Pipe Velocities

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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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Related Topics

• Fluid Flow and Pressure Drop - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more
• Fluid Mechanics - The study of fluids - liquids and gases. Involves various properties of the fluid, such as velocity, pressure, density and temperature, as functions of space and time.
• Pipe Sizing - Sizing steam and condensate pipes - pressure loss, recommended velocity, capacity and more

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