DieselShip's Online Content Library

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)

Q5) (a) In the context of auxiliary boiler. Explain what do you understand by the term ‘foaming’. List the measures you would consider to prevent it? Is it different from ‘priming’ in the auxiliary boiler context? (6)

(b) Explain any one of the following with a sketch. (6)

(i) Composite boiler

(ii) Exhaust gas economiser

(c) What is the significance of ‘de-aeration’ of the boiler water? How is it achieved and what are the effects if ignored? (4)

Q8. A Rating has been seriously injured by a "blow back" from the oil fired auxiliary boiler. As Second engineer, make a full report to Head office explaining the circumstances of the incident and the precautionary measures now taken to reduce the possibility of a similar occurrence in the future.

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)