COMPLIANCE INFO_1990-2001 - Laserfiche WebLink

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1 THE RED JACKET 3 -STEP LEAK TEST Ir m the The Red Jacket Leak detector is a pros, sure sensing, diaphragm operated valve de- signed to Indicate a leak in the piping be, tween the leak detector and dispenser. When the submerged pump Is turned on, a controlled amount of product (three gal- lons per hour) is metered through the leak detector Into the piping system. If a leak Is present which equals or exceeds this 1. THE "TRIP" OR RELAXED POSITION NEAR ATMOSPHERIC PRESSURE LESS THAN 1 PSI 25 \`I POP ' I •� I I iROMPPUIMP PET - 9-- \` \ I E NANI PSI ,�, 1. 0 2. THE "TRIP" OR RELAXED POSITION. Under normal operating conditions, It Is assumed that the lines are filled with gasoline which is essentially non-com- pressible. When the system pressure is less than 1 PSI, the diaphragm and pop- pet Are In their "down" or "tripped" posi- tion. The position of the valve "poppet" is auah as to allow appo►xlmately 3 GPM flow Into the delivery line, through a by- pass opening In the leak detector valve poppet, when the submersible Pump starts, Since the system Is full, pressure builds instantly and the poppet moves to the leak sensing position, assuming there is no leak present. LEAK SENSING POSITION. As the pres• sure builds to approximately 8 to 10 PSI amount, as much product escapes o system as Is metered In through the leak de- tector. Under this condition pressure can- not build up In the piping system. When a nozzle is opened a poppet In the look detec- tor moves to a position which restricts the flow to approximately 3 QPM. This Is the In- dication to the operator that a leak Is pres- ent. 2. LEAK BINSINQ POSITION • If there are no leaks, pressure rapidly builds In the system forcing the leak detec- tor to open to the full -flow position. In a Sys- tem with no leaks it takes only two seconds for a complete test. No further line testing takes place unfll the line pressure drops be- low 1 PSI, (Instantly), the diaphragm has moved the "poppet" to such a position as to almost stop the flow into the piping through the leak detector valve poppet. In this posi- tion, all the flow Must then travel around the metering pin which limits it to ap- proximately 3 OPH rate. If a simultane- ous loss from the system equals or ox• ceed$ this amount, the time 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 this position, the line pressure will drop, the diaphragm will respond, and the pop- pet will return to position 1 where ap- proximately 3 GPM will flow to the dis- pensers. Leaks smaller than 3 OPH will -35- 3. NON -LEAK POSITION be Indicated by the Leak Detector taking longer than two seconds to open com- pletely, If there is no leakage in the sys- tem, the small flow around the metering pin increases the line pressure to 10 PSI In approximately two seconds at which point the diaphr;Am will snap the poppet to position 3. This all takes place In less time than It takes the dealer 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. Iowa 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.