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' Diaphragm Model-No more than 1 to 3 oz.(about pump pressure.This indicates 1/2 cup), or 50 to 110 ml of that the LLD is opening prop- product should drain from the erly. line. If desired, RECORD opening ' Piston Model - No more than 11 to 14 oz.(about time in test chart. (See sample 1-1/2 cups),or 350 to 410 ml of test chart on Page 8.) product should drain from the * This is the point at which the LLD is in the leak ' line. * Leave the valve open for approximately 60-90 sensing(metering) position- step 2 of the 3 step seconds after zero line pressure is obtained. test shown on pp. 6 and 7. This allows the piston to reset. ' If larger amounts of product are measured,it is SIMULATED LEAK TEST possible air is still present in the system. 5. A simulated leak can be placed on the system by First turning off the submersible pump, fully ' III. OBSERVATION OF LEAK DETECTOR opening the ball valve to drop pressure to zero. OPENING TIME For piston model LLD's, experi- 4. Next,close the valve and start the submersible ence has shown that if product is pump for: still drippingfrom the discharge Diaphragm Model -The line pressure should rise hose after approximately one to approximately 8 to 12 psi minute,usually within the next immediately*. On a current 60 seconds, a small stream of i style diaphragm LLD,the line fluid will spurt out. This is an pressure should then rise to indication that the leak detector full pump pressure, 26 to 30 has dropped into the leak sens- / ' psi,in approximately two sec- ing position. l onds. (On the old style it will With the ball valve fully open to allow a leak take five seconds.)Because rate,Restart the submersible pump leaving the flow is allowed into the dis- dispenser nozzle closed.Depending on the size '. charge line by the leak detec- of the leak through the ball valve,the pressure for when approximately 12 psi gauge may read from 0 to 13 psi for diaphragm is realized under the dia- models,or from 0 to 22 psi for piston models. phragm(this takes the poppet 6. Throttle down the flow rate through the ball to Position 3 on the 3-step leak test), you probably will not valve until the simulated leak is at the desir- ' detect a pause on the pressure able rate. See chart below. gauge at the 12 psi positionbut Leak Rate Conversion Chart will see a jump from approxi- DIAPHRAGM DIAPHRAGM PISTON PISTON ' mately 8 psi to full pump pres- GPH IN OZIMIN CUMIN 0VMIN sure (approximately 26 to 30 1 63 2.13 93.44 3.16 psi,depending upon the horse- 2 126 4.26 186.88 6.32 ' power of the pump motor) in 3 189 6.40 280.33 9.48 the prescribed time.This indi- 4 252 8.50 373.77 12.64 cates that the leak detector is 5 315 10.70 467.22 15.80 operating properly. 6 378 12.80 560.66 18.96 ' Piston Model - The line pressure should rise 7 441 14.90 654.10 22.12 to approximately 17 to 22 psi 8 504 17.10 747.55 25.28 immediately.The linepressure 9 567 19.20 840.99 28.44 ' should then rise to full pump 10 630 21.30 934.44 31.60 pressure, 26 to 30 psi, in ap- proximately two seconds.You NffTr.TffM The above are calculated flows 1 may notice a slight dip in pres- on a typical Ml valve and are for sure on the pressure gauge at referenceonly.Actualflowsmay approximately 17 to 22 psi* vary from valve to valve. then an immediatejump to full The dispenser nozzle can now be opened and the ' 4