Consider the flow system shown in Problem 8.94. Assume the minimum NPSHR at the pump inlet is \(15 \mathrm{ft}\) of water. Select a pump appropriate for this application. Use the data for increase in friction factor with pipe age given in Problem 10.52 to determine and compare the system flow rate after 10 years of operation.

Data From Problem 10.52

Data From Problem 8.94

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10.52 Consider the pump and piping system of Problem 10.51. Esti- mate the percentage reductions in volume flow rate that occur after (a) 20 years and (b) 40 years of use, if the pump characteristics remain constant. Repeat the calculation if the pump head is reduced 10 per- cent after 20 years of use and 25 percent after 40 years. Use the data in the table below for the effect of age on the multiplier of the friction factor. Pipe Age (years) Small Pipes, Large Pipes, 4-10 in. 12-60 in. New 1.00 1.00 10 2.20 1.60 20 5.00 2.00 30 7.25 2.20 40 8.75 2.40 50 9.60 2.86 60 10.0 3.70 70 10.1 4.70