TCR22

Common issues

• Compressor-side deposits leading to reduced efficiency and potential surging.
• Turbine-side fouling causing increased exhaust back pressure and reduced power output.
• Bearing temperature rise indicating wear, lubrication issues, or rotor imbalance.
• Rotor imbalance causing excessive vibration, accelerated bearing wear, and potential catastrophic failure.
• Oil leakage from bearing housing seals, leading to oil consumption and fire hazard.
• Air filter clogging, restricting air intake and potentially causing surging or reduced boost.
• Erosion or foreign object damage (FOD) to compressor or turbine blades.

Inspection checklist

• Verify operational parameters: boost pressure, exhaust gas temperatures (in/out), bearing temperatures, and turbocharger RPM (if monitored). Compare to normal operating ranges.
• Listen for unusual noises (whining, grinding, rubbing) and feel for excessive vibration on the casing and bearing housing.
• Conduct a thorough external visual inspection for oil/water/exhaust gas leaks, cracks in the casing, loose securing bolts, and insulation integrity.
• Inspect the air filter element for cleanliness and damage; clean or replace as necessary.
• If accessible, visually check the compressor wheel for deposits, erosion, foreign object damage, and signs of blade tip rubbing.
• If accessible, visually check the turbine wheel and nozzle ring for fouling, erosion, cracks, and foreign object damage.
• Check the bearing housing for oil leaks from seals and drain lines. Verify oil level and condition if applicable.
• Inspect the lubrication oil supply and drain lines for kinks, blockages, or leaks. Check oil cooler cleanliness if fitted.
• Confirm the functionality of the overspeed trip mechanism (review test records) and alarm settings.

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 Assembly (including seals and O-rings).
• Gasket and O-ring Set (for casing, oil lines, air intake).
• Air Filter Elements (multiple sets).
• Impeller Nut (critical for securing compressor wheel).
• Washing Nozzles/Lances (for compressor and turbine washing).
• Nozzle Ring (if prone to wear/fouling and difficult to clean in situ).
• Overspeed Trip Sensor/Actuator (if electronic/pneumatic).

Safety

• High surface temperatures (casing, exhaust pipes) exceeding 400°C, posing severe burn hazards. Ensure insulation is intact.
• High-speed rotating components (rotor operates at tens of thousands of RPM). Risk of catastrophic failure (rotor burst) if imbalance or bearing failure occurs. Never open casing while running.
• Pressurized air intake and exhaust gas systems. Ensure proper depressurization and isolation before any maintenance.
• Hot exhaust gas during operation and maintenance. Risk of burns and asphyxiation if not properly ventilated and isolated.
• Oil mist or leaks onto hot surfaces can create a significant fire hazard.

Class survey

The class surveyor will typically check for evidence of routine maintenance (logbook entries for washing, bearing inspections, overspeed trip tests). They will verify current operational parameters (boost pressure, temperatures, RPM) against design values and previous records, looking for trends indicating degradation. A thorough external visual inspection for leaks (oil, exhaust gas), cracks, loose fastenings, and general cleanliness is paramount. Insulation integrity and the functionality of safety devices (overspeed trip, alarms) will be confirmed. Availability of critical spare parts as per manufacturer's recommendations and the vessel's Planned Maintenance System (PMS) will also be verified.