Caused by the deregulated market and the entrance of new power sources, like wind farms, solar power etc. into the market, conventional steam power plants are nowadays operated with frequent start-ups and shutdowns. During lay-up time, general corrosion or even localized pitting corrosion can take place if no preservation measures are applied. The CECD (Cold End Corrosion Diagnostics) diagnostic method by Alstom enables a cause-and-effect analysis of corrosive attacks - supported by analytical and instrumentation data - and can also be used for determining whether there is a high probability of corrosion in the exhaust-steam area of condensing turbines. In addition the method allows selective modification of shutdown procedures so that it will be impossible that corrosive attacks occur during short-term downtimes, e.g. during weekend standstills for which normally no special preservation measures are taken. The paper will give a brief description of the method and mainly focuses on examples already carried-out successfully.
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