Class 4 (4th Engineer) SSEP 📅 Feb 2023

Exam Question

(a) Explain mechanism for initiation of uptake fire on ship. (6)

(b) State the conditions under which light soot fire, intensifies to a high temperature fire in boiler uptake, what temperature are produced in each case. (6)

Reference Answer

### (a) Mechanism for Initiation of an Uptake Fire (6 Marks)
An uptake fire is initiated through a sequence of events involving the accumulation of combustible deposits and an ignition source. The mechanism is as follows:
1. **Formation of Deposits**: Incomplete combustion of fuel oil in the boiler furnace generates fine carbon particles (soot) and unburnt hydrocarbons. These are carried away from the furnace along with the hot exhaust gases.
2. **Accumulation on Surfaces**: These particles and vapours travel through the exhaust gas pathway. They deposit on the heat exchange surfaces within the uptake, primarily on:

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