Siemens Energy, Inc.

Westinghouse Electric Corporation

James W Dorow

James C Bellows

Sudhir Rajagopalan

Zachary D Dyer

George C Altland

A process is provided for replacing a first nozzle block coupled to a nozzle chamber with a second nozzle block. The process may comprise removing the first nozzle block from the nozzle chamber. The nozzle chamber may comprise a main body having at least one inlet, at least one passage and at least one exit. The process may further comprise coupling inner and outer retaining rings to the nozzle chamber main body; engaging a second nozzle block with the inner and outer retaining rings; forming a bore so as to extend partly in one of the inner and outer retaining rings and the second nozzle block; and locating an anti-rotation pin in the bore.

Process for replacing a bolted-on nozzle block coupled to a nozzle chamber in a steam turbine

A method of increasing service interval periods in a steam turbine by neutralizing sodium hydroxide in contaminated steam in a high temperature and a high pressure portion of a steam turbine by placing a protective covering over at least a portion of each of the bolts of a nozzle block assembly. The protective covering neutralizes contaminants in contaminated steam to reduce stress cracking of the bolts during steam turbine operation, and thus extend the useful life of the bolts and reduce the need for service work to repair or replace damaged bolts.

Method of increasing service interval periods in a steam turbine

A steam turbine gland seal arrangement for use in a steam turbine which has at least one casing and a shaft extending through the casing so that steam may be admitted into the casing for operating on blades attached to the shaft for effecting rotation thereof. An inner gland and an outer gland are provided at one end of the shaft where the shaft exits the casing. Each of these glands support seals in close proximity with the shaft for preventing steam from escaping the casing. The inner gland is supported within an aperture in the casing where the shaft exits, and the outer gland is attached to an outer surface of the casing surrounding the aperture. The arrangement further includes an annular seal plate which circumscribes the turbine shaft and has an inner radial portion attached to an outer surface of the inner gland. An outer radial portion of the annular seal plate is cantilevered from the inner attached portion. The outer radial portion contacts an axially inner surface of the outer gland when this gland is attached to the casing. The outer gland exerts a deflecting pressure on the annular seal plate to provide a positive seal between the inner gland and the outer gland.

Growing community of inventors

Orlando, FL, United States of America

James W Dorow