The basic objectives of on-line cleaning are to maintain the cleanliness of a gas turbine compressor after off-line washing, to maintain power and efficiency by minimizing ongoing losses, and to extend the operating period between shut-downs required for offline (crank) washing. On-line washing for fouling control has become increasingly important with base load combined cycle plants and CHP plants. It is also important for gas turbines in mechanical drive service, where little or no redundancy is installed and where the downtime associated with crank washing must be minimized.
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