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# F11_hw03_answers - ENV 4561 Assigned September 8 2011 Fall...

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ENV 4561 Fall 2011 Homework # 3 Assigned: September 8, 2011 Due: September 15, 2011 1) (25 points) Compute the headloss in feet of a 350 ft long, 1.5” pipe containing sludge (solids) with the following conditions: Answers may vary slightly a) Q = 25 gpm; 3% and 6% solids h L for 3% = 17.5 ft, h L for 6% = 26.15 ft b) Q = 18 gpm; 9% and 1% solids h L for 9% = 23.7 ft, h L for 1% = 9.3 ft c) How big must the pipe be to pump 45 gpm at 4 % solids and have a head loss equal to 14 ft? Assuming the same length of pipe. Round your answer to the nearest diameter of commercially available Schedule 40 PVC pipe. (Google is your friend here) D pipe = 2.5 in 2) (25 points) Given the piping system shown below, calculate the Q ( in GPM ) conveyed between the two tanks. Assume e (or k) = 0.3 mm, water temperature = 20 o C. Also, assume hydraulically rough flow conditions. Account for all losses and show all work . Elevations shown below are in feet . Answers may vary slightly, Q = 41.15 gpm WSE 331.6 TOC EL 286 CL 320.1 1 2 3 4 5 6 7 CL 301.2 CL 255.4 WSE 246.3 TOC EL 235 List of Abbreviations CL – Center Line EL- Elevation

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