Q8. a) State the hazards which may be encountered when entering an enclosed space and the precautions that should be taken. (5)
b) Sketch and describe an oxygen analyser which can be used to sample the atmosphere in void or closed spaces. (5)
c) Instruction given to person entering the enclosed space as per the ISM procedures. (6)
Q8. With reference to fire smothering agents explain why:
a) Effectiveness of foam is directly related to its degree of effervescence and surface tension. (6)
b) low expansion foam is best suited for use against localized fire, while high expansion foam is most effective in with major conflagrations,
c) In the absence of foam appliances, water jets can be effectively used against oil fires (5)
Q9. With reference to MARPOL Annex I:
a) Draw a 15 ppm oily water separator and explain the principles of operation (8)
b) Periodical maintenance and checks tests required to be done to verify the effectiveness of the above system. (8)
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