Q2. Sketch a high-lift safety-valve lid and seat detailing their special features. Describe how such a valve is overhauled and any clearance that should be measured and noted. (16)
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 regards to main transmission shaft flange coupling arrangements:
A. Sketch a hollow type coupling bolt and the hydraulic head/nut and loading rod which are used to fit it.
B. Describe how the bolt is fitted.
C. State the advantage of the hollow coupling bolt as compared to the traditional type of coupling bolt.
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