A Bell & Gossett Series e-80 6x6x7B pump operating at 1750 rpm with a 6.75-inch impeller is being used to transport water from a large tank as shown in Figure P4.55. The water is at a temperature of 20°C and is being delivered at a rate of 160 m3/h. The suction line is 6-nom sch 40 commercial steel pipe that is 40 m long. Atmospheric pressure is 1 bar.

a. Determine the maximum height above the water surface that the pump can be installed to prevent cavitation (m).

b. Investigate the effect of the water temperature by plotting the maximum height as a function of the water temperature for 10°C < T < 80°C.