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Title: Hydrocarbon Dew Point Effects On Gas Flow Measurement
Author: Fred Van Orsdol
Source: 2009 International School of Hydrocarbon Measurement
Year Published: 2009
Abstract: The hydrocarbon dewpoint (HCDP) of interest to the natural gas industry is simply an operating condition that causes liquids to condense out of the gas stream and form a liquid phase. Normal condensation occurs when increasing pressure or decreasing temperature causes liquids to form. Retrograde condensation occurs on a different portion of the phase envelope, wherein increasing temperature or decreasing pressure may cause the gas to cross the phase boundary and produce condensation. Both processes produce liquids condensing out of gas phase streams and are of interest to this presentation. Phase diagrams will not be discussed further in this paper, other than to mention that present correlations to predict phase behavior have proven to be inaccurate for relatively rich gas streams and typically predict HCDP temperatures well below the actual HCDP temperature. I will try to characterize rich gases, as referred to in this paper, by indicating those at or above 1050 Btus per cubic foot and containing some C4 thru C6+ components (butanes thru natural gasoline).

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