Calculator
Result
Results are theoretical estimates in free air (atmospheric conditions). Leakage, dead volume, fittings and valve losses are not included, so actual consumption is usually higher.
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| Type | Bore | Rod | Stroke | Tube | Cycles | Pressure | L/min | m³/day | m³/year |
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How is air consumption calculated?
A pneumatic cylinder performs each stroke with compressed air, which is exhausted to atmosphere afterwards. Consumption equals the cylinder volume multiplied by the compression ratio. The ratio is (operating pressure + 1.013) / 1.013, which converts compressed air into its free air equivalent at atmospheric pressure.
In a double acting cylinder, the piston side area (A) and the rod side area (A − a) are each filled over the stroke. In a single acting cylinder only one direction is pressurised. Tube volume is added because it fills and empties on every cycle.
Air per cycle = [π/4 × D² × stroke × (operating pressure + 1.013) / 1.013]
Double acting: use D² for the piston side and (D² − d²) for the rod side, and add both strokes.
Consumption per minute = air per cycle × cycles per minute. Daily and annual figures follow from operating hours and working days.
Worked example
Take a double acting cylinder with 32 mm bore (12 mm rod) and 100 mm stroke, running at 6 bar and 30 cycles per minute (tubing excluded). It uses about 1.04 litres of free air per cycle, which is about 31 litres per minute or 1.9 m³ per hour. Running 8 hours a day for 250 days gives about 3,700 m³ per year. Enter the same values in the calculator above to check.
Ways to reduce air consumption
- Fix leaks; most compressed air losses in a plant are leakage.
- Do not run a higher pressure than needed; set it to what the application requires.
- Choose bore and stroke to suit the job; an oversized cylinder wastes air.
- Keep tubing short and mount valves close to the cylinder.
- Shut off lines that consume air while the machine is idle.
Frequently asked questions
How do you calculate pneumatic cylinder air consumption?
Multiply the cylinder volume (area × stroke) by the compression ratio (operating pressure + 1.013) / 1.013. For a double acting cylinder, calculate both directions and add them. Multiply by the cycle rate to get consumption per minute.
What is free air (FAD/ANR)?
Free air is the volume that compressed air would occupy at atmospheric pressure. Compressor outputs and pneumatic consumption figures are therefore given in litres per minute or m³ per hour of free air.
Why do single and double acting cylinders consume different amounts?
A single acting cylinder uses compressed air in one direction only, while a spring returns it. A double acting cylinder uses air in both directions, and the rod volume makes the two directions slightly different.
Is the result equal to real consumption?
No, it is a theoretical estimate. Leakage, dead volume, fittings and valve losses are not included, so real consumption is usually somewhat higher. Leave a safety margin when sizing a compressor.
Can you help me select the right cylinder?
Yes. Send us your application and dimensions and we will prepare a quotation for product selection and supply.
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