Submersible fire pump selection and use points


 Submersible pumps play an important role in production and life, and the following points should be paid attention to in use.
1. When purchasing a submersible pump, pay attention to its model, flow rate and head. If the selected specifications are not appropriate, it will not be able to obtain sufficient water output, and the efficiency of the unit cannot be exerted. In addition, the direction of rotation of the motor should also be clarified. Some types of submersible pumps can discharge water when they are forward and reverse, but the water output is small and the current is large when they are reversed. The reverse will damage the motor windings. In order to prevent electric shock accidents caused by electric leakage when the submersible pump is working underwater, a leakage protection switch should be installed.
2. When installing a small submersible pump, the cables should be overhead and the power cord should not be too long. Do not put force on the cable when the unit is launched into the water, so as not to cause the power cord to break. Do not sink the submersible pump into the mud, otherwise it will cause poor heat dissipation and burn out the motor windings.
3. Try to avoid starting the machine at low voltage. The difference between the power supply voltage and the rated voltage should not be 10°C. If the voltage is too high, the motor will overheat and the winding will be burned. When energized, it will generate heat and even burn out the windings and capacitors. Do not switch the motor on and off frequently. This is because backflow will occur when the electric pump stops. If it is turned on immediately, the motor load will start, resulting in excessive starting current and burning of the windings.
4. Do not allow the water pump to run on overload for a long time, and do not pump water with high sand content. The dehydration operation time of the electric pump should not be too long, so as not to overheat the motor and burn it. When the unit is in operation, the operator must observe at any time whether the working voltage and current are within the values specified on the nameplate. If not, the motor should be stopped to find out the cause and eliminate the fault.
5. Check the motor more often. If you find cracks in the lower cover, damaged or invalid rubber sealing ring, etc., you should replace or repair it in time to prevent water from penetrating into the machine.
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