Operation notes of vertical single-stage fire pump

2020-11-24

The vertical single-stage fire pump is composed of a motor and a pump. The fire pump and the motor are coaxial. The pump structure includes the pump body, impeller, pump cover, and mechanical seal. The pump inlet and outlet are on the same horizontal axis, and the caliber specifications are the same, the installation and unloading is extremely convenient, and the area is small. The pump is equipped with a mounting base for easy installation and increase the stability of pump operation. The seal of vetical fire pump adopts mechanical seal, which has the characteristics of reliable seal and no leakage. The axial force of the pump is balanced by a balance ring set on the impeller.

Use and maintenance of vertical single-stage fire pump:
1. When installing the fire pump, the cable should be overhead and the power cord should not be too long. When launching the clean water fire pump, do not put press on the cable to avoid breaking the power cord. Do not sink the fire pump into the mud, otherwise it will cause poor heat dissipation of the motor and burn out the motor windings.
2. When purchasing a fire pump, pay attention to its model, flow and head. If the selected specifications are not appropriate, sufficient water output will not be obtained and the efficiency of the unit will not be exerted. In addition, the direction of rotation of the motor should also be clarified. Certain types of fire pumps can produce water during forward and reverse rotation, but the water output is small and the current is large during reverse rotation. The reverse rotation will damage the motor winding. In order to prevent electric shock accidents caused by electric leakage when the fire pump is working underwater, a leakage protection switch should be installed.
3. Check the motor regularly. If there are cracks in the lower cover, damage or failure of the rubber sealing ring, etc., it should be replaced or repaired in time to prevent water penetration into the machine.
4. Try to avoid starting at low pressure. The power supply voltage should not be 10% different from the rated voltage. If the voltage is too high, the motor will overheat and burn out the windings. If the voltage is too low, the motor speed will decrease. If cannot reach 70% of the rated speed, the centrifugal switch will close, which generate heat and even burn out windings and capacitors. Do not switch the motor frequently. This is because the electric pump will produce backflow when it stops. If it is turned on immediately, the load of the motor will start, resulting in excessive starting current and burning of the windings.
5. Do not allow the fire pump to run overloaded for a long time. Do not pump water with a large amount of sand in the clean water type. The dehydration operation time of the electric pump should not be too long to avoid the motor overheating and burning. During the operation of the unit, the operator must always observe whether the working voltage and current are within the values specified on the nameplate. If they do not meet the requirements, the motor should be stopped to find out the cause and troubleshoot (a fire control cabinet can be installed instead of manual inspection).
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