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Title: Auditing Electronic Gas Measurement Per API Chapter 21.1
Author: Belenda L. Tonge
Source: 2007 International School of Hydrocarbon Measurement
Year Published: 2007
Abstract: What is an audit? According to Websters dictionary, an audit is an examination or verification of financial records or accounts. In the hydrocarbon industry, the financial records begin with the measurement data. Why audit? Specific reasons not withstanding, an audit is performed to ascertain the accuracy of the data upon which the exchange of money is based. What is needed to perform an audit? The wide spread use of flow computers changed the scope of the supporting information needed for determining the accuracy of the resulting volumes. Documentation for chart recorders is comprised of a paper chart, the integration statement, a gas analysis certificate and a meter inspection report, along with documentation of any change to the meters configuration. The petroleum industry recognized that a variety of electronic measurement recording devices would be used. Therefore, a set of standards was needed to establish minimum requirements for what these devices were to accomplish and what documentation would be needed in an audit trail. In September 1993, the American Petroleum Institute published Chapter 21, Flow Measurement Using Electronic Metering Systems, for inclusion into the Manual of Petroleum Measurement Standards. Section 1 covers Electronic Gas Measurement. Sub-Section1.6, Audit and Reporting Requirements, details what information is needed from an electronic gas measurement system for audit purposes

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