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5PC�4� �1Q <br /> DISPENSER <br /> ' ® DISPENSER SOLENOID <br /> ® O VALVE <br /> PRESS,URE GAUGE Do Not Discharge <br /> ' BALL VALVE GRADE Fluld Above This Line <br /> TUBING -� <br /> ' FUSIBLE-LINK <br /> CONTAINER <br /> LI M KNOWN <br /> SAFETY SHUT-OF eye°. TEST PORT IN <br /> VALVE 1. ,e`; SAFETY VALVE F/GURE 2 <br /> FIGURE 1 FROM SUBMERSIBLE PUMP <br /> static head pressure could be placed upon the leak <br /> A 3/8"to VV'reducer may be nec- detector to keep it from entering the leak sensing <br /> ' ® essary depending on the size of position. It is assumed that piping from the leak <br /> the test port in the impact valve. detector to the point of discharge is a continual, <br /> ' <br /> Loss of product as well as intro- gradual upward or positive run and does not have P a negative(declining)run. <br /> duction of air into the system <br /> can he minimized by closing the For more information on static head effects,please <br /> emergency valve previous to re- see Red Jacket Service Bulletin 23-5 and 23-18 or <br /> i moving plug from the test port. the application section of the mechanical leak de- <br /> Reopenvalve after installingthe tactor manual covering the effects of static head on <br /> AVO. mechanical leak detectors. <br /> ' To insure a tight, accurate test If the leak detector or pumping <br /> and to avoid accidental spillage, system operation differs signifi- <br /> check for any leakage of product cantlyfromthat describedin the <br /> ' around any of the fittings on the following duringthe evaluation, <br /> AVO and on dispenser impact see leak detector manual #5191 <br /> valve. and/or Petroleum Products Ser- <br /> The simulated leak used as part vice Manual #5190, for possible <br /> of this procedure must be cre- causes and solutions. <br /> ated at a height between the so- Before starting the test, if.subject LLD is a dia- <br /> valve. valve and the impact phragm LLD,determine whether the leak detector <br /> ' valve. le NOT attempt the <br /> m the system is a current style diaphragm model <br /> form a leak test above the sole- (hex top) or the old style Model 116-011A, five <br /> ' <br /> leak detectors may not react to valve. Properly installed second model (round top).leak <br /> leaks above solenoid valves that <br /> are normally inside dispensers— <br /> 2 Begin the evaluation by closing the ball valve on <br /> sometimes several feet above is- the AVO. The line pressure should be zero as <br /> ' land level. See Figure 2. indicated on the pressure gauge. Start the sub- <br /> mersibleB raisin thedischar a point pump and dispense a few gallons of <br /> Y g g po' gasoline through the dispenser nozzle to re- <br /> from the AVO above the test area,additional static move any air which may have entered the <br /> head is placed on the leak detector. Static head is system when the AVO was being installed. <br /> defined as the pressure exerted on the leak detector <br /> by the vertical column of fluid contained within the IICHECKING FOR RESILIENCY <br /> piping, from the leak detector upward to the point <br /> of discharge of the leak. By placing the point of 3. Turn off the pump and open the ball valve to <br /> discharge high enough above the island, sufficient drop the line pressure to zero. <br /> ' 3 <br />