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OPERATING Iit CHARACTERISTICS SIR The FE Petro STP-MLD leak detector static system pressure,3 GPH leak is present.If there are no leaks, is a three position,pressure-sensing, (at 10 psi)is metered through the pressure rapidly builds in the system piston operated valve.It is designed to STP-MLD into the piping system.If a leak forcing the STP-MLD to open to the full- continuously monitor the piping is present that equals or exceeds this flow position.In a system with no leaks, between the discharge of the amount,as much product escapes from it takes approximately two to three submersible turbine pump and the system as is metered through the seconds for a complete test.No further the solenoid valve in a service STP-MLD.Under this condition,pressure line testing takes place until the line station dispenser. cannot build up in the piping system. pressure drops significantly below the When a nozzle is opened,a poppet in the normal static system pressure with the When the submerged turbine pump is STP-MLD moves to a position that pump off. turned on after the system pressure has restricts the flow to less than 3 GPM.This dropped significantly below the normal is the indication to the operator that a r I .,r 1. The Tripped or Bottom 2. Leak Sensing Position 3. Non-Leak or Full Flow Position In this position,the system pressure has Position When thesystem pressure is less than increased to approximately 12 psi.All the This position allows full flow.The poppet 1 psi,the piston and poppet are in the flow must travel around the metering will remain in approximately this "bottom"or"tripped"position.In this pin which limits it to approximately a 3 position as long as the system pressure position,product flows through the GPH rate(at 10 psi).If there is a leak in remains at about the pumping pressure. horizontal hole in the poppet and the system which will allow leakage to If the pressure in the system drops when around the metering pin at a flow rate of exceed this amount,the line pressure the pump is turned off,either due to approximately 2 to 3 GPM into the will not build beyond this point and the thermal contraction of the product or delivery line when the submersible valve will remain in the leak sensing due to a leak,the piston moves pump is running.In normal operation position with the main flow blocked.If downward and the poppet engages and the piping remains full of fluid and when there is an attempt to dispense while the seals inside the cage at about 3 psi,or the submersible pump is turned on,the valve is in this position,the line pressure approximately 10 feet of head,in flow rate of less than 3 GPM allows the will drop to less than 1 psi,the piston will gasoline.Any time the pump is turned pressure to build rapidly,moving the respond,and the poppet will return to on after the seal on the poppet is inside poppet to the leak sensing position. Position 1 where less than 3 GPM will the cage,a line test will be performed. flow to the dispensers.Leaks smaller than 3 GPH will be indicated by the STP- MLD taking longer than three seconds to Z open completely because some of the — = = = �. _... flow leaks out of the system and the rest_ FE Petro,Inc,■4805 Voges Road builds pressure.If there is no leakage in P.O.Box 139 r McFarland,WI 53558 the system,the small flow around the (608)838-8786■Fax:(608)838-6433 _ metering pin Increases the line pressure Ell, Jepetro@fepetro.cum and in approximately three seconds Website:http://w-ww.fepetro.com the piston will move the poppet to From USA&Canada Phone: Position 3. 800-225.9787 From Mexico Phone:001-800-738-7610 MLDB001 7/99