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1. Single stage centrifugal pump refers to a pump with only one impeller and a high head of only 125 meters;

2. A multi-stage high-pressure centrifugal pump refers to a pump with two or more impellers, with a high lift of over 125 meters; When a multi-stage pump requires a two-stage motor for a single stage pump head, a four stage motor can be used by increasing the number of impellers, which can improve the pump's service life and reduce unit noise. However, maintenance of multi-stage high-pressure centrifugal pumps is relatively difficult compared to single stage pumps;

3. When the actual head of the pump is less than 125 meters, the selection of a single stage pump or a multi-stage pump can be comprehensively considered based on factors such as the pump room area, pump price (multi-stage pumps are generally higher than single stage pumps), and so on.

With the advancement of technology, single stage impeller pumps can increase the pump head by increasing the pump speed, which can replace multi-stage high-pressure centrifugal pumps, but the price is slightly higher.