Estimation of Equivalent Sand–Grain Roughness for Coated Water Supply Pipes
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 11, Issue 1
Abstract
The Colebrook equation gives the Darcy-Weisbach friction factor for fluid flow in pipes as a function of sand-grain roughness and the Reynolds number. Values of equivalent sand-grain roughness () have been obtained for various ductile iron pipes coated with different anticorrosion materials through fluid flow experiments, and the results show that the value of calculated by the Colebrook equation varies significantly with the Reynolds number. Considering the uncertainty in the hydraulic data due to errors during lab measurements, the paper shows how to estimate a reasonable value of based on a systematic analysis of uncertainties for a pipe of given diameter, length, flow discharge, and head loss, as well as width, height, and head above the crest of sharp-edged weirs used for flow measurement. The values of for three pipe cases were estimated, and rules pertaining to uncertainty in the relevant parameters and the Reynolds number are summarized with quantitative relation expressions. A sensitivity analysis of the estimation of and some important practical findings are also provided.
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Data Availability Statement
All data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This research is financially supported by the National Key Research and Development Program of China (Grant No. 2016YFC0400605), the National Natural Science Foundation of China (Grant No. 51679262), and the IWHR Research & Development Support Program (HY0145B802017 and SKL2018TS07).
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 11 • Issue 1 • February 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 12, 2018
Accepted: Jun 27, 2019
Published online: Nov 27, 2019
Published in print: Feb 1, 2020
Discussion open until: Apr 27, 2020
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