Pipe Velocities

Calculate fluid flow and pipe velocity

Imperial units

A fluids flow velocity in pipes can be calculated with Imperial or American units as

v = 0.4085 q / d² (1)

where

v = velocity (ft/s)

q = volume flow (US gal. /min)

d = pipe inside diameter (inches)

SI units

A fluids flow velocity in pipes can be calculated with SI units as

v = 1.274 q / d² (2)

where

v = velocity (m/s)

q = volume flow (m³/s)

d = pipe inside diameter (m)

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