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Air Compressor Selection — Quick Reference
Air compressor sizing turns on: (1) CFM/LPM demand of your tools, (2) operating pressure (7-13 bar typical AU workshop), (3) duty cycle (intermittent vs continuous). Undersized compressor = tool starvation; oversized = wasted capital + power.
| Compressor Type | Best For | Typical CFM |
|---|---|---|
| Direct-Drive Portable (1-3HP) | Occasional + light workshop + DIY — limited duty cycle | 5-15 CFM @ 8 bar |
| Belt-Drive Single-Stage (2-5HP) | Light commercial + sustained workshop use | 10-25 CFM @ 8 bar |
| Belt-Drive Two-Stage (5-10HP) | Heavy workshop + continuous production | 20-40 CFM @ 12 bar |
| Screw Compressor (Industrial) | Continuous-duty industrial + commercial workshops | 30-200+ CFM @ 10-13 bar |
| Oil-Free Compressor | Paint + food + medical — clean dry air | Per spec |
| Petrol-Engine Portable | Site work + no mains power | 10-30 CFM |
| Diesel-Engine Portable | Heavy site + sustained outdoor | 30-100+ CFM |
| Air Receiver (Tank) Size | Storage + smooth output | 50L (light) / 200L (workshop) / 500L+ (industrial) |
Sizing rule: Total CFM demand of simultaneous tool use × 1.25 safety factor = required compressor CFM at operating pressure. AU standard pressure 90 PSI (6 bar) tool side; compressor 8-13 bar with regulator. Critical: Belt-drive compressors with cast-iron pumps last decades; direct-drive light-duty pumps last years. Match compressor class to duty cycle. Air prep mandatory: use FRL set after receiver (Filter + Regulator + Lubricator) — see FRL components. Companion: pneumatics, air guns, pneumatic fittings, air compressor guide.
Air compressors convert electrical or engine power into pressurised air for running pneumatic tools, spray equipment, blow guns, tyre inflation and a long list of plant and workshop tasks. The right unit depends on the air flow your tools need (measured in litres per minute or CFM), the pressure they need to operate (typically 7–13 bar in Australian workshops), and how continuously you run them.
What to look for
- Air flow (LPM or CFM) — add up the consumption of every tool you might run at once, then add 25–30% headroom.
- Tank size — bigger tanks reduce duty cycle and let pulse-loading tools (impact wrenches, sandblasters) run cleanly.
- Single-stage vs two-stage — two-stage compressors deliver higher pressure (10 bar+) and run cooler under load. Better for production environments.
- Oil-injected vs oil-free — oil-free units suit medical, food and dental applications. Oil-injected last longer under heavy industrial duty.
Need help spec'ing the right compressor for your workshop? Get in touch — we'll size it properly the first time.
Companion ranges: Pneumatics · Air Compressor Guide