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Excellent resources for petrochemical and heavy industry case studies.

3. Case Study 2: Identifying Severe Angular Misalignment in a Steam Turbine-Generator Background

| Day | gE Peak | Action | | :--- | :--- | :--- | | 0 | 0.5 gE | Baseline | | 7 | 2.1 gE | Monitoring increased | | 12 | 8.5 gE | | | 14 | 15.4 gE | Motor replaced |

Findings:

Outcome:

Spectral analysis revealed distinct non-synchronous peaks at 118 Hz, accompanied by multiple harmonics.

A Bode Plot and Impact (Bump) Test were performed. The analysis showed that the machine’s natural frequency was nearly identical to its running speed (1X). This is known as resonance.

Every effective case study follows a structured diagnostic path:

Companies like Emerson (AMS) , SKF , and ACOEM publish extensive case studies on their websites. Their application notes are essentially practical case studies in PDF format.

24.6 Hz×4.8=118.08 Hz24.6 space Hz cross 4.8 equals 118.08 space Hz

Unusual noise, high temperature, or a spike in overall vibration levels.