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Mitsubishi MET

SR 83SR

Turbocharger · Turbochargers

Technical data from manufacturer or class sources · not yet verified by a person​‍​‍⁠‍⁠‍​​‍​‍⁠‌⁠‍‌‍​

A high‑capacity turbocharger designed for two‑stroke low‑speed marine diesel engines up to 55 MW, providing forced induction to meet IMO Tier II emission limits.

Specifications

Technical data.reference — unverified

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Frame Size83SR
Power max (kW)55000
Inspection

Inspector Detail

Common issues

  • Bearing wear and failure (thrust and radial bearings), often indicated by increased vibration or abnormal noise.
  • Compressor fouling due to dirty intake air or oil leakage from the sealing air system, leading to reduced efficiency and surging.
  • Turbine fouling or erosion from poor fuel combustion, high exhaust gas temperatures, or abrasive particles, causing reduced power and increased exhaust back pressure.
  • Oil leakage from the bearing casing, often through the sealing air system or worn oil seals, posing fire risk and oil consumption issues.
  • Rotor imbalance leading to excessive vibration, potentially damaging bearings and other components.
  • Cracks in turbine casing or exhaust gas manifold due to thermal stress or material fatigue.
  • Nozzle ring damage or deformation, impacting turbine efficiency and exhaust gas flow.
  • Overspeed trip system malfunction or failure to activate, leading to catastrophic turbocharger disintegration.

Inspection checklist

  • Check turbocharger casing for any signs of oil leakage, exhaust gas leakage (soot marks), or cracks, especially around hot sections and mounting points.
  • Monitor turbocharger vibration levels using onboard monitoring systems or portable vibrometers; compare against baseline and alarm limits.
  • Verify lubricating oil pressure and temperature at the turbocharger inlet/outlet are within manufacturer's specified ranges.
  • Inspect compressor impeller and diffuser for fouling, erosion, or foreign object damage (FOD) by opening the air filter casing (if safely possible or during scheduled maintenance).
  • Inspect turbine blades and nozzle ring for fouling, erosion, or damage (requires opening turbine casing during maintenance, but external signs like high exhaust temp spread can indicate issues).
  • Check condition and security of all mounting bolts, pipe connections (oil, air, water), and expansion joints.
  • Confirm proper operation and cleanliness of the compressor intake filter system.
  • Review turbocharger performance parameters (RPM, boost pressure, exhaust gas temperatures before/after turbine) against engine load and design values.
  • Verify the functionality of the overspeed trip device (check records of last test and ensure it's armed).

Service intervals

Compressor/Turbine Water WashingEvery 250-500 running hours, or as indicated by performance degradation.
Compressor Dry Cleaning (if applicable)Every 1,000-2,000 running hours.
Bearing Inspection/Replacement12,000 - 16,000 running hours (depending on bearing type and condition monitoring).
Minor Overhaul (inspection of rotor, bearings, seals, nozzle ring)16,000 - 24,000 running hours.
Major Overhaul (complete disassembly, inspection, replacement of worn parts, balancing)32,000 - 48,000 running hours.

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Axial Rotor ClearanceNew: 0.15 - 0.30 mm. Wear Limit: +0.10 to +0.15 mm over new, or as per manufacturer's manual (e.g., 0.40 - 0.45 mm max).
Radial Rotor ClearanceNew: 0.10 - 0.20 mm. Wear Limit: +0.05 to +0.10 mm over new, or as per manufacturer's manual (e.g., 0.25 - 0.30 mm max).
Bearing Surface ConditionNo scoring, pitting, excessive discoloration, or material loss. Any visible damage warrants replacement.
Turbine/Compressor Blade Erosion/FoulingVisual assessment; significant material loss (e.g., >10% chord length) or heavy, unremovable fouling affecting performance is unacceptable.
Casing CracksAny visible crack in pressure-retaining or structural components is unacceptable and requires repair or replacement.

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

Critical spares

  • Complete bearing cartridge assembly (thrust and radial bearings)
  • Set of oil seals and O-rings for bearing casing
  • Nozzle ring segments or complete nozzle ring
  • Impeller nut (rotor securing nut)
  • Gasket sets for turbine and compressor casings
  • Air filter elements (if applicable to the intake system)
  • Overspeed trip sensor or mechanism components

Safety

  • Catastrophic failure due to overspeed, leading to projectile hazards from disintegrating components.
  • High surface temperatures on turbine casing and exhaust piping, posing severe burn risks.
  • High noise levels requiring hearing protection during operation and inspection.
  • Potential for exhaust gas leaks, leading to asphyxiation in enclosed spaces or fire risk.
  • Oil mist leakage from bearing casing, creating a fire and explosion hazard in the engine room.

Class survey

A class surveyor will typically review the vessel's Planned Maintenance System (PMS) records for the turbocharger, including records of bearing inspections, overhauls, cleaning, and overspeed trip tests. They will physically inspect the turbocharger for external signs of leakage (oil, exhaust gas), excessive vibration, and general condition. Performance logs (boost pressure, RPM, exhaust temperatures) will be checked for consistency and deviations. The availability of critical spare parts onboard will be verified. Compliance with SOLAS requirements regarding exhaust gas containment and fire safety will also be assessed.

Estimated lifetime: 32,000 - 48,000 hours before major overhaul, with proper maintenance and component replacement, the unit can exceed 100,000 hours total operational life.

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