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VENT CLOSING SCREW FUNCTIONAL ELEMENT should drop to 8 to 14 psi and hold on Red Jacket pumps SEAL manuf actured previous to January,1984;dropto 16to22 psi and hold on Red Jacket pumps manufactured previ- PRESSURE RELIEF ous to May, 1985; dropto 14 to 20 psi and hold on Red VALVE Y Jacket pumps manufactured there after. Fordiaphragm leak detectors,if the pressure should E.cessueDessue drop immediately to zero after turning the pump off, it is an indication that either of the subject areas are not T.0- L— functioning properly. For Piston LLD,the pressure would CHECK VALVE drop to 3-5 PSI rapidly after turning off the pump for the same indication. All seals ("0" rings, relief valve,check valve, etc.) should be checked and replaced, as indi- cated. (Figure 2) Please note the following procedure and information FIGURE 2A for Red Jacket pumps: a) To test the check valve, turn the pump back on and screw the `went closing screw" (Figure 2A) in the top of the Red Jacket pump head completely down against the j check valve and tighten. Turnthe pumpoff andwatch the pressure drop. If the pressure then drops immediately to zero (for the Piston LLD, rapidly to 3 - 5 PSI), without DISCHARGE O-RING BELOW LEAK touching anything, pp turn the um back on and watch the DETECTOR PORT pressure gauge. If the submersible pump check valve is leaking, pressure will increase on the gauge. If this happens, the check valve should be replaced. Disable submersible pump before beginning to replace the check valve. Failure to do so may cause _ accidental discharge of pressur- ized gasoline which can cause se- vere personal injury,death or sub- stantial property damage if ignored. After replacing the check valve,if indicated,repeat the above test to assure that the check valve is now seating properly. Turn the vent closing screw back up to the into the line. Then the pressure will drop to zero and the original position, and restart the pump to pressurize the Piston LLD will drop into the trip position. discharge piping. Again,observe the pressure gauge and Except for a leaky functional element seal, which is wait until full line pressure is obtained. Turn off the easily visible, these situations would not actually create submersible pump,and the line pressure should drop to 8 any problems, other than accelerated wear. The leak to 14 psi on pumps manufactured prior to January, 1984; detector would be required to make a test every time the 16 to 22 psi on pumps manufactured prior to May, 1985; submersible pump was turned on. Since the leak detec- 14 to 20 psi and hold on pumps manufactured there after. tor only senses leaks downstream of itself, (between the b) An"O" ring is located below the leak detector port on leak detector and dispenser)when the submersible pump all Red Jacket pumps manufactured since 1963 (other is turned on, it will take the prescribed amount of time to than Big-Fio models), which seals to the milled surface open,that is approximately 2 seconds if there is no leak over that discharge port(Figure 26). Failure of this seal downstream. It is usually a positive indication that there can possibly be the result of damage to the milled surface is a leak in the system upstream of the leak detector if the caused by resting the pump-motor end here while in the system pressure goes to zero within several minutes process of pulling the extractable portion of the pump,or after every use and yet the leak detector opens rapidly in if the sealing area becomes dirty when the extractable the proper amount of time each time the pump is turned portion of the pump is not in place. This will cause a back on. downstream leak. While no product is lost,other charac- The procedure for testing these areas is as follows: teristics are the same as a leak in the discharge line. To The same test set-up and installation as shown in Figure re-establish this seal, clean the area thoroughly. Re- 3 is required for this test. After the test equipment has place the square ring if dirty or damaged and cover the been installed and the pump enabled (Observe warn- milled surface with an adequate layer of petroleum resis- Ings on figure 3),the pump should be started and a few tant, non-setting thread sealant previous to replacing the gallons of product dispensed to remove any air which extractable portion of the pump. may have entered the system while installing the test fixture. The pump should then be restarted to pressurize 3) Is thermal contraction occurring? the system. After the leak detector has completed its test Thermal contraction is perhaps the most ignored and cycle,full line pressure (approximately 26 psi)will regis- least understood of conditions which can cause a loss of ter on the gauge. Turn off the pump and the pressure pressure in an underground piping system. Thermal -2-