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WARNING This equipment is usually mounted underground. Personnel working on this equipment are in danger from moving vehicles entering the work area due to the service personnel's reduced visibility. ALWAYS secure the ork area by parking the service truck, and using all other means available, so as to prevent vehicles from wri ving over or near the work area. CAUTION Thermal expansion can cause pressure to build up in the product lines. FE Petro, Inc. STPIIST's have a built- in relief valve to release this excess line pressure back to the tank. Do not use an additional check valve unless it has the capability to relieve excess pressure back to the tank, as this could result in a buildup of abnormal pressure in the lines, causing a pipe or joint in the supply line piping to burst, and release of fuel into the environment. IZL CAUTION This leak detector is designed for use in certain applications and in compliance with industry standards and practices. Use in different applications or failure to follow industry standards and practices may cause the product to malfunction or fail. The following product information and use instructions are particularly important. ! CAUTION STP-MLD units are designed to detect leaks from where the STP-MLD is installed and downstream of it. A leak in the piping upstream of the STP-MLD, which includes the pump, would require a second means of monitoring to be detected. Thus, install the STP-MLD as close to the pump as possible to minimize upstream piping. WARNING au not attempt to disassemble the leak detector. Some parts are under strong spring tension and could se severe injury if not handled properly. Installer: This instruction booklet MUST be left with the owner of the service station at which the equipment is being installed. Station Owner: Retain these instructions for future use and provide them to persons servicing or removing this equipment. STP-MLD INTRODUCTION STP-MLD units are piston-operated mechanical leak detectors intended for installation only in a petroleum pumping system operating with 20 to 50 PSI pump pressure with less than 12 feet of static fluid head. They automatically indicate pipeline faults, which leak 3 GPH (gallons per hour) or more at 10 PSI. These leaks are indicated by restricting system delivery to 3 GPM (gallons per minute) or less at pump pressure of up to 30 PSi in compliance with U.S. EPA requirements 280.41(b) & 280.44(a) for automatic leak detection in pressurized piping. After installation, the user of the leak detector must monitor system delivery levels to ensure that any restricted delivery of fuel, signaling a leak in the pipeline, is dealt with promptly. The STP-MLD units test the delivery pipeline system up to the solenoid valve in the dispenser for leaks whenever the static system pressure has fallen to one PSI or less, and within 3 to 4 seconds (depending on model) allows full flow if the system has no leaks. A leak smaller than the required 3 GPH detection level, any air or vapor trapped in the system, or systems with pressure below 26 PSI, will lengthen the time before the leak detector allows full flow. The leeak detector is not designed to detect leaks from the underground storage tank or the submersible pump. STP-MLD units are designed for use with FE Petro STPiIST model submersible pumps. They can also be used with Red Jacket P33R1, P75S1, P150S1, AGP33R1, AGP75S1, and AGP150S1, or with Tokheim models 585A-34 and 3