Which of the following statements concerning the operation of a lube oil purifier is correct?

Correct Answer: Option A — They should be operated at maximum design speed and recommended operating capacity.

Centrifugal purifiers must operate at design speed to generate the necessary centrifugal force for effective separation of water and contaminants. Operating at rated capacity ensures the residence time within the bowl is optimized, preventing the carry-over of impurities into the clean oil stream, consistent with marine machinery maintenance best practices.