Figure shows a system curve overlaid on a set of Bell & Gossett Series e-1531 Model 6BD at 1770 rpm pump curves. The flow requirement for the system is 1300 gpm. a) Specify the pump's impeller diameter for this application First for the impeller size specified in part (a), determine: b) The head of the pump/pipe system c) The power input to the pump d) The efficiency of the pump e) The Cutoff head of the selected pump TOTAL HEAD E Series e-1531 100- 30 25 20 10. 80- 60- 40- 20- 0 9.5" 0 9" 8.5" 8" 7.5" L 500 100 50% 60% 200 71% 78% 83% 36% 1,000 15HP 1,500 300 CAPACITY 400 88% 86% 20HP 2,000 Bell & Gossett 6BD 1770 RPM 83% 63% 78% 25HP 500 71% 30HP 40HP NPSHr 2,500 Date: 12/31/2013 600 3,000 11 NPSHr (Ft) (M) 40 0 12 8 4 0 (GPM) (M/H)