Abstract
This chapter describes the types, performance, and condition monitoring of screw compressors. Screw compressors have many inherent advantages over their competition in the low to medium flow range. As they are positive displacement compressors, like the reciprocating type, they will draw a constant inlet volume, can meet the varying differential pressure requirements of the process and are not significantly affected by gas density changes. The rotary motion significantly reduces the footprint of the screw compressor unit compared to other positive displacement alternatives. The result is an efficient, reliable compressor type that is very competitive from an initial cost and installed cost standpoint. Once the screw flute passes through the section volute, the compression phase begins and continues until the screw flute enters the discharge volute. The designer determines the length of the compression phase by the machine specified requirements. An advantage of oil flooded screw compressors is the efficiency of its capacity control system. The use of oil internal to the compressor allows the use of a slide valve in the compressor section of the compressor.
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