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A study on quality assurance and evaluation of uncertainty for the analysis of natural gas
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2006, v.19 no.6, pp.490-497
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(2006). A study on quality assurance and evaluation of uncertainty for the analysis of natural gas. Analytical Science and Technology, 19(6), 490-497.
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Abstract
The sources of uncertainty in the analysis of liquified natural gas (LNG) process are evaluated. The uncertainty sources evaluated are the repeatability of measurement, non-linearity of GC, the uncertainty of standard gas used for calibration, difference of gas sampling and deviation after GC calibration and major revealed sources are the non-linearity of GC, the uncertainty of standard gas and the deviation after GC calibration. The determined values and uncertainties of methane and ethane as the major components are <TEX>$90.0%mol/mol{\pm}1.9%$</TEX> (relative and 95% level of confidence) and <TEX>$6.26%mol/mol{\pm}0.08$</TEX> (relative and 95% level of confidence), respectively. The contribution of uncertainty varies depending on the source of uncertainty and gas component. In the case of methane, non-linearity of GC, the uncertainty of standard gas and deviation after GC calibration contribute 0.28%, 0.25% and 0.24% of relative expanded uncertainty, respectively.
- keywords
- Analysis of LNG, quality assurance, measurement uncertainty, gas CRM, non-lineality, drift, sampling
Reference
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ISO, Natural Gas-Calculation of calorific values, density, relative density and Wobbe index from composition ,ISO 6976 ,
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우진춘, (2005) Anal. Sci. & Tech. ,
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ISO, Natural Gas-Sampling guidelines , ISO 10715 ,
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ISO, (1993) Guide to the Expression of Uncertainty in Measurements ,
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한국표준과학연구원, (1999) KRISS-99-070-SP ,
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ISO, Certification of reference materials-General and statistical principles, ISO Guide 35. ,
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