From electricity to machine work
A compressor uses mechanical work to compress air. Compression heats the air, so cooling is part of the system. The compressor is usually followed by air treatment, storage and distribution to consumers. Their order and design depend on operating requirements, not on one universal arrangement.
Three questions before choosing
Pressure determines, among other things, the force of a pneumatic actuator. Flow rate indicates how much air is available per unit of time. Purity protects both equipment and the product. Higher pressure cannot replace missing flow, and a larger motor alone does not confirm compressor suitability.
What to check in practice
- List consumers, their consumption and the pressure required at each connection.
- Identify which machines operate simultaneously and how long demand peaks last.
- Add requirements for water, oil and particles, ambient temperature and operating hours.
Example scenario
Two machines each need 300 L/min of air expressed at the same reference conditions. When running together, they require 600 L/min, not higher pressure. Design must also include losses, air treatment and a suitable reserve based on actual operation.
What to watch out for
- Choosing solely by motor power in kW.
- Continually raising pressure instead of finding restrictions in the pipework.
- Assuming industrial air is automatically suitable for breathing.
Is a larger compressor always the safer choice?
No. An oversized machine may run unloaded for long periods or switch frequently. Design should follow the consumption profile; sometimes a brief peak can be covered by stored air rather than a permanently larger machine.