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Q1. With reference to membrane tanks for the carriage of liquefied gas at very low temperatures. A. Describe with a sketch one method of building up the insulation; B. State which alloy is used for the membrane and the reason; C. Describe with the aid of a sketch, how the tanks are located and supported. i) Longitudinally; ii) Transversely

Q2. (a) Define critical temperature and boiling point and hence show how some liquefied gases may be transported fully pressurized, whilst others need to be carried fully refrigerated.

(b) State the basic differences in construction of fully pressurized and fully refrigerated systems for the carriage of liquefied gas at sea.

(c) Compare the membrane tank and independent tank systems of construction.

Q2. a) What are the basic type of cargo tanks utilized on board gas carriers? (6)

b) Sketch and describe a membrane type tank for a LNG tanker. (10)

Q4. With reference to membrane tanks for the carriage of liquefied gas at very low temperatures.

a) Describe with a sketch one method of building up the insulation. (6)

b) State which alloy is used for the membrane and the reason. (6)

c) Explain why a secondary barrier is installed. (4)

i) Longitudinally

ii) Transversely