Pipe Friction - Darcy-Weisbach
Pipe head-loss from Darcy-Weisbach equation - the fundamental pipe-friction calculation for any fluid system.
Head loss
2.336m
Formula, assumptions, and limits
Friction factor from Moody chart - Re + roughness ε/D. Smooth steel ε ≈ 0.045 mm. Add minor losses (K × v²/2g) for bends, valves, filters.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Pipe length | m | piping iso | |
| Inside diameter | m | pipe schedule | |
| Mean velocity | m/s | Q/A | |
| Darcy friction factor | - | Moody chart |