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Title: INTRODUCTION TO GAS ULTRASONIC METERS
Author: JOHN LANSING
Source: 2019 Western Gas Measurement Short Course
Year Published: 2019
Abstract: This paper is an overview gas ultrasonic meters, which are also known as USMs. Discussion topics include principles of operation, different path configurations, basic diagnostic features, AGA Report No. 9, flow calibration issues, flow conditioning, basic piping design, routine maintenance considerations, control valve noise mitigation and a variety of other aspects to consider when using gas ultrasonic meters (USMs). It primarily discusses fiscal-quality, multi-path USMs and does not cover issues that may be different with non-fiscal meters. These are typically single path designs which can be spool-piece meters or clamp-on designs. Although todays USMs use the same transit-time principle of operation, diagnostics for each manufacturer does vary. This will be discussed in some detail later in this document. Additionally, all brands and path configurations that are used for custody transfer applications must meet basic requirements as discussed in The American Gas Associations AGA Report No. 9 Ref 1 & 2.

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