# F11_hw04 - and plot them on the first copy of your pump...

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ENV 4561 Fall 2011 Homework # 4 Assigned: September 15, 2011 Due: September 22, 2011 The following figure represents the proposed pump stations within a collection system. Each pump station will see the noted flow rate and is sited at the listed elevations. The pump manufacturer has offered you a discount if you purchase the same model for each pump. This means that only one pump model will be used in the design, at various impeller diameters. See the following page for the pump curve. When sizing the pump, you may round to the nearest impeller size or trim the impeller to fit your operating point. (You will need to print five (5) copies of the curve for the homework. The green curves in the Figure represent the pump efficiencies.) Assume that n = 0.013 for the cast iron piping and assume each station has a head loss (or minor loss) of 7 ft. Water temperature is 70°F. (A) Determine the operating point for each pump station with all three four stations operating at once

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Unformatted text preview: and plot them on the first copy of your pump curve. Be sure to report the flowrate, operating head, diameter of the impeller and efficiency for each pump station. Note that the flow rate on the pump curve, which is the bottom of the page if you print it in landscape, is in gpm. (B) Plot the total dynamic head (TDH) system curve on separate pump curve figures for each station pumping alone and determine the operating points for the appropriate impeller diameter. Be sure to report the flowrate, operating head, impeller diameter and efficiency for each pump station. (C) Check the velocities of all sections to see if they fall within an acceptable range (2.5 to 5 ft/s.); otherwise, resize the pipe to comply with the desired velocities. DO NOT REDO THE PROBLEM. Segment PS-1 to A PS-2 to A A to B PS-3 to B B to C PS-4 to C C to D Length (ft) 2225 2900 2000 2850 2200 5280 2000 Diam (in) 8 8 14 10 18 10 20 PS-2 PS-1 PS-3 PS-4 PUMP CURVE...
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## This document was uploaded on 10/29/2011 for the course ENV 4601 at University of Florida.

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F11_hw04 - and plot them on the first copy of your pump...

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