| Failures Investigated and Resolved |
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TURBINES
Compressor Vibration
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Front and rear cone fits bearing looseness, and tie-bolt stretch.
- Premature compressor blade failure on initial start-up.
- Incomplete compressor cleaning
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Contamination Build-Up
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Evaporator cooling water contamination carry-over.
- Contamination in the compressor bleed valve resulting in compressor surge
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Combustor Failure
- Combustor distortion resulting from improper manufacturer/assembly.
- Combustor linear failure due to poor spot welding techniques.
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Distorted Temperature Pattern
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Unstable combustion pattern, NOx control water injection rate, and wrong orifice in the fuel nozzle NOx control water.
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High Thrust Bearing Temperatures
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Thermal distortion of the diffuser case.
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Disc Creep Failure
- Turbine blade failure due to high cycle fatigue.
Low time failures attributed to tracking operating hours and NOT "equivalent operating hours".
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Turbine Blade Failure
- Turbine blade failure due to high cycle fatigue.
ENGINES
Exhaust Duct Explosion
- Inadequate engine-generator control.
- Control component malfunction.
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Cylinder Liner Erosion
- Contaminated engine cooling water.
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Connecting Rods Bent/Broken
- Unbalance forces in piston.
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CENTRIFUGAL COMPRESSORS
Compressor Surge
- Mis-assembly of compressor stator following unit overhaul.
- Faulty adjustments in the surge control program.
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Cylinder Failure
- Variable volume pocket (VVP) improperly positioned resulting in inadequate clearance.
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Bearing Faillure
- Contaminated lubrication oil.
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Piston Rod Faillure
- Piston unbalance resulting in excessive flexing of the piston rod.
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