EN ISO 6974-5:2014

Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons (ISO 6974-5:2014)

ISO 6974-5:2014 describes a gas chromatographic method for the quantitative determination of the content of nitrogen, carbon dioxide and C1 to C5 hydrocarbons individually and a composite C6+ measurement, which represents all hydrocarbons of carbon number 6 and above in natural gas samples.

Erdgas - Bestimmung der Zusammensetzung und der zugehörigen Unsicherheit durch Gaschromatographie - Teil 5: Isothermes Verfahren für Stickstoff, Kohlenstoffdioxid, C1- bis C5-Kohlenwasserstoffe und C6+-Kohlenwasserstoffe (ISO 6974-5:2014)

Dieser Teil dieser Internationalen Norm beschreibt ein gaschromatographisches Verfahren zur quantitativen Bestimmung des Gehalts an Stickstoff, Kohlenstoffdioxid und der individuellen C1- bis C5-Kohlenwasserstoffe und einer C6+-Verbundmessung, die alle Kohlenwasserstoffe mit sechs und mehr Kohlenwasserstoffatomen in Erdgasproben repräsentiert. Es ist anwendbar zur Analyse von Gasen, deren Bestandteile in den in Tabelle 1 angegebenen Arbeitsbereichen liegen.
Tabelle 1 - Messbereiche der Komponenten

Gaz naturel - Détermination de la composition et de l'incertitude associée par chromatographie en phase gazeuse - Partie 5: Méthode isotherme pour l'azote, le dioxyde de carbone, les hydrocarbures C1 à C5 et C6+ (ISO 6974-5:2014)

L'ISO 6974-5:2014 décrit une méthode chromatographique en phase gazeuse pour la détermination quantitative de la teneur en azote, du dioxyde de carbone et des hydrocarbures C1 à C5 individuellement, et une mesure composite des C6+ qui représente tous les hydrocarbures de 6 atomes de carbone et plus dans des échantillons de gaz naturel.

Zemeljski plin - Ugotavljanje sestave in pripadajoče negotovosti s plinsko kromatografijo - 5. del: Izotermična metoda za dušik, ogljikov dioksid, ogljikovodike C1 do C5 in ogljikovodike C6+ (ISO 6974-5:2014)

Standard EN ISO 6974-5 opisuje metodo s plinsko kromatografijo za kvantitativno ugotavljanje vsebnosti dušika, ogljikovega dioksida in posameznih ogljikovodikov C1 do C5 ter sestavljeno merjenje ogljikovodikov C6+, ki zajema vse ogljikovodike s številko 6 in več v vzorcih zemeljskega plina. Uporablja se za analizo plinov, ki vsebujejo sestavine v znotraj delovnih območij iz tabele 1.

General Information

• Status: Published
• Publication Date: 15-Jul-2014
• 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: 16-Jul-2014
• Completion Date: 16-Jul-2014
• Ref Project: SIST EN ISO 6974-5:2014 - Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons (ISO 6974-5:2014)

Relations

• Replaces: EN ISO 6974-5:2001 - Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 5: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line process application using three columns (ISO 6974-5:2000)
• Effective Date: 23-Jul-2014

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2014
1DGRPHãþD
SIST EN ISO 6974-5:2001
=HPHOMVNLSOLQ8JRWDYOMDQMHVHVWDYHLQSULSDGDMRþHQHJRWRYRVWLVSOLQVNR
NURPDWRJUDILMRGHO,]RWHUPLþQDPHWRGD]DGXãLNRJOMLNRYGLRNVLG
RJOMLNRYRGLNH&GR&LQRJOMLNRYRGLNH&,62
Natural gas - Determination of composition and associated uncertainty by gas
chromatography - Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5
hydrocarbons and C6+ hydrocarbons (ISO 6974-5:2014)
Erdgas - Bestimmung der Zusammensetzung und der zugehörigen Unsicherheit durch
Gaschromatographie - Teil 5: Isothermes Verfahren für Stickstoff, Kohlenstoffdioxid, C1-
bis C5-Kohlenwasserstoffe und C6+-Kohlenwasserstoffe (ISO 6974-5:2014)
*D]QDWXUHO'pWHUPLQDWLRQGHODFRPSRVLWLRQHWXQHLQFHUWLWXGHGpILQLHSDU
FKURPDWRJUDSKLHHQSKDVHJD]HXVH3DUWLH0pWKRGHLVRWKHUPHSRXUO
D]RWHOH
GLR[\GHGH
FDUERQHOHVK\GURFDUEXUHV&j&HW&,62
Ta slovenski standard je istoveten z: EN ISO 6974-5:2014
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 6974-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2014
ICS 75.060 Supersedes EN ISO 6974-5:2001
English Version
Natural gas - Determination of composition and associated
uncertainty by gas chromatography - Part 5: Isothermal method
for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+
hydrocarbons (ISO 6974-5:2014)
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 5: Méthode isotherme pour l'azote, le 5: Isothermes Verfahren für Stickstoff, Kohlenstoffdioxid,
dioxyde de carbone, les hydrocarbures C1 à C5 et C6+ C1- bis C5-Kohlenwasserstoffe und C6+-
(ISO 6974-5:2014) Kohlenwasserstoffe (ISO 6974-5:2014)
This European Standard was approved by CEN on 28 June 2014.

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, Former Yugoslav Republic of Macedonia, 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

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6974-5:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 6974-5:2014) 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 January 2015, and conflicting national standards shall be withdrawn at
the latest by January 2015.
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 6974-5:2001.
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, Former Yugoslav Republic of Macedonia, 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 6974-5:2014 has been approved by CEN as EN ISO 6974-5:2014 without any modification.
INTERNATIONAL ISO
STANDARD 6974-5
Second edition
2014-07-15
Natural gas — Determination
of composition and associated
uncertainty by gas chromatography —
Part 5:
Isothermal method for nitrogen,
carbon dioxide, C to C hydrocarbons
1 5
and C hydrocarbons
6+
Gaz naturel — Détermination de la composition et de l’incertitude
associée par chromatographie en phase gazeuse —
Partie 5: Méthode isotherme pour l’azote, le dioxyde de carbone, les
hydrocarbures C à C et C
1 5 6+
Reference number
ISO 6974-5:2014(E)
©
ISO 2014
ISO 6974-5:2014(E)
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested 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 2014 – All rights reserved

ISO 6974-5:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Principle . 2
4 Materials . 4
5 Apparatus . 4
6 Scheme of the configuration . 6
7 Procedure. 7
7.1 Control of the apparatus . 7
7.2 Operation of the apparatus . 8
8 Expression of results .11
8.1 Uncertainty .11
8.2 Test report .11
Annex A (informative) Example of application .12
Annex B (informative) Procedure for Setting Valve timings and Restrictor Setting .22
Bibliography .24
ISO 6974-5:2014(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 www.iso.org/directives.
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. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received www.iso.org/patents.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT), see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 193, Natural Gas, Subcommittee SC 1, Analysis
of Natural Gas.
This second edition cancels and replaces the first edition (ISO 6974-5:2000).
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 C8
using two capillary columns and one packed column
— Part 4: Determination of nitrogen, carbon dioxide and C to C and C + hydrocarbons for a laboratory
1 5 6
and on-line measuring system using two columns
— Part 5: Isothermal method for nitrogen, carbon dioxide, C to C hydrocarbons and C + hydrocarbons
1 5 6
— Part 6: Determination of helium, oxygen, nitrogen, carbon dioxide and C to C hydrocarbons using three
1 8
capillary columns
iv © ISO 2014 – All rights reserved

ISO 6974-5:2014(E)
Introduction
This part of ISO 6974 describes a method for the analysis of natural gas that is commonly used for online
process applications, but can be applied to laboratory instruments. The compositional data obtained are
used for the calculation of calorific value, density and Wobbe index.
It is assumed that the natural gas does not contain any oxygen at source and that any oxygen which may
be present is due to contamination during sampling.
The primary use of this chromatographic method is the calculation of calorific value (CV) according
to ISO 6976. It is based on a column switching technique in which multiple columns, chosen for their
separating ability for particular groups of components, are switched under automatic control.
Only one injection is necessary and the first phase of the method involves accelerated backflush of C +
(which is measured as a recombined “pseudo component” rather than by the summation of individual
component measurements). Lighter components (nitrogen, methane, carbon dioxide and ethane) are
stored on the appropriate separating column while the heavier, C to C hydrocarbons are eluted. The
3 5
lighter components are then separated by redirecting carrier gas on to the appropriate column.
A Thermal Conductivity Detector (TCD) is used for measurement of the above components.
When the method is first set up, the rep
...