9. Special conditions of employment

9.1 Gases other than air. Vacuum

• Ambient gases other than air: the problem is so vast that it can only be addressed by recommending :

  • seek specialist advice on corrosion ;

  • consider the risks of condensation and re-vaporization, the effects of viscosity on lift, the risks of gas ignition on contact with the bearing, which may be heated by seizure, and, with abrasive dust-laden gases, protect bearings with seals.

• Vacuum ( , § 6.1): the vacuum prohibits the use of greases or oils that vaporize. Solid lubricant-based materials must therefore be used. For bearings, special cages and/or treatments are...