Fluid Flow
CENTRIFUGAL PUMPS
Head
Hp
2
HP
1
n2
n1
2
48 ft
3600 rpm
1800 rpm
2
192 ft
Power
P2
P1
n2
n1
3
45 kW
3600 rpm
1800 rpm
3
360 kW
It is possible to develop the characteristic curve for the new speed of a pump based on the curve
for its original speed. The technique is to take several points on the original curve and apply the
pump laws to determine the new head and flow at the new speed. The pump head versus flow
rate curve that results from a change in pump speed is graphically illustrated in Figure 8.
Figure 8 Changing Speeds for Centrifugal Pump
Rev. 0
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