Air Flow Equations for working out the velocity of air coming through a hose or tube and the pressure loss of the air going through these.

Pipe VelocityChart

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Pipe velocity

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Pipe velocity Calculatormetric

Velocity of Air in Feet per Second = √(25,000 * Loss of Pressure in Ounces per Square Inch * Inside Diameter of the Pipe in Inches) / Length of Pipe in Feet

Loss of Pressure in Ounces per Square Inch = (Length of Pipe in Feet * Velocity of Air in Feet per Second2) / 25,000 * Inside Diameter of the Pipe in Inches