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' The Diaphragm-type Leak Detector...3 STEP LEAK TEST The Red Jacket diaphragm leak If a leak is present which equals or the operator that the leak is present. detector is a pressure-sensing,dia- exceeds this amount,as much product H there are no leaks,pressure rapidly phragm-operated valve designed to escapes from the system as is metered builds in the system forcing the LLD to indicate a leak in the piping between the in through the LLD.Under this condition open to the full-flow position. In a leak detector and the dispenser. pressure cannot build up in the piping system with no leaks, it takes approxi- ' When the submerged pump is turned system.When a nozzle is opened, a mately two seconds for the complete on, a controlled amount of product poppet in the LLD moves to a position test. No further line testing takes place (three gallons per hour)is metered that restricts the flow to approximately until the line pressure drops below 1 psi. through the LLD into the piping system. 1-1/2 to 3 GPM.This is the indication to ' POSITION 1 POSITION 2 POSITION t t LESS THAN t PSI a TO ID PSI LESS FULLPRESSURE APPROX 25 PSI APPROX.2S PSI FULL PRESSURE ' POPPET FROM PULP FROM PUMP APPROX.YROM PUMP / M ERI/ i[E ' OR a QP81+ / STOI PSI + / LLEWAL +` ' 1. The Trip or Relaxed Position.Under poppet to such a position as to almost seconds to open completely.If Mere is no normal operating conditions,it is assumed stop the flow into the piping through the leakage in the system,the small flow that the lines are filled with gasoline. LLD valve poppet.In this position,all the around the metering on increases the When the system pressure is less than 1 flow must then travel around the metering line pressure to 10 psi in approximately psi,the diaphragm and poppet are in their pin which limits it to approximately 3 GPH two seconds at which point the dia- 'down'or'tripped'position. The position rate.If a simultaneous loss from the phragm will snap the poppet to Position 3. of the valve'poppet"is such as to allow system equals or exceeds this amount This all takes place in less time than it approximately 1-1/2 to 3 GPM flow into the line pressure will not build beyond this takes to reset the dispenser,walk to the ' the delivery line through a bypass point and the valve will remain in the leak car,remove the gas tank cap,insert and opening in the LLD valve poppet when sensing position with the main flow open the nozzle. the submersible pump starts.Since the blocked.If there is an attempt to dspense 3. Non-Leak Position.This position allows system is full,pressure builds rapidly and while the valve is in this position,the line full flow.The poppet will remain in this the poppet moves to the leak sensing pressure will drop,the diaphragm will position as long as the system pressure ' position assuming there is no leak respond,and the poppet will return to remains above 1 psi.At less than 1 psi, present. Position 1 where the 1-1/2 to 3 GPM will the poppet will return to Position 1 and 2. Leak Sensing Position.As the pressure flow to the dispensers.Leaks smaller the next time the pump is activated,the builds to approximately 8 to 10 psi than 3 GPM will be indicated by the LLD LLD will perform a line test. ' (rapidly)the diaphragm has moved the taking longer than approximately two t Per the above process, this product is designed and sold to detect leaks of 3 GPH or greater only. For leaks of less than 3 GPH, please consult with your Marley Pump Company representative. ' 7