Article: Calculate water dewpoint in line gas transmission

[dimas_brata]

You can view the page at

[link Point to another website Only the registered members can access]

[carlo.stenali]

water dew point is difficult to calculate cause water is a polar, non ideal fluid,
you may consider the thermodynamic models developed by GERG,
EOS with complex mixing rules, models as CPA etc.
you can calculate water dew point as well as vapor-liquid-liquid phase envelope,
hydrate formation temperature and pressure
directly in Microsoft Excel with a library for process simulation as prode Properties,
see this thread :

[link Point to another website Only the registered members can access]
the method you utilize (chilled mirror) to measure the dew point is accurate but you measure the dew point of the mixture which can be higher than water dew point (if some heavy HC is present in mixture)

if you know the composition, for example as result of GC online analysis or laboratory)
you can calculate the HC dew point and water dew point (see the above thread about PRODE PROPERTIES),
also you can calculate these values ONLINE (see Prode thermodynamic server)