Answered: Suction Line is 50 ft of 4 inch Steel…

Solid Waste Engineering

3rd Edition

ISBN:9781305635203

Author:Worrell, William A.

Publisher:Worrell, William A.

Chapter5: Separation Processes

Section: Chapter Questions

Problem 5.27P

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Question

The pumping system shown below is supposed to provide at least 250 GPM of water to the drinking trough. The outlet of the drawn tubing at the drinking water trough discharges to the atmosphere as a water jet. The outlet of the pipe is approximately 12 ft higher than the water surface of reservoir. Expected water temperature is 70ᵒF. Your objective is to select a pump and check its performance for the specified system. Your tasks include: 1. Determine total dynamic head (TDH) operating against the pump for the design flow rate. Neglect minor losses. Note that H-W is not appropriate for this water temperature, and you need to use D-W. 2. Use the TDH and Qdesign to approach a pump vendor. She provides you the attached four pump performance curves for your consideration. 3. Select the appropriate pump based on the fit of the selection point on the pump performance curves. 4. Develop the system curve. 5. Determine the pump operating point and record the system operating conditions (Capacity, TDH, efficiency, power required by pump, and NPSH required). 6. Check for cavitation. Calculate NPSHA and check against NPSHR. The pump elevation is 10 ft above the water surface elevation at reservoir. Include minor losses in calculation of NPSHA (Kinlet = 1.0, Kelbow = 0.4). Atmospheric pressure is 14.7 psia