Turbocharger · Turbochargers
IHI Marine AT AT-14 — AT, 5000 kW max.
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| Routine operational checks (noise, vibration, temperatures, pressures) | Daily/Weekly |
|---|---|
| Compressor side cleaning (dry or wet washing) | 1,000 - 2,000 running hours (or as indicated by performance drop) |
| Turbine side cleaning (water washing) | 500 - 1,000 running hours (depending on fuel quality and engine load) |
| Bearing inspection and replacement (cartridge type) | 8,000 - 12,000 running hours |
| Major overhaul (rotor balancing, casing inspection, nozzle ring/diffuser inspection/replacement) | 16,000 - 24,000 running hours |
| Rotor axial play (new) | 0.10 - 0.20 mm |
|---|---|
| Rotor axial play (service limit) | 0.30 - 0.40 mm |
| Rotor radial play (new) | 0.05 - 0.10 mm |
| Rotor radial play (service limit) | 0.15 - 0.20 mm |
| Compressor/Turbine blade tip clearance | Specific to model, typically 0.3 - 0.6 mm (check for rub marks indicating excessive play or imbalance) |
| Bearing shell thickness | Refer to manufacturer's manual for specific minimum thickness; typically, wear beyond 10-15% of original thickness is critical. |
| Nozzle ring opening | Check for carbon build-up reducing effective area; distortion or cracks are critical. |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically verify the turbocharger's maintenance records, including dates of bearing replacements, major overhauls, and routine cleaning. They will conduct an external visual inspection for oil leaks, cooling water leaks, cracks in casings or exhaust ducts, proper insulation, and secure mounting. During engine operation, they will observe for abnormal noise, vibration, and verify operational parameters like boost pressure and exhaust gas temperatures. If the turbocharger has been opened for maintenance, the surveyor may request to inspect internal components such as bearings, rotor, nozzle ring, and diffuser for condition and adherence to wear limits. They will also confirm the integrity of the air intake filter system and exhaust gas system.
Estimated lifetime: 16,000 - 24,000 running hours before major overhaul; total design life of main casings and structural components can exceed 80,000 - 100,000 hours with proper maintenance and component replacement.
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