A compressor's power, expressed in kW, translates above all into the air flow it delivers (in litres per minute or m³/min). Choosing the right power means making sure the air flow covers the workshop's actual consumption.
Step 1: list your tools
Write down every air tool in the workshop and its air consumption, given by the tool manufacturer in the manual or on the technical data sheet. Sanders and spray guns consume a lot; an impact wrench consumes heavily but only for short periods.
Step 2: estimate what runs at the same time
Not all tools are ever used at the same time. Identify the busiest moment of the day and add up the consumption of the tools actually in use at that moment. It is this peak demand that determines the size of the compressor.
Step 3: add a margin
Allow a safety margin above the calculated demand: network losses, wear, and above all a new tool or workstation in the years ahead. A compressor that constantly runs at its limit wears out faster.
Step 4: check the pressure
Check that the compressor's maximum pressure covers that of the most demanding tool, taking into account the pressure drop in the network. A compressor's air flow is always stated at a specific pressure: compare machines at the same pressure.
Guidelines for the AIRSTAHL range
- 4 to 7.5 kW: garages and small workshops.
- 7.5 to 11 kW: body shops, joinery workshops, multi-station workshops.
- 15 to 22 kW: truck workshops, production, industry.
The air flow of each model is shown on its technical data sheet. The simplest option is to send us the list of your tools: we will do the calculation with you.