Performance diagnostics throughout the life cycle is of high relevance for controlling operating and maintenance of power and process plants. Monitoring systems based on gas path analysis can make a considerable contribution to the enhanced availability of turbomachinery. In order to carry out performance diagnostics, an accurate thermodynamic model has to be specified. Building a precise model for different types of turbomachines requires an exact layout of the turbine. In particular, for each engine type layout data and engine design parameters have to be specified. The present study describes the individual phases for conducting performance diagnostics using the gas path analysis method for a specific gas turbine. It shows how design data are modelled, component characteristics of compressor and turbine specified and instrumentation data assessed. Furthermore, the study demonstrates how additional reengineering is carried out in order to achieve an adequate thermodynamic model of the gas turbine. The implications of the results for applying this performance diagnostics technique to turbomachines are discussed.
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