Pipe friction: Darcy–Weisbach head loss

Set the pipe length, diameter, velocity and friction factor to see the head loss and pressure drop.

Works in metric or imperial units.

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Questions students ask

Where does the friction factor come from?

The Moody chart, from the Reynolds number and the pipe's relative roughness. For laminar flow f = 64/Re.

What formula does it use?

h_f = f (L/D) V²/(2g).

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