Fluid Mechanics · worked example

Water at 3 m/s in 1-inch schedule 40 pipe

Frictional pressure drop and head loss for water flowing at 3 m/s through 50 m of 1-inch schedule 40 steel pipe (26.64 mm bore, ε = 0.045 mm).

Inputs

Inside diameter	26.64 mm
Pipe length	50 m
Velocity	3 m/s
Density ρ	998 kg/m³
Viscosity μ	0.001 Pa·s
Roughness ε	0.045 mm

Result

Pressure drop	209.951 kPa
Pressure drop	30.4508 psi
Head loss	21.452 m fluid
Reynolds number	79760
Flow regime	Turbulent
Friction factor (Darcy)	0.02491

These values are computed by the Pipe Pressure Drop calculator. Open the tool to change any input.

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