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

Correct Answer: Option D — spray lubrication with dry sumps

Marine gas turbines utilize dry sump lubrication systems where oil is delivered to bearings via high-pressure spray nozzles. This ensures precise cooling and lubrication of high-speed rolling element bearings, while scavenge pumps immediately remove oil from the sump to prevent churning, overheating, and excessive oil consumption.