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Q2. A. Describe the procedure to be adopted for the inspection of a safety valve fitted to an exhaust gas fired auxiliary boiler stating, with reasons, which parts should receive particularly close attention.

B. Describe the procedure for the setting of safety valves of exhaust gas operated auxiliary boilers;

C. Explain the required action a watch-keeping engineer should take after the setting of safety valves as in (B)

Q2. The pipe work of the sea water circulation system for a passenger ship has to be completely renewed. The company contracted for the work has no previous experience of marine installation. You as the Second engineer have been requested to write the specification for manufacture and installation of the steel pipe; outline your proposal for manufacture of the pipe; State the necessary requirements for approval.

Q2. Discuss the advantages and disadvantages of adopting the following for maintenance of main and auxiliary engines - A. Planned maintenance; B. Condition monitoring; C. Periodic replacement of components.

Q2. With reference to the carriage and pumping of liquefied gas cargo:

A. Sketch a suitable pumping system labelling the component parts;

B. State;

i) Why submerged hydraulically driven pumps are not used;

ii) How overheating of pump drive shaft bearings is avoided;

C. State, how the risk of fire and explosion in cargo tanks is obviated both in the loaded and discharged condition.

Q6. With reference to electro-hydraulic steering gears:

A. Explain in terms of control parlance, the function of the “Hunting gear”;

B. Explain the consequences if the standby pumping unit is motored;

C. State TWO methods employed to prevent the standby hydraulic pump being motored by the operating unit.

Q6. Briefly explain the term fatigue and explain how fatigue failure occur; State the difference between high stress / low cycle and low stress / high cycle; State how defect in metal can influence the expected safe life of a component; State how fuel timing and cylinder power balance can influence the possibility of fatigue crack.

Q7. Describe the term volumetric efficiency as related to air compressor; Describe the effect of the following faults in multi stage reciprocating air compressor; Inter stage cooler starved of cooling water; Worn crank shaft bearing; Broken or worn scarper ring; Suggest a failsafe arrangement in the event of inter stage cooler water loss.

Q5. With reference to Boiler water tests carried out onboard:

A. Discuss the possible reasons for the following changes in boiler water test results, and state what actions should be taken in each case;

1. Reduction in total dissolved solids and chemical reserves.

2. Reduction in phosphate reserve, with increase in chlorides and total dissolved solids;

3. Reduction in alkalinity reserve only.

4. Increase in oxygen levels only.

B. State why the complete results of boiler water tests are logged or entered into a data retrieval system rather than a note being made of any particular result which may be outside set limits.

Q2. Describe how you, as a Second Engineer, would prepare an auxiliary boiler for survey by a classification society.