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�� PERM 200-17 S. AUTOMATIC LINE LEAK DETECTORS Automatic line leak detectors (ALLD) are used with submersible turbine pump (STP) systems to detect cata- strophic leaks in pressurized product piping systems. Automatic line lcak detectors may be either mechanical or electronic. ALLDs must be able to detect a leak in a product line that is equivalent to 3 gph at 10 psig. Therefore, the test appa- ratus that is utilized to conduct this test must accurately simulate a leak that is equivalent to 3 gph at 10 psig. This is accomplished by adjusting the size of the orifice in the test apparatus until the required flow rate is achieved. The calibration of the test apparatus leak orifice may be accomplished either with or without the use of a pressure regulator. The procedure for calibration with a pressure regulator is described in Section 9.1.6. The procedure for calibration without the use of a pressure regulator is described in Section 9.2.6. Either procedure may be used to accomplish calibration of the test apparatus leak orifice. NOTE: In order for a line leak detector to function properly, the STP must properly cycle on/off. Confirm that the STP properly cycles on/off as it would during normal fueling operations and visually inspect the STP electrical relay switches (also known as "contactors") to ensure that the contacts are in good condition. If the contacts show visible signs of excess arcing, damage or wear, notify the appropriate person to obtain authorization to replace the defective relays. If the STP does not properly cycle on/off, the line leak detector may not detect a leak from the pip- ing, and fails the test. NOTE: Piping configurations with multiple STPs and manifolded lines or those systems having master/satellite fuel dispensers must be installed properly for automatic line leak detectors to function correctly. Consult manu- facturer's literature regarding proper installa- tion and operation. NOTE: Testing of ALLDs involves creating a simulated leak from the piping system and activating the STP at specific times to pres- surize the system. These activities can be 0 pei.org hazardous if done improperly. To prevent unsafe conditions from developing, follow the safety precautions described in Section 3 and lockout/tagout procedures. FIGURE 9-1. The MLLD mounted on the submersible turbine pump will restrict flow when a leak is detected. 9.1 Mechanical Line Leak Detectors (MLLDs). 9.1.1 General. MLLDs are commonly installed at the STP and can detect a leak in product piping between the MLLD and the solenoid valve inside product dispensers. MLLDs restrict product flow if a leak is detected. Use this test procedure in conjunction with the MLLD manufacturer's installation and mainte- nance instructions. 9.1.2 Purpose. This test method is used to determine if an MLLD can detect a product line leak equivalent to 3 gph at 10 psig. 9.1.3 Description of Test. A test apparatus is typically connected to the test port of the shear valve inside a dispenser to simulate a leak in the product line equivalent to 3 gph at 10 psig. The performance of the line leak detector is observed to see if it can detect the simulated leak. 9.1.4 Test Equipment. Test equipment shall include: • test apparatus that includes a pressure gauge with a minimum range of 0-60 psig, a pressure regulator and an adjustable orifice that can simu- late a leak rate equivalent to 3 gph at 10 psig;