Multistage centrifugal pump pipe section matching

Update:30-11-2018
Summary:

Some multi-stage centrifugal pump users think that this […]

Some multi-stage centrifugal pump users think that this can improve the practice of the lift, in fact, the pump's practice head = total lift ~ lost lift. When the pump type is determined, the total lift is inevitable; the lost lift is mainly from the pipeline resistance. The smaller the diameter, the greater the resistance, and the larger the lost lift. Therefore, after the diameter is reduced, the actual lift of the pump can not be added. On the contrary, it will drop, causing the pump power to drop.

In the same way, when the small-diameter water pump is pumped with a large water pipe, it will not lower the practice head of the water pump, but will reduce the lost lift due to the reduction of the resistance of the pipeline, and the practice head will be improved. It is also natural to think that when the small-diameter water pump is pumped with a large water pipe, the motor load will be greatly increased.

They think that the water in the water outlet pipe will have a large pressure on the pump impeller after the pipe diameter is increased, and thus the motor load will be greatly increased. As everyone knows, the size of the liquid pressure is only related to the bump of the lift, and has nothing to do with the size of the cross-sectional area of the water pipe. Only the head must be set, the impeller scale of the pump is constant, no matter how large the pipe diameter, the pressure acting on the impeller is inevitable. Only when the pipe diameter is increased, the water flow resistance will be reduced, and the flow rate will be added, and the power consumption will be appropriately added. However, it is only necessary to add the pump in the extra lift range, no matter how the pipe is added, it can work normally, and it can also reduce the pipeline loss and improve the pump power.

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