Abstract: A transport device includes a first segment fixedly coupled to a wall. The transport device also includes at least one second segment coupled to the first segment. The at least one second segment includes at least one of a fluid-driven device, a rack and pinion drive device, and a carriage. The transport device further includes an automated position control system. The control system includes at least one axial positioning device coupled to the at least one second segment. The control system also includes at least one axial position feedback device coupled to at least one of the first segment and the at least one second segment.

Abstract: A transport device includes a first segment fixedly coupled to a wall. The transport device also includes at least one second segment coupled to the first segment. The at least one second segment includes at least one of a fluid-driven device, a rack and pinion drive device, and a carriage. The transport device further includes an automated position control system. The control system includes at least one axial positioning device coupled to the at least one second segment. The control system also includes at least one axial position feedback device coupled to at least one of the first segment and the at least one second segment.

Abstract: A system and method are provided for controlling cooling air flow for pressure modulation of turbine components, such as the turbine outer sidewall cavities. The pressure at which cooling and purge air is supplied to the turbine outer side wall cavities is modulated, based on compressor discharge pressure (Pcd), thereby to generally maintain the back flow margin (BFM) so as to minimize excessive leakage and the consequent performance deterioration. In an exemplary embodiment, the air pressure within the third stage outer side wall cavity and the air pressure within the fourth stage outer side wall cavity are each controlled to a respective value that is a respective prescribed percentage of the concurrent compressor discharge pressure. The prescribed percentage may be determined from a ratio of the respective outer side wall pressure to compressor discharge pressure at Cold Day Turn Down (CDTD) required to provide a prescribed back flow margin.

Abstract: A method is provided for controlling cooling air flow for pressure modulation of turbine components, such as the turbine outer sidewall cavities. The pressure at which cooling and purge air is supplied to the turbine outer side wall cavities is modulated, based on compressor discharge pressure (Pcd), thereby to generally maintain the back flow margin (BFM) so as to minimize excessive leakage and the consequent performance deterioration. In an exemplary embodiment, the air pressure within the third stage outer side wall cavity and the air pressure within the fourth stage outer side wall cavity are each controlled to a respective value that is a respective prescribed percentage of the concurrent compressor discharge pressure. The prescribed percentage may be determined from a ratio of the respective outer side wall pressure to compressor discharge pressure at Cold Day Turn Down (CDTD) required to provide a prescribed back flow margin.

Abstract: A system and method are provided for controlling cooling air flow for pressure modulation of turbine components such as the turbine outer sidewall cavities. The pressure at which cooling and purge air is supplied to the turbine outer side wall cavities is modulated, based on compressor discharge pressure (Pcd), thereby to generally maintain the back flow margin (BFM) so as to minimize excessive leakage and the consequent performance deterioration. In an exemplary embodiment, the air pressure within the third stage outer side wall cavity and the air pressure within the fourth stage outer side wall cavity are each controlled to a respective value that is a respective prescribed percentage of the concurrent compressor discharge pressure. The prescribed percentage may be determined from a ratio of the respective outer side wall pressure to compressor discharge pressure at Cold Day Turn Down (CDTD) required to provide a prescribed back flow margin.