A motor vessel has two centrifuges to pre-treat fuel to the engine(s) which may be configured to operate in series or parallel. A large quantity of water has been determined to be present in the fuel. What actions would you take to minimize the effect of water prior to fuel injection?

Correct Answer: Option D — Run first centrifuge as a purifier in series with second as clarifier and reduce throughput and increase 'shoot' cycles'.

To effectively process fuel with excessive water, the first centrifuge must operate as a purifier at a reduced throughput rate to maximize water separation efficiency, while the second centrifuge operates in series as a clarifier with increased sludge-discharge frequency.