TPS-E 52-E

Common issues

• Bearing wear (journal and thrust) due to oil contamination, insufficient lubrication, or high operating loads, leading to increased clearances and vibration.
• Compressor and/or turbine fouling (sooting on turbine, dirt on compressor) reducing efficiency and potentially causing surging.
• Oil leakage from bearing casings (often labyrinth seals) into the exhaust gas or compressor air side, indicating seal wear or blocked drain lines.
• Rotor imbalance and vibration caused by fouling, blade damage (FOD), or bearing wear, leading to accelerated component degradation.
• Cracks in turbine casing or exhaust gas manifold due to thermal stress, leading to gas leaks and reduced performance.
• Surging of the turbocharger, often linked to engine load changes, dirty compressor, or incorrect matching, causing high stress on components.
• Damage to compressor or turbine blades (erosion, foreign object damage - FOD), leading to reduced efficiency and potential catastrophic failure.

Inspection checklist

• Check rotor free rotation by hand (engine stopped, turning gear engaged if necessary) and listen for abnormal rubbing sounds.
• Measure and record axial and radial rotor clearances using a dial gauge, comparing against manufacturer's limits.
• Inspect compressor wheel for dirt, erosion, foreign object damage, and blade tip condition. Check air filter condition.
• Inspect turbine wheel and nozzle ring (if accessible) for fouling, erosion, cracks, and foreign object damage.
• Check bearing condition (if accessible) and inspect oil inlet/outlet lines for leaks, proper flow, and oil quality (visual check, smell).
• Inspect turbocharger casing for cracks, exhaust gas leaks, oil leaks, and ensure all mounting bolts are secure.
• Verify proper functioning of the turbocharger's safety devices, including the overspeed trip mechanism (if fitted) and pressure relief valves.
• Check exhaust gas manifold, expansion bellows, and insulation for leaks, damage, or degradation.
• Monitor and record turbocharger performance parameters (RPM, boost pressure, exhaust gas temperatures before/after turbine, scavenge air temperature) against baseline values and engine load.

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 (journal and thrust bearings)
• Labyrinth seals (compressor and turbine side)
• Gasket and O-ring sets for casing, oil lines, and inspection covers
• Air filter elements (if external filter is used)
• Lubricating oil filter elements (if separate oil system)
• Nozzle ring segments (if applicable and prone to wear/damage)
• Set of securing bolts and nuts for critical connections

Safety

• High surface temperatures of the turbine casing and exhaust gas piping, requiring proper insulation and guarding to prevent burns.
• High-speed rotating machinery (rotor operates at tens of thousands of RPM), posing a severe hazard if components fail or guarding is removed.
• High noise levels during operation, necessitating hearing protection in the vicinity.
• Pressurized air and exhaust gas systems, requiring caution during inspection and maintenance to prevent uncontrolled release.
• Risk of oil mist ignition or fire, especially in case of oil leaks onto hot surfaces or within the exhaust gas system.

Class survey

Class surveyors typically focus on verifying the overall condition, maintenance history, and safety aspects. They will check for: 1. Up-to-date maintenance records and logbook entries confirming adherence to service schedules. 2. General cleanliness, absence of oil/exhaust gas leaks, and proper insulation of hot surfaces. 3. Functionality of safety devices such as overspeed trip and pressure relief valves (if fitted). 4. Secure mounting of the turbocharger and associated piping. 5. Visual inspection for any signs of damage, excessive vibration (if running), or unusual noises. 6. Availability of Type Approval certificates and relevant service reports.

Estimated lifetime: 16,000 - 24,000 running hours before major overhaul of rotating assembly (bearings, seals, cleaning, balancing). Total unit lifetime can exceed 72,000 hours with proper maintenance.