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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 NOTE. : If the piping has master/satellite dis- capable of measuring a 1 -second increment; pensers , the test apparatus must be connected • graduated cylinder for measuring leak rate; to the farthest satellite dispenser. • 5-gallon metal gas test can . S . Reestablish power to the pump . Open the shear 9. 1. 6 Preparation. valve and pressurize the line by activating the pump. Confirm that no leaks are present in the NOTE: : At some locations with master/satellite test apparatus or the connection to the shear fuel dispensing installations, the satellite may valve test port* not be protected by the MLLD . At sites with a 7 . Dispense product from the dispenser nozzle master/satellite fueling location, the test should into the test can to remove all air from the line. be performed at the most distant satellite dis- penser so the entire piping system is included. 8: Close the dispenser nozzle and allow the line to fully pressurize . Record this as the full pump Conduct the test at the dispenser that has the high- pressure. est elevation in the system. If there is no difference 9 . Shut off the pump, close the shear valve and in elevation between dispensers , conduct the test allow line pressure to decay until it stabilizes. using the dispenser farthest from the STP. Record this as the check valve holding pressure. If the line pressure does not stabilize, this may Remove from service all dispensers connected to prevent the MLLD from operating properly. the STP being tested. Verify that the STP relays are operating properly to ensure that the pump cycles 10. Bleed line pressure to zero by opening the on and off correctly. test apparatus leak orifice and allowing fluid to drain into a graduated cylinder. Record the 9. 1.6 MLLD Test Procedure. volume of fluid in the graduated cylinder as the line resiliency. Close the test apparatus leak NOTE: : This procedure describes calibration orifice, turn pump back on and observe pres- of the test apparatus leak orifice with the use sure gauge. Pressure should rise quickly and of a pressure regulator. If you prefer not to use pause for approximately 2 to 5 seconds before a pressure regulator, refer to the calibration building to full pump pressure. If the line pres- procedure described in Section 9 .2.6. sure reaches full pump pressure without paus- ing, this indicates that the leak detector did not 1. Visually inspect the vent tube. Verify that it "trip" (i.e. , move to the leak search position) . is connected at both ends to the appropriate If the leak detector did not move to the leak locations and that the vent tube is not broken, search position , repeat Step 8 . If the leak detec- kinked , twisted or leaking . If the vent tube is not for still does not move to the leak search posi- properly connected or is broken, kinked, twisted tion , the leak detector fails the test. or leaking , notify the appropriate person. 11.. Observe the line pressure when it pauses and 2 . Visually inspect the submersible pump area for record this as the metering pressure. leakage while it is operating. 12 . Measure the length of time it takes from 3 . Shut off power to the pump and perform lock- pausing at the metering pressure until full out/tagout procedures on the circuit breakers . pump pressure is achieved. Record this as the 4. Bleed line pressure to zero by activating the opening time . If the opening time is greater than dispenser and opening the nozzle, allowing fuel 5 seconds , this may indicate that air is trapped to drain into the test can. After all line pressure in the line, the piping has high resiliency or a has been bled off, hang up the nozzle and close leak smaller than the leak detector is capable of the shear valve . detecting may exist in the piping. 6. Connect the test apparatus to the shear valve test NOTE : Pay close attention to the pressure port at the appropriate dispenser. If there is no gauge while measuring the opening time, as elevation change, connect the test apparatus at this happens rather quickly. the farthest dispenser. pei . org