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Water Force Main Design Problem 1 - Determine Discharge of Pipe:
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Given a 10" PVC water line, 6300 feet long, carries water from an elevated water tank, determine the discharge from the end if there is 87 feet of head at the point of discharge.
The line has 7 tees, 8 valves, 5 - 90 degree elbows and 7 - 45 degree elbows in the line from the tank to the end of the line. Assume velocity head loss is negligible. |
1. From the force mains submenu open the equivalent length minor losses calculation, MinorLoss.aspx. Input the "Title" of the calculation, the "Designer/Checker" information and the variables.
Click on the "Calculate" button. Read the results. The equivalent length is 430 feet. So the total length of pipe to account for minor losses is 6300 ft + 430 ft = 6730 ft.
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2.
From the force mains submenu open up the pipe discharge calculation, FrictionQ.aspx. Input the "Title" of the calculation, the "Designer/Checker" information and the variables.
Open up the coefficient tables and determine the Hazen-Williams friction factor for PVC pipe and input that value. Click on the "Calculate" button. Read the results. The discharge is 1,720 gpm.
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5. Summary
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The discharge at the end of the pipe accounting for the minor losses is 1,720 gpm.
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