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Title: INSTALLATION OF GAS ULTRASONIC FLOW METERS
Author: DAVID CRANDALL
Source: 2019 Western Gas Measurement Short Course
Year Published: 2019
Abstract: Ultrasonic meters measure with exceptional precision when they are installed according to the manufacturers and the AGA recommendations. Keeping this in mind, the success or failure of an ultrasonic meter installation for custody transfer applications heavily depends on how it is installed. The challenges to successful installations arise when shortcuts are taken to lower costs or to meet specific site related issues. It is normally when these shortcuts are employed that one finds the meters installed performance varies from the meters calibrated performance. In custody transfer using liquid ultrasonic metering installations a field standard called a prover is used to compare its known volume to the volume measured by the meter. A correction factor, referred to as the meter factor, is applied to the volumetric calculations as an adjustment to the meters measurements. Gas ultrasonic metering installations typically do not have this standard known volume in the form of a prover and as a result, the gas industry depends upon transferring the meters laboratory calibrations directly to the field. This makes it imperative that the installation replicate as closely as possible the calibration conditions. This paper outlines the methods of installation that are known to deliver optimum performance. There are also references to AGA Report #9 2017 dealing with installation guidelines.

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