The main difference between single-stage centrifugal pumps and multi-stage centrifugal pumps is their number of impellers, which is referred to as the number of stages in the industrial centrifugal pump industry terminology. As the name suggests, a single-stage pump only has one impeller, while a multi-stage pump has two or more impellers.

A multi-stage centrifugal pump operates by feeding one impeller into the next impeller. As the liquid moves from one impeller to the next, the pressure increases while maintaining the flow rate. The number of impellers required depends on the discharge pressure requirements. The multiple impellers of a multi-stage pump are installed on the same shaft and rotate, essentially similar to individual pumps. A multi-stage centrifugal pump can be considered as the sum of a single stage pump.

Due to the fact that multi-stage pumps rely on multiple impellers to distribute pump pressure and build loads, they can generate greater power and higher pressure with smaller motors, making them more energy-efficient.

Which is the Best Choice? 

The choice of which type of water pump is better mainly depends on on-site operating data and actual needs. Choose a single-stage pump or a multi-stage pump based on the height of the head. If single stage and multi-stage pumps can also be used, single stage pumps are preferred. Compared with multi-stage pumps with complex structures, high maintenance costs, and difficult installation, the advantages of a single pump are very obvious. The single pump has a simple structure, small volume, stable operation, and is easy to maintain.