Depending on the generation process digester gas is always water vapour saturated. After leaving the digester, the gas will cool down automatically and the steam condensates. The following table displays the dependency of the saturation of vapour on the temperature:

  

If the condensate would not be removed out of the gas pipe, disturbances are unavoidable, because the gas can no longer flow through the pipe. Therefore a sufficient condensate separation has to be installed.

The condensate separation out of the gas system should always be installed at the low points, because the condensate conglomerates automatically there. For these purposes, there are different devices available which are applicable according to the local requirements. These are in detail:

• condensate traps
• gavel filters
• ceramic filters
• condensate sluices
• gas drying units