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Title: OVERVIEW OF GPA 2172/API 14.5 REVISION
Author: Matt Holmes
Source: 2022 International School of Hydrocarbon Measurement
Year Published: 2022
Abstract: GPA Standard 2172 / API Manual of Petroleum Measurement Standards Chapter 14, Section 5, Calculation of Gross Heating Value, Relative Density, Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody Transfer, Third Edition, January 2014 provides methods to calculate a variety of necessary properties from a gas analysis. Several important changes occurred in the 2009 revision of the standard, which was most recently reaffirmed in 2019. The main changes are for incorporating water vapor into the analysis calculations and calculating theoretical hydrocarbon liquid content on a real gas basis. Additional cautionary notes are provided regarding the characterization of heavier components and accounting for water in the gas analysis, and a number of detailed example calculations are provided. Refer to the standard itself for requirements, procedures, details and further explanation.

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