Question

4.45 A two-tank pump/pipe system has a head requirement of 23.4 ft at a flow rate of 100 gpm. The elevation difference between the fluid surfaces in the tanks is 10 ft. The pump is a Bell & Gossett Series e-80 Model 2.5x2.5x9C operating at 1170 rpm with a 7.5-inch impeller. a. Develop an cquation for the system curve. b. Use a computer program to develop an equation for the 7.5-inch impeller using data read from the pump performance curve c. Determine the capacity (gpm) and head (ft) of the pump/pipe system by simultancously solving the pump curve and system equations. d. Use the pump performance curve to determine the power draw (hp) and efficiency of the pump. You have two points on the curve known, at 0 elevation and at 100 gpm at 23.4 ft. The relationship is a parabola symmetric about the y-axis and off set by the tank elevation. That should be enough information to allow you answer more than one part of this question.

Answer 1

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4. (25 pts.) A pipe flow system requires a head pressure of 20 ft of water at 0 gpm. Additionally, the calculations show that the total head loss in the piping system is 80 ft of water at a flow rate of 500 gpm. A centrifugal pump with the characteristies shown below (at I160 rpm) is available. (a) Plot the pipe flow system characteristic curve. Is this pump suitable for the pipe flow system if we require 300 gnm.of flow rate through the pump and the pipe flow system? Explain and if so, select a suitable impeller size for this application. (b) Assuming the pump speed is changed to 2000 rpm, what are the expected flow rate, pipe flow system head losses and the pump power requirements at this speed. Model 4013 FM Serles 20 500