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Title: Micrometer Measurement Of Orifice Meter Tubes Class Number 144
Author: Stephen T. Stark
Source: 1999 International School of Hydrocarbon Measurement
Year Published: 1999
Abstract: Improvements in electronic gas measurement technology, communication, and related systems development have had a positive impact on orifice metering. Even so, custody transfer measurement precision requires more than a well designed and manufactured flow computer using a set of smarl transducers and connected to a fast data retrieval system. State-of-the-art orifice meter EGM systems cannot deliver reliable results without correctly designed, fabricated, installed, and maintained orifice meter tubes. Flow calculations specified in Patis 1, 3, and 4 of the ANS1/APl 2530 (AGA-3) orifice meteringstandard are based on experimental test data collected using meter tubes built to specific tolerances. Since individual orifice meter tubes are not usuallyflow calibrated in the hydrocarbonenergy industry, every meter tube fabricated for custody transfer must conform to standard tolerances if uncertainties given in the standard are expected.

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