Q5. With regard to keeping the gas side of boilers in good condition,
Discuss EACH of the following.
1. The mechanism of combustion, stating the factors which are important to good combustion (6)
2. Oil fuel treatment (5)
3. Soot removal equipment (5)
Q5. (a) State why the presence of oil in boiler water is considered serious. (4)
(b) Suggest likely sources of oil contamination. (4)
(c) Describe how the source is traced. (4)
(d) Describe how the whole steam plant is restored to oil free conditions. (4)
Q1. (a) With reference to auxiliary boiler safety valves: (10)
(i) Describe, with the aid of a sketch, the safety valve for an auxiliary boiler.
(ii) Identify, with reasons, the parts that particularly require close attention during
overhaul.
(b) Describe the duties of a watch keeper with respect to a running boiler. (6)
Q2. (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)
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