The submersible well pumps and the motor are connected by a coupling. The unit is slender and can be put into the well to absorb groundwater. The submersible well pumps, because the pump head and the motor are connected, work together underwater. The efficiency of the shaft deep well pump unit has been improved, and the material of the whole machine has been greatly reduced. It is recognized as the simplest, most economical and most effective device for extracting groundwater.

Precautions before using submersible well pump

✔️Check the liquid in the motor cavity

Check whether the motor cavity of the well submersible pump is filled with liquid, clean water or insulating oil as required. If it is not filled, it must be filled according to the instructions.

✔️Insulation resistance inspection of electric pump

Before the outgoing cable of the electric pump is connected with the belt cable, a 500-volt megohmmeter shall be used to measure the insulation resistance of the motor winding to the casing, and the value shall not be lower than the requirement. When the insulation resistance value is lower than the normal requirements, it is necessary to check the wiring and eliminate the low insulation resistance before it can be used in water.

✔️Submersible pump installation size inspection

When the submersible pump and submersible motor are assembled, the matching size of the motor and the water pump must be checked, the amount of movement of the electric pump must be strictly controlled, and the electric rotating part can be rotated at the coupling.

✔️Cable outer joint and sealing treatment

When the submersible pump goes downhole, the outgoing cable and the attached cable must be sealed with the outer joint of the cable, and the core wires of each phase must not be twisted with each other.

✔️The conditions of use of submersible pumps

The electric pump is completely submerged in the water, the depth should not be more than 70 meters, the temperature should not be higher than 20 °C, the sand content of the water should not exceed 0.01%, and the pH value should be 6.5~8.5.

✔️The submersible electric well pumps must be used together with the protection switch

The electric pump dives into the water to work, and its operation is not easy to observe. When the electric pump fails, if the switch is not used for timely and effective protection, the winding of the electric pump will be damaged soon, so the protection device is required to check the operation of the electric pump. Protect in time when the specified current is 1.05 times.

✔️Ensure the power quality of the submersible pump

The submersible electric well pump usually uses a relatively high lift and a long lead-out cable, so the pressure drop on the lead-out cable is relatively large. When using the submersible electric pump, it is necessary to ensure that the terminal voltage of the three-phase winding of the electric pump is between 342 and 418 volts. The electric pump can work reliably, and the voltage is too high or too low, which will affect the use, and the winding will be damaged in severe cases.

✔️The head of the submersible pump must be properly selected

The actual head needs to be consistent with the rated head of the electric pump to ensure the reliable operation of the electric pump and give full play to the efficiency of the electric pump. The actual head generally does not exceed 20% of the rated head. Otherwise, the first-stage impeller should be removed or the valve should be properly closed.

✔️Protect the cable in good condition

When installing or dismantling the water pump, do not drag the cable to prevent the cable joint from being damaged, causing accidents such as water leakage and electricity leakage. The cable needs a professional cable clamp to fix the cable on the water outlet pipe every 5-10 meters.

✔️The diving depth of the submersible electric well pumps should be appropriate

For the submersible electric well pumps, the submersible depth of the electric pump is the distance from the dynamic water level of the well water to the submersible electric pump. Too shallow air will suck in air, affecting the water output and service life. It will also be unbearable, causing the insulation resistance to drop, so it is most suitable to keep the diving depth at 2~6 meters.

Last few words

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