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Centrifugal Pump Parallel Operation Using Same Size Pumps

Parallel Pumping Using Same Size Pumps

Parallel Pumping Using Same Size Pumps

Operating two same size pumps in parallel the assumption is made that the flow will double. This however is not the case. In order to calculate the additional flow realized by running two identical pumps in parallel the following calculations must be made.

First let's look at the pump curve and system head curve with one pump running.

TDH

FLOW

130'

100 GPM

120'

190 GPM

110'

280 GPM

100

360 GPM

OPERATING POINT (A)

85'

470 GPM

Second let's look at the pump curve and system head curve with two pumps running.

TDH

FLOW

130'

200 GPM

120'

380 GPM

110'

560 GPM

100

720 GPM

OPERATING POINT (B)

105'

660 GPM

The addition of the second identical pump produces and extra 190 GPM and does not double the flow. Point C is the flow produced by each pump when both pumps are running.

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