Q4. a) What are the various types of corrosion that can occur in auxiliary boilers on ships? Describe each type, including its causes, symptoms, and potential consequences.
b) Discuss the preventive measures and maintenance practices that can be implemented to mitigate corrosion and ensure the efficiency of the auxiliary boiler.
Q5. Sketch and explain the construction of a feed Check Valve. Why is it known as double shut off arrangement. (16)
Q6) (a) Sketch an auxiliary boiler ‘blow down’ valve. Explain how it differs from its shipside counterpart (10)
(b) Describe the sequence of ‘blow down’ procedure (6)
Q5) The auxiliary boiler of a ship periodically needs feed water, and the rate of feed is gradually increasing every day, without an increase in demand. Suggest some causes for such a happening. (16)
Q5) (a) Describe the effects of taking fresh water from the shore as feedwater for auxiliary boilers. (5)
(b) Describe the measures taken to reduce these effects. (5)
(c) What is the purpose of deaerator in the boiler feed water system? How is the deaeration achieved? (6)
Q1. Oil traces have been found in the condensate tank of an auxiliary boiler:
(a) Describe the procedure to trace the source of contamination (8)
(b) List the contamination with reasons for its occurrence and the precaution to be taken to ensure safety of the boiler (8)
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