EN ISO 6974-1:2012

Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 1: General guidelines and calculation of composition (ISO 6974-1:2012)

2011-04-08 EMA: Draft for // final vote received in ISO/CS (see notification of 2011-04-06 in dataservice).

Erdgas - Bestimmung der Zusammensetzung und der zugehörigen Unsicherheit durch Gaschromatographie - Teil 1: Allgemeine Leitlinien und Berechnung der Zusammensetzung (ISO 6974-1:2012)

Dieser Teil von ISO 6974 gibt Verfahren für die Berechnung von Komponenten-Molfraktionen von Erdgas vor und legt Anforderungen an die Datenverarbeitung zur Bestimmung der Komponenten-Molfraktionen fest. Dieser Teil von ISO 6974 deckt sowohl Einfach- und Mehrfachbestimmung als auch und entweder Mehrpunktkalibrierung oder eine Leistungsbewertung des Analysegerätes, gefolgt von einer Einpunktkalibrierung, ab. Dieser Teil von ISO 6874 enthält Verfahrensweisen für die Berechnung der unbearbeiteten und der bearbeiteten (z. B. normalisierten) Molfraktionen sowie der zugehörigen Unsicherheiten für alle Komponenten. Die in diesem Teil von ISO 6974 enthaltenen Verfahrensweisen sind anwendbar, um Daten aus Wiederhol  oder Einzelanalysen von Erdgasproben zu bearbeiten.

Gaz naturel - Détermination de la composition et de l'incertitude associée par chromatographie en phase gazeuse - Partie 1: Lignes directrices générales et calcul de la composition (ISO 6974-1:2012)

L'ISO 6974-1:2012 donne des méthodes de calcul des fractions molaires des constituants du gaz naturel et spécifie les exigences de traitement des données pour déterminer les fractions molaires des constituants.
L'ISO 6974-1:2012 fournit à la fois des méthodes d'analyse unique et multiple, mais aussi un étalonnage multipoint, ou une évaluation des performances de l'analyseur suivie d'un étalonnage en un seul point.
L'ISO 6974‑1:2012 indique les procédures pour le calcul des fractions molaires brutes et traitées (par exemple normalisées), et des incertitudes associées, pour tous les constituants. Les procédures données dans l'ISO 6974‑1:2012 s'appliquent au traitement des données obtenues à partir d'analyses uniques ou répétées d'un échantillon de gaz naturel.

Zemeljski plin - Določevanje sestave in pripadajoče negotovosti s plinsko kromatografijo - 1. del: Splošne smernice in računanje sestave (ISO 6974-1:2012)

Ta del standarda ISO 6974 določa metode za računanje molskih frakcij sestavin zemeljskega plina in določa zahteve za obdelavo podatkov za določevanje molskih frakcij sestavin. Ta del standarda ISO 6974 določa posamezne in večkratne operacijske metode ter bodisi večtočkovno umerjanje bodisi delovno oceno analizatorja, ki ji sledi enotočkovno umerjanje. Ta del standarda ISO 6974 določa postopke za računanje surovih in predelanih (tj. normaliziranih) molskih frakcij in njihovih povezanih negotovosti za vse sestavine. Postopki iz tega dela standarda ISO 6974 se uporabljajo za obdelavo podatkov iz ponovljenih ali posameznih analiz vzorca zemeljskega plina.

General Information

• Status: Published
• Publication Date: 14-May-2012
• Withdrawal Date: 29-Nov-2012
• ICS: 75.060 - Natural gas
• Technical Committee: CEN/TC 238 - Test gases, test pressures and categories of appliances
• Drafting Committee: CEN/SS N21 - Gaseous fuels and combustible gas
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-May-2012
• Completion Date: 15-May-2012
• Ref Project: SIST EN ISO 6974-1:2012 - Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 1: General guidelines and calculation of composition (ISO 6974-1:2012)

Relations

• Replaces: EN ISO 6974-1:2001 - Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 1: Guidelines for tailored analysis (ISO 6974-1:2000)
• Effective Date: 30-May-2012
• Corrected By: EN ISO 6974-1:2012/AC:2012 - Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 1: General guidelines and calculation of composition - Technical Corrigendum 1 (ISO 6974-1:2012/Cor 1:2012)
• Effective Date: 21-Nov-2012

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2012
1DGRPHãþD
SIST EN ISO 6974-1:2001
=HPHOMVNLSOLQ'RORþHYDQMHVHVWDYHLQSULSDGDMRþHQHJRWRYRVWLVSOLQVNR
NURPDWRJUDILMRGHO6SORãQHVPHUQLFHLQUDþXQDQMHVHVWDYH,62
Natural gas - Determination of composition and associated uncertainty by gas
chromatography - Part 1: General guidelines and calculation of composition (ISO 6974-
1:2012)
Erdgas - Bestimmung der Zusammensetzung und der zugehörigen Unsicherheit durch
Gaschromatographie - Teil 1: Allgemeine Leitlinien und Berechnung der
Zusammensetzung (ISO 6974-1:2012)
Gaz naturel - Détermination de la composition avec une incertitude définie par
chromatographie en phase gazeuse - Partie 1: Lignes directrices générales et calculs de
la composition (ISO 6974-1:2012)
Ta slovenski standard je istoveten z: EN ISO 6974-1:2012
ICS:
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 6974-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2012
ICS 75.060 Supersedes EN ISO 6974-1:2001
English Version
Natural gas - Determination of composition and associated
uncertainty by gas chromatography - Part 1: General guidelines
and calculation of composition (ISO 6974-1:2012)
Gaz naturel - Détermination de la composition et de Erdgas - Bestimmung der Zusammensetzung und der
l'incertitude associée par chromatographie en phase zugehörigen Unsicherheit durch Gaschromatographie - Teil
gazeuse - Partie 1: Lignes directrices générales et calcul 1: Allgemeine Leitlinien und Berechnung der
de la composition (ISO 6974-1:2012) Zusammensetzung (ISO 6974-1:2012)
This European Standard was approved by CEN on 14 May 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6974-1:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 6974-1:2012) has been prepared by Technical Committee ISO/TC 193 "Natural gas".
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by November 2012, and conflicting national standards shall be withdrawn
at the latest by November 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 6974-1:2001.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 6974-1:2012 has been approved by CEN as a EN ISO 6974-1:2012 without any modification.

INTERNATIONAL ISO
STANDARD 6974-1
Second edition
2012-05-15
Natural gas — Determination of
composition and associated uncertainty
by gas chromatography —
Part 1:
General guidelines and calculation of
composition
Gaz naturel — Détermination de la composition et de l’incertitude
associée par chromatographie en phase gazeuse —
Partie 1: Lignes directrices générales et calcul de la composition
Reference number
ISO 6974-1:2012(E)
©
ISO 2012
ISO 6974-1:2012(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO 6974-1:2012(E)
Contents Page
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 5
4.1 Symbols . 5
4.2 Subscripts . 6
5 Principles of analysis . 6
5.1 General considerations . 6
5.2 Method of operation. 7
5.3 Mode of operation . 8
5.4 Directly and indirectly measured components . 8
5.5 Normalization . 8
6 Analytical procedure . 8
6.1 General considerations . 8
6.2 Step 1 — Defining the working range .10
6.3 Step 2 — Defining the requirements of the analytical method . 11
6.4 Step 3 — Selecting equipment and working conditions . 11
6.5 Step 4 — Response characteristics (primary calibration or performance evaluation) .12
6.6 Step 5 — Relative response factors .15
6.7 Step 6 — Routine calibration/quality assurance check .16
6.8 Step 7 — Analysis of samples .17
6.9 Step 8 — Calculation of component mole fractions .18
7 Control chart .21
8 Test report .21
Annex A (informative) Comparative application ranges and characteristics of analytical methods
described in ISO 6974-3 to ISO 6974-6 .23
Annex B (informative) Alternative approach to bridging and normalization .25
Annex C (informative) Methane-by-difference approach .32
Annex D (normative) Relative response factors .33
Annex E (informative) Testing for outliers .35
Annex F (normative) Pressure correction during calibration and sample analysis .36
Annex G (informative) Software suitable for generalized least squares regression analysis .38
Annex H (informative) Use of control charts .40
Bibliography .41
ISO 6974-1:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6974-1 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis
of natural gas.
This second edition of ISO 6974-1, together with ISO 6974-2:2012, cancels and replaces ISO 6974-1:2000 and
ISO 6974-2:2001, which have been technically revised.
ISO 6974 consists of the following parts, under the general title Natural gas — Determination of composition
and associated uncertainty by gas chromatography:
— Part 1: General guidelines and calculation of composition
— Part 2: Uncertainty calculations
— Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C
using two packed columns
— Part 4: Determination of nitrogen, carbon dioxide and C to C and C hydrocarbons for a laboratory and
1 5 6+
on-line measuring system using two columns
— Part 5: Determination of nitrogen, carbon dioxide and C to C and C hydrocarbons for a laboratory and
1 5 6+
on-line process application using three columns
— Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C to C hydrocarbons
1 8
using three capillary columns
Future subsequent parts of ISO 6974 are planned.
iv © ISO 2012 – All rights reserved

ISO 6974-1:2012(E)
Introduction
ISO 6974 describes methods of analysis of natural gas and methods for calculating component mole fractions
and uncertainties. ISO 6974 is intended for the measurement of H , He, O , N , CO and hydrocarbons, either as
2 2 2 2
individual components or as a group, for example all hydrocarbons above C , defined as C . This approach is
5 6+
suitable for a range o
...