Uncertainty and traceability for the CEESI Iowa natural gas facility

Johnson, Aaron N.; Kegel, Tom

doi:10.6028/jres.109.026

Cited by 8 publications

(4 citation statements)

References 8 publications

(11 reference statements)

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“…Operating pressure is 7174 kPa and operating temperature is ambient temperature. The research resulted uncertainty of flow rate is 0.28% to 0.30% dependent on natural gas flow rate [6].…”

Section: Introductionmentioning

confidence: 90%

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Chemical Composition Effects on Enthalpy Uncertainty in Natural Gas Energy Measurement System Using Orifice Meter in a Non-adiabatic Condition

Marto¹,

Tjokronegoro²,

Leksono³

et al. 2014

IJP

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This paper explainsan enthalpy uncertainty ofnatural gas energy measurement (custody transfer) using orifice meter in non adiabatic condition. The method of uncertainty analysis used in this paper was developed based on theuncertainty analysis of natural gas flow measurement using orifice meter at adiabatic condition based on AGA 3, 1992 (which reference by No 10.). In addition of non adiabatic condition includes: critical pressure, critical temperature, realtime pressure, realtime temperature and generalized correlation constanta. The measurement of enthalpy uncertaintyis referring to the Guide to the Eexpression of Uncertainty Measurementof the Guide in MetrologyWorking Group 1 of Joint Committee for Guide In Metrology, 2011. Based on the energy flow in orifice meter is 1000 Mmbtud, The combined uncertainty of f enthalpy is 3.86 x 10-7 Mmbtud (3.86 x 10-8 %) while the expandeduncertainty analysis results 7.73 x 10-7 Mmbtud (7.73 x 10-8 %)with confidence level 95%. This number of uncertaintyis smaller than the Measurement Permissive Error specified by legal metrology organization 0.1667%.

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“…Operating pressure is 7174 kPa and operating temperature is ambient temperature. The research resulted uncertainty of flow rate is 0.28% to 0.30% dependent on natural gas flow rate [6].…”

Section: Introductionmentioning

confidence: 90%

“…Colorado Experimental Engineering Station Incorporated [6] (CESSI) has done a research on natural gas flow rate using 9 turbine meters. The standard of flow rate in CESSI facility is traceable to NIST.…”

Section: Introductionmentioning

confidence: 99%

Chemical Composition Effects on Enthalpy Uncertainty in Natural Gas Energy Measurement System Using Orifice Meter in a Non-adiabatic Condition

Marto¹,

Tjokronegoro²,

Leksono³

et al. 2014

IJP

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“…The U.S. national standard for natural gas flow is traceable to a pressure-volume-temperature-time (PVTt) system. Natural gas calibrations are done using an array of turbine meter working standards that are traceable to the PVTt system through a complex scale-up procedure using parallel arrays of critical flow venturis [4,5,6]. The turbine meters are housed and maintained at the CEESI Iowa flow facility in Garner, Iowa, while the PVTt standard is located on NIST campus in Gaithersburg, Maryland.…”

Section: Traceability Chains Of Ptb and Nistmentioning

confidence: 99%

“…Therefore NIST participated in a bilateral comparison with PTB after commissioning its calibration service in 2009. The results of the bilateral comparison are linked to the 2006 key comparison results (herein referred to as CCM.FF-K5a) 4 between PTB, VSL, and LNE. Linkage to the previous key comparison is achieved by accounting for 1) PTB's results in the previous key comparison, 2) the difference between the results of NIST and PTB in this subsequent bilateral comparison, and 3) the long term stability of PTB's flow standards.…”

Section: Introductionmentioning

confidence: 99%

Final results of bilateral comparison between NIST and PTB for flows of high pressure natural gas

Mickan¹,

Toebben²,

Johnson³

et al. 2013

Metrologia

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In 2009 NIST developed a U.S. national flow standard to provide traceability for flow meters used for custody transfer of pipeline quality natural gas. NIST disseminates the SI unit of flow by calibrating a customer flow meter against a parallel array of turbine meter working standards, which in turn are traceable to a pressure-volumetemperature-time (PVTt) primary standard. The calibration flow range extends from 0.125 actual m 3 /s to 9 actual m 3 /s with an expanded uncertainty as low as 0.22 % at high flows, and increasing to almost 0.40 % at the lowest flows. Details regarding the traceability chain and uncertainty analysis are documented in prior publications. The current manuscript verifies NIST's calibration uncertainty via a bilateral comparison with the German national metrology institute PTB. The results of the bilateral are linked to the 2006 key comparison results between three EURAMET national metrology institutes (i.e., PTB, VSL, and LNE). Linkage is accomplished in spite of using a different transfer standard in the bilateral versus the key comparison. A mathematical proof is included that demonstrates that the relative difference between a laboratory's measured flow and the key comparison reference value is independent of the transfer package for most flow measurement applications. The bilateral results demonstrate that NIST's natural gas flow measurements are within their specified uncertainty and are equivalent the EURAMET national metrology institutes. 1 Physikalisch-Technische Bundesanstalt 2 Van Swinden Laboratorium (sometimes abbreviated NMi-VSL, or NMi). 3 Laboratoire National d'Essais 4 The acronym CCM.FF-K5a is the name used for key comparisons in the area of high pressure natural gas. Numeric extensions appended to this acronym such as CCM.FF-K5a.1 and CCM.FF-K5a.2 denote bilateral comparisons subsequent to the key comparison. For example, CCM.FF-K5a.1 is a bilateral comparison between PTB and the secondary laboratory TransCanda Calibrations Ltd. while CCM.FF-K5a.2 is the bilateral comparison between PTB and NIST described in this manuscript.

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