Fluid Mechanics · worked example

Water at 25 m³/h in 4-inch schedule 40 pipe

Velocity, Reynolds number, and flow regime for 25 m³/h of water in 4-inch schedule 40 steel pipe (102.26 mm bore).

Inputs

Flow rate	25 m³/h
Inside diameter	102.26 mm
Density ρ	998 kg/m³
Viscosity μ	0.001 Pa·s

Result

Velocity	0.846 m/s
Velocity	2.774 ft/s
Reynolds number	86292
Flow regime	Turbulent
Mass flow	24950.0 kg/h
Flow area	8213.0 mm²

These values are computed by the Pipe Velocity & Reynolds calculator. Open the tool to change any input.

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More Pipe Velocity & Reynolds examples

• Water at 10 m³/h in 2-inch schedule 40 pipe
• Water at 10 m³/h in 4-inch schedule 40 pipe
• Water at 10 m³/h in 6-inch schedule 40 pipe
• Water at 25 m³/h in 2-inch schedule 40 pipe
• Water at 25 m³/h in 6-inch schedule 40 pipe
• Water at 50 m³/h in 2-inch schedule 40 pipe