Determine the size of smooth 14-gage BWG copper tubing needed to convey 10. 1.3 Relative Roughness Factors for various New Clean Pipes 6 1.4 Head Loss through Conduits-Hazen and Williams Equation 7 1.5 Typical Roughness Coefficients 8 TABLE A Steel-Commercial 9 B Steel-Large Fabricated 15 C Steel-Galvanised27 D Ductile Cast Iron-Uncoated 35 E Ductile Cast Iron-Cement Lined 43 F Copper Tube 51. equations, is the average roughness of the interior surface of the pipe.It can be used to predict pressure drop or flow rate down such a pipe. In engineering, the Moody chart or Moody diagram (also Stanton diagram) is a graph in non-dimensional form that relates the Darcy-Weisbach friction factor f D, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe.Pipe Roughness Coefficients Type of Piping Material āCā Factor Unlined Cast/Ductile Iron Pipe 100 Cement-Lined Cast/Ductile Iron Pipe 140 Steel Pipe (Dry Systems/Pre-action Systems) 100 Steel Pipe (Wet Systems/Deluge Systems) 120 Galvanized Steel Pipe 120 Plastic Tubing 150 Copper Tubing 150 Note 1: Unli ned c ast iron and unl ine d duc.
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