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Dissolved gas

The amount of gases present in a fluid depends on its pressure and temperature. British physicist William Henry proved the relationship between pressure, temperature and amount of dissolved gas in the 18th century. In layman’s terms, the lower the pressure or the higher the temperature, the smaller the amount of dissolved gas a fluid can hold.

Vacuum degassing

For vacuum degassing, part of the installation fluid is temporarily subjected to underpressure (vacuum). The gases dissolved in the fluid are released, separated and removed from the installation. The degassed fluid is returned to the installation and can once again absorb any free-circulating gases. Repeating this process continuously will release and remove almost all gases. The fluid will become so undersaturated that it will be impossible to release gas anywhere in the installation, which means that the issues mentioned above can no longer occur, resolving the issues in locations with limited overpressure and poor flow rates.

When to use vacuum degassing?

  • In installations with many branches and low flow rates.
  • For small temperature differences between supply and return. A vacuum degasser is not limited by fluid temperature.
  • If a through-flow deaerator cannot be mounted on the installation for practical reasons. A vacuum degasser can be connected in almost every part of an installation.

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