Long Arc Shrouding—A Reliability Improvement for Untuned Steam Turbine Blading

[+] Author and Article Information
R. J. Ortolano

Engineering and Construction Department, Southern California Edison Co., Rosemead, Calif.

J. A. La Rosa

Steam Turbine Division Engineering, Westinghouse Electric Corp., Lester, Pa.

W. P. Welch

Marine Engineering Department, Westinghouse Electric Corp., Sunnyvale, Calif.

J. Eng. Power 103(3), 522-527 (Jul 01, 1981) (6 pages) doi:10.1115/1.3230753 History: Received June 14, 1977; Online September 28, 2009


An approach to the design and modification of untuned variable speed steam turbine exhaust blading has been found to be highly successful in eliminating fatigue failures due to the first tangential in-phase mode resonance. The approach consists of butt-welding the shrouds on the short arc blade groups to form a substantially longer arc length. The result is a significant reduction in vibratory stress at resonant speeds. Because of the ease with which the approach can be implemented in the field, backfitting is highly attractive to turbine operators. Availability benefits to the marine, utility, petrochemical, refining, industrial and commercial fields are anticipated.

Copyright © 1981 by ASME
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