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ii� ' IRl T ■by VE PptroSTl'MLU leak normal static syvtem prrHsijrr,three GPIvI.Thin is the indiattion to the detector is a three position,pre u;ure- GPH(ut.10 psi)in metered through the operator that a leak in prosaot..If sensing,pislem operated valve STP-MLD into the piping system.Ifo there are no leaks,pressuro rapidly desi;!mmd to continuously monitor the leak is present that equals or exax:ds build.in Lire system forcing the piping Ly indicating any leakage in t1o: thin omouriL,as much prxfueL es.apus STP-MLD to span to Lhc fill-flow piping;between the discharge and the frorn the sy„'dem as is metered throul;h position.In it system with no leaks,it submersible purrq)and the sslelloid the' IV[T-Mid),Under this condition, fnkes approximately Lhren wxwnds for valva in a service HLttion dispenser. pressure umnot boifd up in the piping; a cornplete tUwt.No farther lino ts:Ling Wlu:n dici submerged pump is syst+m.Whnu a nozzle is opened,a Lrkos pluc o until tho line prsaun: turned on alter the system pressuro poppet in the.%Trt-M LI1 moves to a dropH significantly below the canal hat:dmppssl si;!nificautly below the position that mstrictN the flow to 2 static Nysten pressure. i 1 "i 1. The rlYipped or Bottom 2. Leak Sensing Position 3.Non-Leak or Full Flow Position In this position the system pressure Position When the syste.m is less than 1 psi,Lhe has increased to apprtsimMA31y 12 psi This position allows lull(low.The piston and poppet are in Qa: and all the now must Lravol around poppet will remain in approximately "bottom”or"tripped"position. In this the muttering pin which limits it to this position as long nN Lhe system position of the poppet,product.(lows appmxim:darly:1 a OPI I rate(at 10 psi). praessirm remains at a1wut the through the horizontal hole in the pule If thano is a leak in Lim HyHtom which pumping prossum.If the prrHsuro in lu1 and around Lhe metering pin at:t will allow leakage to extend this amount., Lho system drafts when the pump is rah:of uppnrximal4y 2('I,?M the fine prossttrc will notbuild hp.yond turned nil,tidier duo ti thermal now into Qts delivery line when the Lhe foinl.and the valve will romain in contraction of the product or duo too o :nilnnrr.iblo pomp is running,in the leak wmsing position with the main leak,the piston meveH downward:and nartntd ufwratimis the piping!rontaiuH flow blockal.I f thew>it;an attempt to the poppet enisiges tmtl Heels inside full o('lluid and when the subrnemibfe dispunm while the valve in in this poli- the cage at alwut a psi,or approxi- pump is Lurmsl on,Willi n flaw rate of tion,thn line pnssure will drop to leve rrtata.ly 10 feet of head,in yawdine, 2 GPM thmugh tho pwpput.,prow:urr than I psi,flip.piston will respond,and Any time the pump is turned on oftwr builds rapidly and the poppet rmrvns to Lhe poppet will rMarn Lo Position L Ute mml on the poppet is inaide the the fenk t',onsin„position. where 2 GPM will flow to the diNtx:nwtn, cagM,it line test will Io porformod. Ltsaks smaller than a GPH will Iu:imli- calod by the STP-MLD Lakin;lonl,cr than three socrinds Lo open cvmplct:ly because some ol'the now leaks out of the system uud the rest builds pnm. -uro. CC _ _ SEEM �H 2 If there is no leakage in the syatmn, m the small flow around the metering pin MT Pmtro, I nc, 4805 Voges lvuwd .. increases the line prostrate and in P.O. Piox Ulla • McFarland,WI 511558 approximaLely three seconds the piston (608)838-8786 Fi.tx:(608)83&811:3:3 will move the poppet to Position 3. -Cl 2bE9l9jso2 oul s-lozoe.tZuoe nI a1113 eL1t11 So 20 .aeW