DRY RUNNING D027
A term normally associated with mechanical seals that means running without a lubricating fluid at the seal face.
A good carbon-graphite face will seldom be injured by the additional friction caused by dry running, but if the dynamic elastomer (rubber part) is located in, or near the seal face, the elastomer can be damaged by the increase in face heat.
Dry running is also a major cause of slip stick vibration problems.
See:sealing gases and non-lubricants