Scott R Kendall

US Patent:

48470392, Jul 11, 1989

Filed:

Dec 11, 1987

Appl. No.:

7/131693

Inventors:

Scott W. Kendall - Orlando FL
George J. Silvestri - Winter Park FL

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

F01D 1718

US Classification:

376297

Abstract:

A method and apparatus for reducing thermal stress in steam turbines having steam chests with a plurality of linearly-arranged valves controlling respective nozzle chambers. By crosstying selected pairs of the valves, and selectively admitting steam through the crosstie, transfers of the turbine from a full-arc admission mode to a partial-arc admission mode, and vice versa, can be made with a minimum temperature differential.

US Patent:

48507938, Jul 25, 1989

Filed:

Oct 13, 1987

Appl. No.:

7/107735

Inventors:

George J. Silvestri - Winter Park FL
Scott W. Kendall - Orlando FL

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

F01D 1718

US Classification:

415 38

Abstract:

Existing steam chests having a plurality of valves which are incapable of operation by individual high pressure valve actuators may be modified to provide apparatus for transferring operation of a steam turbine at less than a full load betweeen a full-arc admission mode and a partial-arc admission mode. For those steam chests of the internal bar lift type, the outboard valves are disconnected from the bar and coupled directly to respective servomotors. As such, the pre-existing servomotor utilized to lift the internal bar, as well as the additional servomotors for the outboard valves, are operatively connected to a conventional control means. In those steam chests of the external bar lift type, an additional servomotor is coupled through an actuator rod to the pre-existing pivot point of the external bar, and is thereafter controlled by conventional means for interactively activating the pre-existing servomotor and the additional servomotor.