Q6. Petroleum vapours are a dangerous substance and when mixed with air can be ignited. With this in mind, briefly describe,
a) An explosimeter or combustion gas indicator which can be used to check the atmosphere of a tank or pump room. (10)
b) Describe the explosimeter and its operation. (10)
Q8. (a) The Centrifugal ballast pump in the engine room also doubles as a fire pump in your ship. What specific precautions would you take to change over the ballast pump from ballast / de-ballast mode to a fire pump mode (10)
(b) How is the emergency bilge suction tested? (10)
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