Class 4 (4th Engineer) MEKG 📅 Oct 2024

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 plafform, 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 Actions for Oil Mist Detector (OMD) Alarm and Hot Crankcase Door (10 Marks)
As the Watch-keeping Engineer on a vessel with UMS certification and bridge control, observing an OMD alarm coupled with a physically warm crankcase door indicates a critical situation requiring immediate, calm, and systematic action to prevent a crankcase explosion. The following preemptive steps must be taken:
1. **Acknowledge and Announce:** Immediately acknowledge the alarm in the Engine Control Room (ECR). Inform the Bridge about the Main Engine OMD alarm and the developing situation. Concurrently, inform the Chief Engineer and the Second Engineer.
2. **Reduce Engine Load:** In a modern UMS vessel, the engine will typically slow down automatically upon an OMD high alarm. If this does not occur, immediately request the Bridge to reduce engine load to 'Slow Ahead' or 'Dead Slow Ahead'.

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