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THE XLP. . .3 STEP LEAK TEST The Red Jacket XLP leak detector is hour) is metered through the XLP into flow to approximately 1-1/2 to 3 GPM. a pressure-sensing, piston-operated the piping system. ff 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.' C piping between the leak detector and much product escapes from the system H there are no leaks, pressure rapidlybuilds in the system forcing the XLP to the dispenser. as is metered in through the XLP. open to the full-flow position. In a When the line pressure is at approxi- Under this condition pressure cannot system with no leaks, it takes approxi- mately less than 1 psi and the sub- build up in the piping system. When a mately two seconds for a complete test. merged pump is turned on, a controlled nozzle is opened, a poppet in the XLP No further line testing takes place until amount of product (three gallons per moves to a position that restricts the the line pressure drops below 1 psi. Or 0 Position 1 Position 2 Position 3 Vented Vented Vented to Tank to Tank I to Tank Pressure Relief 20-22 PSI Valve Lessthan 1 PSI \ Full Pressure \ Full Pressure Full Pressure Poppet Approx.25 PSI Approx.25 PSI � Approx,25 PSI E—from Pump �. t—from Pum �, E—from Pum Metering Pin Less than A, 20 to 22 PSI,, A�V �� All Pressure A- ��' 1 PSI - Equal IT.Discharge Line ITo Discharge Line . To Discharge Line 1. The Trip or Relaxed Position. Under 2. Leak Sensing Position. As the If there is no leakage in the system, the normal operating conditions, it is pressure builds to approximately 20 to 22 small flow around the metering pin assumed that the lines are filled with psi (rapidly)the piston has moved the increases the line pressure to 22 psi in gasoline. When the system pressure is poppet to such a position as to almost approximately two seconds at which less than 1 psi, the piston and poppet are stop the flow into the piping through the point the piston will snap the poppet to in their'down'or-tripped-position. The XLP valve poppet. In this position,all Position 3,allowing full flow. Any product position of the valve poppet is such as to the flow must then travel around the relieved through pressure relief valve allow approximately 1-1/2 to 3 GPM flow metering pin which limits it to approxi- during trip position will be vented through into the delivery line through a bypass mately 3 GPH rate. If a simultaneous vent tube to tank. This allows piston to opening in the XLP valve poppet when loss from the system equals or exceeds move freely with no back pressure to the submersible pump starts. Since the this amount, the line pressure will not hamper its movement. system is full, pressure builds rapidly and build beyond this point and the valve will 3. Non-Leak Position. This position allows the poppet moves to the leak sensing remain in the leak sensing position with full flow. The poppet will remain in this position assuming there is no leak the main flow blocked. If there is an position as long as the sytem pressure present. The pressure relief valve attempt to dispense while the valve is in remains above 1 psi. At less than 1 psi, prevents any build up of pressure under this position, the line pressure will drop, the poppet will return to Position 1 and piston when in trip position by allowing the piston will respond,and the poppet the next time the pump is activated, the relief of trapped product. will return to Position 1 where the 1-1/2 XLP will perform a line test. to 3 GPM will flow to the dispensers.' 'If the dispensing system (the solenoid valve and the nozzle)is opened previous to the completion of the line test,the XLP will detect this opening as a leak and restricted flow will result. Closing of the nozzle(s) for a period of time, adequate to allow completion of the line test,will allow the XLP to open. This, in turn,will allow full flow providing there is no additional escape for fuel in the system. k7,17rtMThis product is designed and sold to detect leaks of approximately 3GPH or greater only. For leaks of less than approximately 3GPH, please consult with your Marley Pump Company representative. XLP-31" 3/91 "MARLEY