Caution: Using oil-free air compressors won't prevent oil and other contaminants from entering your system.
When air compressors are located in areas that have polluted or smelly air, then, so too will the compressed air being used for the work also be contaminated. Our compressed air system auditors are often tasked with determining the reason for ‘bad smelling’ compressed air; for example, we have visited large manufacturing facilities where employees had been sent home due to the odour in the compressed air. Most often, the cause of this is polluted air from the environment being drawn into the inlet of the air compressor.
Critical applications often call for oil-free air compressors, lending users a sense that the compressed air is cleaner, but often we see intakes to these air compressors coming from parking garages, or beside highways where the air is filled with pollutants.
Fact, if your oil-free air compressor is drawing air with oil particles and other contaminants, these oil particles and contaminants will ultimately end up in your compressed air, if appropriate compressed air treatment isn’t implemented.