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Title: Oiml R 137-1, The First Ultrasonic Meter To Be Tested To Accuracy Class 0.5?
Author: Skule Smrgrav Atle K. Abrahamsen
Source: 2009 North Sea Flow Measurement Workshop
Year Published: 2009
Abstract: Over the past 20, 10 and 5 years gas production world wide has been on an ever increasing rise. At the same time measurement of gas has been changing from the traditional turbine and orifice meters to the ultrasonic meters. Multi-path gas ultrasonic meters have by now become the preferred device for custody transfer measurement. The first step in an international acceptance of these state of the art technology based devices was probably the first edition of the AGA Report number 9 which was released in June 1998. This report was updated and the second edition was released in April 2007. The AGA Report No. 9 has since been used all over the world as the reference standard when ultrasonic meters have been specified for most allocation and custody transfer projects. In Europe there has been a working group in session for several years working on a corresponding ISO standard for Ultrasonic meters, and the ISO 17089 will hopefully be officially released in 2009. But, there is another standardization organ in Europe which released a gas meter recommendation in 2006 which is also applicable to ultrasonic meters - the OIML R 137-1. This creates a third standard which manufactures of gas ultrasonic meters may be asked to follow. Already a number of meters have been tested to the defined accuracy class 1 in OIML R 137-1, but FMC has now fully tested what we have been informed is the first multi-path gas ultrasonic meter to the accuracy class 0.5 together with the PTB of Germany. This paper will describe the key items of OIML R 137-1, point to the differences and similarities between OIML R 137-1 and AGA-9 and highlight certain limitations/shortcomings in OIML R 137- 1. The second part of the paper will describe the detailed tests required for accuracy class 0.5, show the results from multiple size meters tested and comment on how the industry and standardization committees can work even closer together to get even more applicable and relevant standards and test methods. The latter to achieve more repeatable, comparable and usable results across the industry, and across the different geographical areas of our shrinking planet.

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