Well, submersible pumps are divided into vertical, horizontal, single-stage, multi-stage, single-suction, double-suction, self-suction, and other forms. Many people don't know enough about submersible well pumps or don't know it at all. Therefore, there will be many incorrect usages in the use of submersible well pumps.

Next, let's learn about some misunderstandings about the use of submersible well pump, which will help us to correctly choose and use submersible well pump in the future.

4 misunderstandings of using submersible well pump

✔️High lift water pump is used for low lift pumping

Many operators believe that the lower the pumping head, the smaller the motor load. Under this misunderstanding, when purchasing a water pump, the pump head is often selected to be very high.

In fact, for centrifugal pumps, when the model of the pump is determined, the power consumption is proportional to the actual flow of the pump. The flow of the pump will decrease with the increase of the lift, so the higher the lift, the smaller the flow and the smaller the power consumption. Conversely, the lower the lift, the greater the flow and the greater the power consumption.

Therefore, to prevent the motor from overloading, it is generally required that the actual pumping head of the pump should not be lower than 60% of the nominal head. Therefore, when the high head is used for pumping water with a low head, the motor is easily overloaded and heated, and the motor can be burned in severe cases.

For emergency use, a gate valve for adjusting the water output must be installed on the water outlet pipe (or block the small water outlet with wood or other objects) to reduce the flow and prevent the motor from overloading. Pay attention to the temperature rise of the motor. If the motor is found to be overheated, the flow rate of the water outlet should be reduced or shut down in time.

✔️When installing the water inlet pipe, the horizontal section is horizontal or upward.

Doing so will accumulate air in the water inlet pipe, reduce the vacuum degree of the water pipe and the water pump, reduce the water suction head of the water pump, and reduce the water output. The correct way is: the horizontal section should be slightly inclined towards the water source, should not be horizontal, and should not be raised upwards.

✔️There are many elbows on the water inlet pipeline

If there are many elbows used in the water inlet pipeline, it will increase the local water flow resistance. And the elbow should turn in the vertical direction, and it is not allowed to turn in the horizontal direction, so as not to collect air.

✔️The water inlet of the pump is directly connected to the elbow

This will make the water flow unevenly distributed through the elbow and into the impeller. When the diameter of the water inlet pipe is larger than the water inlet of the pump, an eccentric reducing pipe should be installed.

The flat part of the eccentric reducer should be installed on the top, and the inclined part should be installed on the bottom. Otherwise, the air will gather, the water output will be reduced or the water will not be pumped, and there will be impact sounds.

If the diameter of the water inlet pipe and the water inlet of the pump are equal, a straight pipe should be added between the water inlet of the pump and the elbow, and the length of the straight pipe should not be less than 2 to 3 times the diameter of the water pipe.

Conclusion

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