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Title: PRACTICAL CONSIDERATIONS FOR GAS SAMPLING AND GAS SAMPLING SYSTEMS
Author: David J. Fish
Source: 2019 Appalachian Gas Measurement Short Course
Year Published: 2019
Abstract: The amount of hydrocarbon product that is transported between producer, processor, distributor and user is signicant. To be able to verify the exact composition of the product is important from an economic and product treatment standpoint. A small percentage savings made by correctly determining composition will quickly recoup the investment made in the purchase of a system designed to obtain an optimum sample. In addition, if the best sampling procedures are followed, the potential for disputes between supplier and customer will be greatly reduced. The importance of properly determining hydrocarbon gas composition benets all parties involved and will achieve greater signicance as this precious commodity becomes less plentiful and more expensive. From the Gas Processors Association publication GPA 2166-05, The objective of the listed sampling procedures is to obtain a representative sample of the gas phase portion of the owing stream under investigation. Any subsequent analysis of the sample regardless of the test, is inaccurate unless a representative sample is obtained. And, from ISO-10715, a representative sample is, A sample having the same composition as the material sampled, when the latter is considered as a homogeneous whole. API 14.1 offers a similar statement in the latest revision, a representative sample is compositionally identical or as near to identical as possible, to the sample source stream, as does ASTM 5287-97. These standards are the most common referenced on Gas Sampling procedures, along with the AGA Gas Measurement Manual, Part No. 11, Section 11.3.

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