Mechanical Behavior of an Industrial Gas Turbine under Fault Conditions, a Case History

Abstract

The resolve of journal bearing field problems and the full vibrational assessment of an industrial gas turbine, simple cycle rotor train, ABB’s GTllN2 is presented. Three units experienced several times damage of the journal bearings on the compressor end. The analysis of the damage, including tests, indicated that insufficient jacking oil flow was the cause. The jacking concept was corrected and starting history has proven reliable operation, resulting in not one additional failure.

Keywords

• Case history
• Journal bearings
• Rotordynamics
• Unbalance
• Vibration measurement
• Instability.