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Engineering ToolBox > Pipe Velocities
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)
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)