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Kompressorenbau Bannewitz

ST3

Turbocharger · Turbochargers

Technical data from manufacturer or class sources · not yet verified by a person​​‍‌​​‍‌​​‍‌⁠‍‌​⁠⁠​‌
Exhaust gas / charge airMedium

Crew and engineers on board vessels depend on reliable exhaust gas and charge air systems to ensure optimal performance of diesel and gas engines, particularly in maintaining efficiency and compliance with stringent operational standards. Kompressorenbau Bannewitz’s ST3 model is a critical component in this context, designed specifically for 4-stroke engines. The ST3 ensures efficient operation by managing the flow of exhaust gas and charge air, which is essential for the overall performance and longevity of the engine. Common issues that can arise with the ST3 include compressor fouling, turbine fouling, bearing wear, and seal leakage. These problems, if left unaddressed, can significantly impact the system’s efficiency and reliability. To mitigate these risks, it is crucial to follow the manufacturer's manual and classification society requirements for servicing. Annual inspections are a mandatory part of class surveys, ensuring that the equipment remains in top condition. When it comes to spare parts, legacy ST-series components require precise identification of the frame and execution to ensure compatibility. This attention to detail is vital for maintaining the integrity and performance of the system. Stocking the specified spare parts as recommended by the manufacturer is also essential for minimizing downtime and ensuring that repairs can be carried out efficiently when needed.

Specifications

Technical data.

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Engine Type4-stroke
Service

Service notes.

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.

Inspection

Common failures & inspection points

Inspection

Inspector Detail

Common issues

  • Compressor fouling (due to dirty intake air or oil carry-over)
  • Turbine fouling (due to poor fuel combustion or exhaust gas quality)
  • Bearing wear (journal and thrust bearings, leading to excessive rotor play)
  • Oil seal leakage (leading to oil in compressor/turbine side or exhaust gas into bearing housing)
  • Rotor imbalance and vibration (often a consequence of fouling or bearing wear)
  • Nozzle ring and diffuser damage/erosion (affecting turbocharger efficiency)
  • Casing cracks (especially on the hot turbine casing due to thermal stress)
  • Foreign object damage (FOD) to compressor or turbine blades

Inspection checklist

  • Check for external oil and exhaust gas leakages from all casings and connections.
  • Measure rotor axial and radial play (free play) to assess bearing condition. Compare with manufacturer's limits.
  • Inspect compressor wheel for fouling, erosion, blade damage, and tip clearance.
  • Inspect turbine wheel for fouling, erosion, cracks, and foreign object damage (FOD).
  • Examine nozzle ring and diffuser for cracks, deformation, and carbon build-up.
  • Verify security of mounting bolts and integrity of support structures.
  • Check condition of air filter elements (if integrated or upstream) and air intake ducting.
  • Inspect lubricating oil supply and drain lines for integrity and proper flow.
  • Check bearing housing ventilation and drain arrangements for blockages.
  • Listen for unusual noises or vibrations during operation.

Service intervals

Minor Inspection (visual, cleaning)2,000 - 4,000 hours
Intermediate Inspection (bearing check, cleaning)8,000 - 12,000 hours
Major Overhaul (full disassembly, bearing replacement, balancing)16,000 - 24,000 hours or 3-5 years
Bearing Replacement16,000 - 24,000 hours

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

Typical wear limits

Rotor Axial Play (new)0.10 - 0.20 mm
Rotor Axial Play (max allowed)0.30 - 0.40 mm
Rotor Radial Play (new)0.20 - 0.35 mm
Rotor Radial Play (max allowed)0.50 - 0.65 mm
Compressor/Turbine Blade Tip ClearanceManufacturer specific, typically 0.3 - 0.6 mm (any contact or significant reduction is critical)
Nozzle Ring Deformation/CracksAny visible cracks or significant deformation affecting gas flow is unacceptable

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

Critical spares

  • Complete bearing cartridge / Bearing set (journal and thrust bearings)
  • Oil seal rings (compressor and turbine side)
  • Gasket set (for casings, oil lines, air ducts)
  • Air filter elements (if applicable to intake system)
  • Nozzle ring segments (if modular design)
  • Special tools for disassembly and assembly (e.g., rotor locking tool, lifting gear)

Safety

  • High surface temperatures (exhaust gas casing, turbine housing) - risk of burns.
  • High rotational speeds (up to 100,000+ rpm) - risk of uncontained failure if rotor integrity is compromised.
  • Pressurized air and exhaust gases - risk of injury from sudden release.
  • Hot lubricating oil - risk of burns and fire hazard.
  • High noise levels during operation - risk of hearing damage.

Class survey

Class surveyors will typically review the turbocharger's maintenance records, running hours, and previous inspection reports. They will visually inspect the external condition for leaks, damage, and security of mounting. Measurement of rotor axial and radial play is a common requirement. Depending on running hours and condition, an internal inspection of the compressor and/or turbine side may be requested. Verification of compliance with manufacturer's service schedule and classification society requirements is key. Safety devices like overspeed trip mechanisms and alarm functions may also be checked.

Estimated lifetime: 80,000 - 100,000 hours (with regular maintenance and scheduled overhauls)

Spares

Replacement Parts

Spare parts notes

Legacy ST-series parts require exact frame and execution identification.

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