ClarityHow to use this tool
- Enter darcy friction factor, pipe length, internal diameter, fluid density, mean speed.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
Pressure drop = f(L/D)ρv²/2.
Using darcy friction factor = 0.02, pipe length = 100 m, internal diameter = 0.1 m, fluid density = 1000 kg/m³, mean speed = 2 m/s, the result is 40000 Pa. Change these example inputs to match your task; use the method above to check each step.
Understanding your result
Use the Darcy factor, which is four times the Fanning factor. Fittings, elevation changes and compressibility are excluded.
What to keep in mind
Use the Darcy factor, which is four times the Fanning factor. Fittings, elevation changes and compressibility are excluded. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.
Common questions
How do I use this darcy weisbach pressure drop calculator?
Estimate straight-pipe friction pressure loss using a supplied Darcy friction factor. Enter darcy friction factor, pipe length in m, internal diameter in m, fluid density in kg/m³, mean speed in m/s. The starting example is editable; use values for the same system or project.
Which assumptions affect this result?
Use the Darcy factor, which is four times the Fanning factor. Fittings, elevation changes and compressibility are excluded.
Methodology maintained by ClarityKit. How these tools are built and checked.