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What is the Misunderstanding in the Use of Centrifugal Water Pump?

Feb. 22, 2021

As a Centrifugal Water Pump Manufacturer, share with you.

Misunderstandings in the use of centrifugal pumps

High-lift pump for low-lift pumping

Many operators believe that the lower the pumping head, the smaller the motor load. Under the misleading of this kind of misunderstanding, when purchasing a water pump, the head of the water pump is often selected very high. In fact, for centrifugal water pumps, when the pump model is determined.

Centrifugal Water Pump

Centrifugal Water Pump

The actual flow of the pump is proportional. The flow rate of the water pump will decrease with the increase of the head, so the higher the head, the smaller the flow and the lower the power consumption. Conversely, the lower the head, the greater the flow and the greater the power consumption. Therefore, in order to prevent the motor from overloading, it is generally required that the actual pumping head of the pump should not be less than 60% of the calibrated head. Therefore, when the high head is used for pumping water with a low head, the motor is easily overloaded and heats up, and it can burn the motor in severe cases. In case of emergency use, a gate valve for adjusting the amount of water must be installed on the outlet pipe (or block the small outlet with wood, etc.) to reduce the flow and prevent the motor from overloading. Pay attention to the temperature rise of the motor. If the motor is overheated, turn off the water outlet flow or shut down in time. This is also easy to misunderstand. Some operators think that blocking the water outlet and forcibly reducing the flow will increase the motor load. In fact, the opposite is true. The outlet pipe of a regular high-power centrifugal pump drainage and irrigation unit is equipped with a gate valve. In order to reduce the motor load when the unit starts, the gate valve should be closed first and then gradually opened after the motor starts.

Large diameter water pump with a small water pipe for pumping

Many operators think that this can increase the actual head, but the actual head of the water pump = total head ~ loss head. When the pump model is determined, the total head is fixed; the loss head mainly comes from the pipeline resistance, the smaller the pipe diameter is, the greater the resistance is, and the greater the loss head is. Therefore, after the pipe diameter is reduced, the actual head of the pump cannot be increased. , On the contrary, it will decrease, resulting in a decrease in the efficiency of the water pump.

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