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Title: Method For Performance Testing Of Natural Gas Sampling Systems
Author: Donald P. Mayeaux
Source: 2007 Natural Gas Sampling Technology Conference
Year Published: 2007
Abstract: The analysis of natural gas (NG) plays a key role in determining its monetary value. The NG BTU content value and the physical properties utilized in computing its volume, both of which directly impact its value, are derived from compositional analysis. The typical on line natural gas analytical system is divided into two basic sections. The analyzer, which is typically a gas chromatograph (GC) and a sample conditioning system (SCS).The function of the SCS is to extract a representative sample from the source gas, usually a pipeline, condition it, then transport it to the analyzer for compositional analysis. It is a well accepted fact that the SCS is the source of more than 75% of the errors involved in the analysis of NG. Given this fact, it is baffling that the analyzer, which contributes the least error, has been the focus of attention. Industry standards, such as the API chapter 14, section 1, provide valuable guidelines for the design, construction and operation of the SCS. The standards also provide guidance on the preparation, transportation, and storage of the gas mixture utilized in calibrating the online GCs. However, to the authors knowledge, there are currently no standardized methods of testing or verifying the performance of sampling conditioning systems for on line GC analysis of NG.

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