TCR20

Common issues

• Compressor fouling (due to intake air quality or lube oil carry-over)
• Turbine inlet fouling (especially with heavy fuel oil operation, leading to reduced efficiency and surge)
• Bearing and thrust part wear (axial and radial bearings, often due to oil contamination, insufficient lubrication, or rotor imbalance)
• Seal ring leakage (gas and oil side, leading to oil consumption or gas ingress into lube oil system)
• Rotor imbalance (caused by fouling, blade damage, or bearing wear, leading to increased vibration)
• Cracks in turbine casing or nozzle ring (thermal stress, material fatigue)
• Oil contamination or degradation (leading to premature bearing failure)

Inspection checklist

• Visual inspection of compressor impeller and diffuser for fouling, erosion, or damage (e.g., bent blades, foreign object damage)
• Visual inspection of turbine blades and nozzle ring for fouling, erosion, cracks, or burning marks
• Check axial and radial play of the rotor shaft by hand (measure if possible with dial gauge) - compare to manufacturer's limits
• Inspect for oil leakage around bearing casings, seals, and drain lines
• Check security of all mounting bolts, clamps, and connections (air ducts, exhaust pipes, oil lines)
• Inspect air filter condition and cleanliness (if fitted upstream)
• Check cleanliness and integrity of the oil supply and drain lines, including sight glass (if present)
• Listen for unusual noises or vibrations during operation (whining, grinding, surging)
• Verify functionality of water washing system (if installed) and ensure drain is clear

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Complete bearing cartridge set (axial and radial bearings, thrust collar)
• Seal rings (gas side and oil side)
• O-rings and gaskets for casing joints and oil lines
• Air filter elements (if applicable)
• Impeller nut and locking washer
• Set of mounting bolts and nuts for casing sections (for overhaul)

Safety

• High surface temperatures (exhaust casing, turbine housing) - severe burn hazard
• High-speed rotating components (rotor) - potential for catastrophic failure (burst) if imbalanced or overspeeded
• High noise levels during operation - hearing protection required
• Pressurized air and exhaust gas lines - risk of injury from leaks or sudden depressurization
• Hot exhaust gases during inspection/maintenance - ensure proper cooling down and ventilation

Class survey

The class surveyor will typically review the vessel's maintenance records for the turbocharger, including logbook entries, service reports, and records of bearing renewals or major overhauls. They will conduct a visual inspection for external damage, oil leaks, security of mounting, and general cleanliness. Operational checks for unusual noise or vibration may be performed if the engine is running. The surveyor will also verify the availability of critical spare parts onboard and confirm that the unit's safety devices (e.g., overspeed trip, if fitted) are in good order and tested as per schedule. Particular attention is paid to any signs of distress that could indicate an imminent failure, such as excessive vibration or high bearing temperatures.