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Pyrometer mount for a closed-circuit thermal medium cooled gas turbine

United States Patent

July 30, 2002
View the Complete Patent at the US Patent & Trademark Office
A steam-cooled second-stage nozzle segment has an outer band and an outer cover defining a plenum therebetween for receiving cooling steam for flow through the nozzles to the inner band and cover therefor and return flow through the nozzles. To measure the temperature of the buckets of the stage forwardly of the nozzle stage, a pyrometer boss is electron beam-welded in an opening through the outer band and TIG-welded to the outer cover plate. By machining a hole through the boss and seating a linearly extending tube in the boss, a line of sight between a pyrometer mounted on the turbine frame and the buckets is provided whereby the temperature of the buckets can be ascertained. The welding of the boss to the outer band and outer cover enables steam flow through the plenum without leakage, while providing a line of sight through the outer cover and outer band to measure bucket temperature.
Jones; Raymond Joseph (Duanesburg, NY), Kirkpatrick; Francis Lawrence (late of Galway, NY), Burns; James Lee (Schenectady, NY), Fulton; John Robert (Clifton Park, NY)
General Electric Company (Schenectady, NY)
09/ 400,863
September 21, 1999
This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.