When a factory compressor fails, replacing nameplate capacity with a rental of the same nominal size is not always the best method. Actual demand, pressure, air quality and redundancy requirements should drive the temporary-air plan.
Key points
- Start with measured plant demand where possible
- Plan connection points before delivery
- Air quality and dew point may be critical
- Consider redundancy for production-critical loads
Measure before the breakdown where possible
Factories that depend on compressed air benefit from recording normal pressure and demand before an emergency occurs. Existing plant data, flow meters or compressor controller histories can help a rental supplier size temporary equipment more accurately.
The temporary connection itself deserves planning. Identify isolation valves, connection sizes, available space, exhaust or electrical requirements and whether the process requires dried or filtered air.
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