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PERM 200` 17 �_ hazardous if done improperly. To prevent S. AUTOMATIC LINE LEAK unsafe conditions from developing, follow DETECTORS the safety precautions described in Section 3 and lockout/tagout procedures . 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 leak detectors may be either mechanical i or electronic. r. 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- 10 ratus that is utilized to conduct this test must accurately l r, MLLD 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 'tea 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 FIGURE 9-1. The MLLD mounted on the submersible is described in Section 9 .2 . 6. Either procedure may be turbine pump will restrict flow when a leak is detected. used to accomplish calibration of the test apparatus leak orifice . 9.1 Mechanical Line Leak Detectors ( MLI.p NOTE: In order for a line leak detector to 9 .1. 1 General . MLLDs are commonly installed function properly, the STP must properly at the STP and can detect a leak in product piping cycle on/off. Confirm that the STP properly ng between the MLLD and the solenoid valve inside cycles on/off as it would during normal fueling operations and visually inspect the product dispensers. IM restrict product flow if a leak is detected . STP electrical relay switches (also known as "contactors") to ensure that the contacts are in Use this test procedure in conjunction with the good condition . If the contacts show visible MLLD manufacturer ' s installation and mainte- signs of excess arcing, damage or wear, notify nance instructions. the appropriate person to obtain authorization to replace the defective relays . If the STP 9 . 1.2 Purpose. This test method is used to does not properly cycle on/off, the line leak determine if an MLLD can detect a product line detector may not detect a leak from the pip- leak equivalent to 3 gph at 10 psig. ing, and fails the test. 9 .1.3 Description of Test. A test apparatus is typically connected to the test port of the shear NOTE: Piping configurations with multiple valve inside a dispenser to simulate a leak in the STPs and manifolded lines or those systems product line equivalent to 3 gph at 10 psig. The having master/satellite fuel dispensers must performance of the line Ieak detector is observed be installed properly for automatic line leak to see if it can detect the simulated leak, detectors to function correctly. Consult manu. facturer ' s literature regarding Pro er installa- 9 .1.4 Test Equipment. Test equipment shall tion and operation. include . test apparatus that includes a pressure gauge NOTE: Testing of ALLDs involves creating with a minimum range of 0-60 psig, a pressure a simulated leak from the piping system and regulator and an adjustable orifice that can simu- activating the STP at specific times to pres- late a leak rate equivalent to 3 gph at 10 psig ; surize the system. These activities can be pei . org I