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[ pdf ] BTU ANALYSIS USING A GAS CHROMATOGRAPH

BTU ANALYSIS USING A GAS CHROMATOGRAPH Download
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Topic under  Gas Analyzers
Source: www.afms.org 
File size: 38.49 KB
File type: pdf
Last download on: Sun May 14, 2017 10:48:55 PM
Short Desciption:
The most widely used method to determine BTU content of natural gas is by gas chromatograph. The analytical data provided by this means represents over half of the weighted information needed for total energy determination. The potential financial impact of this data is tremendous. It is imperative that the quality of the data produced by laboratories using gas chromatographs for BTU determination is accurate.

Summary:
The first step in the process is to obtain a sample that is representative of the flowing stream. The sample procurement phase offers much opportunity to invalidate the process of producing accurate analytical data. It is unlikely that an analysis of a compromised sample will provide meaningful data. The personnel responsible for sampling must understand hydrocarbon phase behavior and how to obtain a representative sample. There are eight methods listed in GPA Standard 2166 “Obtaining Natural Gas Samples for Analysis by Gas Chromatograph ”. These techniques are for obtaining “spot” samples. Personnel must follow the method chosen precisely. The more desirable means of obtaining natural gas samples is to use a continuous sampler, taking sample “bites” proportional to flow rate. Regardless of the sampling technique chosen, the following requirements apply. The sample point must have a sample probe installed or the quality of the sample procured will be of questionable validity. The sampled stream must be of a single-phase fluid and should be flowing at its normal rate. During the sampling process it is important to remove all atmospheric air and to not alter the component composition of the sample.
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