum-generating device thal can be used in <br /> secondary contalnment areas. Consult tank manu- a brass I, Diy4Lion I area callahle of pulling 15 <br /> facturc.r and autherilp having jueNdictinn (AHI) 111 �� g} <br /> {;l'E�4 1]f tltC'�<.UL f4 wUtkiil; <br /> guidelines before pexfcu'rniag thew;: tc sts as their <br /> irgnirerneids may diffen f an automatise vacuum shutoff valve sir vacuum <br /> rcgEtlatc}r('Ibe shutaffwalve can be set to time at <br /> Determine,if these is liquid present in tlx: intm-66- a predelernnined safe level, pmventing Lbo pers- <br /> tial. space.If liquid is fouad, da mtim if fire fiuki <br /> is welts or prcducl, anti Ymtttove it fad the extent <br /> The hydrustatic pressure irom a high waver table <br /> imposes inward pressure on the outer wall of a <br /> tlS P. Applying s vamluill in Elie interstitial space � r <br /> of the ta&a-oatas additional pros om on the outer <br /> wall. These combined forces can damage Lhe <br /> scenndary Eat& wall when there is a large det1ned <br /> space bumuca the primary and secondary tAnka, <br /> Cnn.wquently, to prevent dalliage to Lhe lank. it is <br /> important I r3 crve the water tahlc Rind a�nciuted <br /> mconmtcnded vacuum levels whoa testing, , <br /> Veto tits p6nary tank to attrtesphere during Um FIGURE 4-3. The vaotium 9aWe and control valve used <br /> test. fa tarty ir,lemUtlal rmtlrtg. <br /> L some installations, the tank inteastitia] space <br /> may be vented to mininii7e the buildup of condea- f <br /> mU nt. lu ihcsc c ascs, seal nfr stty vent Lines to the <br /> tank interstitial Fpam price' Lo lcstiug. f°= <br /> Derertnine the volume of the tank. This infornta- „ - <br /> don is available front facility records ur the auto- r - <br /> matic lank gaksge-(ATE r) rrstdnut. <br /> 4.2.5 Steel Tanks. Determine if the interstitial <br /> space is a °"tighL wrap" design or a "I t �Qtrtaitt- } <br /> ment" design. '[lurks with a I 10% con[ainnwnL k. <br /> dc4 sigti $herald use the latest version of Steel Tank <br /> InstituW!' (STI) Recommended Pructre. R01 , <br /> Recotnmerrrfed Practlee for Inlerslflkrf 7Fglurmess <br /> '&Yung of IA?sihr g Underground Double Wilt Am <br /> Teinks fnr feasting. , <br /> Fair tight wrap tanks, use the lest me-thee in this <br /> sccLion, <br /> 4.2.6 Fiberglass Tanks. Dctc-renitw-if the infer- <br /> Stitia;l spEY a iA a "tight wrap" design or a "IIU <br /> ennlainment"design, Dither type of fiberglass tank <br /> may use this test, or the latest version of Mber- <br /> glam Tank dr. Pipe M.Nlitule% Field Test Prviocof " <br /> for Tcsfiag lire Annular Space of Insfailed Under- FIGURE 4-4. The pivmber's plug provides 8 leak#fight <br /> ground Pberglass Double m?d T'rxple-wuli 74ukv connectan to draw a vacuum are the lank interstitial <br /> with fury Annuirar Space, FT&PI 4MI.M. space. <br /> pei.org <br />