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International Journal of Rotating Machinery
Volume 2012, Article ID 142173, 14 pages
Research Article

Gas Turbine Health State Determination: Methodology Approach and Field Application

Dipartimento di Ingegneria, Università degli Studi di Ferrara, Via G. Saragat, 1-44122 Ferrara, Italy

Received 30 September 2011; Accepted 3 November 2011

Academic Editor: Rainer Kurz

Copyright © 2012 Michele Pinelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A reduction of gas turbine maintenance costs, together with the increase in machine availability and the reduction of management costs, is usually expected when gas turbine preventive maintenance is performed in parallel to on-condition maintenance. However, on-condition maintenance requires up-to-date knowledge of the machine health state. The gas turbine health state can be determined by means of Gas Path Analysis (GPA) techniques, which allow the calculation of machine health state indices, starting from measurements taken on the machine. Since the GPA technique makes use of field measurements, the reliability of the diagnostic process also depends on measurement reliability. In this paper, a comprehensive approach for both the measurement validation and health state determination of gas turbines is discussed, and its application to a 5 MW gas turbine working in a natural gas compression plant is presented.