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(V'1� PEIIRP1200-17 13.With the STP on and full pump pressure If the leak detector does not reset (trip) when the indicated, slowly open the test apparatus leak line pressure is bled off to zero, the MLLD faits orifice and direct the fuel flow into a test can. the test. 14.Ensure that fluid flow is passing through the If the STP does not properly cycle on/off under nor- pressure regulator to the leak orifice. With the mal fuel system operating conditions, the MLLD pressure regulator, adjust the line pressure to fails the test. 10 psig. Direct the fluid flow into a graduated cylinder and time for 60 seconds. Adjust the NOTE: If the leak detector initially fails, the size of the test apparatus leak orifice until the test procedure should be repeated to confirm desired leak rate of 189 ml/min is achieved the initial result. while maintaining a line pressure of 10 psig.It may be necessary to readjust the pressure regu- 9,1.8 Restore System to Operational Condi- lator and/or the test apparatus leak orifice sev- tion. Upon completion of the test: eral times in order to correctly set the leak rate at 189 ml/min at a line pressure of 10 psig. To Shut off power to the STP and perform lockout/ expedite calibration, make coarse adjustments tagout procedures on the circuit breakers.Allow by measuring the volume of fluid that corre- line pressure to bleed off to zero and close the sponds to 15 seconds(47 ml).The final calibra- shear valve. tion of the test apparatus leak orifice must be Remove the test apparatus from the shear valve conducted by measuring a fluid volume of 189 body and properly reinstall the plug into the ml over the full 60-second time frame. shear valve test port. 15.Tum the pump off and allow the line pressure • Reestablish power to the STP, tum dispenser to bleed off completely (0 psig) through the on and confirm that no leaks are present in the test apparatus leak orifice. This should cause system. the leak detector to "trip" (move into the leak sensing position). Do not change the size of Dispense product into the test can to remove any the test apparatus leak orifice after it has been air from the line and confirm that full product properly calibrated in Step 14. flow is achieved. I.S.Redirect fluid flow to bypass the pressure 9.2 Electronic Line Leak Detectors(ELLDs). ELLDs regulator, and tum the pump on to allow the are commonly installed at the STP and can detect a leak simulated leak to occur through the calibrated in product piping between the ELLD and the solenoid test apparatus leak orifice. valve inside product dispensers. ELLDs trigger an alarm 17.Observe that the line pressure rises to the and may shut down the STP if a leak is detected. metering pressure determined in Step 11 and 9.2.1 General. Use this test procedure in con- remains there indefinitely with the pump junction with the ELLD manufacturer's installation running and the simulated leak occurring and maintenance instructions. through the calibrated test apparatus leak orifice.The metering pressure must remain for 9.2.2 Purpose. This test method is used to a minimum of 60 seconds. If the line pressure determine if an ELLD can detect a product line rises to the full pump pressure at any time leak equivalent to 3 gph at 10 psig. during the test, this indicates that the leak detector has fully opened and fails the test. 9.2.3 Description of Test. A test apparatus is typically connected to the test port on the shear 9.1.7 Pass/Fall Criteria. If line pressure does valve inside a dispenser to simulate a leak in the not increase above the metering pressure for the product line equivalent to 3 gph at 10 psig. The duration of the test with the simulated leak occur- performance of the line leak detector is observed ring, then the MLLD passes the test. to see if it detects the simulated leak. If the line pressure increases to full pump pressure 9.2.4 Test Equipment. Test equipment shall while the simulated leak is occurring, the MLLD include: fails the test. a test apparatus that includes a pressure gauge pei.org