Results are for reference only. Check these numbers against other sources before relying on them for a real system design.

Engineering · fluids

Pipe Flow & Pressure Drop

Darcy–Weisbach, the Moody diagram, and what it costs to push a fluid through a pipe.

Darcy–Weisbach · Swamee–Jain
turbulent

Set-up

define the run

Flow rate Q

20.0 L/s

Pipe size & material

Internal diameter (if custom)

100 mm

Pipe length L

50 m

Fluid

Units

metric imperial

drag the marker along the curve · or use the flow slider

laminar (f = 64/Re) other roughness curves your pipe's curve log–log axes: friction factor f vs Reynolds number Re

Results

Flow detail

Relationships

amber markers track your current run

Pipe library

roughness values are typical references, not certificates

Field notes