3

for a given piping system. As an example, for a required flow rate of 2,350 gpm (8,895 L/m) at 365 ft (111 m) head loss, an impeller size of 10.5 in. (26.7 cm) has been selected. On the 3,500 rpm pump curve shown in Figure 31-25, the brake power is calculated, based on Equation 31-5, as follows:

HL x gpm 365 x 2,350

The affinity laws can also be used to calculate performance of the selected pump at reduced speed. For example, at 1,750 rpm, flow rate would be calculated using Equation 31-6 as follows:

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Guide to Alternative Fuels

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