TCA

Common issues

• Compressor fouling leading to reduced air flow, increased charge air temperature, and potential surge.
• Turbine nozzle ring and blade fouling/erosion, resulting in increased exhaust back pressure, reduced turbine efficiency, and higher exhaust temperatures.
• Bearing wear (journal and thrust) due to contaminated lubricating oil, insufficient oil pressure/flow, or excessive vibration/imbalance.
• Rotor imbalance caused by uneven deposits on blades, blade damage, or bearing wear, leading to increased vibration and potential component failure.
• Exhaust gas leaks from casing joints, expansion bellows, or inspection covers, posing safety risks (burns, fire) and reducing engine performance.
• Foreign object damage (FOD) to compressor impeller or turbine blades, causing imbalance, efficiency loss, and potential catastrophic failure.
• Air filter clogging, restricting air intake and leading to reduced engine power and increased turbocharger speed for the same load.
• Malfunction or ineffectiveness of the water washing system, accelerating fouling rates.

Inspection checklist

• Monitor turbocharger RPM, bearing temperatures (inlet/outlet oil), and vibration levels (local or CMS) during operation. Note any deviations from normal operating parameters.
• Visually inspect the compressor and turbine sides (via inspection ports or during opening) for fouling, erosion, cracks, or foreign object damage on blades and nozzle ring.
• Check exhaust gas casing, expansion bellows, and charge air piping for leaks, cracks, and integrity of insulation. Ensure all fasteners are tight.
• Inspect the lubricating oil system: verify oil level, pressure, and temperature. Check oil filter condition and review recent oil analysis reports for contamination or degradation.
• Verify the functionality and effectiveness of the water washing system (if fitted) for both compressor and turbine sides.
• Inspect the air filter element for clogging or damage, and check differential pressure across it.
• Check foundation bolts and anti-vibration mounts for tightness, corrosion, and integrity.
• Listen for unusual noises such as rubbing, grinding, or excessive whistling, which may indicate bearing wear or rotor imbalance.
• Inspect the charge air cooler for fouling and leaks; check differential pressure across the cooler.

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 set of journal and thrust bearings (including sleeves and pads).
• Labyrinth seals / Seal rings (compressor and turbine side).
• Gasket and O-ring set for casing joints, inspection covers, and oil lines.
• Lubricating oil filter elements.
• Water washing nozzles (if applicable).
• Air filter elements (if applicable, or raw filter material).
• Spare rotor complete with shaft, compressor impeller, and turbine wheel (cartridge) - highly recommended for critical applications or remote operations.

Safety

• High surface temperatures of the exhaust gas casing and associated piping (up to 450°C), posing severe burn hazards. Ensure insulation is intact and undamaged.
• Potential for casing rupture due to overspeed, internal explosion (e.g., scavenge fire), or structural failure. Ensure casing relief valves are clear, unpainted, and functional.
• Extremely high rotational speeds (up to 20,000 RPM for large units); never attempt to open inspection covers or work near the turbocharger while the engine is running.
• Hot exhaust gases and charge air under pressure; leaks can cause severe burns or injury. Always depressurize and cool down before maintenance.
• Proper lockout/tagout procedures must be strictly followed during any maintenance to prevent accidental engine start-up or turbocharger rotation.

Class survey

During class surveys, the surveyor will typically check for: review of maintenance records, running hours, and performance logs (RPM, temperatures, pressures, vibration trends). External visual inspection for leaks (oil, exhaust gas, charge air), cracks, foundation integrity, and insulation condition. Verification of safety devices, including casing relief valve condition and overspeed trip functionality (if applicable). Lubricating oil system checks (pressure, temperature, filter, oil quality reports). During Special Survey or as required by condition, internal inspection of compressor and turbine sides for blade condition, nozzle ring, diffuser, and bearing clearances/condition will be required. Compliance with manufacturer's service schedule and classification society rules is paramount.