Class 4 (4th Engineer) MEKG 📅 Apr 2025

Exam Question

(a) Whilst on 'seawatch' you observe that the Oil Mist detector (OMD) in the engine room has triggered an alarm and in feeling the crankcase doors on the bottom platform you find that the unit in question feels warmer than the rest. What preemptive action will you take as Watch-keeper to bring the situation under control. (10)

(b) Draw a simple line diagram of a "OMD" and explain it's working. (6)

Reference Answer

### (a) Preemptive Action for OMD Alarm (10 Marks)
As the Watch-keeping Engineer, observing an Oil Mist Detector (OMD) alarm accompanied by a warm crankcase door indicates a high probability of an overheating component (hotspot) within that specific crankcase unit. Immediate, systematic, and safety-conscious actions are paramount to prevent a crankcase explosion. The following preemptive actions must be taken:
**1. Immediate Engine Control and Load Reduction:**
* **Acknowledge Alarm:** Immediately acknowledge the alarm on the Engine Control Room (ECR) panel.

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