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Q5. With reference to centrifugal separators used for oily bilge duty:

(a) explain why centrifugal oily water separators are superior to those which rely on gravity (3)

(b) describe, with the aid of a sketch, how flow over the centrifugal separator plates can break down emulsions by encouraging flocculation of particles and coalescence of droplets; (5)

(c) state how the bilge overboard control valve can only operate by the Chief Engineer:(1)

(d) state a value of overboard parts per million oil content that may be set which is below the generally recommended value. (1)