How jacking oil pump works in a turbine?

A jacking oil pump is used in turbine applications to provide lubrication and cooling to the bearings during startup and shutdown. It operates by delivering oil at a low flow rate to create a hydrodynamic film between the rotating shaft and the bearings, preventing metal-to-metal contact and reducing wear. Once the turbine reaches operational speed, the main lubrication system takes over, allowing the jacking oil pump to shut down. This process is crucial for ensuring the longevity and reliability of the turbine components.