5The 71-cm-diameter pump in Fig. 11.7a at 1170 r/min is 5m/ 3. used to pump water at 20°C through a piping system at 53 m min. (a) Determine the required brake horsepower. The aver- age friction factor is 0.018. (b) If there is 19.8 m of 30.5- cm-diameter pipe upstream of the pump, how far below the surface should the pump inlet be placed to avoid cavitation?

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