The main error of rotary gas meters may change during their operation because of mechanical wear of the meter moving parts. Control of changes in metrological characteristics of meters is carried out during periodic metrological verifications. In this paper, an investigation of the change in a main error of rotary gas meters during their operation was carried out based on the results of their metrological verification. The paper considers the results of periodic metrological verifications of rotary gas meters in the laboratories of four gas distribution companies. According to the results of processing the metrological verification protocols, the correlation of the rotary gas meter error with the measured gas volume was confirmed. Based on processing the set of meter error values and the measured gas volume for each of the checked flowrate values, regression dependencies of the error of the meter on the measured gas volume were developed. By averaging the obtained regression dependencies, a generalized dependence of the systematic error of RG-250 rotary gas meter on the measured gas volume was developed. The regression dependencies make it possible to estimate the change in the main error of RG-250 gas meters according to its measured volume and to decide on their additional (out-of-plan) metrological verification. This makes it possible to detect in time gas meters operating with a significant systematic error, and therefore to eliminate this error.
- Report on the research work "Modeling and minimization of natural gas imbalances and losses in gas transportation systems caused by measuring errors." Lviv, Lviv Polytechnic National University, 2012. – 283 p. (in Ukrainian)
- Matiko F.D. (2015). Methodological principles of determining the volume of natural gas losses and minimizing its imbalances in transportation and distribution systems: Abstract of the dissertation of Dr. Techn. Sc.: 05.11.01 / Lviv Polytechnic National University. – Lviv, 41 p. (in Ukrainian)
- F. Arpino, M. Dell'Isola, G. Ficco, P. Vigo. (2014) Unaccounted for gas in natural gas transmission networks: prediction model and analysis of the solutions / J. Nat. Gas Sci. Eng., 17, pp. 58-70. https://doi.org/10.1016/j.jngse.2014.01.003
- Arpino F., Canale L., Cassano M.L., Cortellessa G., Dell'Isola M., Ficco G., Tagliabue A., Zuena F. (2022) Link between unaccounted for gas in transmission networks and flow-meters accuracy. 19th International Flow Measurement Conference, FLOMEKO 2022. Chongqing, 1 - 4 Nov. 2022. https://doi.org/10.21014/tc9-2022.069
- E. C. De Oliveira, T. C. Lourenço. (2013) Comparison of different approaches to calculate a final meter factor for rotary-type natural gas displacement meters. Flow Measurement and Instrumentation, V. 30, P. 160-165. https://doi.org/10.1016/j.flowmeasinst.2013.02.005
- Z. Gacek, J. Jaworski. Optimization of measuring system construction in the context of high flow variability / Journal of Natural Gas Science and Engineering, Volume 81, September 2020, https://doi.org/10.1016/j.jngse.2020.103447
- DSTU EN 12480:2019 Gas meters. Rotary displacement gas meters. Kyiv, State enterprise “UAS”, 2022. – 56 p. (in Ukrainian)
- DSTU 9034:2020 Metrology. Rotary gas meters. Verification method. (in Ukrainian)
- Matiko F. D. (2014) Analysis of changes in metrological characteristics of industrial rotary gas meters during their operation. Bulletin of Lviv Polytechnic National University: Thermal Engineering. Environmental Engineering. Automation. No. 792. p. 75–83. (in Ukrainian)
- M. Dorozhovets. (2007) Processing of measurement results: Training manual. Publishing House of Lviv Polytechnic National University. 624 p. (in Ukrainian)