EN ISO 6975:2005
(Main)Natural gas - Extended analysis - Gas-chromatographic method (ISO 6975:1997)
Natural gas - Extended analysis - Gas-chromatographic method (ISO 6975:1997)
describes the method of test to determine the stability of transmission performance of a finished cable used in analogue and digital communication systems when submitted to temperature changes which may occur during use, storage or transportation.
Erdgas - Erweiterte Analyse - Gaschromatographisches Verfahren (ISO 6975:1997)
Diese Internationale Norm beschreibt die Anforderungen für die quantitative Analyse der folgenden Erdgaskomponenten:
Helium
Wasserstoff
Argon
Sauerstoff
Stickstoff
Kohlenstoffdioxid
gesättigte Kohlenwasserstoffe von C1 bis C5
Kohlenwasserstofffraktionen ab C6 aufwärts
aromatische Verbindungen wie Benzol und Toluol.
Die gaschromatographischen Verfahren bestimmen diese Komponenten in den folgenden Gehaltsbereichen:
Sauerstoff: 0,001 % (n/n) bis 0,5 % (n/n)
Helium: 0,001 % (n/n) bis 0,5 % (n/n)
Wasserstoff: 0,001 % (n/n) bis 0,5 % (n/n)
Argon: 0,001 % (n/n) bis 0,5 % (n/n)
Stickstoff: 0,001 % (n/n) bis 40 % (n/n)
Kohlenstoffdioxid: 0,001 % (n/n) bis 40 % (n/n)
Methan: 0,001 % (n/n) bis 100 % (n/n)
Ethan: 0,02 % (n/n) bis 15 % (n/n)
Propan: 0,001 % (n/n) bis 5 % (n/n)
höhere Kohlenwasserstoffe: Das Verfahren kann Kohlenwasserstoffkomponenten ab einer Konzentration von 10-6 (n/n) bis zur jeweiligen Maximalkonzentration messen, was mit der Anforderung in Einklang steht, dass das Gas bei beliebigem Druck im Bereich zwischen 1 ´ 10² kPa und 7 ´ 10³ kPa frei von Kohlenwasserstoffkondensaten ist.
Dieses Verfahren ist nicht dazu ausgelegt, Sauerstoff- (Wasserdampf, Methanol, Glykole) und Schwefelverbindungen zu bestimmen.
Die Möglichkeit zur eindeutigen Identifizierung von Kohlenwasserstoffen oberhalb C6 ist nicht gegeben. Selbst wenn durch das "Spiking" eines Gases mit bekannten Komponenten aufgezeigt werden kann, an welcher Stelle deren Elution stattfindet, kann nicht mit Sicherheit behauptet werden, dass diese Komponente die einzige mit der jeweils in Rede stehenden Retentionszeit ist. Nicht identifizierte Komponenten werden entsprechend jener Kohlenstoffzahl klassifiziert, die aufgrund der Analyse als angemessen anzusehen ist. Dies stellt zwar eine notwendige Vereinfachung dar, erlaubt jedoch die Gewinnung vernünftiger quantitativer Werte.
Dieses Verfahren ist für den Einsatz in Fällen vorgesehen, in denen eine Analyse der Hexane und höheren Kohlenwa
Gaz naturel - Analyse étendue - Méthode par chromatographie en phase gazeuse (ISO 6975:1997)
La présente Norme internationale fixe les spécifications relatives à l'analyse quantitative des constituants suivants du gaz naturel:
hélium
hydrogène
argon
oxygène
azote
dioxyde de carbone
hydrocarbures saturés de C1 à C5
fractions d'hydrocarbures, C6 et supérieurs
composés aromatiques tels que le benzène et le toluène
Les méthodes de chromatographie en phase gazeuse permettent de déterminer
les constituants dans les gammes suivantes:
oxygène: 0,001 % (n/n) à 0,5 % (n/n)
hélium: 0,001 % (n/n) à 0,5 % (n/n)
hydrogène: 0,001 % (n/n) à 0,5 % (n/n)
argon: 0,001 % (n/n) à 0,5 % (n/n)
azote: 0,001 % (n/n) à 40 % (n/n)
dioxyde de carbone: 0,001 % (n/n) à 40 % (n/n)
méthane: 50 % (n/n) à 100 % (n/n)
éthane: 0,02 % (n/n) à 15 % (n/n)
propane: 0,001 % (n/n) à 5 % (n/n)
hydrocarbures supérieurs: la méthode peut mesurer les constituants
depuis 10-6 (n/n) jusqu'à leur concentration maximale compatible
avec la prescription selon laquelle le gaz ne doit contenir aucun condensat
d'hydrocarbure, à n'importe quelle pression, dans la gamme 1 x 102
kPa à 7 x 103 kPa.
Cette méthode n'est pas destinée à identifier les composés
oxygénés (la vapeur d'eau, le méthanol, les glycols) et les
composés sulfurés. Il est impossible que l'identification des hydrocarbures
supérieurs à C6 soit ambiguë. Même lorsqu'un
pic indique le point d'élution des constituants connus d'un mélange
gazeux, on ne peut pas établir avec certitude que ce constituant est le
seul qui présente ce temps de rétention. Les constituants non identifiés
sont classés selon l'indice de carbone qui est apparu approprié
suite à l'analyse. Bien que cette simplification soit nécessaire,
elle permet d'obtenir une valeur quantitative convenable. Cette méthode
est à utiliser lorsqu'on désire analyser la composition des hexanes+
et/ou effectuer une analyse
complète.
La méthode n'est pas destinée à des gaz en phase dense dont
la pression dépasse le cricondebar (pression de condensation critique)
ou, pour des échantillons de gaz ne contenant aucun condensat d'hydrocarbures
en quantité mesurable, de l'eau à I'état liquide ou de fluide
de traitement comme le méthanol ou les glycols (voir ISO 6570-1 et ISO
10715).
II est peu vraisemblable que les gaz traités en vue de leur transport contiennent
une proportion décelable d'hydrocarbures supérieurs à C12.
Les échantillons prélevés plus près de la tête
de puits peuvent contenir, avant leur passage par l'usine de traitement, des hydrocarbures
allant jusqu'a cl6 ou au-delà.
Zemeljski plin – Širše analize – Plinsko-kromatografska metoda (ISO 6975:1997)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2005
Zemeljski plin – Širše analize – Plinsko-kromatografska metoda (ISO 6975:1997)
Natural gas - Extended analysis - Gas-chromatographic method (ISO 6975:1997)
Erdgas - Erweiterte Analyse - Gaschromatographisches Verfahren (ISO 6975:1997)
Gaz naturel - Analyse étendue - Méthode par chromatographie en phase gazeuse (ISO
6975:1997)
Ta slovenski standard je istoveten z: EN ISO 6975:2005
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 6975
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 75.060
English version
Natural gas - Extended analysis - Gas-chromatographic method
(ISO 6975:1997)
Gaz naturel - Analyse étendue - Méthode par Erdgas - Erweiterte Analyse - Gaschromatographisches
chromatographie en phase gazeuse (ISO 6975:1997) Verfahren (ISO 6975:1997)
This European Standard was approved by CEN on 17 April 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6975:2005: E
worldwide for CEN national Members.
Foreword
The text of ISO 6975:1997 has been prepared by Technical Committee ISO/TC 193 "Natural
gas” of the International Organization for Standardization (ISO) and has been taken over as EN
ISO 6975:2005 by CMC.
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 2005, and conflicting national
standards shall be withdrawn at the latest by November 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 6975:1997 has been approved by CEN as EN ISO 6975:2005 without any
modifications.
INTERNATIONAL
STANDARD
Second edition
1997-04-O 1
- Extended analysis -
Natural gas
Gas-chromatographic method
M&hode par chromatographie
Gaz nature/ - Analyse &endue -
en phase gazeuse
Reference number
IS0 69759 997(E)
IS0 6975:1997(E)
Page
Contents
..........................................................................................
1 Scope
.................................................................
2 Normative references
..................................................................................
3 Definitions
......................................................................................
4 Principle
......................................... 5
5 Analysis and analytical requirements
.................................................................................
6 Procedures
.....................................................
7 Calibration and control charts
................................................................................
8 Calculations
.....................................................................................
9 Precision
10 Test report .
Annexes
A Determination of the response curves for the main components
................................................................................. 15
in a sample
........................ 21
B Further details on the matrices used in annex A
List of retention indices .
C
D Bibliography .
0 IS0 1997
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 the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internet central@iso.ch
x.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
II
@ IS0 IS0 6975:1997(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 6975 was prepared by Technical Committee
ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of natural gas.
This second edition cancels and replaces the first edition (IS0 6975:1986),
which has been technically revised.
Annexes A to D of this International Standard are for information only.
@ IS0
IS0 6975:1997(E)
Introduction
This International that an accurate
Standa rd d escribes th e specifications
method for the co #mplete and extended a nalysis of natura I gas shall fulfil.
The analytical methods involve injection of natural gas on to packed or
open tubular (capillary) columns in one or more gas chromatographs. The
components coming off the columns are detected by thermal-conductivity
detector (TCD) or flame ionization detector (FID).
Compared to other analytical methods, the extended gas-chromatographic
analysis supplies considerable knowledge of the individual components in
the natural-gas mixture. This allows quantitative measurement of particular
components in the Cs+ fraction and calculation of physical properties.
Although the higher hydrocarbons influence physical properties such as
calorific values and density by less than 0,3 % and 0,004 %, respectively,
knowledge of them is required for evaluation of the pseudo-values for the
Cg+ fraction.
In addition, vapour phase equilibrium calculations often require detailed
composition data, especially of hydrocarbons with carbon numbers higher
than 6.
The simultaneous determination of benzene and other aromatics is needed
for gas consumers using natural gas as a chemical feedstock since these
components can interfere in some processes.
iv
IS0 6975:1997(E)
INTERNATIONAL STANDARD @ IS0
Extended analysis - Gas-chromatographic
Natural gas -
method
1 Scope
This International Standard describes the specifications for the quantitative analysis of the following components of
natural gas:
helium
hydrogen
argon
oxygen
nitrogen
carbon dioxide
saturated hydrocarbons from C1 to C5
hydrocarbon fractions from C6 upwards
aromatic compounds as benzene and toluene
The gas-chromatographic methods determine the components in the following ranges:
oxygen: 0,001 % (n/n) to 0,5 % (n/n)
to 0,5 % (n/n)
helium: 0,001 % (n/n)
hydrogen: 0,001 % (n/n) to 0,5 % (n/n)
argon: 0,001 % (n/n) to 0,5 % (n/n)
nitrogen: 0,001 % (n/n) to 40 % (n/n)
carbon dioxide: 0,001 % (n/n) to 40 % (n/n)
methane: 50 % (n/n) t0 100 % (n/n)
0,OZ % (n/n) t0 15 % (n/n)
ethane:
propane: 0,001 % (n/n) t0 5 % (n/n)
higher hydrocarbons: The method can measure hydrocarbon components from IO-6 (n/n) up to their
maximum concentration, which is compatible with the requirement that the gas is
free from hydrocarbon condensate at any pressure in the range 1 x IO* kPa to
7 x 103 kPa.
@ IS0
IS0 6975:1997(E)
This method is not intended for the determination of oxygen compounds (water vapour, methanol, glycols) or sulfur
compounds”
It is not possible to make unambiguous identifications of hydrocarbons above Ca. Even where “spiking” a gas
mixture with known components shows where they elute, it cannot be stated with certainty that such a
component is the only one with that retention time. Unidentified components are classified according to the carbon
number which the analysis indicates to be appropriate. While this is a necessary simplification, it does allow a
reasonable quantitative value to be obtained.
This method is intended for use in situations where the hexanes plus compositional breakdown and/or the
complete analysis is desired.
The method is not intended for dense phase gases whose pressure exceeds the cricondebar (critical condensation
pressure), or for gas samples containing any measurable hydrocarbon condensate, liquid water or process fluid
such as methanol or glycols (see IS0 6570-I and IS0 10715).
Gases which have been treated for transmission are unlikely to contain detectable levels of hydrocarbons above
C12. Samples taken from nearer the well head, before the gas has reached gas treatment plants, may contain
hydrocarbons to C16 or above.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain
registers of currently valid International Standards.
IS0 5725-l :I 994, Accuracy (trueness and precision) of measurement methods and results - Part I: General
principles and definitions.
IS0 6142:1981, Gas analysis - Preparation of calibration gas mixtures - Weighing methods.
Determination of composition of calibration gas mixtures - Comparison methods.
IS0 6143:1981, Gas analysis -
Determination of sulfur compounds - Part 1: General introduction.
IS0 6326-l : 1989, Natural gas -
Determination of sulfur compounds in natural gas - Part 2: Gas chromatographic
IS0 6326-2:1981, Gas analysis -
method using an electrochemical detector for the determination of odoriferous sulfur compounds.
IS0 6326-3:1989, Natural gas - Determination of sulfur compounds - Part 3: Determination of hydrogen sulfide,
mercaptan sulfur and carbon yi sulfide sulfur by potentiometry.
IS0 6326-4: 1994, Natural gas - Determination of sulfur compounds - Part 4: Gas chromatographic method using
a flame photometric detector for the determination of hydrogen sulfide, carbonyl sulfide and sulfur-containing
odoran ts.
I SO 6326-5: 1989, Natural gas - Determination of sulfur compounds - Part 5: Lingener combustion method.
IS0 6570-I :I 983, Natural gas - Determination of potential hydrocarbon liquid con tent - Part I: Principles and
general requirements.
IS0 6974-l :- 1), Natural gas - Determination of composition with defined uncertainty
chromatography -
bY gas
Part 7: Guidelines for tailored analysis.
1) To be published. (Revision, in parts, of IS0 6974:1984)
0 IS0 IS0 6975:1997(E)
IS0 6974-2: --*I, Natural gas - Determination of composition with defined uncertainty by gas chromatography -
Part 2: Measuring sys tern characteris tics and statistics for data treatment.
IS0 6974-3:
- 21, Natural gas - Determination of composition with defined uncertainty by gas chromatography -
Part 3: Determination of hydrogen, helium, inert gases and hydrocarbons up to Cs.
I SO 6974-4: - Determination of composition with defined uncertainty by gas chromatography -
- 21, Natural gas
Part 4: Determination of nitrogen, carbon dioxide and hydrocarbons (C, up to Cs and C6+) for a laboratory and
on-line measuring system.
- Determination of composition with defined uncertainty by gas chromatography -
IS0 6974-5: - 21, Natural gas
Part 5: Determination of nitrogen, carbon dioxide and hydrocarbons (Cl up to Cs and C,+, for a laboratory and
on-line process application.
I SO 107 15: 1997, Natural gas - Sampling guidelines.
Guidelines for traceability in analysis.
IS0 14111: 1997, Natural gas -
3 Definitions
For the purposes of this International Standard, the following definitions apply.
31 q resolution: Gas-chromatographic resolution is a characteristic of the separation of two adjacent peaks and is
- .
measured as twice the distance between the maxima of the named peaks divided by the sum of the intercepts on
the baseline made by tangents drawn to the peaks at half their height (see figure 1). The resolution RAB may be
expressed by the following equation:
&(B) - d&V
RAB =2x
w(B) +
...
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