ZHU Zhi-wei,SHAO Xin-zheng,YU Jun.Sensitivity Study on Friction Coefficient of Ductile Iron Pipe[J].China Water & Wastewater,2021,37(10 10):147-153.
Sensitivity Study on Friction Coefficient of Ductile Iron Pipe
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
10 10
Page:
147-153
Column:
Date of publication:
2021-05-17
- Abstract:
- Based on the uncertainty evaluation theory, the hydraulic friction coefficient of large diameter ductile iron pipe was measured in situ. The influence factors of hydraulic friction coefficient, including pipe diameter D, velocity v, water temperature T and equivalent roughness k, were analyzed. The results show that the pipe diameter D varied widely, and the resulting friction coefficient changed the most. In the range of DN80-DN2 600, Manning roughness coefficient n increases from 0.008 5 to 0.010 8, and Hazen-Williams coefficient Ch increases from 142 to 150. If the influence of pipe diameter D is not considered in engineering design, the maximum calculation error of head loss along the pipeline can reach 54% (Chezy-Manning formula) and 10% (Hazen-Williams formula) respectively with fixed friction coefficient. It is suggested that Darcy’s formula and Colebrook-White formula should be used in engineering design for hydraulic calculation, and the equivalent roughness k=0.10 mm should be used as the design value of ductile iron pipelined with cement mortar.
Last Update:
2021-05-17