The paper is concerned mainly with the oil-flooded type of screw compressor, which is largely used for portable machines from about 100 ft3/min up to the largest sizes, as well as for certain stationary and process purposes. The advance of the use of the screw compressor in the past decade is described, together with some of the technical problems that have been encountered. Recent developments in mechanical design, permitting higher outputs and pressures, together with changes in aerodynamic design enabling higher efficiencies to be obtained, are detailed. Various ancillaries, including the oil-separation system and control and protection equipment, are also discussed.
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