Q2. (a) Describe, with the aid of a sketch, an open loop system for reducing SOx emissions from engine exhaust gas, explaining how the system operates whilst the vessel is in open waters. (6)
(b) Describe, with the aid of a sketch, a closed loop scrubber system for removing SOx from engine exhaust gas, explaining the operation of this unit and stating when it would be used. (10)
2018/JUL: Most candidates answered this question well but some sketching was a bit basic and did not include monitoring arrangements
2011/MAR : a) One candidate sketched a DWI system, one wrote Ph is initially high and the system brings it down, one wrote Sodium is removed by the system, several sketches looked like spray water could fall into the engine. b) One candidate sketched a Urea system, one sketched EGR system, one was too simple-no cleaning, sensing or dosing, many did not state when the system would be used.
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