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Q8. Accidents have occurred due to premature or accidental release of CO₂ into the machinery spaces.

(a) State the safety procedures that the Chief Engineer Officer should adopt with respect to maintenance being carried out on the system by shore contractors. (3)

(b) Explain why the Chief Engineer and ships staff should still have to check on work carried out by shore contractors. (2)

(c) State how the liquid levels in the CO2 bottles may be checked in situ and how often this test should be carried out. (2)

(d) Explain why ship's general service air should not be used for blowing through and testing CO2 operating lines and suggest a suitable alternative. (3)