Extended Lee model for the turbine meter &amp; calibrations with surrogate fluids

Pope, Jodie G.; Wright, John D.; Johnson, Aaron N.; Moldover, Michael R.

doi:10.1016/j.flowmeasinst.2012.03.005

Cited by 17 publications

(8 citation statements)

References 4 publications

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“…Likewise, the fluid kinematic viscosity does not directly affect the flow results in this type of LFS. However, depending on the type of MUT, the fluid kinematic viscosity can affect the flow meter output [5,6]. For the report of calibration, the fluid viscosities are periodically measured using a falling ball viscometer which measures the time required for a ball of known dimensions to pass by two detectors a known distance apart through the fluid in a capillary tube of known diameter.…”

Section: Fluid Propertiesmentioning

confidence: 99%

“…The dimensionless approach facilitates accurate flow measurements by the flow meter user even when the conditions of usage (liquid type, temperature) differ from the conditions during calibration. Hence for a turbine meter calibration, the calibration report will present Strouhal number vs. Roshko number [5,6]. In order to calculate the uncertainty of these flow meter calibration factors, we must know the uncertainty of the standard flow measurement as well as the uncertainty of the instrumentation associated with the MUT (normally b Certain commercial equipment, instruments, or materials are identified in this paper to foster understanding.…”

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confidence: 99%

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Liquid Flow Meter Calibrations with the 0.1 L/s and the 2.5 L/s Piston Provers

Pope¹,

Wright²,

Johnson³

et al. 2013

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This document provides a description of the 2.5 L/s and 0.1 L/s liquid flow calibration standards operated by the National Institute of Standards and Technology (NIST) Fluid Metrology Group to provide flow meter calibrations for customers. The 0.1 L/s and 2.5 L/s flow standards measure flow by moving a piston of known cross-sectional area over a measured length during a measured time. The 0.1 L/s standard uses a passive piston prover technique where fluid is driven by a pump that in turn moves the piston. The 2.5 L/s standard uses a variable speed motor and drive screw to move the piston and thereby move the fluid through the system. The fluid medium used in these standards is a propylene glycol and water mixture that has kinematic viscosity of approximately 1.2 cSt at 21 °C (1 cSt = 1 x 10-6 m 2 /s), but the ratio of propylene glycol to water can be altered to offer a range of fluid properties. The 0.1 L/s standard has an expanded uncertainty of ± 0.044 %, spanning the flow range 0.003 L/s to 0.1 L/s (0.05 gal/min to 1.5 gal/min). The 2.5 L/s standard has an expanded uncertainty of ± 0.064 %, spanning the flow range 0.02 L/s to 2.0 L/s (0.3 gal/min to 31 gal/min) (Here, expanded uncertainties correspond to a 95 % confidence level). This document provides an overview of the liquid flow calibration service and the procedures for customers to submit their flow meters to NIST for calibration. We derive the equation for calculating flow at the meter under test, including the corrections for storage effects caused by changes in fluid density in the connecting volume (due to temperature changes). Finally, we analyze the uncertainty of the flow standards, give supporting data, and provide a sample calibra tion report.

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Section: Fluid Propertiesmentioning

confidence: 99%

mentioning

confidence: 99%

Liquid Flow Meter Calibrations with the 0.1 L/s and the 2.5 L/s Piston Provers

Pope¹,

Wright²,

Johnson³

et al. 2013

Self Cite

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“…This is of particular importance at low Re for the considerable influence of mechanical and viscosity drags. A variety of ways for presenting turbine meter calibration results as well as calibration methods are analysed and applied [5][6][7][8][9]. The construction of new calibration facilities operating at high gas pressure or using alternate test fluids are developing.…”

Section: Introductionmentioning

confidence: 99%

Influence of Gas and Liquid Viscosity on Turbine and Positive Displacement Meters Calibration

Pedišius

Zygmantas

Maslauskas

2015

17th International Congress of Metrology

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L'article présente une étude de l'impact de la viscosité des liquides et des gaz sur les erreurs de mesure des débitmètresrotatifs à palette et à turbine. Deux débitmètres rotatifs à palette ont été étudiés en laboratoire et en conditions réelles dans les flux de quatre fluides de viscosité différente Q = (0,73-4,6) mm 2 /s, ainsi que quatre types dedébitmètres à turbine dans un flux d'air (gaz) de pression atmosphérique ou augmentée (Q = (0,44-2,74) mm 2 /s). Les variations d'erreurs des débitmètres ont été analysées en utilisant le critère de similitude Re. Les deux intervalles de variation des erreurs des débitmètres, qui diffèrent par leur valeur d'erreur maximale, ont été distinguésen fonction deRe. Avant cette valeur d'erreur maximale, lorsque le débit augmente, l'impact de la friction mécanique et de la viscosité diminue graduellement,un déplacement est observé des erreurs vers des valeurs positives plus grandes jusqu'à ce que le débitatteigne le régime de turbulence. Le changement des erreurs selon la loi universelle de dépendance deRevers des valeurs négatives plus grandeset le déplacement des erreursvers des valeurs asymptotiques est typiqueau régime de débit de turbulence. L'article traiteles raisons de ces régularités. Il montre également que, malgré des différents principes de fonctionnement des débitmètres à pale rotatifs et à turbine, la dépendance des erreursdeReest similaire et une prévision de variations des erreurs après un changement des conditions du flux est possible.

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“…Experimentally most investigated was the measurement accuracy of turbine meters under the influence of different factors, including viscosity of liquid or gas. The most significant result of these investigations is the identification of universal pattern, which links meter factor with rotation frequency and kinematic viscosity [11,12] as well as acceptance of Re number as distinctive parameter for the process characterization.…”

Section: Introductionmentioning

confidence: 99%