Pipe Sizing by Velocity
Pick a pipe diameter for a flow rate and target velocity and check the actual velocity in standard DN sizes, free online.
About this calculator
Required inside diameter D = โ(4Q รท (ฯยทv)). Typical design velocities: 1โ2 m/s for pump suction, 1.5โ3 m/s for discharge lines and water supply, up to 5 m/s for short runs. The nearest standard nominal size above the calculated diameter is shown with its actual velocity.