How is lube oil typically supplied to main bearings?

Lube oil is typically supplied to main bearings through a lube supply pump. The lube supply pump is responsible for pressurizing and circulating the oil from the oil tank to the engine's bearings and other critical components. This pressurized flow ensures that the oil reaches the bearings effectively, providing the necessary lubrication, cooling, and cleaning to prevent wear and tear during operation.

Using a pump is essential because it allows for control over the lubrication system, enabling the oil to reach various components under varying conditions of the engine. This ensures that the necessary oil flow is maintained even during changes in speed or load, which is critical for the reliability and longevity of the gas turbine system.

In contrast, other methods such as gravity feed or a direct supply from the oil tank may not provide the necessary pressure and control needed for effective lubrication in high-demand environments like gas turbines. A dedicated scavenge line primarily returns oil back from the bearings to the oil tank rather than supplying fresh oil, further underscoring why the use of a lube supply pump is the most effective method for ensuring proper lubrication.