Due to the increased water demands in a growing city a new p

Due to the increased water demands in a growing city, a new part of the water system needs to be designed. The Civil Site department tells you that there is a nearby reservoir with a80 water elevation of 35 ft. You need to designa system that will pump the water to another reservoir with a water elevation of 97 ft. The flowrate through the system must be at least 1200 gpm. Losses in the system (including major and minor) total 8 ft 100% 80 60 40 20 0 Efficiency 70 60 50 40 1 80 60 40 20 If a 12-in. centrifugal pump with performance characteristics as shown on the right is chosen and operated at 1000 rpm, answer the following: 10 0 1000 2000 3000 4000 5000 o, gal/min

Solution

Answer:- (d) 90%

From graph, we see that maximum efficiency is 90%. Efficiency of centrifugal pump is 90%.