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Class 4 (4th Engineer) SSEP 📅 Apr 2025

Exam Question

(a) What are the causes of an uptake fire? (6) 

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

(c) How boiler uptake fire is controlled? Why the use of soot blowers is prohibited? (8) 

Reference Answer

### (a) Causes of an Uptake Fire (6 Marks)
An uptake fire is the combustion of accumulated soot and unburnt hydrocarbons in the boiler's exhaust gas passages, including the economizer, air heater, and funnel. The primary conditions for such a fire are the presence of fuel (soot), an ignition source, and oxygen (air). The specific causes are as follows:
1. **Accumulation of Combustible Deposits (Fuel):**
* **Incomplete Combustion:** This is the root cause of soot formation. It occurs due to:

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