When choosing an air compressor, understanding the flow and pressure requirements for any installation is vital. The laws of physics state that an increase in pressure creates a decrease in flow. This correlation is important to bear in mind when determining the required size of a compressor based solely on its rated motor power. For example, a basic 7 bar compressor driven by a 15 kW motor will deliver air at a maximum volume of approximately 45 l/s. However, the free air delivery from a 10 bar version will be only 37 l/s from the same 15 kW unit. An increase in working pressure by 1 bar increases the power requirement by approximately 6 per cent if the flow stays the same. While it is perfectly natural for buyers to seek best performance for the least outlay, it should be recognised that right from entry level to premium specification compressor equipment, competitive suppliers’ kW ranges are not always directly comparable. Keep in mind also that rotary screw air compressors tend to output greater flow per kW than piston compressors. Undersizing a compressor is likely to result in pressure drops and an inability to complete important tasks, while oversizing a machine can lead to future mechanical problems and excessive energy demands from within the system.
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