Pumps Wiki Knowledge

Use and maintenance of submersible pumps for wells

To ensure the normal operation of submersible pumps for wells, the following requirements must be followed.
Before using the submersible pump for well use, a megohmmeter must be used to check the insulation resistance of the motor, and the minimum value should not be less than 50M Ω.
The water immersion motor should open the filling plug, fill it with clean water, and then tighten the plug. It is not allowed to unscrew the filling plug and directly enter the well.
Before use, check if the cable is broken or broken. If there is any damage, it should be replaced in a timely manner to prevent leakage.
Before launching the submersible pump for well use, clean water should be injected into the pump, and then it should be idle for 1-2 minutes and started twice to check whether the start and idle are normal, and whether the steering meets the requirements. If the steering direction is opposite, simply switch any two phase wiring.
Check if there are cracks in the lifting pipe and if the connection is secure.
When lowering and lifting submersible pumps used in wells, it is not allowed to forcefully pull cables to avoid cable damage or disconnection at joints, which may cause unexpected accidents. Iron wires or pallets should be used for lowering and lifting.
The power supply voltage should be controlled within the range of ± 5% of the rated voltage, so that the motor can operate normally. If the voltage is too low or too high, the motor cannot continue to be used to avoid damage during long-term operation under overvoltage or undervoltage.
When diving into the water, the submersible pump used in the well should be vertically suspended and not tilted. The optimal depth of entry is 5 meters below the dynamic water level.
Submersible pumps used in wells shall not transport water or mud with high sand content.
The actual head of the submersible pump for well use should be within 0.8-1.1 times the rated head to improve unit efficiency, save energy, and avoid motor overload.
The motor wiring must be grounded to prevent the motor from burning out during phase loss operation.
The cable must be regularly inspected for cracks, scratches, and other conditions, and if there are any, they must be replaced or repaired in a timely manner.
If oil leakage occurs in the oil immersed motor, it should be promptly repaired by the manufacturer or maintenance point, and the sealing components should be replaced.
Water immersed motors should be regularly cleaned of sand particles in the motor cavity and replaced with clean water in the motor cavity.
After six months of operation, the submersible pump for well use should be repaired and inspected, and damaged parts should be replaced.
After using the submersible pump for well use, the water immersed motor should be drained of clean water inside the motor, cleaned, oiled for rust prevention, and stored vertically in a dry place.


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