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Title: Auditing Electronic Gas Measurement per API chapter 21.1
Author: Duane A. Harris
Source: 2018 International School of Hydrocarbon Measurement
Year Published: 2018
Abstract: API 21.1 is recognized as an international industry standard documenting the Electronic Gas Measurement (EGM) system audit and record requirements for differential and linear meter measurement. This standard is used by the measurement community to reduce the overall EGM system uncertainty and improve measurement data integrity. Measurement data integrity plays a critical part in overall measurement accuracy for all organizations and has a direct impact to the financial bottom line. Measurement integrity is also vital for ensuring compliance with regulatory and industry standard requirements. On August 1st, 1993 the first edition of the American Petroleum Institute (API) Manual of Petroleum Measurement Standards (MPMS) Chapter 21.1 Flow Measurement Using Electronic Metering Systems-Electronic Gas Measurement was released following a four year collaborative effort. This document provided the industry with a much needed standard to use as a reference for several key areas related to custody transfer gas measurement when performed with flow computers.

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