Fluid Mechanics · worked example

Water at 1.5 m/s in 4-inch schedule 40 pipe

Frictional pressure drop and head loss for water flowing at 1.5 m/s through 50 m of 4-inch schedule 40 steel pipe (102.26 mm bore, ε = 0.045 mm).

Inputs

Inside diameter	102.26 mm
Pipe length	50 m
Velocity	1.5 m/s
Density ρ	998 kg/m³
Viscosity μ	0.001 Pa·s
Roughness ε	0.045 mm

Result

Pressure drop	10.502 kPa
Pressure drop	1.5232 psi
Head loss	1.073 m fluid
Reynolds number	153083
Flow regime	Turbulent
Friction factor (Darcy)	0.01913

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

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More Pipe Pressure Drop examples

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• Water at 1.5 m/s in 8-inch schedule 40 pipe
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