Oil-free compressor hire is used when introducing compressor oil into the air stream presents an unacceptable process risk. Applications can include selected food, pharmaceutical, electronics, instrumentation and process work, depending on the required air standard.
Key points
- Used where contamination risk matters
- Common in specialised industrial processes
- Dryers and filtration may still be required
- Specify the air-quality requirement clearly
Define the required air quality
“Oil-free” addresses one contamination pathway but does not by itself specify moisture, particles or other contaminants. If the process has a formal compressed-air quality requirement, give that standard to the supplier.
Dryers, filtration and correctly sized downstream treatment may be required even with an oil-free compressor. Process-critical applications should be engineered rather than chosen from a generic size chart.
How to specify the job
Start with the equipment or process that will consume the air. Record the number of tools that may run at the same time, each tool's required airflow, and the highest operating pressure. For industrial temporary-air jobs, also note required air quality, duty cycle, connection size and whether the process can tolerate interruption.
Airflow, pressure and operating margin
Compressor capacity is usually described by airflow and pressure. In Australia you will commonly see airflow in CFM or m³/min and pressure in PSI or bar. The compressor must meet both requirements at the point of use. Long hose runs, fittings, filters and simultaneous demand can reduce effective performance, so a practical sizing margin is useful.
What to ask the hire supplier
Machine
Confirm rated free-air delivery, working pressure, fuel or electrical requirements and whether the exact model may vary.
Accessories
Ask about hoses, manifolds, aftercoolers, dryers, filtration, receivers, fittings and any tool-specific accessories.
Logistics
Confirm towing or delivery, access, placement, refuelling, collection, operating hours and any site induction requirements.
Safety
Follow the supplier's risk assessment and operating manual. Verify hose, coupling and accessory pressure ratings.
Use the sizing calculator
If your application is based on pneumatic tools, our calculator can total approximate airflow and suggest a compressor class. It is a planning tool only; final selection should be confirmed against the actual equipment specifications.
Open compressor calculator