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A piping system is shown below. Flow is from A to D and minimum pressure to be maintained is 20 psi.
Pipe
Length (ft)
Diameter (in)
Flow rate (gpm)
A-B
20,000
6
120
B-C
10,000
160
C-D
30,000
4
Hazen-Williams roughness coefficient C=140 for all the pipes. The elevations of A, B, C and D are 620, 460, 540, and 360 ft respectively.
Determine:
. Hydraulic gradient at A
. Pressure A, B, C, and D
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