cast-iron pipe was installed 50 years ago with a measured friction factor, f, of 0.02 and surface roughness height, e, of 0.2mm. The horizontal pipe is 1500m long and has a diameter of 35cm. Since installation, significant tuberculation has developed on the inside walls of the pipe. A recent pipe test was conducted. The pressure drop across the entire length of pipe was measured to be 200kPa. The design discharge through the pipe has not changed over the years (Q=0.1m 3 /s, T=20°C). Determine the current effective friction factor, f, and surface roughness, e, after years of tuberculation buildup

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter6: Hydraulic Conductivity
Section: Chapter Questions
Problem 6.14P
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A cast-iron pipe was installed 50 years ago with a measured friction factor, f, of 0.02
and surface roughness height, e, of 0.2mm. The horizontal pipe is 1500m long and has a diameter of
35cm. Since installation, significant tuberculation has developed on the inside walls of the pipe. A recent
pipe test was conducted. The pressure drop across the entire length of pipe was measured to be 200kPa.
The design discharge through the pipe has not changed over the years (Q=0.1m 3 /s, T=20°C). Determine
the current effective friction factor, f, and surface roughness, e, after years of tuberculation buildup.

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