A motor vessel has three centrifuges to pre-treat the fuel which can be configured to operate in series, parallel, and series-parallel. A large quantity of water is determined to be present in the fuel. How would you configure the centrifuges to deal with this problem?

Correct Answer: Option B — Run two centrifuges in parallel as purifiers discharging to the third one in series as a clarifier.

Handling fuels with high water concentrations requires operating two purifiers in parallel to provide adequate residence time for water separation, followed by a third centrifuge configured as a clarifier to remove remaining fine solid particulates.