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Title: BTU/Water Vapor Content Adjustment
Author: C. W. Barllett
Source: 1982 Appalachian Gas Measurement Short Course
Year Published: 1982
Abstract: In the natural gas industry, the term Btu/cf has recently become a hot subject. Mostly because of federal rulings on price adjustment, but probably as much because of people like you and me who have to try and solve the mechanics for obtaining our answer. A variety of definitions can be found to describe Btu, British thermal unit, but essentially, its basic meaning relates to heating value. The heating value of natural gas is usually determined by calorimetry or analysis. A calorimeter is a mechanical device designed to measure and usually record the Btu value, whereas the analytical method requires calculating the Btu value based upon the mol fraction or precent of the hydrocarbon compounds contained in the gas. The calorimeter, using the wet gas meter principle, saturates the gas with water vapor and the Btu value is determined on a wet basis. The usual chromatographic process used for determining the gas constituents normally eliminates water vapor content from the sample and the calculation is made on a dry basis.

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