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Fire pump stations are used to transport clean water free of solid particles and liquids with physical and chemical properties similar to water. They are primarily employed for pressurizing water in fire protection systems, but can also be used in industrial and municipal water supply and drainage systems, for pressurizing water in high-rise buildings, for transporting water over long distances, for heating systems, bathrooms, boiler hot and cold water circulation, as well as for pressurizing water in air conditioning and refrigeration systems and for supporting various equipment. Structural description of the fire pump: 1. This pump is of vertical, multi-stage segmented design; the inlet and outlet flanges are aligned on the same line. The impeller uses hydraulic balancing to counteract axial forces, and there is a guide bearing at the lower end. The shaft is connected to the motor shaft via a casing coupling, and the outer cylinder is made of stainless steel. 2. The shaft seal uses a mechanical seal. 3. Driven by a motor, the pump rotates in a clockwise direction when viewed from the side of the motor. 4. An exhaust valve is provided at the outlet to ensure that all gas inside the pump can be completely expelled. 5. The impeller can be made of bronze to prevent rust formation between the impeller and the guide vanes during prolonged shutdowns. Functions of the fire pump electrical control cabinet: 1. Inspection function: It has capabilities for regular automatic inspections as well as manual inspections. Methods such as variable-frequency operation can be employed to reduce the impact on the power grid and pipeline network when the water pump starts up. 2. Protection functions The control cabinet should have overload protection, short-circuit protection, overvoltage protection, phase loss protection, undervoltage protection, and overheating protection functions. When the above conditions occur, the fault light on the electrical control cabinet of the fire pump set stays on, and a fault signal is generated. 3. Feedback function The control cabinet should have the capability to send signals such as pump start, pump stop, pump failure, and manual/automatic mode back to the alarm host in the fire control room. 4. Pump start/stop function The control cabinet is equipped with buttons for manually starting and stopping each water pump, as well as input terminals for remotely controlling the startup of the pumps. Starting, operating, and stopping should proceed normally, and the indicator lights and gauges should display properly. 5. Primary/backup pump switching function: When the primary pump fails, the backup pump is automatically activated after a delay. 6. Dual power supply switching function The control cabinet should have an automatic dual power supply switching function. The power supply to be used should be a fire protection power supply. The dual-power switching device can be installed near the electrical control cabinet of the fire pump set, or it can also be placed inside that same electrical control cabinet. 7. Mechanical emergency start function The control cabinet shall have a mechanical emergency start function. In the event of a fault in the control circuits inside the control cabinet, personnel with administrative privileges can start the water pump in an emergency. 8. Manual/automatic switch function: In automatic mode, the water pump can be started automatically or remotely by hand, while the multi-wire control panel allows for remote shutdown of the water pump. In manual mode, the water pump can be started and stopped using the start/stop buttons on the control cabinet.