The New England Electric System Tests Effectiveness of Stop-Valve Bypass in Reducing Thermal-Stress Gradients in Steam Turbines

[+] Author and Article Information
E. F. Walsh

New England Electric System, Boston, Mass.

R. L. Jackson

Large Steam Turbine-Generator Department, General Electric Company, Schenectady, N. Y.

J. Eng. Power 84(4), 372-385 (Oct 01, 1962) (14 pages) doi:10.1115/1.3675053 History: Received July 28, 1961; Online January 10, 2012


The stop-valve bypass valve enabling full-arc admission starting is now being utilized extensively as a means of reducing transient thermal-stress gradients in steam turbines. This paper describes, with the aid of start-up test graphs, the results of an intensive series of tests conducted by the New England Electric System, which was designed to determine the effectiveness of this bypass valve. One of the machines tested was equipped with an electrical long-range speed governor which was used to bring the turbine to speed in a predetermined and accurately controlled way. This installation represents the first successful application of this device on a General Electric Company steam turbine-generator. A brief description is included.

Copyright © 1962 by ASME
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