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double Wa H P:1i'61:�CIiC,III +: 11S LIL'!:S'L <br /> Xerxes.DWT-11 double well tanks with the fRL1 CHEK01i system <br /> option are factory-filled with i trine solution in the iniersticDiagram A <br /> (' <br /> between the two tank walls. Tlae bane trlso f,,if tiny fills a Reservoir <br /> reservoir affixed to the top of the(,ink. This Ca C,ales a hydrosta- Level Down <br /> tic pressure that enables 04vncVJLVV r to rnonitor both the <br /> primary tank and if secorid,ay( u)k walls. <br /> The TRU-CHEK&system provides ,i srnipl( ,and precise method <br /> to perforin a tank-tighfi'iess test. It w<is develoj wd in conjunc- <br /> tion with Dr. Robert Pluokcir, SC.L-7., consUltirr1i c.11gureer (pray <br /> fessor emeritus), University of Minnesota 1141 C HEK0 rios Cj <br /> received third-parry ve(ilicaliun bora) Unclowr LIS <br /> Laboratories. <br /> TRU-CHEKL'�testing rner(s tho I-13A c ruen,r for t,a ik-tightness <br /> testing, which Stdtes that d test rrrust be,rble(0 detect a leak <br /> rate of 0.1 gallon per hour haat n,rny porwon of the Mink that <br /> routinely contains product. The test hers", 9S-,-, f rrob.rbiUry of <br /> detection (PD) and sa ,pit,pta.tr, )flity of lalso dlorm (PVA. In <br /> Other words, out Of 100 Ch.InC('s, the tesl (R-10CisIt'.ib:; 9YA, <br /> of the time. <br /> The test must also account for [tae effects of it i(•rmal expan- <br /> sion or contraction of the product, vapor pc)(kt•Is, tank defor <br /> mation, evaporation, condenstitjon Lind the lo( tion of the Diagram B <br /> water table. <br /> TRU-CHEKu is capable of detecting a loss rite..ts small,-is the Reservoir <br /> NFPA 329 criteria of 0.05 gAlons lmr hour. Level Down <br /> In addition, on extended tests, fRU-CHFK1"t(­;ting oilers 99'ri, <br /> PD and I%PFA. ( � <br /> The TRU-CHEKO test offers significant <br /> benefits to the owner/operator: <br /> .A wide range of tank sizes c'-in be tested, including <br /> Xerxes D1.Vf-II tanks up to 20,000 gC1I1011s <br /> 2.Product can be dispensed during the 951.1o/5% test. <br /> 3.No waiting time is required to start [he le',l as long as.i <br /> NI of new product docs nut vary more it i�in 20"F from <br /> the existing product 1L'rr7Pe1dture. <br /> How continuous monitoring works <br /> It both [ht2 inner ,111LI uu[ei will.LAC Diagram B <br /> fight, the reservoir level will be steible <br /> If there is a fracture in [he inner w,.ill Reservoir <br /> (Diagram A), the brine Ir-vel in the - Level'Up " <br /> reservoir wilt go down. 1-he bring•level v <br /> will also go down if theip is a leak in ;"_ " ^ WaierAbove Level <br /> vel <br /> nk <br /> the outer wall (DiRrgram B). <br /> With a high-water table sand "wet- � Fracture <br /> hole"conditions (Di..igrarn C), .i Outer Waft <br /> leak in the outer wall will C.ruscl <br /> the brine level to go up if the <br /> height of the water [able <br /> above the leak is 30'%u _ <br /> greater than the bine - <br /> level above the WA <br /> See Xerxes TRU-CHEK°" <br /> brochure for mole <br /> details. <br /> 16 <br />