Static Pressure Drop Calculator
Calculate the static pressure drop in a pipe or duct using the Darcy-Weisbach equation. Supports both laminar and turbulent flow with the Colebrook-White friction factor.
Sum of all fitting/valve K values (elbows, valves, etc.)
Results will appear here.
Formulas Used
Reynolds Number:
Re = ρ·V·D / μ
Darcy Friction Factor:
Laminar (Re < 2300): f = 64 / Re (Hagen-Poiseuille)
Turbulent (Re ≥ 2300): Colebrook-White equation (iterative):
1/√f = −2 log₁₀( ε/(3.7·D) + 2.51/(Re·√f) )
Dynamic Pressure:
q = ½·ρ·V²
Major Pressure Drop (Darcy-Weisbach):
ΔP_major = f · (L/D) · q
Minor Pressure Drop:
ΔP_minor = K_total · q
Total Pressure Drop:
ΔP_total = ΔP_major + ΔP_minor
Assumptions & References
- References: Moody (1944); White, F.M. Fluid Mechanics, 8th ed.; Colebrook & White (1937), Proc. R. Soc. London.