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What is the purpose of two centrifugal pumps in series? What are the characteristics?

Two centrifugal pumps are connected in series to improve the water supply pressure of the system.

The characteristic is that when the same pressure is obtained, the operation scheduling of two pumps in series is more flexible than that of a multi-stage pump. The installation position of the pump can also be flexible, for example; Can be installed in different pump rooms.

The two pumps are connected in series, and the working points of the pumps are respectively equal to the intersections of the characteristic curves of the two pumps and the characteristic curves of the pipelines, and the efficiency of the pumps is related to the characteristics of the pipelines.