4.25 A closed-loop pipe system similar to Figure 4.17 is being designed. At 300 gpm, the system curve indicates that the pump head is 120 ft. A 3 × 3 × 7B Bell &

Gossett Series 80-SC pump operating at 3525 rpm is to be specified for this application.

a. Specify the impeller diameter for this application.

b. What is the operating point of the pump and pipe system with the impeller diameter you specified in part (a)? Specify the capacity (gpm), head

(ft), brake horsepower input to the pump (hp), and efficiency of the pump.