On a gas turbine propulsion vessel, you notice a slow but steady increase in gas turbine vibration and specific fuel consumption as the voyage has progressed. What would be a good maintenance technique to use to correct these increases?
• Gas turbine compressor fouling and how it affects vibration and fuel consumption over time • Difference between on-line (in-place) water wash and off-line water wash for gas turbines • Which turbine section (compressor vs. power turbine) is most commonly cleaned to restore efficiency
• Which part of the gas turbine, when it gets dirty during a voyage, most commonly causes gradual increases in vibration and specific fuel consumption? • Is an on-line water wash as thorough as an off-line water wash, and when is each method typically used? • Would changing operating settings (RPM, variable stator vanes) fix the underlying cause, or just mask the symptoms?
• Identify which choice actually removes deposits/contamination rather than just changing operating parameters. • Determine which section (compressor or power turbine) is normally water washed to correct fouling that develops during normal service. • Verify which method (on-line vs. off-line) is known to be more effective for a thorough cleaning when performance has already noticeably degraded.
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