What are some factors to consider when trying choosing between a dry screw compressor and an oil-flooded screw compressor?

What are some factors to consider when trying choosing between a dry screw compressor and an  oil-flooded screw compressor?
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1 Answer

Answer :

Screw compressors utilize a pair of “meshing” helical screws to compress gases. These types of  compressors a generally appropriate for a flow range of 85-170 m3/h (3000-6000 acfm) and discharge  pressures in the range of 2070-2760 kPa (300-400 psig). As the name implies, dry screw compressor run  dry while oil-flooded compressors use oil for bearing lubrication as well as to seal the compression  chamber. The oil also carries the heat from the compression away from the compressor. This heat is  typically rejected to an external heat exchanger. Some factors to consider when choosing between the  two types of screw compressors include
Is the process gas compatible with the oil? If the answer is no, use dry type Does the process gas have to  be oil free? If the answer is yes, use dry type is efficiency the top priority. If the answer is yes, use oil flooded type Are you looking to minimize shaft-seal leakage. If the answer is yes, use oil-flooded type  Are there any liquids in the incoming gas. If the answer is yes, use oil-flooded type Does the gas contain  small particulate matter? If the answer is yes, use dry type these and other guidelines can help in  choosing between the two types of screw compressors.
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