1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 6974-1:2012Natural gas Determination of compositionand associated uncertainty by gas chromatographyPart 1: General guidelines andcalculation of compositionBS EN ISO 697
2、4-1:2012Incorporating corrigendum November 2012BS EN ISO 6974-1:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 6974-1:2012. It is identical to ISO 6974-1:2012, incorporating corrigendum November 2012. Together with BS EN ISO 6974-2:2012, it supersedes
3、BS EN ISO 6974-1:2001 and BS EN ISO 6974-2:2002, which are withdrawn.The start and finish of text introduced or altered by corrigendumis indicated in the text by tags. Text altered by ISO corrigendumNovember 2012 is indicated in the text by .The UK participation in its preparation was entrusted to T
4、echnical Committee PTI/15, Natural Gas and Gas Analysis.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application. The Bri
5、tish Standards Institution 2013.Published by BSI Standards Limited 2013ISBN 978 0 580 81439 6ICS 75.060Compliance with a British Standard cannot confer immunityfrom legal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2
6、012.Amendments/corrigenda issued since publicationDate Text affected30 April 2013 Implementation of ISO corrigendumNovember 2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6974-1 May 2012 ICS 75.060 Supersedes EN ISO 6974-1:2001English Version Natural gas - Determination of composition
7、and associated uncertainty by gas chromatography - Part 1: General guidelines and calculation of composition (ISO 6974-1:2012) Gaz naturel - Dtermination de la composition et de lincertitude associe par chromatographie en phase gazeuse - Partie 1: Lignes directrices gnrales et calcul de la compositi
8、on (ISO 6974-1:2012) Erdgas - Bestimmung der Zusammensetzung und der zugehrigen Unsicherheit durch Gaschromatographie - Teil 1: Allgemeine Leitlinien und Berechnung der Zusammensetzung (ISO 6974-1:2012) This European Standard was approved by CEN on 14 May 2012. CEN members are bound to comply with t
9、he 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 Manageme
10、nt 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
11、 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,
12、Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any mea
13、ns reserved worldwide for CEN national Members. Ref. No. EN ISO 6974-1:2012: EBS EN ISO 6974-1:2012 EN ISO 6974-1:2012 (E) 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 s
14、tandard, 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 r
15、ights. 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
16、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 an
17、d 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. BS EN ISO 6974-1:2012 EN ISO 6974-1:2012 (E) 3 Foreword This document (EN ISO 6974-1:2012) has been prepared by Technical Committee ISO/TC 193 “Natural gas“
18、. 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 so
19、me 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 organization
20、s 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,
21、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. BS EN ISO 6974-1:2012 EN ISO 6974-1:2012 (E) 3 Foreword This document (EN ISO 6974-1:2012)
22、 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 late
23、st 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
24、/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, Lit
25、huania, 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. BS EN ISO 6974-1:2012ISO
26、 6974-1:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Terms and definitions . 14 Symbols . 54.1 Symbols . 54.2 Subscripts . 65 Principles of analysis . 65.1 General considerations . 65.2 Method of operation 75.3 Mode of operation .
27、 85.4 Directly and indirectly measured components . 85.5 Normalization . 86 Analytical procedure 86.1 General considerations . 86.2 Step 1 Defining the working range 106.3 Step 2 Defining the requirements of the analytical method . 116.4 Step 3 Selecting equipment and working conditions . 116.5 Step
28、 4 Response characteristics (primary calibration or performance evaluation) 126.6 Step 5 Relative response factors .156.7 Step 6 Routine calibration/quality assurance check 166.8 Step 7 Analysis of samples .176.9 Step 8 Calculation of component mole fractions 187 Control chart .218 Test report .21An
29、nex A (informative) Comparative application ranges and characteristics of analytical methods described in ISO 6974-3 to ISO 6974-6 23Annex B (informative) Alternative approach to bridging and normalization 25Annex C (informative) Methane-by-difference approach .32Annex D (normative) Relative respons
30、e factors 33Annex E (informative) Testing for outliers .35Annex F (normative) Pressure correction during calibration and sample analysis .36Annex G (informative) Software suitable for generalized least squares regression analysis .38Annex H (informative) Use of control charts .40Bibliography .41BS E
31、N ISO 6974-1:2012ISO 6974-1:2012(E)ForewordISO (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 int
32、erested 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 Electrotechnic
33、al 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 te
34、chnical 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
35、 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 I
36、SO 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
37、Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8using two packed columns Part 4: Determination of nitrogen, carbon dioxide and C1to C5and C6+hydrocarbons for a laboratory and on-line measuring system using two columns Part 5: Determination of nitr
38、ogen, carbon dioxide and C1to C5and C6+hydrocarbons for a laboratory and on-line process application using three columns Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1to C8hydrocarbons using three capillary columnsFuture subsequent parts of ISO 6974 are planned.iv
39、 ISO 2012 All rights reservedBS EN ISO 6974-1:2012ISO 6974-1:2012(E)ForewordISO (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
40、 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
41、 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 Internat
42、ional 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
43、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 a
44、nd 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
45、Part 2: Uncertainty calculations Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8using two packed columns Part 4: Determination of nitrogen, carbon dioxide and C1to C5and C6+hydrocarbons for a laboratory and on-line measuring system using two colu
46、mns Part 5: Determination of nitrogen, carbon dioxide and C1to C5and C6+hydrocarbons for a laboratory and on-line process application using three columns Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1to C8hydrocarbons using three capillary columnsFuture subsequent
47、 parts of ISO 6974 are planned.iv ISO 2012 All rights reservedBS EN ISO 6974-1:2012ISO 6974-1:2012(E)IntroductionISO 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 H2, He, O2, N2, C
48、O2and hydrocarbons, either as individual components or as a group, for example all hydrocarbons above C5, defined as C6+. This approach is suitable for a range of end applications, including calibrating gas mixtures and providing natural gas composition and uncertainty data to be used in the calcula
49、tion of calorific value and other additive physical properties of the gas. Details of these end applications are provided in ISO 6974-3 and subsequent parts of ISO 6974.This part of ISO 6974 gives guidelines for the gas chromatographic analysis of natural gas and methods of data processing to determine compositions of component mole fractions.ISO 6974-2 describes the steps required to calculate the uncertainty of each component mole fraction.ISO 6974-3 and subsequent parts of ISO 6974 describe different gas chromatographic met
