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The results showed a significant peak in the vibration spectrum at 1x running speed, indicating a potential imbalance issue. Further analysis revealed that the turbine’s rotor was indeed imbalanced, causing the excessive vibration.
To correct the issue, the maintenance team balanced the rotor and re-tested the turbine using vibration analysis. The results showed a significant reduction in vibration levels, confirming that the imbalance had been successfully corrected.
A vibration analysis was conducted using a handheld vibration analyzer, which revealed a distinct peak in the vibration spectrum at 2x ball pass frequency (BPFI). This indicated a potential bearing fault.