Steel (welded) pipe ā Darcy-Weisbach headloss
This page covers headloss calculation for Steel (welded) pipe using the Darcy-Weisbach equation ā the canonical pairing for High-pressure, large-diameter transmission.
Pipe parameters ā Steel (welded)
- Hazen-Williams C-factor (new)
- 140
- Hazen-Williams C-factor (aged)
- 100
- Absolute roughness (Īµ)
- 0.00015 ft
- Typical uses
- High-pressure, large-diameter transmission
Darcy-Weisbach method
Universal ā works for any fluid + any flow regime (laminar, transitional, turbulent).
Formula
h_f = f Ā· (L/D) Ā· (VĀ² / 2g)Limitations
Requires the friction factor f, which depends on Reynolds number and relative roughness ā typically evaluated via the Colebrook equation or Moody chart.