Question: Problem 3 (20 points): A cooling water system has the head characteristic given by: h = 15 + 0.0011 x Q2 Where the head, h,

Problem 3 (20 points): A cooling water system has the head characteristic given by: h = 15 + 0.0011 x Q2 Where the head, h, is in feet and the flow Q, is in GPM. The pump available for the system has the operating characteristics shown in the figure. (a) For a flow of 365 GPM, what size pump impeller would match the system head the closest? (b) What is the power gained by the fluid? 250 Design Speed 1750 RPM Suction line size 4 inch 200 13:5 inch Discharge line size 3 inch 55% 65% -_172% 12.875 inch/; 150 1 7:2% : $70% Head (feet) 100 :10 inch 5% 50 NPSH-R (FT) NPSH-R 0 300 400 500 600 700 800 O 100 200 GPM

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