Class 4 (4th Engineer) MEP 📅 Jun 2025

Exam Question

(a) How is fuel (HFO) for a marine diesel engine (main engine) being delivered from a fuel oil storage tank up to the combustion chamber? Explain with a line diagram. (10)

(b) What is the significance of the following:

(i) Heating arrangement with temperature control. (3)

(ii) Prevention of air lock in the system. (3)

Reference Answer

### (a) Fuel (HFO) Delivery System from Storage Tank to Combustion Chamber
The delivery of Heavy Fuel Oil (HFO) from the storage tanks to the combustion chamber of a marine diesel engine involves a complex and meticulously managed system designed to ensure the fuel is clean, at the correct temperature, and delivered at the required pressure and timing for efficient combustion. This system is crucial for the reliable operation of the main engine.
The typical HFO delivery system comprises the following key components and stages:
1. **Fuel Oil Storage (Bunker) Tanks:**

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