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Title: Experiences with Permanent Series Connection of Ultrasonic Gas Flow Meters (USM) in the German Gas Market
Author: Daniel Heinig Toralf Dietz Jrg Wenzel Claus Girschik
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: The design of metering stations in Germany varies greatly. However, in recent decades, connecting two gas flow meters in series has become established as best practice for many metering stations. The design was first described in the German verification law Mess- und Eichverordnung (Appendix 7, 5.6.7)1, where two meters with different metering principles were intended to be used. Connecting them in series allows an annual extension of the recalibration period as long as: 1) Both meters have a certified design (type approval), 2) Both meters are calibrated initially, 3) The change of the flow deviation between the two gas meters during operation is less than 0.5%. In recent years, the benefits of ultrasonic flow meter technology, especially the low pressure drop and diagnostic capabilities, were the driving force to allow series connections of two USM. The series connection of two independent USMs is now the favored solution in many metering stations in Germany. In 2013, the Physikalisch Technische Bundesanstalt (PTB) consolidated end users experience with connecting USMs in series into the technical guidelines TR-G 18 Requirement for permanent series connection of two ultrasonic gas flow meters. This paper offers an overview of typical USM-USM setups and discusses experiences of recent years.

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