Class 4 (4th Engineer) MEKM 📅 Oct 2025

Exam Question

Make a diagrammatic sketch of a jacket cooling water system as applied to a two stroke main engine. Indicate the temperature and pressure in the system. Describe in particular the flow of water from entry to the engine to outlet from the engine and sketch the more important joints in the system (16)

Reference Answer

### **1. System Overview and Purpose**
The Jacket Cooling Water (JCW) system, also known as the High Temperature (HT) cooling system, is a closed-loop fresh water circuit designed to maintain the optimal operating temperatures of the main engine's critical components. Its primary function is to remove excess heat generated during combustion, preventing thermal overstressing of materials.
**Key Objectives:**
* **Thermal Stress Control:** Prevents excessive thermal stresses in the cylinder liners, cylinder covers, and piston crowns by maintaining a controlled temperature gradient. This minimizes the risk of micro-cracking and catastrophic failure.

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