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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at LIST Facilities • stopwatch or other time -measurement device capable of measuring a 1 -second increment; • graduated cylinder for measuring leak rate; • 5 -gallon metal gas test can. 9.1.5 Preparation. NOTE:: At some locations with master/satellite fuel dispensing installations, the satellite may not be protected by the MLLD. At sites with a master/satellite fueling location, the test should be performed at the most distant satellite dis- penser so the entire piping system is included. Conduct the test at the dispenser that has the high- est elevation in the system. If there is no difference in elevation between dispensers, conduct the test using the dispenser farthest from the STP. Remove from service all dispensers connected to the STP being tested. Verify that the STP relays are operating properly to ensure that the pump cycles on and off correctly. 9.1.6 MLLD Test Procedure. NOTE:: This procedure describes calibration of the test apparatus leak orifice with the use of a pressure regulator. If you prefer not to use a pressure regulator, refer to the calibration procedure described in Section 9.2.6. 1. Visually inspect the vent tube. Verify that it is connected at both ends to the appropriate locations and that the vent tube is not broken, kinked, twisted or leaking. If the vent tube is not properly connected or is broken, kinked, twisted or leaking, notify the appropriate person. 2. Visually inspect the submersible pump area for leakage while it is operating. 3. Shut off power to the pump and perform lock- out/tagout procedures on the circuit breakers. 4. Bleed line pressure to zero by activating the dispenser and opening the nozzle, allowing fuel to drain into the test can. After all line pressure has been bled off, hang up the nozzle and close the shear valve. 5. Connect the test apparatus to the shear valve test port at the appropriate dispenser. If there is no elevation change, connect the test apparatus at the farthest dispenser. NOTE:: If the piping has master/satellite dis- pensers, the test apparatus must be connected to the farthest satellite dispenser. 6. Reestablish power to the pump. Open the shear valve and pressurize the line by activating the pump. Confirm that no leaks are present in the test apparatus or the connection to the shear valve test port. 7. Dispense product from the dispenser nozzle into the test can to remove all air from the line. 8: Close the dispenser nozzle and allow the line to fully pressurize. Record this as the full pump pressure. 9. Shut off the pump, close the shear valve and allow line pressure to decay until it stabilizes. Record this as the check valve holding pressure. If the line pressure does not stabilize, this may prevent the MLLD from operating properly. 10. Bleed line pressure to zero by opening the test apparatus leak orifice and allowing fluid to drain into a graduated cylinder. Record the volume of fluid in the graduated cylinder as the line resiliency. Close the test apparatus leak orifice, turn pump back on and observe pres- sure gauge. Pressure should rise quickly and pause for approximately 2 to 5 seconds before building to full pump pressure. If the line pres- sure reaches full pump pressure without paus- ing, this indicates that the leak detector did not "trip" (i.e., move to the leak search position). If the leak detector did not move to the leak search position, repeat Step 8. If the leak detec- tor still does not move to the leak search posi- tion, the leak detector fails the test. 11.. Observe the line pressure when it pauses and record this as the metering pressure. 12. Measure the length of time it takes from pausing at the metering pressure until full pump pressure is achieved. Record this as the opening time. If the opening time is greater than 5 seconds, this may indicate that air is trapped in the line, the piping has high resiliency or a leak smaller than the leak detector is capable of detecting may exist in the piping. NOTE: Pay close attention to the pressure gauge while measuring the opening time, as this happens rather quickly. pei.org 0