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Title: Effect Of The Latest Revision Of Ansi 2530(AGA #3) On The Primary Orifice Metering Element
Author: Douglas Watkins
Source: 1996 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1996
Abstract: Significant improvements in the equations which govern the measurement of natural gas using orifice meters, have necessitated changes in the primary devices used to gather the data. These changes have been incorporated into the new revision of the API 14.3 Part 2 Third Edition (AGA-3, ANSI 2530) and are detailed in the following discussion. 1. Eccentricity of the bore of the orifice plate to the bore of the fitting. 2. The distance from the face of the orifice plate to the sealing face of the orifice fitting. (Recess and Protrusion) 3. Pipe roughness and internal diameter tolerances. The error in the coefficient of discharge has been reduced by approximately one half when orifice meters(fittings, flanges, etc) conforming to the new revision of the standard are used. These new orifice meters are constructed to much tighter dimensional and configurational requirements than in the past. Orifice meters which do not meet the requirements of Part 2, must have an in-place calibration run to determine the coefficient of discharge curve over the range of Reynolds Number expected.

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