This paper explains how to obtain and manage reliable information on current and planned performance of turbines by using an appropriate method for planning and controlling turbine degradation. In this paper a useful calculation method is described to manage the performance of gas turbine driven centrifugal compressors. The method is based on the knowledge of its current performance of installations and their degradation. The paper consists of 4 parts: 1. general information about turbine fouling and deterioration, 2. calculation methods, 3. measurements influences, 4. field results.
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