Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 4: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns (ISO 6974-4:2000)

Migrated from Progress Sheet (TC Comment) (2000-07-10): WIs 020-025 = result of the splitting of WI 011 (CC/991102 at the request of ++ R. R{migy and A. Pirlet)

Erdgas - Bestimmung der Zusammensetzung mit definierter Unsicherheit durch Gaschromatographie - Teil 4: Bestimmung von Stickstoff, Kohlenstoffdioxid und C1 bis C5 und C6+ Kohlenwasserstoffen für ein Labor- und On-line-Messsystem mit zwei Säulen (ISO 6974-4:2000)

Dieser Teil von ISO 6974 beschreibt ein gaschromatographisches Verfahren zur quantitativen Bestimmung der Bestandteile von Erdgas mit zwei gepackten Säulen. Dieses Verfahren kann zur Bestimmung in On-line-Prozessen und im Laboratorium eingesetzt werden. Es ist anwendbar zur Analyse von Gasen, deren Bestandteile im Bereich der in Tabelle 1 angegebenen Molfraktionen liegen. Diese Bereiche stellen nicht die Detektionsgrenzen dar, sondern die Grenzen, innerhalb deren die angegebene Präzision gilt. Auch wenn eine oder mehrere Komponenten in einer Probe nicht nachgewiesen werden, kann das Verfahren trotzdem angewandt werden.
Dieser Teil von ISO 6974 kann nur in Verbindung mit den Teilen 1 und 2 von ISO 6974 angewandt werden.
Tabelle 1 - Anwendungsbereiche
Komponente   Molfraktionsbereich
%
Stickstoff   0,001 bis 15,0
Kohlenstoffdioxid   0,001 bis 10
Methan   75 bis 100
Ethan   0,001 bis 10,0
Propan   0,001 bis 3,0
iso-Butan (2-Methylpropan)   0,001 bis 1,0
n-Butan   0,001 bis 1,0
neo-Pentan (2,2-Dimethylpropan)   0,001 bis 0,5
iso-Pentan (2-Methylbutan)   0,001 bis 0,5
n-Pentan   0,001 bis 0,5
Hexane + Summe aller C6 - und höheren Kohlenwasserstoffe   0,001 bis 0,2
ANMERKUNG 1   Erdgas enthält üblicherweise keinen Sauerstoff und es ist auch nicht zu erwarten, dass er in einer Gasprobe für ein On-line-Gerät enthalten ist. Wenn überhaupt Sauerstoff enthalten ist, wird er zusammen mit dem Stickstoff bestimmt. Der erhaltene Wert (Stickstoff + Sauerstoff) wird aufgrund eines geringen Unterschiedes zwischen den Detektorresponsen für Sauerstoff und Stickstoff etwas falsch sein. Nichtsdestoweniger wird das Ergebnis des Gas/Luft-Gemisches ziemlich genau sein, da keine der beiden Komponenten etwas zum Brennwert beiträgt.
ANMERKUNG 2   Es wird davon ausgegangen, dass der Gehalt an Helium und Argon zu vernachlässigen und unveränderlich ist, so dass Helium und Argon nicht bestimmt zu werden brauchen.

Gaz naturel - Détermination de la composition avec une incertitude définie par chromatographie en phase gazeuse - Partie 4: Détermination de l'azote, du dioxyde de carbone et des hydrocarbures (C1 à C5 et C6+) pour un laboratoire et un système de mesure en continu employant deux colonnes (ISO 6974-4:2000)

L'ISO 6974-4:2000 décrit une méthode par chromatographie en phase gazeuse pour la détermination quantitative de constituants du gaz naturel, à l'aide d'un système à deux colonnes. Cette méthode est applicable aux déterminations réalisées dans des processus en continu ou en laboratoire. Elle est applicable à l'analyse de gaz contenant des constituants dans les limites des gammes de fractions molaires indiquées au Tableau 1 de l'ISO 6974-4:2000. Ces gammes ne représentent pas les limites de détection, mais les limites à l'intérieur desquelles s'applique la fidélité spécifiée de la méthode. Même si la présence d'un ou de plusieurs constituants d'un échantillon est susceptible de ne pas être détectée, la méthode peut tout de même être applicable.
L'ISO 6974-4:2000 n'est applicable que conjointement avec l'ISO 6974-1 et l'ISO 6974-2.

Zemeljski plin - Določevanje sestave z določeno negotovostjo s plinsko kromatografijo - 4. del: Določevanje dušika, ogljikovega dioksida in C1 do C5 in C6+ ogljikovodikov za laboratorijske in neposredne merilne sisteme z uporabo dveh kolon (ISO 6974-4:2000)

General Information

Status
Published
Publication Date
21-Aug-2001
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
9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
Start Date
12-Nov-2009
Completion Date
12-Nov-2009
Ref Project
SIST EN ISO 6974-4:2001 - Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 4: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns (ISO 6974-4:2000)

Relations

Revised
prEN ISO 6974-4 - Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 4: Guidance on gas analysis (ISO/DIS 6974-4:2025)
Effective Date
28-Jan-2023

Overview

EN ISO 6974-4:2001 specifies a gas‑chromatographic method for the quantitative determination of natural gas composition - with defined uncertainty - using a two‑column system. The method covers nitrogen, carbon dioxide, C1–C5 hydrocarbons and a C6+ composite for both laboratory and on‑line measuring systems. Results are suitable for calculating calorific value, relative density and the Wobbe index.

Key topics and technical requirements

  • Scope & application ranges: Mole fraction ranges are defined (examples):
    • Nitrogen: 0.001–15%
    • Carbon dioxide: 0.001–10%
    • Methane: 75–100%
    • Ethane: 0.001–10%
    • Propane: 0.001–3%
    • Butanes/pentanes and C6+: specified down to 0.001%, C6+ up to 0.2%
  • Analytical principle: Two packed metal columns in series (short + long) with a backflush arrangement; all analytes detected by a thermal conductivity detector (TCD).
  • Columns & packing: Packed with 28% DC‑200 on Chromosorb PAW; example dimensions given (column 1: 0.45 m, column 2: 9 m, ID 4.75 mm).
  • Carrier gas & reference materials:
    • Helium carrier gas, purity > 99.99%
    • Working reference gas mixtures (WRM) prepared gravimetrically per ISO 6142 and validated per ISO 6143
  • Operating controls:
    • Oven temperature stability ±0.1 °C over 70–150 °C
    • TCD time constant ≤ 0.1 s
    • Multi‑port injection/valve system for injections and backflush sequencing
  • Uncertainty, precision & reporting: Designed to be used with ISO 6974‑1 (tailored analysis) and ISO 6974‑2 (measuring‑system characteristics & data treatment) to establish measurement uncertainty and precision.

Practical applications and users

  • Typical users:
    • Natural gas laboratories and QA/QC teams
    • Pipeline and distribution operators for custody transfer and gas quality monitoring
    • Metering station and energy traders requiring accurate calorific value/Wobbe index
    • Instrument manufacturers and integrators of on‑line GC systems
  • Practical uses:
    • Routine composition analysis for billing, trading and regulatory compliance
    • On‑line process control and leak/contamination detection (e.g., CO2, N2 levels)
    • Method validation and calibration using WRMs for traceable results

Related standards

  • ISO 6974 series (Parts 1, 2, 3, 5, 6) - guidance, statistics and alternate column configurations
  • ISO 6142, ISO 6143 - preparation and validation of calibration gas mixtures
  • ISO 7504 - gas analysis vocabulary

Keywords: EN ISO 6974-4:2001, natural gas composition, gas chromatography, two columns, nitrogen, carbon dioxide, C1–C5, C6+, thermal conductivity detector, WRM, measurement uncertainty.

Frequently Asked Questions

EN ISO 6974-4:2001 is a standard published by the European Committee for Standardization (CEN). Its full title is "Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 4: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns (ISO 6974-4:2000)". This standard covers: Migrated from Progress Sheet (TC Comment) (2000-07-10): WIs 020-025 = result of the splitting of WI 011 (CC/991102 at the request of ++ R. R{migy and A. Pirlet)

Migrated from Progress Sheet (TC Comment) (2000-07-10): WIs 020-025 = result of the splitting of WI 011 (CC/991102 at the request of ++ R. R{migy and A. Pirlet)

EN ISO 6974-4:2001 is classified under the following ICS (International Classification for Standards) categories: 75.060 - Natural gas. The ICS classification helps identify the subject area and facilitates finding related standards.

EN ISO 6974-4:2001 has the following relationships with other standards: It is inter standard links to prEN ISO 6974-4. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

You can purchase EN ISO 6974-4:2001 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.LQVNRErdgas - Bestimmung der Zusammensetzung mit definierter Unsicherheit durch Gaschromatographie - Teil 4: Bestimmung von Stickstoff, Kohlenstoffdioxid und C1 bis C5 und C6+ Kohlenwasserstoffen für ein Labor- und On-line-Messsystem mit zwei Säulen (ISO 6974-4:2000)Gaz naturel - Détermination de la composition avec une incertitude définie par chromatographie en phase gazeuse - Partie 4: Détermination de l'azote, du dioxyde de carbone et des hydrocarbures (C1 a C5 et C6+) pour un laboratoire et un systeme de mesure en continu employant deux colonnes (ISO 6974-4:2000)Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 4: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns (ISO 6974-4:2000)75.060Zemeljski plinNatural gasICS:Ta slovenski standard je istoveten z:EN ISO 6974-4:2001SIST EN ISO 6974-4:2001en01-december-2001SIST EN ISO 6974-4:2001SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 6974-4August 2001ICS 75.060English versionNatural gas - Determination of composition with defineduncertainty by gas chromatography - Part 4: Determination ofnitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbonsfor a laboratory and on-line measuring system using twocolumns (ISO 6974-4:2000)Gaz naturel - Détermination de la composition avec uneincertitude définie par chromatographie en phase gazeuse- Partie 4: Détermination de l'azote, du dioxyde de carboneet des hydrocarbures (C1 à C5 et C6+) pour un laboratoireet un système de mesure en continu employant deuxcolonnes (ISO 6974-4:2000)Erdgas - Bestimmung der Zusammensetzung mitdefinierter Unsicherheit durch Gaschromatographie - Teil 4:Bestimmung von Stickstoff, Kohlenstoffdioxid und C1 bisC5 und C6+ Kohlenwasserstoffen für ein Labor- und On-line-Messsystem mit zwei Säulen (ISO 6974-4:2000)This European Standard was approved by CEN on 22 June 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 6974-4:2001 ESIST EN ISO 6974-4:2001

2002-03-13ForewordThe text of the International Standard from Technical Committee ISO/TC 193 "Natural gas" ofthe International Organization for Standardization (ISO) has been taken over as a EuropeanStandard by CMC.This European Standard shall be given the status of a national standard, either by publication ofan identical text or by endorsement, at the latest by February 2002, and conflicting nationalstandards shall be withdrawn at the latest by February 2002.According to the CEN/CENELEC Internal Regulations, the national standards organizations ofthe following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Endorsement noticeThe text of the International Standard ISO 6974-4:2000 has been approved by CEN as aEuropean Standard without any modifications.NOTE
Normative references to International Standards are listed in annex ZA (normative).SIST EN ISO 6974-4:2001

ReferencenumberISO6974-4:2000(E)©ISO2000INTERNATIONALSTANDARDISO6974-4Firstedition2000-04-01Naturalgas—Determinationofcompositionwithdefineduncertaintybygaschromatography—Part4:Determinationofnitrogen,carbondioxideandC1toC5andC6+hydrocarbonsforalaboratoryandon-linemeasuringsystemusingtwocolumnsGaznaturel—Déterminationdelacompositionavecuneincertitudedéfinieparchromatographieenphasegazeuse—Partie4:Déterminationdel'azote,dudioxydedecarboneetdeshydrocarbures(C1àC5etC6+)pourunlaboratoireetunsystèmedemesureencontinuemployantdeuxcolonnesSIST EN ISO 6974-4:2001

ISO6974-4:2000(E)PDFdisclaimerThisPDFfilemaycontainembeddedtypefaces.InaccordancewithAdobe'slicensingpolicy,thisfilemaybeprintedorviewedbutshallnotbeeditedunlessthetypefaceswhichareembeddedarelicensedtoandinstalledonthecomputerperformingtheediting.Indownloadingthisfile,partiesacceptthereintheresponsibilityofnotinfringingAdobe'slicensingpolicy.TheISOCentralSecretariatacceptsnoliabilityinthisarea.AdobeisatrademarkofAdobeSystemsIncorporated.DetailsofthesoftwareproductsusedtocreatethisPDFfilecanbefoundintheGeneralInforelativetothefile;thePDF-creationparameterswereoptimizedforprinting.EverycarehasbeentakentoensurethatthefileissuitableforusebyISOmemberbodies.Intheunlikelyeventthataproblemrelatingtoitisfound,pleaseinformtheCentralSecretariatattheaddressgivenbelow.©ISO2000Allrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherISOattheaddressbeloworISO'smemberbodyinthecountryoftherequester.ISOcopyrightofficeCasepostale56CH-1211Geneva20Tel.+41227490111Fax+41227341079E-mailcopyright@iso.chWebwww.iso.chPrintedinSwitzerlandii©ISO2000–AllrightsreservedSIST EN ISO 6974-4:2001

ISO6974-4:2000(E)©ISO2000–AllrightsreservediiiContentsPageForeword.ivIntroduction.v1Scope.12Normativereferences.23Principle.24Materials.25Apparatus.26Procedure.46.1Gaschromatographicoperatingconditions.46.2Performancerequirements—Peakresolution.76.3Determination—Outlineoftheanalysis.87Expressionofresults.87.1Calculation.87.2Precisionandaccuracy.88Testreport.8AnnexA(informative)Procedureforsettingvalvetimingsandrestrictionsetting.9AnnexB(informative)Finaltime.10AnnexC(informative)Typicalprecisionvalues.11Bibliography.12SIST EN ISO 6974-4:2001

ISO6974-4:2000(E)iv©ISO2000–AllrightsreservedForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3.DraftInternationalStandardsadoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforvoting.PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote.AttentionisdrawntothepossibilitythatsomeoftheelementsofthispartofISO6974maybethesubjectofpatentrights.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.InternationalStandardISO6974-4waspreparedbyTechnicalCommitteeISO/TC193,Naturalgas,SubcommitteeSC1,Analysisofnaturalgas.ThispartaswellastheotherfivepartsofISO6974cancelandreplaceISO6974:1984whichspecifiedonlyonemethod.ISO6974consistsofthefollowingparts,underthegeneraltitleNaturalgas—Determinationofcompositionwithdefineduncertaintybygaschromatography:—Part1:Guidelinesfortailoredanalysis—Part2:Measuring-systemcharacteristicsandstatisticsfordatatreatment—Part3:Determinationofhydrogen,helium,oxygen,nitrogen,carbondioxideandhydrocarbonsuptoC8usingtwopackedcolumns—Part4:Determinationofnitrogen,carbondioxideandC1toC5andC6+hydrocarbonsforalaboratoryandon-linemeasuringsystemusingtwocolumns—Part5:Determinationofnitrogen,carbondioxideandC1toC5andC6+hydrocarbonsforalaboratoryandon-lineprocessapplicationusingthreecolumns—Part6:Determinationofhydrogen,helium,oxygen,nitrogen,carbondioxideandhydrocarbonsuptoC8usingthreecapillarycolumnsAnnexesAtoCofthispartofISO6974areforinformationonly.SIST EN ISO 6974-4:2001

ISO6974-4:2000(E)©ISO2000–AllrightsreservedvIntroductionThispartofISO6974specifiesapreciseandaccuratemethodforthedeterminationofthecompositionofnaturalgas.Thecompositionaldataobtainedareusedforthecalculationofthecalorificvalue,therelativedensityandtheWobbeindex.Thismethodrequirestheuseoftwocolumnsplacedinseriesinasingle-ovengaschromatograph.Thecombinationoftwocolumnsmakesbackflushingpossible.Alltheconstituentsincludingthebackflushpeakaredetectedbyathermalconductivitydetector(TCD).ThismethodisderivedfromISO6568,Naturalgas—Simpleanalysisbygaschromatography.ThispartofISO6974providesoneofthemethodsthatmaybeusedfordeterminingthecompositionofnaturalgasinaccordancewithparts1and2ofISO6974.SIST EN ISO 6974-4:2001

INTERNATIONALSTANDARDISO6974-4:2000(E)©ISO2000–Allrightsreserved1Naturalgas—Determinationofcompositionwithdefineduncertaintybygaschromatography—Part4:Determinationofnitrogen,carbondioxideandC1toC5andC6+hydrocarbonsforalaboratoryandon-linemeasuringsystemusingtwocolumns1ScopeThispartofISO6974describesagaschroma
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