Q8: Boiler automatic combustion control has failed during operation of boiler. Explain: A. Procedures to operate boiler in emergency. B. Action plan to investigate, rectify and bring system to normal boiler operation.
Q9. Describe how an auxiliary boiler would be blown down and opened up for inspection. State the Precautions which should be taken during the inspection and when boxing up the boiler for service. Which parts require particularly close attention when opened up and describe the procedure for the setting of safety valves.
Q9. With reference to a water tube boiler :
a) State the indication that a tube is leaking.
(i) When the amount of leakage is small.
(ii) When the amount of leakage is large.
b) If the failed tube is located within the tube bank.
(i) How can it be identified.
(ii) Describe immediate actions and temporary repairs done.
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)
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)
Q9. Make a diagrammatic sketch of an exhaust gas boiler. Describe its construction and explain how it is maintained in an efficient condition. (16)
Q7. i) Sketch and describe a composite boiler and explain its working principle. (12)
ii) What do you understand by the term 'Heat Recovery'? Briefly explain as to how it contributes to increasing plant efficiency? (4)
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