Oil Free Compressors
CompAir have a range of oil free water lubricated screw compressors. Unique in the market, these compressors utilise water as a coolant and sealant for the screw elements. The benefit of using water as a coolant is that it keeps temperatures much lower than on a non lubricated oil free compressor. This has significant efficiency benefits and also removes the need for a two stage machine that significantly increases the capital cost of the original compressor.
Another benefit of the water lubricated units is that since it is direct drive there is zero oil in the unit as a whole so there is zero chance of oil getting into the compression element whatever happens to the compressor. Most another oil free compressors have oil in the compressor gearbox so in extreme circumstances oil can leak from the gearbox into the compression elements.