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Title: Natural Gas Sampling Uncertainties And Economics Eq 5230
Author: David Wofford
Source: 2000 International School of Hydrocarbon Measurement
Year Published: 2000
Abstract: The precise measurement of natural gas is a subject of continuing study and discussion. The impact of the precise measurement of gas quality and composition is often considered to only effect the thermal value of the measured quantity of gas. This idea, however, is far from accurate. The precise measurement of natural gas flow rates (quantity) is dependent upon the precise measurement of the composition of the natural gas product stream (quality). These measurements of quantities and thermal values are considered in terms of acceptable levels of measurement uncertainty. In other words, a level of vadance exists around the point of absolute accuracy which is considered acceptable to those who are party to the transfer of the product from the custody of one to another. Thus, the term custody transfer quality measurement implies that the determined quantity and total energy content of the product exchanged between parties are within these levels of acceptable variance, or uncertainty, from the absolute point of accuracy, or zero uncertainty.

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