In high-speed turbo machinery utilizing journal bearings, proximity probes are employed to measure shaft vibration. These probes assess the relative vibration of the shaft. Relying solely on vibration spectrum analysis can be misleading. Differentiating the source of vibration issues, whether originating from the bearing or from scratches on the shaft (particularly in the probe tracking area), can be achieved through time waveform and orbit analysis. The following examples demonstrate how shaft scratches were identified using time waveform and orbit analysis.

Key takeaways:

· Attendees will gain insights into distinguishing between shaft scratches and bearing problems.

· Attendees will understand the decision-making process for corrective actions following fault identification.

· Attendees will learn about the effective use of orbit analysis and waveform data.