HPR5000

Common issues

• Compressor fouling (reduced efficiency, surge risk)
• Turbine nozzle ring fouling (reduced power, increased exhaust back pressure)
• Bearing wear (increased radial/axial play, vibration, oil leakage)
• Rotor vibration (imbalance, bearing damage, potential for catastrophic failure)
• Oil leakage from bearing housings or oil supply/drain lines
• Air filter clogging (reduced compressor efficiency, increased pressure drop)
• Exhaust gas leaks from turbine casing or gas inlet/outlet connections
• Surge (audible pulsing, rapid pressure fluctuations, can damage compressor)

Inspection checklist

• Check bearing radial and axial play (manual check if accessible, or monitor vibration trends).
• Inspect compressor impeller and casing for fouling, erosion, or foreign object damage (FOD).
• Inspect turbine nozzle ring and blades for fouling, erosion, cracks, or burning.
• Verify oil supply pressure and temperature, and check for any oil leaks around bearing housings or piping.
• Examine air filter condition; ensure it is clean and free from damage or blockage.
• Check all casing bolts and connections for tightness and signs of exhaust gas or air leakage.
• Monitor turbocharger speed, exhaust gas temperatures (in/out), and boost pressure for deviations from normal operating parameters.
• Listen for unusual noises (whining, grinding, surging) indicating bearing wear or rotor imbalance.
• Inspect the turbine wash system and drainage for proper function and cleanliness.
• Verify functionality of overspeed trip and speed sensor.

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/bushes)
• O-rings, gaskets, and sealing rings for bearing housings and casings
• Oil filter elements (if integral to TC oil system)
• Air filter elements (if applicable to TC intake)
• Nozzle ring segments (if design allows for individual replacement)
• Rotor balancing weights (for workshop use during overhaul)
• Speed sensor (critical for engine control and safety)

Safety

• Hot surfaces: Exhaust gas casing and turbine outlet operate at very high temperatures (300-600°C+). Risk of severe burns.
• High-speed rotating machinery: Rotor operates at tens of thousands of RPM. Risk of catastrophic rotor failure if severely unbalanced or damaged, leading to projectile hazards.
• Noise levels: High noise output requires hearing protection in the vicinity.
• Pressurized systems: Compressor discharge air and exhaust gas are under pressure. Risk of injury from sudden release or leaks.
• Oil mist/leakage: Leaking oil onto hot surfaces poses a significant fire hazard.

Class survey

The class surveyor will typically review the vessel's maintenance records for the turbocharger, including service reports, logbook entries for running hours, and any reported defects or repairs. They will visually inspect the turbocharger for external leaks, signs of overheating, excessive vibration, and general condition. If an intermediate or major inspection is due or has recently been performed, the surveyor may request to witness bearing play checks or review internal inspection reports. Verification of safety devices like the overspeed trip and proper functioning of monitoring systems (temperatures, pressures, speeds) are also key points. Compliance with KBB's manufacturer's manual and classification society rules for maintenance is paramount.