NF EN ISO 6974-2

NF EN ISO 6974-2

August 2012
Standard Current

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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National standards and national normative documents

Publication date

August 2012

Number of pages

23 p.

Reference

NF EN ISO 6974-2

ICS Codes

75.060   Natural gas

Classification index

X20-510-2

Print number

1 - 26/07/2012

International kinship

ISO 6974-2:2012

European kinship

EN ISO 6974-2:2012
Sumary
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.

Replaced standards (2)
NF EN ISO 6974-1
August 2003
Standard Cancelled
Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 1 : guidelines for tailored analysis

L'ISO 6974-1:2000 donne les lignes directrices pour l'analyse quantitative des constituants du gaz naturel dans les limites des gammes d'application indiquées au Tableau 1 de l'ISO 6974-1:2000.

NF EN ISO 6974-2
May 2004
Standard Cancelled
Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 2 : Measuring-system characteristics and statistics for processing of data

L'ISO 6974-2:2001 décrit le traitement des données pour l'analyse sur mesure du gaz naturel. Elle comprend la détermination des caractéristiques du système de mesurage et de l'approche statistique pour le traitement des données et le calcul des erreurs, avec pour objectif la définition de l'incertitude des fractions molaires du constituant mesuré. L'ISO 6974-2:2001 n'est applicable que conjointement avec l'ISO 6974-1.

Table of contents
  • Avant-propos
    iv
  • Introduction
    v
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    1
  • 4 Symboles
    1
  • 4.1 Symboles
    1
  • 4.2 Indices
    2
  • 5 Calcul de l'incertitude
    2
  • 5.1 Considérations générales
    2
  • 5.2 Principes
    4
  • 5.3 Étape 9 - Calcul de l'incertitude des fractions molaires
    5
  • 5.4 Étape 10 - Calcul de l'incertitude étendue des fractions molaires
    10
  • Annexe A (informative) Calcul des incertitudes des constituants traités par l'approche méthane par différence
    11
  • Annexe B (normative) Incertitudes des facteurs de réponse relatifs
    12
  • Annexe C (informative) Calcul alternatif de l'incertitude de la valeur de l'inconnue
    13
  • Bibliographie
    15
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