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.
Q8. With respect to centrifuges.
(a) Explain the reasons which shall cause a purifier to overflow (6)
(b) What are reasons that induces vibration in a purifier" (4)
(c) Explain the process of desludging? Why is the purifier amperage an important parameter for the operator? (6)
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. (a) What is Accumulation of pressure test for Boiler and what is its purpose? (6)
(b) Describe the detailed procedure for an Accumulation of pressure test. (10)
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. (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)
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)
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)
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)
Q4. Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, suggest with sketches, methods of effecting a permanent repair. (16)
Q2. Make a diagrammatic sketch of an exhaust gas boiler. Describe its construction and explain how it is maintained in an efficient condition (16)
Q7. With reference to auxiliary boiler safety valves state with reasons:
(a) What clearances need checking when lapping valves to seats (5)
(b) Why the drain must be clear (5)
(c) Why opening gear should be kept in good working order at all times (6)
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