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STP-MLD Line Leak Testing Note: To properly check a line leak detector the following is required: a graduated cylinder (usually graduated in milliliters) of approximately 300 ml volume, a test fixture which allows a leak of 3 GPH at 10 PSI (see Figure 1), and a stop watch or a watch with a seconds hand. 16. Turn the pump off at the load center, relieve the line pressure, and then remove the pipe plug in the shear-valve. Make adequate provision to trap any liquid that escapes to prevent environmental contamination. Install test fixture (pressure gage, leak valve and pressure valve) into the dispenser shear-valve port, see Figure 1. The test fixture will be used to introduce a 3 GPH leak @ 10 PSI. 17. With the leak valve closed, turn on the submersible pump at the load center and at the dispenser and look for leaks at the port of the shear-valve. Note: If there are any leaks, immediately shut the pump off at both the dispenser and at the load center, tag and lock out the breaker, and eliminate the leaks. Repeat step 17 to verify. 18. Turn the pump off at the dispenser and open both valves, draining the fluid into a suitable container, and observe the pressure dropping to zero. Continue draining until there is no more product coming out. Close the leak valve, turn the pump on at the dispenser and observe the pressure gauge. The pressure should increase quickly up to 20 to 26 PSI, and hesitate for 1-4 seconds or longer if there is air or vapor trapped in the system, and then increase to full Figure 1 pump pressure. 19. With the submersible pump on, adjust the leak valve and pressure valve simultaneously until 10 PSI and 3 gph or less are attained, while draining the fluid into a suitable container. To verify the leak, catch the output product into a graduated cylinder for 60 seconds (or the equivalent product measurement for a shorter time period, i.e., 94 milliliters at 30 seconds = 188 milliliters per 60 seconds). Turn off the pump and calculate the leak rate detected as follows: Leak Rate GPH = { (milliliters of fuel caught/ 60 seconds) x .95 } Note: The detected leak rate must be set to 3 GPH or less per EPA standards. If the leak rate needs to be adjusted, repeat step 19 while increasing or decreasing the leak rate and maintaining 10 PSI at the pressure gage. 20. Once the leak rate is established, do NOT adjust the leak valve. Open the pressure valve all the way and allow the line pressure to drop to zero. Leave the pressure valve open all the way. Continue to drain until there is no more product draining. Turn the submersible pump on at the dispenser and direct the fluid into a suitable container while observing the pressure gauge, which should not increase above 26 PSI. Turn the submersible pump off and wait at least one minute. Turn the submersible pump back on at the dispenser and observe that the pressure does not increase above 26 PSI. This step verifies the leak detector has detected a leak equivalent to approximately 3 GPH @ 10 PSI as required by the EPA. 21. Close the leak valve and observe the pressure increase to full pump pressure. Turn the submersible pump off and drain the pressure back to zero. 22. Turn the pump off at the load center, and remove the test fixture, and replace the pipe plug after applying UL- classified, non-hardening, non-toxic pipe thread sealant. 6