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Centrifugal Pump Parallel Operation Using Different Size Pumps

Parallel Pumping Using Different Size Pumps

Parallel Pumping Using Different Size Pumps

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

First let's look at the pump curve and system head curve with the 3" pump running.

TDH

FLOW

90'

0 GPM

87.5'

50 GPM

85'

100 GPM

80'

160 GPM

OPERATING POINT (A)

70'

300 GPM

Second let's look at the pump curve and system head curve with the 4" pump running.

TDH

FLOW

90'

360 GPM

87.5'

410 GPM

85'

460 GPM

80'

470 GPM

OPERATING POINT (B)

87.5'

410 GPM

Third let's look at the pump curve and system head curve with the both the 3" & 4" pump running.


TDH

FLOW

90'

360 GPM

87.5'

460 GPM

85'

560 GPM

80'

580 GPM

OPERATING POINT (C)

87.5'

460 GPM

With the 4" pump running and then adding the 3" pump produces an extra 50 GPM. Point D is the flow produced by the 3" pump when both pumps are running. Point E is the flow produced by the 4" pump when both pumps are running.


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