In the present paper a Fault Diagnosis system for a multishaft Centrifugal compressor included in an Integrated Gasification and Combined Cycle section of a refinement plant is illustrated.. The contribution of the paper is a new ANOVA-based procedure for the determination of the number of principal components. Both single and multiple faults which may cause errors in the sensor readings and/or in the process actuators have been considered. Trial results proved the goodness and the effectiveness of the proposed diagnoser on detection and isolation of faults assuring a satisfactory system promptness as well.
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