Chapter 11
Bearings, Seals and Lubrication Systems


The bearings in gas and steam turbines provide support and positioning for the rotating components. Radial support is generally provided by journal or roller bearings, and axial positioning is provided by thrust bearings. Some engines, mainly aircraft jet engines — use ball or roller bearings for radial support but nearly all-industrial gas turbines use journal bearings.

A long service life, a high degree of reliability, and economic efficiency are the chief aims when designing bearing arrangements. To reach these criteria, design engineers examine all the influencing factors:

1. Load and speed

2. Lubrication

3. Temperatures

4. Shaft arrangements

5. Life

6. Mounting and dismounting

7. Noise

8. Environmental Conditions.

  • Bearings
  • Rolling Bearings
  • Journal Bearings
  • Thrust Bearings
  • Seals
  • Non-contacting Seals
  • Lubrication Oil System
  • Lubricant Selection
  • Oil Sampling and Testing
  • Oil Contamination
  • Filter Selection
  • Cleaning and Flushing
  • Coupling Lubrication
  • Lubrication Management Program

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