The test data for few gas turbine models produced by General Electric Oil & Gas are statistically evaluated and allow to draw an experimentally based transfer function between vibrations recorded by non-contact and seismic probes. shaft vibrations (velocity / displacement) is demonstrated in order to assess the risk of the bearing rub. In the second part, a statistical approach based on correlation of support vs. Here several failure modes and diagnostics observations are illustrated with the examples of real-life data. In the first part, the undertaken approach and the results are illustrated based on the field and theoretical experience of the authors about the failure modes related to alarm level of vibrations. In many situations, the reliability function is not well-defined, and more comprehensive methods of determining the harmful effects of support vibrations are desirable. As a rule such limits follow ISO 10816-4 or API616, although in field operation it is not well known relationship between these limits and failure modes. The paper deliberates vibration limits for non-rotating parts in application to industrial gas turbines.
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