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4 . 2.4 Preparation , Tile_ procedures in this secs <br /> Tet Equipment . 'rest ecluiprrrcarit shaall <br /> licit§ are.: t,l nerarl in natuw atilt reflect the ;!aro eastt d itrcluclet <br /> vacmirlt levels and hold times f'ov lesting tan <br /> Al v4re l um- eneratsai cle v rce" tlrtit Cain lies naCd rrr <br /> sea`amddry containment areas. Consult tank matiry <br /> tr Class 1 , t_) ivisiein I area capable Cil' pulling 15 <br /> t..actuter and authority having jttrrsdic"titin ( ,'`HJ ) Inches ell' riier'etiry ( 1-1g ) vacuum , <br /> guidelines he; lOre performing these tents las their <br /> requirements may differ. 4111 aantanratic vacuttrtt shutrrtf valve or Valcutarn <br /> revulator (Flic Nhutolf valve can he^ , ;ct tis close tit <br /> Determine if there is lign)(l polsent in the hitersti a1 pr iyalcterlrliraacE r, ;ifc level , preventing the pos- <br /> tal spate . If liquid is found , doerinfile if itte. 1'111141 <br /> is water ran prcicluci . :°incl retrilovv. n to the extent Il' <br /> practicable , <br /> The hydrostatic pressure from ai hq-th water raable• <br /> it :rposes inwaard pressure lair tbe outer will of u <br /> 411', sIpilyinf= 4r vaeuuni to flic ititettiti ; tl xpaee <br /> of the tau@ik creates rtdelttttitial irCstitlrt" (-)ittilt' tauter' <br /> l <br /> wall . These celmhineel forces can datnalge thio <br /> secondary tank wall when there is at large delinecl <br /> at <br /> space between they primary and secondary ranks . �t`I <br /> C onseaeluentiv, to prevent daamaaoc to the tank, it i <br /> important to observe they water table and associated 3 <br /> a <br /> recommended v' ;aaumn levveh when testing , " <br /> Vern the: primary tank to atmosphere during the FIGURE 413 , The vacuum ga o e. and crintrol valve, used <br /> for tank interstitial testing. <br /> test ___._- ....... <br /> t <br /> In some inmallaations, the tank tnterstittaal Space <br /> may he volued to nintlurize the huiltlulr of c ondon <br /> cation , In then e' a� s , sc. a1 off ;ani' vent lines to til <br /> tank Interstitial ti4al silaice prior lei test nfr . <br /> Determine min the volume of the tank . `Chis informal. <br /> tion is available from facility records or the aauto-. ` <br /> matte t ;urk lrattrg ( ATG ) readout, <br /> h " <br /> 4 . 2 . 5 Steel Tanks, Determine it' the: interstitiral <br /> spatce is as "fight wrap" design or at " I 10% contain- <br /> ment " <br /> ontain are:tit " design . "TankF with 4.1 11011 containment <br /> design should use; the latest version of Steel Tank <br /> Institute " s; ( STI ) Re 'e 'cirrirraetrded Practice R0121 <br /> j Inc e curarine"rlcl el I'reae °rir ' > rtr Interstitial T1.� httress <br /> ., <br /> Testlrr,q c >1 Exr's•ta1tg tlrrcic°rgrrsrarrrl hirrrchle W<rll .Stc=rT1 d �° <br /> Wink.v for tosant? , ` = <br /> F )r tight wrap tanks , use the test method in this <br /> section . <br /> ; <br /> E g <br /> 4, 2 .6 Fiberglass Tanks . De.te: rmine, if the inter- a <br /> stinal space is as ' `tight wrap" design or as " I 10le - <br /> containment" desit7n . Either tvpe: of fiberglass tank <br /> may use this test, or the latest version Of riber- <br /> ,ylass link P ' er Inrstirmes, f"WId 'Fest Protocol <br /> .fixe 7i�,vtr'erg the Annulai- Space of Installed thldeI4 FIGURE 4A The lilarartier 's 1pldlg provides a leak - fight <br /> ground I"ilaeigltt.v-v Double and 7HlliV situp links connection to drain ri vacuum on the tank interstitial <br /> u itlr I f-v Annular .Shue: • F1'&PI 4101 /071 space. <br /> pais <br /> C <br /> i <br />