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• Jul 23 02 02: 02p Mt'D Petroleum Engineering 91t'-984-1117 p. 5 SHIELD. HARPER & Cl, +� 1 1 I I ; CHARACTERISTICS The FS Petro STP-ML.1)leak norntnl RLatzc systnm pressure,three GPM.Thiw is the indication to the detector zu a three position,orczsurc- GFH(at 10 pill)19 mrtpred through the operator thnL a leak is pmsex,t..If sensing,pietou oporOtod valve STP-MLD into the piping system,if a therr are no le"kR,pressure Topzdly designed to continuouply morntvrthX leaks present tont equals nr exceeds builds in the syoteet forcing the piping by indicating any leaknge in Or this amount,as much pruducl.escapes STPALD to open to the full4low piping between the discharRe and the fiurn the 15,ynteru ay ts,nrteriel tluTn%h prrortxuxt.In n ryatcm with no leaks,it submersible pump and the aolennid the STY-Mho Under this condition, takes approximately three neconda for valve in a service stabnn dispenser. preonure cannot build up in the ptpi* it complete tat.No further line testing Whan the submerged pump is system,when a nozzle is opened,x lake2 place until the line prresurr turned on after the system pressure poppet to thr.STP-MIA moves to R drops szgniflcontly below the normal has dropped significantly below the position ghat tr_atrictR the flow to 2 static system prC9913re, 1 y � I k { Y � ! k , tl d r i T. The Tripped or Bottom 2-Leak Sensing Position 3. Non-Leak or Full Flow Position In this position clic system pressure Position When the avz em is Icsa than 1 psi,the has increased to approximately 12 psi This position allows full flow.The piston and poppet arc in the and all the flow suet travel amend poppet will remain in approximately "batlorn"or"tripped"position.In this- the metenng pin which limits it to this pouition as long aP the system position of the poppet,pzvduct flows approximately a 3 GPH rate(at 10 psi). presswre remains at about the thruugh the horizontal hole in thv pop- If there fa a leak in the ayatem whidz pumping prrssuro.If the prosetur in pct and around rhe metering pin at R will allow leakage to exceed this amount, lho 4"tern eirnlm when the 1x,tntP in rate of approlamatoly 2 GPM Utc line pressure will not build beyond tumed off;either due to thermal now into the delivery tine when the this point and the valve will remain in contraction of the product or due to a submersible pump is running,In the leak sensing position with the main leak,the piston rnoveR downwRrd and normal operations the piping remains flow blocked.If there is an attempt to the poppet engages and scale inside hill of fluid and when the submersible dxspenso while the valve is in this posi• the cage at about 3 psi,nr approxi- pump is turned on,with a-flow rate of tion,the luta pressure,will drop to Teas mately 10 feet of head,in gaAolirw. 2(rpm thrnuglx the 1N11pe!t.,l"RAIMP than I p.i,tho rf ftt.n will"Vebrtd,And Any time the pump ie turned on after builds rapidly and the poppet mover:to the Poppet will return to Position 1 rhe Mal on the poppaiis inside the the leak sensing position, where 2 GPM will now to the diapensers, cage,a line test will be performed. Leaks smaller than 3 GPli will be indi- cated by the STP-MLD takmi;longer than three Seconds to open tornpletely because aome of the now Ieaks out of the system and the rept builds pressure, FE " Y If there io no leakage in the system, the Pmall flow around the metering pin F8 Prlro,Inc..4805 Vogeu Road imrrcam the line pzwuuv and in P.Q.Box l39■ McFarland,WI 63558 appnrxun+ately three"el;11318(.uie piRGnx (4308)838-8786- Fax.(806)fi38-64J3 will move the poppet to Position 3.