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Title: PRACTICAL IMPLICATIONS OF GEOMETRIC TOLERANCES IN API MPMS CHAPTER 14.3/AGA REPORT NO. 3 - PART 2
Author: Edgar B. Bowles, Jr., Jacob L. Thorson
Source: 2019 American School of Gas Measurement Technology
Year Published: 2019
Abstract: This paper describes the current contents of the United States (U.S.) orifice flow metering standard - American Petroleum Institute (API) Manual of Petroleum Measurement Standards (MPMS) Chapter 14.3, Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids, Part 2, Specification and Installation Requirements.1 This document is also known as American Gas Association Report No. 3, Part 2.2 As of the writing of this paper (i.e., May 2017), this standard was in its fifth edition and was last revised in March 2016. API MPMS, Chapter 14.3, includes four parts: Part 1: General Equations and Uncertainty Guidelines Part 2: Specification and Installation Requirements Part 3: Natural Gas Applications Part 4: Background, Development Implementation Procedure The focus of this paper is Part 2 of the standard. As a brief history of the development of API MPMS, Chapter 14.3, Part 2, research on orifice flow meters began in the U.S. around 1904. Thomas Weymouth published an ASME paper in 1912 describing the results of a series of flow experiments dating to 1904 that he had performed on a flange tap orifice meter. Orifice meter research by what was known at the time as the National Bureau of Standards (NBS) (now known as the National Institute of Standards and Technology (NIST)) and others continued through the late 1920s. The first U.S. metering standard was produced by the American Gas Association in 1930...AGA Report No. 1 (which later evolved into API MPMS, Chapter 14.3 or AGA Report No. 3) for orifice flow meters. This followed the publication of a preliminary report published in 1927 and revised in 1929.

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