What is the difference between multi-stage and single-stage centrifugal pumps

Before understanding the difference between multi-stage centrifugal pumps and single-stage centrifugal pumps we must first find out what is a multi-stage centrifugal pump and what is a single-stage centrifugal pump. Multi-stage centrifugal pump is a collection of two or more centrifugal pumps with the same function, fluid passage structure, the performance of the level of the media pressure relief port and the second stage of the inlet, the second stage of the media pressure relief port and the third stage of the inlet, so the tandem mechanism formed a multi-stage centrifugal pump. Commonly speaking, multi-stage centrifugal pumps are two or more impellers in series, while single-stage centrifugal pumps have only one impeller, connected to the motor through a long flexible coupling, the direction of rotation of the pump, from the drive end, for clockwise rotation.

First of all the single-stage centrifugal pump is definitely the basis of the multi-stage centrifugal pump, both are centrifugal pumps, the same size impeller in series, installed in the same pump, the formation of multi-stage centrifugal pump.

1, so the obvious difference between the two lies in the impeller, single-stage centrifugal pump only one impeller, multistage centrifugal pump impeller number in more than 2 stages, single-stage centrifugal pump refers to only one impeller pump, head only 125 meters;

2, multi-stage centrifugal pump is a pump with two or more impellers, the head can exceed 125 meters; multi-stage pump in the single-stage pump head need to be equipped with two-stage motor, you can increase the number of impellers to match the four-stage motor, which can improve the pump life and reduce the noise of the unit, but multi-stage pump maintenance is a little more difficult compared to single-stage pump.

3, the pressure is superimposed on the impeller of each stage, single-stage and multi-stage centrifugal pump impeller is different, the formation of the two pressure size is different. Single-stage centrifugal pump pressure is low flow, multi-stage centrifugal pump pressure is large flow is small.

4, multi-stage centrifugal pump head high, axial force than single-stage pump, single-stage centrifugal pump head than multi-stage centrifugal pump low, but the flow of large pressure is low.

5、When the actual head of the pump is less than 125 meters, the area of the pump room, the price of the pump (multi-stage centrifugal pump is generally higher than the price of single-stage centrifugal pump), and other factors to consider the choice of single-stage centrifugal pump or multi-stage centrifugal pump.