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Article

  • Title

    INVESTIGATING THE ADDITIONAL UNCERTAINTY OF FLOWRATE MEASUREMENT CAUSED BY SYMMETRICALLY DISTURBED FLOW

  • Authors

    Matiko F. D.
    Kostyk I.
    Matiko H.
    Roman V.

  • Subject

    INFORMACION TECHNOLOGY. AUTOMATION

  • Year 2020
    Issue 1(60)
    UDC 681.121.84
    DOI 10.15276/opu.1.60.2020.14
    Pages 142-152
  • Abstract

    When flowmeters are used in technological conditions significant additional errors in flow measurement are often caused by distortion of the flow velocity profile upstream the primary device. The distortion of the flow velocity profile can be caused, par- ticularly, by concentric protrusions in the pipeline. The purpose of this paper is to investigate the effect of concentric protrusions, which form a symmetric flow distortion upstream the standard orifice plate, on the uncertainty of flow measurement result. The additional component of uncertainty was studied experimentally. For this purpose a setup was developed consisting of two series-installed differential pressure flowmeters, a reference and a test one, with an inner diameter D=0.1 m. The effect of the protrusions was investigated by installing concentric rings that imitate the protrusion height h=0.025D, 0.05D, 0.1D. Experimental studies were performed for standard orifice plate with relative diameter β=0.2; 0.4; 0.5; 0.67 provided that there is a protrusion at a distance L=2D, 5D, 10D upstream the orifice plate. According to the results of experimental studies the authors calculated the values of the relative deviation of the orifice plate discharge coefficient δCp caused by the concentric protrusion upstream the orifice plate. It is confirmed that the dependence of the relative deviation δCp versus the Reynolds number is close to linear for the developed turbulent flow, so the effect of the protrusion height for each fixed value of h and L can be reproduced by the mean relative deviation. Analytical dependencies are developed to calculate the mean relative deviation from the design characteristics of flowmeter and the additional expanded uncertainty of measured flowrate is proposed to be evaluated by these dependencies. Applying the results of the paper makes it possible to evaluate the uncertainty of flow measurement in technological conditions and, respectively, to determine the possibility of using flowmeters with available additional components of uncertainty.

  • Keywords differential pressure flowmeter, differential pressure flowmeter, orifice plate, discharge coefficient, flow velocity profile, concentric protrusion, additional uncertainty
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  • References

    Література

     

    1. Максимов М.В., Маслов, О.В., Писклова Т.С. Анализ эффективности управления энерговыделе- нием водо-водяных энергетических реакторов. Труды Одесского политехнического университе- та. 2005. Вып. 2(24). С. 86–89.

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    3. ДСТУ ГОСТ 8.586.5:2009. Метрологія. Вимірювання витрати та кількості рідини й газу із за- стосуванням стандартних звужувальних пристроїв. Частина 5. Методика виконання вимірювань (ГОСТ 8.586.5-2005, IDT). [Чинний від 01.04.2010]. Вид. офіц. Київ: Держспоживстандарт України, 2010. 196 с.

    4. ISO/TR 12767:2007. Measurement of fluid flow by means of pressure differential devices — Guide- lines on the effect of departure from the specifications and operating conditions (given in ISO 5167). [Publication date 09.2007]. 35 p.

    5. Teyssandier R.G. The effects of symmetric steps and gaps on orifice measurement. The 4th North Sea Flow Measurement Workshop. Norway, Stavanger, November 5-7, 1985. 22 p.

    6. Chakraborty G. Effect of various parameters on natural gas measurement and its impact on UFG. The 25th World Gas Conference. Malaysia, Kuala Lumpur, June 4-8, 2012. 12 p.

    7. Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids, ANSI/API 2530, Second Edi- tion. USA. 1985.

    8. White paper on “Orifice meter installation configurations with and without flow conditioners” / Studzinski W., Karnik U., Lanasa P. et al. American Petroleum Institute. USA, Washington, 1997. 252 p.

    9. Studzinski W., Weiss M., Attia J., Geerligs J. Effect of reducers, expanders, a gate valve, and two elbows in perpendicular planes on orifice meter performance. Flow Measurement 2001. Creating effi- ciency across industry sectors, international conference. UK, Peebles, May, 2001. 20 p.

    10. Weiss M., Studzinski W., Attia, J. Performance evaluation of orifice meter standards for selected T-junction and elbow installations. Proceedings of the 5th International Symposium on Fluid Flow Meas- urement. USA, Washington, April, 2002.16 p.

     

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    2. Pistun, Y., Matiko, H., Krykh, H., & Matiko, F. (2018). Structural modelling of throttle diagrams for measuring fluid parameters. Metrology and Measurement Systems, 25(4), 659–673.

    3. DSTU GOST 8.586.5:2009 Measurement of Flow Rate and Volume of Liquids and Gases by Means of the Standard Dierential Pressure Devices. Part 5. Measurement Technique (GOST 8.586.5-2005, IDT). [Publication date 01.04.2010]. Kyiv. National Organization for Standardization in Ukraine, 2010, 196.

    4. ISO/TR 12767:2007. Measurement of fluid flow by means of pressure differential devices — Guide- lines on the effect of departure from the specifications and operating conditions (given in ISO 5167). [Publication date 09.2007], 35.

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    6. Chakraborty, G. (2012). Effect of various parameters on natural gas measurement and its impact on UFG. The 25th World Gas Conference. Malaysia, Kuala Lumpur, June 4-8, 12p.

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    9. Studzinski, W., Weiss, M., Attia, J., & Geerligs, J. (2001). Effect of reducers, expanders, a gate valve, and two elbows in perpendicular planes on orifice meter performance. Flow Measurement 2001. Creating efficiency across industry sectors, International conference. UK, Peebles. 20 p.

    10. Weiss, M., Studzinski, W., & Attia, J. (2002). Performance evaluation of orifice meter standards for selected T-junction and elbow installations. Proceedings of the 5th International Symposium on Fluid Flow Measurement. USA, Washington. 16 p.

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