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' The Piston-type Leak Detector...3 STEP LEAK TEST The Red Jacket piston leak detector hour) is metered through the LLD into flow to approximately 1-12 to 3 GPM. t is a pressure-sensing, piston-operated the piping system. If a leak is present This is the indication to the operator that valve designed to indicate a leak in the that equals or exceeds this amount,as a leak is present.' piping between the leak detector and much product escapes from the system If there are no leaks, pressure rapidly the dispenser. as is metered in through the LLD. builds in the system forcing the LLD to ' When the line pressure is at approxi- Under this condition pressure cannot open to the full-flow position. In a mately less than 1 psi and the sub- build up in the piping system. When a system with no leaks, it takes approxi- merged pump is turned on,a controlled nozzle is opened,a poppet in the LLD mately two seconds for a complete test. amount of product(three gallons per moves to a position that restricts the No further line testing lakes place until ' the line pressure drops below 1 psi. 010 POSITION 1 POSITION 2 POSntON 3 s ' VEMED VEHfED VEWED TOTO TO TANK TANK �. TANK % �/. PRESSURE p-IIm RELIEF VALVE LESS PG S4 1 { / ROLL PRESSURE PULL PRESSURE / `PULL PRESSURE POPPET RPPROY 75 PSI APPPOY IS PSI AIPMY 55 Pa E�PAOY PMP \ �'�FHDY PWP `•� ��PROY PWP YEIEREKL PN \\V \\\ \` LESSTh 1PEI + ' �TO CISDHAMELWE ♦TO DISCHARGE UIE �aIEDRAROE IriE 1. The Trip or Relaxed Position.Under 2. Leak Sensing Position.As the pressure If there is no leakage in the system,the ' normal operating conditions,it is assumed builds to approximately 20 to 22 psi small flow around the metering pin that the lines are filled with gasoline. (rapidly)the piston has moved the poppet increases the line pressure to 22 psi in When the system pressure is less than 1 to such a position as to almost stop the approximately two seconds at which point psi,the piston and poppet are in their flow into the piping through the LLD valve the piston will snap the poppet to Position "down-or'tripped"position.The position poppet In this position,all the flow must 3,allowing full flow.Any product relieved of the valve poppet is such as to allow then travel around the metering pin which through pressure relief valve during trip approximately 1-1/2 to 3 GPM flow into limits it to approximately 3 GPH rate.If a position will be vented through vent tube the delivery line through a bypass simultaneous loss from the system equals to tank.This allows piston to move freely opening in the LLD valve poppet when or exceeds this amount,the line pressure with no back pressure to hamper its ' the submersible pump starts.Since the will not build beyond this point and the movement. system is full,pressure builds rapidly and valve will remain in the leak sensing 3. Non-leak Position.This position allows the poppet moves to the leak sensing position with the main flow blocked. If full flow.The poppet will remain in this position assuming there is no leak there is an attempt to dispense while the position as long as the system pressure ' present.The pressure relief valve valve is in this position,the line pressure remains above 1 psi.At less than i psi, prevents any build up of pressure under will drop..the piston will respond,and the the poppet will return to Position 1 and piston when in trip position by allowing poppet will return to Position 1 where the the next time the pump is activated,the relief of trapped product. 1-1/2 to 3 GPM will flow to the dispens- LLD will perform a line test. er5.' 'If the dispensing system(the solenoid valve and the nozzle)is opened previous to the completion of the line test,the LLD will detect this opening as a leak and restricted flow will result.Closing of the nozzle(s)fora period of time,adequate to allow completion of the line test,will allow the LLD to open. This,in tum,will allow full flow providing there is no additional escape for fuel in the system. ' 111Tr977M 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. ' 6