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Title: Techniques Of Composite Sampling
Author: Paul P. Mcneely
Source: 2010 International School of Hydrocarbon Measurement
Year Published: 2010
Abstract: In todays cost-sensitive environment, it is important that the correct method be chosen to obtain consistent, repeatable and representative gas samples. This paper exams the principles and components that are integral to composite gas sampling. There are three (3) methods for sampling gas. Spot sampling (characterized in GPA 2166-05) is a relatively inexpensive sampling method. However, this snapshot in time approach creates an opportunity for the occurrence of expensive errors. Changes in the chemistry of the flowing gas between spot samples may generate inaccurate BTU values or compromise pipeline integrity. Using an online analyzer provides another approach to gas sampling. In applications requiring real time analysis of the flowing stream of gas, this is the optimum sampling method. But premium testing comes at a premium price, which in many cases cannot be justified by the return on investment in the equipment. Composite sampling is the pivot point between spot samples and online analyzers. It affords the accurate and repeatable gas samples at a user-friendly price.

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