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Title: Investigations Regarding Installation Effects For Small Ultrasonic Gas Flow Metering Packages
Author: Geeuwke De Boer, Martin Kurth
Source: 1999 North Sea Flow Measurement Workshop
Year Published: 1999
Abstract: Ultrasonic gas flow meters for custody transfer measurement (accuracy better than 0.5%) have gained a rapid and increasing acceptance over the last few years. The most common applications are gas transmission and underground gas storage (UGS), due to the typical benefits of ultrasonic flow meters, such as no pressure drop, large turn down ratio and the bi-directional capability. Generally, this used to concentrate on the larger sized meters and installations (typically 10 and higher). An important contribution for the acceptance was the research regarding installation effects, which as a consequence, had mainly been focussed on larger sized meters. Based on trade-offs between the purchase price of an ultrasonic meter, operating costs, and total capital expenditure for a gas flow metering installation, it is anticipated that in the near future ultrasonic gas flow meters will also become a viable alternative for an increasing number of applications in smaller sized systems. The market has shown a specific interest in a package consisting of an ultrasonic meter and a flow conditioner. Also when a back-up meter or check meter is required a combination of an ultrasonic meter and a turbine meter would be an economical solution. Therefore it was considered to be of interest to initiate a research project dedicated to installation effects and the effects of various flow conditioners, for a smaller size ultrasonic gas flow meter (6), in particular in a package including a flow conditioner or a turbine meter. Results will be presented of a series of tests with different upstream conditions, performed at the HDV Lintorf test facility owned by Ruhrgas AG. Due to the fact that not all tests have been finished at the time of writing of this paper, the results are not yet complete and only the first sets of results will be presented in this paper. As typical applications for smaller sized meters are found in stations measuring the gas flow from a high pressure transmission line to a lower pressure distribution network or to a large industrial consumer, solutions are suggested to avoid the potential ultrasonic noise problem due to pressure reduction by means of optimising station design for use of an ultrasonic gas flow meter.

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