DieselShip's Online Content Library

Q4. With reference to auxiliary boilers

(a) Briefly describe the maintenance procedures for oil burning equipment. (5)

(b) Explain the need for and the use of soot blowers. (5)

(c) Describe how a boiler should be taken out of service. (6)

Q8. With reference to the exhaust gas boiler of your ship explain the following:

A. Composition and reasons of soot deposits.

B. Various stages of soot fire leading to high temperature fire.

C. Procedure to be followed for firefighting under different stages of soot fire.

D. Actions required prior to dry running of an exhaust gas boiler.

Q5. A. Describe THREE different patterns of tube used in exhaust gas boilers. (4)

B. Give reasons why a tube is condemned. (4)

C. Describe how it is replaced by a spare tube. (4)

D. Suggest with reasons the possible consequences of allowing an exhaust gas boiler to run dry during full power operation of the main engine. (4)

Q8. With reference to main boiler super heater arrangements:

A. Compare the advantages and disadvantages of contra flow with parallel flow design.

B. Describe how the element tube banks are supported yet allow for expansion.

C. Describe how boiler carryover affects super heater effectiveness and condition.

Q9. With reference to a waste heat boiler/economiser:

a. Write a procedure for the cleaning the gas side of a waste heat boiler/economiser when the associated main engine is:

(i) running; (5)

(ii) stopped. (5)

b. Write a procedure for operation of the main engine when the associated waste heat boiler/economiser cannot be operated due to tube failure. (6)

Q1. 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. (8)

b) Discuss the preventive measures and maintenance practices that can be implemented to mitigate corrosion and ensure the efficiency of the auxiliary boiler. (8)

Q5. Why should the exclusion of oxygen from the boiler water of a water-tube boiler be regarded as important? Describe measures, both mechanical and chemical, that are intended to achieve oxygen free boiler water under working conditions. What precautions would you take when laying up a water-tube boiler for (a) a considerable period, (b) a few days? (16)

Q4. a) Explain the construction, working and adjustment procedure of a high-lift safety valve used on marine boilers. (8)

b) Describe the procedure, purpose and safety precautions involved in conducting an accumulation of pressure test on a marine boiler. (8)

Q6. (a) Draw a diagrammatic sketch of auxiliary boiler on your ship, labelling all the mountings provided (8)

(b) Describe function of each mounting in brief (8)

Q8. Where a waste heat boiler is subject to persistent leakage at the tube/tube plate connection, state with reasons:

(a) The possible causes of such leakage (6)

(b) The effects of this leakage (5)

(c) Methods of effecting a permanent repair. (5)

Q7. (a) What do you understand by the term 'Boiler' and What is its function on board? (4)

(b) List out the uses of steam on board (4)

(c) Name the types of boilers generally used on ship and explain the differences (4)

(d) State the advantages of water tube boilers over smoke tube boiler (4)