Abstract: Variable vane assemblies and methods for removing and assembling variable vane assemblies in turbine systems are provided. In one embodiment, a variable vane assembly includes a variable stator vane and an outer casing. A generally annular ring channel is defined in the outer casing. The variable vane assembly further includes a ring segment disposed in the ring channel, and a stem extending from a radially outer end of the variable stator vane at least partially through the ring segment. In another embodiment, a variable vane assembly includes a variable stator vane and a ring segment. The variable vane assembly further includes a stem extending from a radially outer end of the variable stator vane and configured to extend at least partially through the ring segment, and a stem extension configured to couple with the stem and protrude from the ring segment.

Abstract: A method of replacing an inlet guide vane from a lower inlet casing of a compressor, the lower inlet casing adapted to be secured to an upper inlet casing at a horizontal joint, and after removal of the upper half of the inlet casing but with a rotor of the compressor remaining in place, wherein the inlet guide vane is supported between radially inner and outer walls of the lower inlet casing, and further wherein the inlet guide vane is formed with an integral stem that extends radially through the outer wall and supports a drive gear on its outer end that engages an annular gear rack, the method including a) removing the gear on the radially outer end of the integral stem of the inlet guide vane; b) shearing the inlet guide vane into two cut portions; c) removing the cut portions from inside the lower inlet casing; and d) replacing the inlet guide vane by a modified inlet guide vane having a two-piece stem assembly that enables installation without removal of the rotor.