Free Pneumatic Cylinder Air Consumption Calculator
Calculate free air consumption (SCFM and L/min), extension and retraction thrust forces, and required compressor HP for automation systems.
💨 Cylinder & Operating Parameters
📊 Air Consumption & Thrust Force
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Frequently Asked Questions
What is the formula for pneumatic cylinder air consumption?
Air Consumption (SCFM) = (Piston Area in sq ft × Stroke in ft × Compression Ratio × CPM) for extension plus rod-annulus volume for retraction. The compression ratio equals (Gauge Pressure PSI + 14.7) / 14.7.
Why is retraction force lower than extension force on a pneumatic cylinder?
On the return stroke, the piston rod passes through the cylinder chamber. The effective surface area exposed to air pressure equals the full piston bore area minus the rod cross-sectional area (A_net = A_bore - A_rod). This reduces both force and air volume.
How many CFM does an average air compressor produce per horsepower?
As a general rule of thumb, industrial compressors produce between 3.8 and 4.2 CFM per horsepower at 90–100 PSI. A 5 HP compressor typically yields around 18 to 20 CFM of Free Air Delivered.
Should I size the compressor for continuous or peak pneumatic consumption?
Compressors should be sized based on average continuous consumption with an appropriately sized receiver tank to buffer intermittent peak demands. The receiver tank supplies high surge flow during rapid cylinder cycling without causing line pressure drops.