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Title: Fundamentals Of Hydrocarbon Dew Point Measurement
Author: Jack Herring
Source: 2008 Appalachian Gas Measurement Short Course
Year Published: 2008
Abstract: Hydrocarbon Dew Point is becoming a critical tariff parameter but it has always been a vital operational parameter for the pipeline industry. Measuring it must be done properly or serious errors can jeopardize tariff compliance resulting in shut-ins. If liquids build up, especially if water condensates are present allowing hydrate formation to occur, in the pipeline, that can damage compressors, valves and other in-pipe devices. Overcompensation for poor analysis techniques, or a less than optimal choice of instrumentation, will also add signifi cantly to operational costs. The focus of this paper is to identify the major factors that contribute to best practices for measuring the hydrocarbon dew point (HCDP) in natural gas. The three most popular methods for measuring this parameter will be discussed. These three techniques are: Manual visual method with a Bureau of Mines chilled mirror dew point instrument. Equation of state calculations from constituent analysis by gas chromatography. Automatic optical condensation dew point in stru ment. Each technique will be described along with the inherent issues that can enhance the use of the specifi c technique along with results that have been achieved by independent laboratory testing. Pros and cons for each technique will be listed that will provide a basis for comparing these three methods of measurement for this important parameter.

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