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The assessment of existing components of power producing facilities is based on probabilistic methods of the theory of reliability provided in Eurocodes and ISO standards. An example of quickclosing valves in a selected hydroelectric power plant indicates the assessment of reliability and the prediction of the remaining working life of a structural...
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... considered for the parameter B in the range from 0.03 to 0.13 mm and for the parameter C from 0.6 to 0.7 mm, see e.g. [11]. It might be assumed here for non-uniform corrosion B = 0.06 mm, and C = 0.7 mm (9) based on the results of the inspection of the actual state of steel quick-closing valves. Pitting corrosion with pits up to 2 mm is shown in Fig. 5. It is considered that the steel cover plate of quick-closing valves having age of about 50 years is gradually deteriorating due to non-uniform corrosion with the average one-side decrease up to 1 mm and about 30 % probability of simultaneous weakening at the opposite side of the cover plate. Therefore, the model of corrosion ...
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