Design conditions for a piping system are that the pump must deliver water at a flow rate of 180 gpm and generate 50 ft of total dynamic head to overcome the static head and friction head of the piping system.
a. Based on pump performance curves in Figure 13.23, size a pump impeller and drive that can meet these conditions.
b. Find water efficiency and net positive suction head required at the design conditions.

Figure 13.23

Transcribed Image Text:

TOTAL DYNAMIC HEAD (feet) 140 120 100 -5 in dia. IMPELLER SIZE 6 in diameter 4% in dia. 80 4% in dia. 4% in dia. 40 5% in dia. 604 in dia. 20 0 3% in dra. 3% in dia. 0 2 ft 50 55 3 ft 60 63 4 ft -66 -5f 1 1% BHP 6f ^ H /70 73/ 75 76 2BHP 40 80 120 160 PUMP CAPACITY (gallons per minute) 200 8 ft 77% EFFICIENCY BHP 10 ft 240 77 12 ft 76 280 3500 RPM 14 ft /73 5 BHP 16 ft X₁ 320 18 ft /20 ft NPSHr 7 63 60 59 -50 10 BHP 7% BHP 360