Customized Forward Thrust Pad with Babbitt Alloy Surface and Precision Engineered Oil Wedge for Stable Oil-Film Formation in Steam Turbines

The forward thrust pad bears steady and continuous positive axial thrust for long-term service, acting as the main load-bearing surface. In contrast, the reverse thrust pad typically remains on standby and only bears transient short-term loads during unit start-up/shutdown, load rejection, or water hammer conditions.

As the forward pad operates under permanent load, its oil film must remain stable under all steady-state operating conditions, requiring stringent specifications for lube-oil flow, pad inclination angle, and thrust disc surface finish. The reverse pad remains unloaded most of the time, with oil film tending to break but with relatively controllable risks.

Continuous frictional heat generation maintains the forward pad at higher temperatures with greater heat dissipation demands. Improper oil-wedge design or insufficient oil supply can readily cause overheating and melting of babbitt metal.