This paper describes new methods of cleaning large multistage axial compressors that are the part of Gas Turbine Unit (GTU). Existing, standard method of compressor cleaning are on-line and off-line. In both cases of compressor cleaning clean water and appropriate detergents are mixed to remove dirt deposits from the blade surface. The on-line system is attractive because the cleaning is done when GTU is under full load. The on-line compressor cleaning slows down inevitable dirt depositing. Offline cleaning is much more effective than on-line cleaning. The negative side of off-line cleaning is that GTU must be shut down. In case of large GTU the processes of shut down and start up require significant amount of time. This paper also incorporates the efforts required to install Inter-stage Injection System (IIS) in one GTU in Watson Cogeneration Company (WCC).

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