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Title: On-Line Computers For Custody Transfer
Author: Matthew A. Diese
Source: 2006 International School of Hydrocarbon Measurement
Year Published: 2006
Abstract: With the advent of Electronic Flow Measurement came a variety of calculation, auditing and calibration algorithms. Each manufacturer wrote software to meet either a producers requirement or their own proprietary algorithms. In the early phase of development, flow computer manufacturers tailored algorithms to meet their own hardware capabilities. These algorithms were then reviewed by users and modified to meet their own specific needs. These algorithms, while being effective, were by nature vastly different from one manufacturer to the next. These differences made it necessary to develop a standard for custody transfer meters so that regardless of the manufacturer, the measurement data will be consistent from one meter to the next. This standard became API Chapter 21 - Flow Measurement Using Electronic Metering Systems, Section 1 - Electronic Gas Measurement. API Chapter 21.1 provides the algorithms for all aspects of natural gas measurement for custody transfer. This includes calibration algorithms, calculation methods, historical record content, audit trail considerations as well as installation issues. The standard addresses orifice and turbine/linear measurement. While ultrasonic meters are not specifically addressed in the standard, it has become customary to treat them as turbine meters for measurement purposes. This paper will focus on calculation algorithms, record management and calibration methods.

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