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Title: Analytical Requirements For Hydrocarbon Dewpoint Calculation.
Author: Chris Cowper
Source: American Gas Association 2004
Year Published: 2004
Abstract: Hydrocarbon dewpoint is an important characteristic of natural gas in respect of pipeline operation and critical for fuelling of gas turbines. It is usually specified as a limiting temperature above which no liquids can separate from the gas. Sometimes this is replaced with a maximum quantity of condensed liquids specification. In Northern European countries a dewpoint temperature would typically be not greater than -20C (280F) at any pressure. A quantity specification could be not more than 5 mg of condensate per cubic metre (0.04 gallons/MMSCF) at -20C (280F) and any pressure. The at any pressure phrase recognises that the maximum dewpoint temperature (the cricondentherm) is found at a pressure intermediate between those used in transmission and those used in distribution. The de facto method for dewpoint temperature is the cooled mirror device, in which the temperature of a mirror surface in contact with the gas at a selected pressure is recorded as the first appearance of liquid condensate is observed. This may be manual (1) or automatic (2). Hydrocarbon content is measured by treating a flow of gas to the specified temperature at a selected pressure and measuring the rate of liquid condensate formation (3). Measurement of gas composition (4) and calculation of phase properties using an appropriate equation of state (5, 6) gives dewpoint temperature or amount of condensate at specified conditions or both. This paper reviews the physical and analytical approaches and gives guidelines for the latter.

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