What Are The Methods To Improve The Service Life Of Submersible Pumps?

Sep 13, 2024

1, Confirm the correct rotation direction of the motor for the submersible pump
The rotation direction of the motor should be clarified. There are many types of submersible pumps that can produce water in both forward and reverse directions, but the water output is small and the current is high in reverse. If the reverse time is long, it will damage the motor winding.
2, Submersible pumps are prohibited from starting up due to abnormal power supply voltage
Due to the long length of low-voltage power supply lines, it is common for the terminal voltage of the lines to be too low. When the phase voltage is lower than 198 volts and the line voltage is lower than 342 volts, the speed of the submersible pump motor decreases. When it does not reach 70% of the rated speed, the centrifugal switch will close, causing the starting winding to be energized for a long time and generate heat or even burn out the winding and capacitor. On the contrary, excessive voltage can cause the motor to overheat and burn out the windings. Therefore, during the operation of the submersible pump, the operator must observe the power supply voltage value at all times. If it is below 10% of the rated voltage and above 10% of the rated voltage, the motor should be stopped to identify the cause and eliminate the fault.
3, Cable installation and insulation resistance requirements for submersible pumps
When installing a submersible pump, the cable should be overhead and the power line should not be too long. When diving or lifting the submersible pump, do not put force on the cable to avoid causing the power line to break. When the submersible pump is working, do not sink into the mud, otherwise it may cause poor heat dissipation of the motor and burn out the motor winding. During installation, the insulation resistance of the motor should not be less than 0.5 megohms.
4, Installation of leakage protector
Leakage protector, also known as life protector, can be understood from the three words "life protector". Because submersible pumps work underwater, they are prone to electrical leakage, which can cause energy loss and even lead to electric shock accidents. If a leakage protector is installed, as long as the leakage value of the submersible pump exceeds the operating current value of the leakage protector (generally not exceeding 30mA), the leakage protector will cut off the power supply of the submersible pump to ensure safety and avoid leakage and energy waste.
5, Avoid frequent switching

Do not frequently turn on and off the submersible pump, as it will generate backflow when the electric pump stops. If it is turned on immediately, it will cause the motor load to start, resulting in excessive starting current and burning out the winding. Due to the high current during startup, frequent startups can also burn out the windings of the submersible pump motor.

6, Do not let the submersible pump work under overload for a long time
To avoid long-term overload operation of submersible electric pumps, do not pump water with high sediment content and observe whether the current value is within the specified value on the nameplate at any time. If excessive current is found, stop the machine for inspection. In addition, the dehydration operation time of the electric pump should not be too long to avoid overheating and burning out the motor.
7, When repairing a water pump, do not disassemble it yourself if it malfunctions. Because when disassembling by oneself, one does not know where the fault lies and blindly disassembles it; Secondly, the lack of tools often damages the originally intact components. The solution is to go to experienced and large-scale repair points for maintenance, and promptly replace "over aged" parts and certain vulnerable parts. Under normal circumstances, the water pump should be repaired every six months to prevent working with "diseases".
8, Before starting the submersible pump, some necessary checks should be carried out: whether the rotation of the pump shaft is normal and whether there is any jamming phenomenon; Is the position of the impeller normal; Check for any cracks, scratches, or breaks in the cables and cable plugs. During operation, attention should be paid to observing the changes in voltage, generally controlled within ± 5% of the rated voltage. In addition, the position of the water pump in the water is very important. It should be selected as much as possible in a place with abundant water, no silt, and good water quality. It should be suspended vertically in the water and not allowed to be placed horizontally to avoid getting stuck in the mud or being blocked by suspended solids at the inlet of the water pump, which may result in a sharp decrease in water output or even inability to pump water.

9, For self-priming pumps, they should be placed in well ventilated areas as much as possible to facilitate rapid heat dissipation and reduce motor temperature. Otherwise, prolonged operation can easily burn out the motor. If a farmer uses a self-priming pump and fails to remove the plastic film covering the motor, the motor overheats and burns out the coil. In addition, before starting, it is necessary to check the water storage in the pump body, otherwise it will not only affect the self-priming performance, but also easily burn the shaft seal components. Under normal circumstances, the water pump should release water within 3-5 minutes after starting, otherwise it should be stopped immediately for inspection.
10, During the non use period, the water pump should be promptly lifted away from the water source and the accumulated water in the pump should be drained, especially in the cold winter. Then place it in a dry place. Conditional users can also apply butter to the key parts of the water pump and add lubricating oil to the bearings to prevent rusting of the components. In addition, the non use period of a water pump is not necessarily the longer the better. If not used for a long time, not only are parts prone to rusting, but the service life of the water pump will also be reduced.

Pay attention to daily maintenance of submersible sewage pumps: Regularly check the motor. If cracks are found on the lower cover, damaged or ineffective rubber sealing rings, etc., they should be replaced or repaired in a timely manner to avoid water infiltration into the submersible pump. Pay attention to the use of submersible pump protectors and some daily protection measures, which can better extend the service life of submersible pumps.