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Title: UNDERSTANDING HYDROCARBON DEW POINTS IN NATURAL GAS MIXTURES
Author: James N. Witte
Source: 2022 Appalachian Gas Measurement Short Course
Year Published: 2022
Abstract: This paper will present a discussion on the hydrocarbon dew point of a gas, and is intended as an introduction for operations technicians to the conditions that determine a hydrocarbon dew point value, operating concerns gener- ated when the hydrocarbon dew point is reached, and approaches to the management of gas quality to control hydrocarbon dew point in pipeline systems. The hydrocar- bon dew point is one of the most important parameters defining the quality of a natural gas mixture. The signs of having reached hydrocarbon dew point are readily recognizable. Evidence of reaching the hydrocar- bon dew point include a high liquid line (stain) found on an orifice plate, liquid that is found when trying to take a gas sample or a sound speed comparison error in an ultra- sonic meter diagnostic routine. One of the distinguishing characteristics of hydrocarbon liquid is that at atmospher- ic pressure and temperature the liquid will rapidly vaporize without a trace. The formation of hydrocarbon liquids can pose several operating problems. The liquids can accumulate in a low point in the pipeline or move as a collective slug of liquid. If they reach a compressor, a boiler, or a gas turbine the results could be a catastrophic failure of the equipment. Hydrocarbon liquids can also bias gas analysis equipment and prevent gas operated pneumatic controls from func- tioning properly. Therefore, understanding the conditions under which hydrocarbon liquids will form and precautions that can be taken to avoid hydrocarbon liquid formation is important.

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