The desire to extract ethane and propane from the natural gas produced by off-shore wells in the Gulf of Mexico, led to the erection of the Cryogenic Gas Processing Plant near Erath, Louisiana. This paper describes the application of a combined cycle (gas/steam turbine) for gas compression and transmission. The installation is none of, if not, the largest and most efficient combined cycles in mechanical drive service, capable of handling over 1200 MMscf/d of gas. The installation incorporates a gas turbine rated 46,800 hp at ISO conditions and a steam turbine rated 29,700 hp. In addition, the cycle incorporates the use of gas turbine variable inlet guide vanes, a supplementary fired waste heat recovery boiler and forced draft fan for independent steam turbine operation.

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