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Title: Effect Of Ceh- Hydrocarbons On Dewpoints And Heating Values
Author: Richard F. Bukacek
Source: American Gas Association 1986
Year Published: 1986
Abstract: Gas samples in general and calibration gases in particular are subject to the possibility of condensation during storage and transit. Gaseous hydrocarbon mixtures, whether natural gases or man-made mixtures, will typically contain traces of the heavier hydrocarbons. These trace materials can raise the hydrocarbon dew point of the mixture and thereby alter the heating value of the sample if the condensation process is not fully reversible. With the high market value for natural gases, consideration of third-order effects on composition can become important, and several questions arise with regard to traces of the Cj + hydrocarbons. For example: 1. What constitutes a trace amount that need not be accounted in determing a heating value? 2. If irreversible condensation takes place in a calibration sample and trace components are present, at what temperature would a significant change in composition of the vapor phase be observed? 3, Is it important to characterize the C6 + hydrocarbon traces before estimating their effect on a calibration gas?

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