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.” This document is also known as American Gas Association Report No. 3, Part 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: Part 2: Part 3: Part 4:
General Equations and Uncertainty Guidelines Specification and Installation Requirements
Natural Gas Applications
Background, Development Implementation Procedure
The focus of this paper is Part 2 of the standard.