The lube oil system shown in the illustration, is designed to lubricate the main bearings by what principle? Illustration GT-0023

Correct Answer: Option A — Spray lubrication with dry sumps.

Marine gas turbines utilize dry sump lubrication systems where oil is sprayed directly onto bearings and gears. The oil is then scavenged from the sump by pumps, cooled, and filtered before being recirculated. This design prevents oil churning and overheating, which is critical for high-speed turbine bearing performance.