An 11.5-in-diameter centrifugal pump, running at1750 r/min, delivers 850 gal/min and a head of 105 ftat best efficiency (82 percent). (a) Can this pump operateefficiently when delivering water at 20°C through200 m of 10- cm-diameter smooth pipe? Neglect minorlosses. (b) If your answer to (a) is negative, can thespeed n be changed to operate efficiently? (c) If youranswer to (b) is also negative, can the impeller diameterbe changed to operate efficiently and still run at1750 rev/min?

Two 32-in pumps from Fig.  are to be used in seriesat 1170 r/min to lift water through 500 ft of vertical castiron pipe. What should the pipe diameter be for most effi -cient operation? Neglect minor losses.

Ex ....... HYDRAUE • The pump is to be connected to a rising main which has a diameter (D) of 400 mm and a length of 137 m.The entry exit and minor head losses in the pipeline can be taken as 80D in this particular situation. The friction loss can be approximated by h; = ALQ² / 1 2D5 with A=0.04. The static lift is 10 m. By considering a single pump (P). And two of the pumps in series (P+P) and parallel (P//P) determine: > the H-Q curve of the two pump combinations » Which combination will be capable of discharging at least 0.3 m³/s, with the ability to pump up to 0.35 m³/s if the need arises. %3D

Water at 20°C fl ows through a pipe at 300 gal/min with afriction head loss of 45 ft. What is the power required todrive this fl ow?(a) 0.16 kW, (b) 1.88 kW, (c) 2.54 kW, (d) 3.41 kW,(e) 4.24 kW