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How to convert PPMw (by weight) to PPMv(Volume) for H2S & moisture(H2O) in gas mixture?
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Submitted Chris Haslego, Nov 21 2011 11:21 AM | Last updated Nov 21 2011 01:29 PM

Category:	Fluid Dynamics
Question:	What are some factors to consider when trying to choose between a dry screw compressor and an oil-flooded screw compressor?
Keywords:	v1i12,screw,compressor,compressors,oil,flooded,dry,choosing
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 typeDoes the process gas have to be oil free? --If the answer is yes, use dry typeIs efficiency the top priority? --If the answer is yes, use oil-flooded typeAre you looking to minimize shaft-seal leakage? --If the answer is yes, use oil-flooded typeAre there any liquids in the incoming gas? --If the answer is yes, use oil-flooded typeDoes the gas contain small particulate matter? --If the answer is yes, use dry typeThese and other guidelines can help in choosing between the two types of screw compressors.
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