M.02Pipe Pressure Drop
Calculate frictional pressure drop in straight pipe and fittings.
Results
- Pressure drop
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- Pressure drop
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- Head loss
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- Velocity
- —
- Reynolds number
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- Flow regime
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- Friction factor f
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- Per 100 m
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Formulas
- Reynolds number
- Re = ρ · v · D / μ
- Laminar flow
- f = 64 / Re (Re < 2300)
- Turbulent flow (Colebrook)
- 1/√f = −2 · log₁₀(ε/3.7D + 2.51/(Re·√f))
- Pressure drop
- ΔP = (f · L/D + ΣK) · ρv²/2
Assumptions
The calculation is for single-phase, incompressible, isothermal flow in a full circular pipe. Static pressure due to elevation change is not included.
References
- C. F. Colebrook, “Turbulent Flow in Pipes…”, J. Inst. Civil Eng., 1939
- Crane Co., Technical Paper No. 410: Flow of Fluids Through Valves, Fittings, and Pipe
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