ISO 6974-2:2012
Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 2: Uncertainty calculations
This part of ISO 6974 describes the process required to determine the uncertainty associated with the mole
fraction for each component from a natural gas analysis in accordance with ISO 6974‑1.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
4.1 Symbols
4.2 Subscripts
5 Calculation of uncertainty
5.1 General considerations
5.2 Principles
5.3 Step 9 — Calculation of uncertainty of mole fractions
5.4 Step 10 — Calculation of the expanded uncertainty of mole fractions
Annex A (informative) Calculation of processed component uncertainties for the methane‑by‑difference approach
Annex B (normative) Uncertainties of relative response factors
Annex C (informative) Alternative calculation of the uncertainty of the value of the unknown
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
4.1 Symbols
4.2 Subscripts
5 Calculation of uncertainty
5.1 General considerations
5.2 Principles
5.3 Step 9 — Calculation of uncertainty of mole fractions
5.4 Step 10 — Calculation of the expanded uncertainty of mole fractions
Annex A (informative) Calculation of processed component uncertainties for the methane‑by‑difference approach
Annex B (normative) Uncertainties of relative response factors
Annex C (informative) Alternative calculation of the uncertainty of the value of the unknown
Bibliography