Centrifugal pump in series are used to overcome larger system head loss than one pump can handle alone. For two identical pumps in serie the head will be twice the head of a single pump at the same flow rate. With constant flowrate the combined head moves from 1 to 2. In practice the combined head and flow rated moved along the system curve to 3.

If one of the pumps stops, the operation point moves allong the system resistance curve from point 1 to point 2 - head and flow rate are decreased.

 Series operation of single stage pumps is seldom encountered - more often multistage centrifugal pumps are used. 

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2011-03-11

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