Enhancement factor for water vapor-pressure correction in humid methane

H.A. Sairanen (Corresponding Author), M.O. Heinonen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)


Energy gases are mainly composed of methane, and they are dried prior to pumping to natural gas grids. To avoid condensation of water-vapor related problems, the dew-point temperature is monitored. In dew-point temperature measurements, however, the water-vapor enhancement factor is needed to correct effects caused by pressure changes and to enable unit conversions when using instruments based on indirect measurement principles. In the work reported in this paper, new experiments were carried out, and methane–water equilibrium data available in the literature were analyzed for deriving a new equation. The derived equation provides an easy calculation method for the water-vapor enhancement factor in methane as a function of pressure and dew-point temperature. An uncertainty analysis for the equation is also presented covering the whole studied pressure ranging from atmospheric pressure up to 7 MPa, and the dew-point temperature ranges from +20°C down to hydrate forming temperatures.
Original languageEnglish
Pages (from-to)1280-1289
JournalInternational Journal of Thermophysics
Issue number6-7
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed


  • dew-point temperature
  • enhancement factor
  • humidity
  • methane
  • natural gas


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