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Q12. With reference to double-bottom fuel tanks:

(a) explain why weighted cocks are fitted to the tank-sounding pipes. (2)

(b) explain the purpose of air pipes. (2)

(c) state the design features incorporated on air pipe vents with respect to EACH of the following:

(i) heavy weather; (2)

(ii) fire; (2)

(iii) bunkering. (2)