In Moodys Example 6.6, the 6-inch diameter, 200-ft-long asphalted cast iron pipe has a
Chapter 6, Problem p6.93(choose chapter or problem)
In Moodys Example 6.6, the 6-inch diameter, 200-ft-long asphalted cast iron pipe has a pressure drop of about 280 lbf/ft2 when the average water velocity is 6 ft/s. Compare this to an annular cast iron pipe with an inner diameter of 6 in and the same annular average velocity of 6 ft/s. (a) What outer diameter would cause the fl ow to have the same pressure drop of 280 lbf/ft2 ? (b) How do the crosssection areas compare, and why? Use the hydraulic diameter approximation.
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