The Verification of Concentrated Impurities in Low-Pressure Steam Turbines

[+] Author and Article Information
W. G. Steltz

Steam Turbine-Generator Division, Westinghouse Electric Corporation

P. K. Lee

Physical and Inorganic Chemistry Department, Research and Development Center, Westinghouse Electric Corporation

W. T. Lindsay

Chemical Sciences Division, Research and Development Center, Westinghouse Electric Corporation

J. Eng. Power 105(1), 192-198 (Jan 01, 1983) (7 pages) doi:10.1115/1.3227387 History: Received June 18, 1982; Online September 28, 2009


The problem of corrosion-assisted low-pressure blade failures is discussed from the water chemistry and aerothermodynamic viewpoints. The physical chemistry of particular steam impurities existing in low-pressure steam turbines is reviewed with special applicability to blade path steam conditions. The interaction of the turbine expansion line with the salt solution zone has been verified by field testing which has, for the first time, demonstrated the existence of concentrated impurities within the low pressure turbine blade path. In addition, the existence of low levels of moisture as measured by an optical moisture probe offers strong evidence that the expansion process in low-pressure steam turbines takes place, on the average, in thermodynamic equilibrium, at least in the vicinity of the saturated vapor line.

Copyright © 1983 by ASME
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