Abstract
A large number of thermal power stations built in the 1950s and 1960s have reached their theoretical life expectancy and the manufacturers and operators of the plants are increasingly confronted with the question as to the actual life of the major components. The residual life potential of highly stressed turbine components is fundamentally defined on the basis of the virgin conditions, such as sizing data, design know-how and manufacturing technology, and the actual but relatively unknown life history, and cannot be determined theoretically when the components have been in service for decades. Only when the actual condition or the existing property profile of the components is determined by destructive and non-destructive tests on the basis of theoretical forecasts and expertise of the materials engineer concerning the manufacturing and testing techniques employed, is it possible to assess the suitability of the components for further operation. This paper includes, by way of an example, some results of tests on bolts and castings stressed in long-term operation.
Published Version
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