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Gas-charged media

Gas-charged media are liquids and solids containing dissolved and/or undissolved gases. Gas-charged liquids are important with regards to sealing systems. Following distinctions are drawn:

  • Liquids in open systems contain components of air and, possibly, further gases commensurate with their solvent power.
  • Liquids in closed systems are mostly completely or partially saturated with gas. Here the dissolved gases have a variety of origins:
  • Gases absorbed from pressurization and/ or overlaying with (inert) gas.
  • Gases added for process-specific reasons or created during the process.

 
With all gas-charged media a considerable rise of temperature and/or drop of pressure results in gas emission. Formation of a gas ring around the sealing gap (risk of dry running) can be prevented by a suitable geometry of the seal face front. Values below the vapour head or above the boiling point also lead to evaporation of the medium and hence "gas emission". Large differences of temperature and/or pressure in the sealing gap of a mechanical seal can cause dry running and hence damage to the mechanical seal.