Pipe Roughness Coefficients Table Charts

Fluid Flow Table of Contents
Hydraulic and Pneumatic Knowledge
Fluid Power Equipment

This table lists the roughness Coefficients of Specific roughness, Hazen-Williams Coefficient and Manning Factor.

Pipe Material Roughness Coefficients
Pipe Material

Specific Roughness
Factor, • , mm (in)

Hazen-Williams
Coefficient, C
Manning Factor, n
Steel, welded and seamless
0.061 (0.0002) 140 -
Ductile Iron
0.061 (0.0002) 130 -
Ductile Iron, asphalt coated
0.12 (0.0004) 130 0.013
Copper and Brass
0.61 (0.002) 140 0.010
Glass
0.0015 (0.000005) 140 -
Thermoplastics
0.0015 (0.000005) 140 -
Drawn Tubing
0.0015 (0.000005) - -
Sources:
Hydraulic Institute, Engineering Data Book.
Various vendor data compiled by SAIC, 1998.

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