Two reservoirs A and B are connected with a long pipe that has characteristics such that...

 

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Two reservoirs A and B are connected with a long pipe that has characteristics such that the head loss through the pipe is expressible as hr. = 220, where he is in feet and Q is the flow rate in 100's of gpm. The water surface elevation in reservoir B is 30 ft above that in reservoir 4. Two identical pumps are available for use to pump the water from A to B. The characteristic curve of each pump when operating at 1600 rpm is given in the following table. Operating at 1600 Head, ft 100 Flow rate, gpm 0 90 100 80 170 60 230 40 280 20 305 At the optimum point of operation, the pump delivers 170 gpm at a head of 75 ft. Determine 1) The specific speed N, of the pump. 2) The rate of flow under the following conditions a) A single pump operating at a 1400 rpm b) Two pumps in series, each operating at 1400 rpm c) Two pumps is parallel, each operating at 1400 rpm Two reservoirs A and B are connected with a long pipe that has characteristics such that the head loss through the pipe is expressible as hr. = 220, where he is in feet and Q is the flow rate in 100's of gpm. The water surface elevation in reservoir B is 30 ft above that in reservoir 4. Two identical pumps are available for use to pump the water from A to B. The characteristic curve of each pump when operating at 1600 rpm is given in the following table. Operating at 1600 Head, ft 100 Flow rate, gpm 0 90 100 80 170 60 230 40 280 20 305 At the optimum point of operation, the pump delivers 170 gpm at a head of 75 ft. Determine 1) The specific speed N, of the pump. 2) The rate of flow under the following conditions a) A single pump operating at a 1400 rpm b) Two pumps in series, each operating at 1400 rpm c) Two pumps is parallel, each operating at 1400 rpm