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.
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Required inside diameter D = √(4Q ÷ (π·v)). Typical design velocities: 1–2 m/s for pump suction, 1.5–3 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.