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Title: Ultrasonic Flow Meters-Four Path
Author: Karst Van Dellen
Source: American Gas Association 1992
Year Published: 1992
Abstract: The multi-path ultrasonic gas flow meter is new in the field of gas flow measurement. But it shows considerable promise as a viable flow meter for custody transfer applications. The ultrasonic technology in gases was delayed because of the more complex transducer design for ultrasonic gas flow meters. The transducers must be in contact with the gas itself. The ultrasonic flow meter performance and its characteristics are nearly ideal. At present, single-path and multi-path designs are on the market. Depending on operational goals, either method can be used. Single-path designs have lower accuracy and repeatability and require longer upstream lengths. Multi-path units are more accurate but involve more electronics. In modern gas measurement technology, there are requests for shorter meter runs and the highest possible accuracy. This is true for production, transportation and distribution operations and for offshore platforms, where weight and space are predominant design factors. Multi-path technology will help fill many of these applications. British Gas started development of a four-path ultrasonic meter for use incustody transfer ten years ago. When the technical development was completed, they exclusively licensed Daniel Industries to produce that meter. The meter was developed considering the highest accuracy yet short meter runs for use in custody transfer. Several test programs with this meter are in progress in Europe, and 20 meters have been put into operational service. It will soon be introduced into the United States and Canada.

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