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Compressed Air Pipe Size Calculator

Estimate minimum internal pipe diameter from free-air flow, line pressure, temperature and target velocity.

Compressed Air Pipe Size Calculator

FREE ONLINE TOOL

Minimum internal diameter

21.1474 mm

Actual line airflow

126.4468 L/min

Air velocity

6 m/s

Formula and assumptions

Qline = Qfree × (1.01325/Pabs) × (T/293.15); D = √(4Qline/(πv))

Velocity-based estimate, not a pressure-drop or nominal pipe schedule selection. Ambient pressure assumed 1.01325 bar. Select a real internal diameter at least as large, then check losses including fittings. Rejects velocities above Mach 0.3.

Technical reference: Atlas Copco — Compressed Air Manual

STEP BY STEP

How to use compressed air pipe size calculator

  1. Check the input units and assumptions.
  2. Review the result and example.

IN PRACTICE

Example

1000 L/min free air, 7 bar(g), 20 °C, 6 m/s: D ≈ 21.15 mm.

GOOD TO KNOW

Which model does this calculator use?

Velocity-based estimate, not a pressure-drop or nominal pipe schedule selection. Ambient pressure assumed 1.01325 bar. Select a real internal diameter at least as large, then check losses including fittings. Rejects velocities above Mach 0.3.

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