COMPLIANCE INFO_1985-1997 - Laserfiche WebLink

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IrHF. RED Jj �_4@KFlr The Red Jacket leak detector is a pressure sensing, diaphragm operated valvedesigned to indicate a leak in the piping between the leak detector and dispenser. When the submerged pump is turned on, a controlled amount of product (three gallons per hour) is metered through the leakdetector into the piping system. If a leak is present POSITION / LESS THAN 1 PSI FULL PRESSURE APPROX. 25 PSI FROM PUMP 11 oe?,11 I iA 1. THE "TRIP" OR RELAXED POSITION. Under normal operating conditions, it is assumed that the lines are filled with gaso- line. When the system pressure is less than 1 psi, the diaphragm and poppet are in their "down"or"tripped"position. The position of the valve "poppet" is such as to allow ap- proximately 1-1/2 to 3 gpm flow into the delivery line, through a bypass opening in the leak detector valve poppet, when the submersible pump starts. Sincethesystem is full, pressure builds up rapidly and the poppet moves to the leak sensing position assuming there is no leak present. 2. LEAK SENSING POSITION. As the pres- sure builds to approximately 8 to 10 psi (rapidly), the diaphragm has moved the Form No. 5170 Rev. 6/89 which equals or exceeds this amount, as much product escapes from the system as is metered in through the leak detector. Under this condition pressure cannot build up in the piping system. When a nozzle is opened a poppet in the leak detector moves to a posi- tion which restricts the flow to approximately 1-1/2 - 3 GPM. This is the indication to the POSITION 2 8 TO 10 PSI FULL PRESSURE APPROX. 25 PSI FROM PUMP ` ff MMEETERIN 8 TO 10 PSI .+. / poppet to such a position as to almost stop the flow into the piping through the leak detector valve poppet. In this position, all the flow must travel around the metering pin which limits it to approximately 3 gph rate. If a simultaneous loss from the sys- tem equals or exceeds this amount, the line pressure will not build beyond this point and the valve will remain in the leak sensing position with the main flow blocked. If there is an attempt to dispense while the valve is in position, the line pressure will drop, the diaphragm will respond, and the poppet will return to position 1 where 1 -1 / 2 to 3 gpm will flow to the dispensers. Leaks smaller than 3 gpm will be indicated by the Leak Detector taking longer than RE JACKET PunnPs A Marley PuRW CmWaM 5= Fovidge Dr., Mission, KS 66202, (913) 831-5700 operator that the leak is present. If there are no leaks, pressure rapidly builds in the system forcing the leak detector to open to the full -flow position. Ina system with no leaks it takes approximately two seconds for the complete test. No further line testing takes place until the line pressure drops below 1 PSI. approximately two seconds to open completely. If there is no leakage in the system, the small flow around the meter- ing pin increases the line pressure to 10 psi in approximately two seconds at which point the diaphragm will snap the poppet to position 3. This all takes place in less time than it takes to reset the dispenser, walk to the car, remove the gas tank cap, insert and open the nozzle. 3. NON -LEAK POSITION This position al- lows full flow. The poppet will remain in this position as long as the system pres- sure remains above 1 psi. At less than 1 psi the poppet will return to position 1 and the next time the pump is activated, the Leak Detector will perform a line test.