Turbocharger · Turbochargers
The ABB A175‑L (frame 175‑L37) is a high‑capacity turbocharger designed for two‑stroke slow‑speed main engines, delivering up to 30 000 kW of boost pressure to improve fuel efficiency and power output.
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| Compressor water washing | 250 - 500 running hours (or as indicated by performance drop) |
|---|---|
| Turbine water washing | 500 - 1000 running hours (or as indicated by performance drop) |
| Bearing inspection/replacement | 8,000 - 16,000 running hours (depending on condition and type, e.g., plain bearings) |
| Minor overhaul (inspection of rotor, cleaning, replacement of seals/gaskets) | 16,000 - 24,000 running hours or 3-5 years |
| Major overhaul (full disassembly, inspection, balancing, replacement of wear parts like nozzle ring, diffuser) | 32,000 - 48,000 running hours or 5-8 years |
| Complete overhaul/factory service (rotor shaft inspection, casing integrity) | 64,000 - 96,000 running hours or 10-15 years |
| Bearing axial play | New: 0.15 - 0.30 mm; Max allowed: 0.40 - 0.50 mm (consult specific manual for A175-L) |
|---|---|
| Bearing radial play | New: 0.20 - 0.40 mm; Max allowed: 0.60 - 0.80 mm (consult specific manual for A175-L) |
| Compressor/Turbine blade erosion | Any visible cracks, significant material loss (e.g., >10% chord length), or deep pitting that could affect balance or strength. |
| Nozzle ring deformation/cracks | Any visible cracks, significant warping, or blockage of gas passages that affects flow distribution. |
| Casing cracks | Any visible crack in pressure-retaining parts (gas casing, bearing housing) is critical and requires immediate attention. |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors will typically focus on the overall condition and cleanliness of the turbocharger, verifying that it is free from excessive vibration, oil leaks, and exhaust gas leaks. They will check the integrity of the exhaust gas casing and insulation. If the turbocharger is opened for maintenance, bearing clearances (axial and radial play) will be measured and recorded. The functionality of safety devices, particularly the overspeed trip mechanism and associated alarms, will be confirmed. Maintenance records, running hours, and performance logs (boost pressure, exhaust temperatures) will be reviewed to ensure adherence to manufacturer's recommendations and good operating practice. Any signs of surging or unstable operation will be investigated.
Estimated lifetime: 100,000 - 150,000 running hours for major components (rotor shaft, main casings) with regular maintenance and replacement of wear parts.
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