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Pipe Roughness Calculator
Calculate relative roughness (ε/D) and Darcy friction factor for any pipe material. Use Colebrook-White equation for turbulent flow in drilling mud systems, production tubing, and pipelines.
Inputs
Steel: 0.0018", smooth drawn: 0.00006"
Re = ρvD/μ
Results
Equations
Relative roughness: ε/D (dimensionless)
Swamee-Jain: f = 0.25 / [log10(ε/(3.7D) + 5.74/Re⁰·⁹)]²
Typical ε: Commercial steel 0.0018 in, galvanized 0.006 in, smooth drawn 0.00006 in.
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