Class 1 (Chief Engineer) Engineering Management 📅 Jun 2024

Exam Question

With the introduction of the new generation of super-long stroke engines and changed process parameters triggered by environmental compliance rules, 'cold corrosion' of cylinder liners has grown to become a major issue for the latest generation of two-stroke engines. Discuss the causes and mitigation measures, stressing on the following: (16)

(a) Increased jacket cooling water temperatures systems

(b) New cylinder liner designs

Reference Answer

### Cold Corrosion in Modern Two-Stroke Marine Engines
Cold corrosion is an accelerated electrochemical wastage of cylinder liner material caused by the condensation of sulfuric acid (H₂SO₄) on liner surfaces. This issue has become prominent in new-generation super-long stroke engines due to design changes and operational profiles mandated by environmental regulations (EEDI, IMO Tier III).
#### Fundamental Causes
1. **Chemical Reaction**: Sulfur (S) in the fuel combusts to form sulfur dioxide (SO₂) and subsequently sulfur trioxide (SO₃).

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