Question 106Motor Plants - 1st Asst/Chief

70% to pass

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?

ARun both centrifuges in series as purifiers and increase 'shoot' cycles.
BMaintain normal fuel oil throughput through both centrifuges functioning as clarifiers and increase the 'shoot' cycle of the two clarifiers.
CDrain settling tank(s) and service tank more often only, and monitor reduction in water content.
DRun first centrifuge as a purifier in series with second as clarifier and reduce throughput and increase 'shoot' cycles'.
AI Explanation

The correct answer is D: Run first centrifuge as a purifier in series with second as clarifier and reduce throughput and increase 'shoot' cycles'. Explanation: To minimize the effect of water in the fuel, the best approach is to run the two centrifuges in series, with the first one acting as a purifier to remove the bulk of the water, and the second one functioning as a clarifier to further refine the fuel. By reducing the throughput and increasing the 'shoot' cycles (the process of discharging accumulated water and contaminants), the centrifuges can more effectively separate the water from the fuel, ensuring that only clean fuel is delivered to the engine(s). The other options, while potentially helpful, are not as effective as running the centrifuges in series with the purifier-clarifier configuration and adjusting the operating parameters accordingly.

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