### Pump power calculations - sample problem -

(b) What is the corresponding pump shaft power? Solution: From the pump curve at the ﬂow rate of 2780gpm, the corresponding pump shaft power is 72bhp. (c) What is the wire to water efﬁciency? Solution: From Equation 1.10: h ww ¼ ðQ h=3960Þ 0:746 P e 100 ¼ ð2780 80=3960Þ 0:746 58 100 ¼ 72:2% (d) What is the pump efﬁciency?

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