BS-EN-ISO-13686-2005.pdf

BRITISH STANDARD BS EN ISO 13686:2005 Incorporating Amendment No. 1 to BS 3156-11.0.2:1998 (renumbers the BS as BS EN ISO 13686:2005) Natural gas Quality designation The European Standard EN ISO 13686:2005 has the status of a British Standard ICS 75.060 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 13686:2005 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 August 1998 © BSI 17 February 2006 ISBN 0 580 30255 5 National foreword This British Standard is the official English language version of EN ISO 13686:2005. It is identical with ISO 13686:1998. The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural gas and gas analysis, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. 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 European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 37 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No.DateComments 16105February 2006Renumbers BS 3156-11.0.2:1998 as BS EN ISO 13686:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 13686:2005 © BSI 17 February 2006i Contents Page National forewordInside front cover ISO forewordiv Text of ISO 136861 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 13686 May 2005 ICS 75.060 English version Natural gas Quality designation (ISO 13686:1998) Gaz naturel Désignation de la qualité (ISO 13686:1998) 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 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 13686:2005: E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of ISO 13686:1998 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 13686:2005 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 13686:1998 has been approved by CEN as EN ISO 13686:2005 without any modifications. EN ISO 13686:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13686:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13686:2005 ii © BSI 17 February 2006 Contents Page Forewordiv Introduction1 1Scope1 2Normative references1 3Definitions2 4Symbols, abbreviations and units5 5Quality designation parameters6 5.1Gas composition6 5.2Gas properties7 6Sampling7 Annex A (informative) Introduction to informative annexes8 A.1Quality specification8 A.2Interchangeability8 A.3Natural gas, Local distribution system11 A.4Condensation curves12 A.5Odorization13 A.6Nominal range of natural gas components13 Annex B (informative) German Regulations Code of Practice DVGW G 260 I:1983, G 260/II:1990 Extract of the relevant parts for natural gases16 B.1Basic gases, substitute gases, additive gases16 B.2Standard state16 B.3Standard values16 B.4Gas families, groups17 B.5Gas composition17 B.6Notes on the technical burning data18 B.7Notes on the gas constituents and gas secondary substances18 B.8Data and guide values for the gas quality19 Annex C (informative) European standard EN 437 “Test gases, test pressures and categories of appliances”21 Annex D (informative) Interchangeability A.G.A. Index Method22 D.1Example for a calculation22 Annex E (informative) British Gas Hydrocarbon Equivalence Method28 E.1Composition-based prediction28 E.2Prediction of Interchangeability29 E.3Three Dimensional Prediction Diagram29 Annex F (informative) Weaver Index Method31 Annex G (informative) French Method for Determining Gas Interchangeability (Delbourg Method)32 G.1Calculation of Interchangeability Indices on the Basis of Chemical Composition of the Gas32 G.2Interchangeability Limits for Second-family Gases for Domestic Appliances at 20 mbar33 Annex H (informative) Bibliography37 Figure A.1 Regional Distribution of Gas Composition Survey Areas15 Figure A.2 Non-Methane Constituents in Natural Gas16 Figure C.1 Gas groups and test gases in the 2nd family (NG) according to EN 43721 Figure E.1 Volume of interchangeability showing inner and outer limits30 Figure E.2 The two dimensional interchangeability diagram30 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13686:2005 © BSI 17 February 2006iii Page Figure G.1 Correction coefficient “K1” for Wobbe index34 Figure G.2 Correction coefficient “K2” for Wobbe index34 Figure G.3 Correction coefficient “U” for combustion potential34 Figure G.4 Mean correction coefficient for hydrocarbons higher than methane35 Figure G.5 Gas interchangeability diagram35 Table A.1 Definitions for testing appliances and gas quality9 Table A.2 Natural gas components13 Table A.3 Regions and states14 Table A.4 Natural gas composition and physical properties15 Table B.1 DVGW G260/I:1983 2nd gas family20 Table B.2 Gas secondary substances; Maximum guide values20 Table C.1 Test pressures for gas groups in the 2nd family according to EN 43721 Table C.2 Test gases for gas groups in the 2nd family according to EN 43722 Table D.1 Test gases used for the example to explain the A.G.A. Method23 Table E.1 Composition and physical properties28 Table E.2 Equivalence factors for hydrocarbons28 Table E.3 Equivalent four-component mixture for gas29 Table F.1 Weaver Index limits31 Table G.1 Gas properties33 Descriptors: Natural gas, specifications, properties, physical properties, chemical composition, designation, quality Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13686:2005 iv © BSI 17 February 2006 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. 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 ISO 13686 was prepared by Technical Committee ISO/TC 193, Natural gas. Annex A to Annex H of this International Standard are for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13686:2005 © BSI 17 February 20061 Introduction The need for an International Standard concerning the designation of natural gas quality was a basic reason for the establishment of ISO/TC 193 in 1989. Standardisation of the designation of quality is specifically stated in the scope of the TC. Natural gas, supplying 20 % of the worlds primary energy, is likely to increase its market share greatly. Yet there is currently no generally accepted definition of natural gas quality. To meet this need, it was decided that a general statement of the parameters (i.e. components and properties) required should be established and that the resulting International Standard would not specify values of, or limits for, these parameters. Furthermore, it was decided that general-purpose natural gas transmitted to local distribution systems (LDS), referred to as “natural gas”, should be the first consideration. Thus, this International Standard was developed. Informative annexes are attached as examples of actual natural gas quality specifications that already exist. This International Standard does not impose any quality restrictions on raw gas transported via pipelines or gathering systems to processing or treating facilities. It should be understood that this International Standard covers natural gas at the pipeline level prior to any treatment by LDS for peakshaving purposes. This covers the vast percentage of the natural gas that is sold in international trade and transmitted for custody transfer to local distribution systems. 1 Scope This International Standard specifies the parameters required to describe finally processed and, where required, blended natural gas. Such gas is referred to subsequently in this text simply as “natural gas”. The main text of this standard contains a list of these parameters, their units and references to measurement standards. Informative annexes give examples of typical values for these parameters, with the main emphasis on health and safety. In defining the parameters governing composition, physical properties and trace constituents, consideration has also been given to existing natural gases to ensure their continuing viability. The question of interchangeability is dealt with in Annex A clause A.2. 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 ISO maintain registers of currently valid International Standards. ISO 6326-1:1989, Natural gas Determination of sulfur compounds Part 1: General introduction. ISO 6326-2:1981, Gas analysis Determination of sulphur compounds in natural gas Part 2: Gas chromatographic method using an electrochemical detector for the determination of odoriferous sulphur compounds. ISO 6326-3:1989, Natural gas Determination of sulfur compounds Part 3: Determination of hydrogen sulfide, mercaptan sulfur and carbonyl sulfide sulfur by potentiometry. ISO 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 other sulfur-containing odorants. ISO 6326-5:1989, Natural gas Determination of sulfur compounds Part 5: Lingener combustion method. ISO 6327:1981, Gas analysis Determination of the water dew point of natural gas Cooled surface condensation hygrometers. ISO 6568:1981, Natural gas Simple analysis by gas chromatography. ISO 6570-1:1983, Natural gas Determination of potential hydrocarbon liquid content Part 1: Principles and general requirements. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:56:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13686:2005 2 © BSI 17 February 2006 ISO 6570-2:1984, Natural gas Determination of potential hydrocarbon liquid content Part 2: Weighing method. ISO 6570-3:1984, Natural gas Determination of potential hydrocarbon liquid content Part 3: Volumetric method. ISO 6974:1984, Natural gas Determination of hydrogen, inert gases and hydrocarbons up to C8 Gas chromatographic method. ISO 6975:1997, Natural gas Extended analysis Gas chromatographic method. ISO 6976:1995, Natural gas Calculation of calorific values, density, relative density and Wobbe index from composition. ISO 10101-1:1993, Natural gas Dete