Which of the following statements is true concerning the lube oil system shown in the illustration? Illustration SE-0011

Correct Answer: Option A — The drains from lube oil coolers can be directed back to the main sump, the sludge tank or the lube oil purifier.

Piping configurations in marine gravity lube oil systems permit draining contaminated or dirty oil from coolers back to the main sump, sludge tank, or directly to the purifier for continuous reclamation.