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Compare OIL FREE ROTARY SCREW COMPRESSORS. Oil free rotary screw compressors are the workhorses for oil freecompressor applications. The water cooled rotary screw compressors provide compressed air for those applications where the presence of oil is not permitted for health or safety reasons.
Even though the water helps to cool and reduce the friction of the rotary screw compressor moving parts, there is more wear than with and oil injected compressor. Particle filters are recommended at the output of rotary oil free compressors. Also, the air dryer capacity has to be higher than for standard rotary compressors.
As the air is drawn into the rotary screws, water is injected to absorb the heat generated by the friction between the screws as well as against the compressor housing. At the exit of the rotary screw compressor, a particle filter and an after cooler are usually standard. The compressed air must then be run through additional air drying systems.
The air capacity FAD is the measure of free air delivery
