1. Science
  2. Publications
  3. Information Processing Systems
  4. 4(155)'2018
  5. Uncertainty evaluation of gas flow rate measurements by ultrasonic transducer

Uncertainty evaluation of gas flow rate measurements by ultrasonic transducer

T. Vladimirova, M. Shalabanova
Annotations languages:

Description: The required level of accuracy of gas flow measurements is defined commonly by the conditions peculiar to sphere of the results application. The technique, which is proposed in the article, enables the conduction of estimation of volumetric flow rate and volume of gas with inherent parameters converted to standard conditions, according to exact accuracy norms of measure-ments and required principles. This facilitates the qualification grade of works to be carried out at factories functioning as en-terprises with higher risk. The flow rates measurements are conducted at operational conditions by indirect method of dynamic gauging of volumetric flow rate and gas volume with ultrasonic flow transducer. Functioning principle of equipment bases on connection of differences in time of flight of ultrasonic impulse with and against gas flow between sound detectors from an aver-age velocity of gas stream along acoustic path. Acceptable relative expanded uncertainty of flow rate measurements for “A” accuracy level constitutes 0,3% for operational conditions that exceeds the resulted value, which is determined by the unac-counted errors for the suggested method. This heavily traceable error lies in systematical inaccuracy during calibration of de-vice. Among other things are liquid droplets occurring in the flow, low acoustic resistance of gas and high rate of sound absorp-tivity and low valuable signal, which is caused by prevailing sound velocity comparing with flow velocity. The technique of sug-gested uncertainty evaluation is applicable for facilities extracting and treating gas and condensate at shore and offshore fields as well. In the case, the homogeneity of measured flow obtained by separation is the most affecting factor of successful evalua-tion. For prevention of interfering factors, the gauge is recommended to fix after the treating facilities at the pipes with gas flow and to make pigging of inner surface on due time.

Keywords: gas flow measuring, uncertainty, standard conditions, ultrasonic transducer


1. Baluev, A.Yu., Prokkoev, V.V., Sabirov, A.I. and Yumankin, I.A. (2013), “Izmeritelnyje sistemy na baze ultraz-vukovykh mnogoluchevykh preobrazovateley” [Measurement systems based on ultrasonic multibeam flow transducers for hy-drocarbon pipeline systems], Mir izmerenij, No. 4, pp. 21-31.
2. Zamaletdinova, E.Yu., Yagyaeva, L.T. and Zamaletdinov, R.R. (2011), “Imitatsyonnyy metod poverki ultrazvukovykh raskhodomerov” [Simulation method of verification of ultrasonic flow meters], Vestnik Kazanskogo tekhnologicheskogo univer-siteta, No. 19, available at: https://cyberleninka.ru/article/n/imitatsionnyy-metod-poverki-ultrazvukovyh-rashodomerov (accessed 26 october 2018).
3. National Standard (2013), “GOST 8.611-2013 Hosudarstvennaia systema obespechenyia edynstva yzmerenyi. Raskhod y kolychestvo haza: metodyka (metod) yzmerenyi s pomoshchiu ultrazvukovykh preobrazovatelei raskhoda” [GOST 8.611-2013 State system for ensuring the uniformity of measurements. Flow rate and quantity of gas. Technique (method) of measurements by ultrasonic meters], Interstate Council for Standardization, Metrology and Certification.
4. Company-specified Standard (2005), “STO GAZPROM 5.2 – 2005 Raskhod y kolychestvo pryrodnoho haza metodyka vypolnenyia yzmerenyi s pomoshchiu ultrazvukovykh preobrazovatelei raskhoda” [STO GAZPROM 5.2 – 2005 Flow rate and quantity of natural gas. Technique of measuring by ultrasonic flow transducers], Moscow.
5. Lapshin, V.I. and Volkov, A.N. (2011) “Koeficient szhymaemosti gazov i gazokondensatnyh smesey: eksperimentalnoye opredelenie i raschyety. Aktualnyye voprosy issledovaniy plastovykh system mestorozhdeniy uglevodorodov” [Compression fac-tor of gases and gas-condensate mixtures: experimental observation and calculation. Actual research questions of embedded systems of hydrocarbon fields], LLC “GazpromVNIIGAZ”, available at: www.vesti-gas.ru/sites/default/files/attachments/120-131-sbornik_plasty_ch1_v4_0.pdf.
6. Description of the type of measuring equipment. Ultrasonic flow meters of MPU model: MPU 1200, MPU 800, MPU 600 and MPU 200. Supplement for certificate № 52826.
7. Ma, L., Liu, J. and Wang, J. (2012), Study of the Accuracy of Ultrasonic Flowmeters for Liquid, AASRI Procedia, Vol. 3, pp. 14-20.
8. Cordova, L., Furuichi, N. and Lederer, T. (2015), Qualification of an ultrasonic flow meter as a transfer standard for measurements at Reynolds numbers up to 4×106 between NMIJ and PTB, Flow Measurement and Instrumentation, Vol. 45, pp. 28-42.

 Vladymyrova, T.M. and Shalabanova, M.S. (2018), “Otsenka neopredelennosty rezultatov yzmerenyi raskhoda haza ultrazvukovыmy preobrazovateliamy” [Uncertainty evaluation of gas flow rate measurements by ultrasonic transducer], Information Processing Systems, Vol. 4(155), pp. 84-91. https://doi.org/10.30748/soi.2018.155.11.