ABSTRACT Oil and gas production requires compression of gases involving considerable range of initial inlet and final discharge pressures as well as widely varying volumes. Frequently the applications are further complicated by the gas containing H2S or entrained liquids and equipment space/weight limitations imposed by offshore platform designs or semi-portability due to future relocation plans onshore. The manufacturers of compressors, engines and gas turbines have responded to these requirements with a broad selection of power and compressor machinery to make possible an optimum selection for any given installation.