Turbocharger · Turbochargers
On board marine vessels, especially those powered by large marine diesel engines, the exhaust gas and charge air systems play a critical role in engine performance and efficiency. These systems often include equipment like the AT20, designed to manage and optimize the flow of exhaust gas and charge air. The AT20 is tailored for use with 4-stroke marine diesel engines, ensuring optimal operation and performance. Common issues that can arise with this equipment include bearing wear, compressor and turbine deposits, and rotor imbalance, which may affect its operational reliability and efficiency. To address these issues, it is crucial to verify the specific compressor and turbine specifications before sourcing repair parts for the AT20. Regular servicing as outlined in the manufacturer's manual and in compliance with classification society requirements is essential. Additionally, annual inspections during class surveys are recommended to maintain the equipment's operational readiness and to adhere to regulatory standards. Stocking spare parts as specified by the manufacturer ensures that maintenance can be carried out efficiently and effectively.
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What our service work and the manufacturer documentation say about keeping this model running.
Servicing per the manufacturer's manual and classification society requirements. Annual inspection at class survey. Stock spare parts as specified by the manufacturer.
| Annual Inspection (Class Survey) | As per Class requirements, typically annually. |
|---|---|
| Compressor Cleaning (Dry/Wet) | 1,000 - 2,000 running hours, or as indicated by performance drop. |
| Turbine Cleaning (Water Wash) | 500 - 1,000 running hours (if fitted and recommended by IHI). |
| Bearing Inspection/Replacement | 4,000 - 8,000 running hours, depending on engine type and operating conditions. |
| Major Overhaul (including rotor balancing) | 8,000 - 16,000 running hours, or as per manufacturer's manual. |
| 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 - 0.15 mm |
| Rotor Radial Play (Service Limit) | 0.25 - 0.30 mm |
| Compressor/Turbine Blade Tip Clearance | Visual inspection for rubbing marks on casing is key; exact values vary, but any contact is unacceptable. |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically review maintenance records (running hours, previous inspections, repairs), verify turbocharger performance parameters (boost pressure, exhaust gas temperatures), conduct an external visual inspection for leaks (oil, exhaust gas), check the security of mounting, and confirm the functionality of safety devices (e.g., overspeed trip, alarm functions). If the turbocharger has been opened for maintenance, they will verify bearing clearances and component condition against manufacturer specifications. Availability of critical spare parts as per class requirements is also checked.
Estimated lifetime: 8,000 - 16,000 hours before major overhaul; 50,000+ hours total with diligent maintenance and component replacement.
Verify compressor and turbine specification before sourcing AT20 repair parts.
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