1、BRITISH STANDARD BS EN ISO 6974-3:2001 Incorporating Amendment No.1 to BS ISO 6974-3:2000 (renumbers the BS ISO as BS EN ISO 6974-3:2001) Natural gas Determination of composition with defined uncertainty by gas chromatography Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxid
2、e and hydrocarbons up to C8 using two packed columns The European Standard EN ISO 6974-3:2001 has the status of a British Standard ICS 75.060 BS EN ISO 6974-3:2001 This British Standard, having been prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was
3、 published under the authority of the Standards Policy and Strategy Committee on 15 August 2000 BSI 16 July 2002 ISBN 0 580 36319 8 National foreword This British Standard is the official English language version of EN ISO 6974-3:2001. It is identical with ISO 6974-3:2000. The UK participation in it
4、s preparation was entrusted to Technical Committee PTI/15, Natural gas and gas analysis, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or Europea
5、n publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessa
6、ry provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any e
7、nquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO forewor
8、d page, the ISO title page, pages ii to v, a blank page, pages 1 to 14, the Annex ZA page and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 13862 16 July 2002 Implementation of t
9、he European Standard.EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO69743 August2001 ICS75.060 Englishversion NaturalgasDeterminationofcompositionwithdefined uncertaintybygaschromatographyPart3:Determinationof hydrogen,helium,oxygen,nitrogen,carbondioxideand hydrocarbonsuptoC8usingtwopackedcolu
10、mns(ISO6974 3:2000) GaznaturelDterminationdelacompositionavecune incertitudedfinieparchromatographieenphasegazeuse Partie3:Dterminationdelhydrogne,delhlium,de loxygne,delazote,dudioxidedecarboneetdes hydrocarburesjusquC8laidededeuxcolonnes remplies(ISO69743:2000) ErdgasBestimmungderZusammensetzungmi
11、t definierterUnsicherhei1durchGaschromatographieTeil 3:BestimmungvonWasserstoff,Helium,Sauerstoff, Stickstoff,Kohlenstoffdioxid undKohlenwasserstoffenbis zuC8mitzweigepacktenSulen(ISO69743:2000) ThisEuropeanStandardwasapprovedbyCENon22June2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalReg
12、ulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversi
13、ons(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,G
14、reece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyformandbyanymea
15、nsreserved worldwideforCENnationalMembers. Ref.No.ENISO69743:2001EINESO9647:32(100E) 2 CORRECTED20020313 Foreword ThetextoftheInternationalStandardfromTechnicalCommitteeISO/TC193“Naturalgas“of theInternationalOrganizationforStandardization(ISO)hasbeentakenoverasaEuropean StandardbyCMC. ThisEuropeanS
16、tandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenticaltextorbyendorsement,atthelatestbyFebruary2002,andconflictingnational standardsshallbewithdrawnatthelatestbyFebruary2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowingcount
17、riesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg, Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom. Erodnseemcitontne TxetehtfonIehtretnatoianSltnaradIdSO64793:02h00asebnerppaovedb
18、yCEsaNa ruEopnaetSdnaradhtiwtuonaymfidoicasnoit. ONTEroNmrevitaefercneseIotnretnitaanolatSradnsdraleistdeninaxenZA(ronma)evit. ENISO69743:2001ENISO69743:2001(E) 2 OCTCERRDE00223013 weroFdro TxetehtfonIehtretnatoianSltnaradfdrmoTeccinhamoClmIeettiSO/TC391taN“rulasag“fo IehtnretnatoianOlrnagiztanoifor
19、natSraddiitaz(noIOS)sahbneekatonevresaaruEepona natSradbdyCMC. ThsiruEeponaatSradndslahbleginevsehttsutafonaaitanosltaradnd,eirehtbyuplbciitanofo inanedcitaxetltrobynerodsemtta,tneehsetaltbyFrbeuary002a,2cdnofnciltningaitanol stradnasdshlaeblwitrdhnwataehtalsettbyFerbrauy02.20 cAcordnigNECehtot/ENEC
20、LEretnICngeRlaulaitsno,htenaitanolstaradnsdronagiztasnoifo fehtollowcgniortnuiserabeoutdnomimelphttnesiruEoaepnnatSrad:dsuAtri,aeBglmui,cezCh upeRlbcimneD,rak,Fi,dnalnFrcnaG,eermnay,GreececI,elnarI,delnatI,dlay,xuLmeruob,g rehteNnalds,roNway,roPtagu,lapSin,Swede,nSwitrezlaadntdnUehntideiKgnmod. Endo
21、rsementnotice ThetextoftheInternationalStandardISO69743:2000hasbeenapprovedbyCENasa EuropeanStandardwithoutanymodifications. NOTENormativereferencestoInternationalStandardsarelistedinannexZA(normative). 1002:34796OSINEReference number ISO 6974-3:2000(E) INTERNATIONAL STANDARD ISO 6974-3 First editio
22、n 2000-04-01 Natural gas Determination of composition with defined uncertainty by gas chromatography Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8 using two packed columns Gaz naturel Dtermination de la composition avec une incertitude dfinie p
23、ar chromatographie en phase gazeuse Partie 3: Dtermination de lhydrogne, de lhlium, de loxygne, de lazote, du dioxyde de carbone et des hydrocarbures jusqu C8 laide de deux colonnes remplies ENISO69743:2001ENISO69743:2001iiISO -47963:(0002)E ISO 0002 All irhgts seredevr iii Contents Page Foreword.iv
24、 Introduction.v 1 Scope 1 2 Normative references 1 3 Principle2 4 Materials .2 5 Apparatus .3 6 Procedure .5 7 Expression of results 8 8 Test report 9 Annex A (informative) Single-oven gas-chromatographic system consisting of two columns .10 Annex B (informative) Typical precision values 13 ENISO697
25、43:2001iiiISO -47963:(0002)E vi ISO 0002 All irhgts seredevr 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 commi
26、ttees. 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 I
27、nternational 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 3. Draft International Standards adopted by the technical committees are circulated to the member
28、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 part of ISO 6974 may be the subject of patent rights. ISO shall not be held responsible for iden
29、tifying any or all such patent rights. International Standard ISO 6974-3 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of natural gas. This part as well as the other five parts of ISO 6974 cancel and replace ISO 6974:1984 which specified only one method. IS
30、O 6974 consists of the following parts, under the general title Natural gas Determination of composition with defined uncertainty by gas chromatography : Part 1: Guidelines for tailored analysis Part 2: Measuring-system characteristics and statistics for data treatment Part 3: Determination of hydro
31、gen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C 8 using two packed columns Part 4: Determination of nitrogen, carbon dioxide and C 1 to C 5 and C 6+ hydrocarbons for a laboratory and on- line measuring system using two columns Part 5: Determination of nitrogen, carbon dioxide
32、and C 1 to C 5 and C 6+ hydrocarbons for a laboratory and on- line process application using three columns Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C 8 using three capillary columns Annexes A and B of this part of ISO 6974 are for information
33、 only. ENISO69743:2001ivISO -47963:(0002)E ISO 0002 All irhgts seredevr v Introduction This part of ISO 6974 describes a precise and accurate method for the analysis of natural gas, which permits the determination of the composition of natural gas. The compositional data obtained are used for the ca
34、lculation of calorific value, relative density and the Wobbe index. This method requires the use of two columns which are put into one or two gas chromatographs. The constituents of the eluent of the first column are detected by a thermal conductivity detector (TCD). The constituents of the eluent o
35、f the second column are detected by a TCD and flame ionization (FID) in series. If the two columns are put into one chromatograph the gas chromatographic conditions are described in informative annex A. This part of ISO 6974 provides one of the methods that may be used for determining the compositio
36、n of natural gas in accordance with parts 1 and 2 of ISO 6974. ENISO69743:2001vINTENRATIONAL TSANDADR ISO -47963:(0002)E ISO 0002 All irhgts seredevr 1 Natural gas Determination of composition with defined uncertainty by gas chromatography Part 3: Determination of hydrogen, helium, oxygen, nitrogen,
37、 carbon dioxide and hydrocarbons up to C8 using two packed columns 1 Scope This part of ISO 6974 describes a gas chromatographic method for the quantitative determination of the content of helium, hydrogen, oxygen, nitrogen, carbon dioxide and C 1 to C 8 hydrocarbons in natural gas samples using two
38、 packed columns. This method is applicable to determinations made in on-line processes or in the laboratory. It is applicable to the analysis of gases containing constituents within the mole fraction ranges given in Table 1 and which do not contain any hydrocarbon condensate. These ranges do not rep
39、resent the limits of detection, but the limits within which the stated precision of the method applies. Although one or more components in a sample may not be detected present, the method can still be applicable. This part of ISO 6974 is only applicable in conjunction with parts 1 and 2 of ISO 6974.
40、 Table 1 Application ranges Component Mole fraction range % Helium 0,01 to 0,5 Hydrogen 0,01 to 0,5 Oxygen 0,1 to 0,5 Nitrogen 0,1 to 40 Carbon dioxide 0,1 to 30 Methane 50 to 100 Ethane 0,1 to 15 Propane 0,001 to 5 Butanes 0,000 1 to 2 Pentanes 0,000 1 to 1 Hexanes to octanes 0,000 1 to 0,5 2 Norma
41、tive references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 6974. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on
42、 this part of ISO 6974 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid
43、 International Standards. ENISO69743:20011ISO -47963:(0002)E 2 ISO 0002 All irhgts seredevr ISO 6974-1:2000, Natural gas Determination of composition with defined uncertainty by gas chromatography Part 1: Guidelines for tailored analysis. ISO 6974-2: 1) , Natural gas Determination of composition wit
44、h defined uncertainty by gas chromatography Part 2: Measuring-system characteristics and statistics for data treatment. ISO 7504, Gas analysis Vocabulary. 3P r i n c i p l e Determination of nitrogen, carbon dioxide and hydrocarbons from C 1 to C 8 by gas chromatography using two chromatographic col
45、umns. A molecular sieve 13X column coupled with a thermal conductivity detector (TCD) is used for the separation and detection of hydrogen, helium, oxygen and nitrogen, and a Porapak R column coupled with a TCD and a flame ionization detector (FID) in series is used for the separation and detection
46、of nitrogen, carbon dioxide and hydrocarbons from C 1 to C 8 . The two analyses are carried out independently and the results are combined. If oxygen is seen to be present at a mole fraction greater than 0,02 % when measured using the molecular sieve column, then the nitrogen value shall be taken fr
47、om the molecular sieve analysis. If the mole fraction of oxygen is less than 0,02 % and assuming that hydrogen is absent from the gas sample, the nitrogen value can be taken from the Porapak R analysis. Quantitative results are achieved by determining the response of the TCD detector with reference-gas mixtures and using relative response factors of the FID detector. The resulting composition of the natural gas is n
