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Title: Revision Of ANSI-2530 Orifice Meter Standard - Basis Of Recommended Meter Run Length
Author: W. Studzinski, U. Karnik P. La Nasa, T. Morrow D. Goodson, Z. Husain J. Gallagher
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: The latest revision of the ANSI/API-2530 orifice meter standard introduces significant changes in order to improve the performance of the orifice meter when subjected to non-ideal flow conditions. In the case of bare tube installations, existing recommendations have been changed and additional recommendations have been provided for new types of pipe fittings. The major finding was that users of orifice meters have to be particularly careful in selecting meter run lengths for installations which generate flow swirl, for example, headers or elbows out of plane. For applications using flow conditioners several revisions have been made. The use of the 19 tube bundle flow straightener has been subjected to several new restrictions. To obtain optimal performance from an orifice meter for a given application, the flow straightener has to be used in accordance with recommendations for its locations, meter tube length and orifice b-ratio. Moreover, the new tube bundle flow straightener has to meet defined mechanical specifications and tolerances to deliver the expected performance. The standard also provides a performance test procedure, which would allow the use of other flow conditioners, for example, isolating type flow conditioners. Specifications for orifice meter run lengths have been revised by using high quality data, evaluated by well defined rules within the framework of practical considerations. These changes will result in a metering device, which is more accurate, repeatable and reliable and can be considered on par with other metering technologies. The present paper describes the process, which was used to accept data and develop new recommendations for the orifice standard. It provides the necessary background information, which can help users understand the reasons behind the proposed changes and demonstrates that the recommendations indeed result in a much improved orifice meter performance.




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