1、April 2016 English price group 20No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 75.060This standard has been inclu
2、ded in the body of DVGW Technical Rules.!%Q#“2469700www.din.deDIN EN 16726Gas infrastructure Quality of gas Group H;English version EN 16726:2015,English translation of DIN EN 16726:2016-04Gasinfrastruktur Beschaffenheit von Gas Gruppe H;Englische Fassung EN 16726:2015,Englische bersetzung von DIN E
3、N 16726:2016-04Infrastructure gazire Qualit du gaz Groupe H;Version anglaise EN 16726:2015,Traduction anglaise de DIN EN 16726:2016-04www.beuth.deDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.Document comprises 49 pages 04.16 2 A
4、comma is used as the decimal marker. National foreword This document (EN 16726:2015) has been prepared by Technical Committee CEN/TC 234 “Gas infrastructure” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Gastechnik (DIN Standards Committ
5、ee Gas Technology). This European Standard covers requirements and test methods for Group H gases. In Germany, the technical rule DVGW G 260 governs the quality of publicly supplied gas, including Group H gases. DVGW G 260 will be revised upon publication of this European Standard so that there will
6、 not be any conflicts between the two documents. However, DVGW G 260 will not be withdrawn because it covers other gases than Group H gases, as well as calorimetric parameters for Group H gases which have not been dealt with in the present first edition of this European Standard due to a lack of agr
7、eement within Europe on this subject. In particular, there are no concrete details laid down in this standard regarding the Wobbe index range, which means that DVGW G 260 continues to apply in Germany as regards the calorimetric properties of Group H gases until the next edition of this European sta
8、ndard is published. For more information on this subject, see the informative Annex D in this European Standard. It is intended to include this standard in the body of technical rules and standards for gas issued by the DVGW Deutscher Verein des Gas- und Wasserfaches e.V. (German Technical and Scien
9、tific Association for Gas and Water). This is the first edition of this standard. National Annex NA (informative) Bibliography DIN EN ISO 14912, Gas analysis Conversion of gas mixture composition data (ISO 14912:2003) DIN EN 16726:2016-04 seEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16726
10、December 2015 ICS 75.060 English Version Gas infrastructure - Quality of gas - Group H Infrastructure gazire - Qualit du gaz - Groupe H Gasinfrastruktur - Beschaffenheit von Gas - Gruppe HThis European Standard was approved by CEN on 24 October 2015. CEN members are bound to comply with the CEN/CENE
11、LEC 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 Management Centre o
12、r 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 as the off
13、icial versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands
14、, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of
15、 exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16726:2015 EEN 16726:2015 (E) 2 Contents Page European foreword . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Reference conditions and pressure units . 6 5 Requir
16、ements . 6 Annex A (normative) Calculation of methane number of gaseous fuels for engines . 9 A.1 Introduction 9 A.2 Calculation of methane number 9 A.3 Example 1: 2H-gas 10 A.4 Example 2: enriched biomethane . 16 A.5 Example 3: 2H-gas with hydrogen addition 17 Annex B (informative) Sulfur 31 B.1 Ge
17、neral . 31 B.2 Total sulfur from Odorants . 31 Annex C (informative) Water dew point and hydrocarbon dew point 35 C.1 Water dew point . 35 C.2 Hydrocarbon dew point . 35 Annex D (informative) Background for not including a Wobbe Index range into this standard 36 D.1 General . 36 D.2 A common Europea
18、n Wobbe index range . 38 Annex E (informative) Hydrogen - Admissible Concentrations in natural gas systems 39 Annex F (informative) Sampling 40 Annex G (informative) Adeviations 41 Bibliography . 46 DIN EN 16726:2016-04 EN 16726:2015 (E) 3 European foreword This document (EN 16726:2015) has been pre
19、pared by Technical Committee CEN/TC 234 “Gas infrastructure”, the secretariat of which is held by DIN. 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 June 2016, and conflicting national standards
20、 shall be withdrawn at the latest by June 2016. 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 has been prepared under
21、a mandate given to CEN by the European Commission and the European Free Trade Association. The need for a European Standard concerning the specification of the quality of gases of group H is derived from the mandate M/400 issued to CEN by the European Commission. According to this mandate the goal i
22、s to define specifications that are as wide as possible within reasonable costs. This means that the specifications enhance the free flow of gas within the internal EU market, in order to promote competition and security of supply minimizing the negative effects on gas infrastructure and gas network
23、s, efficiency and the environment and allow appliances to be used without compromising safety. Some requirements specified in this European Standard, Clause 5, cannot be applied in Germany, Hungary and the Netherlands due to existing conflicting national legislation. The related A-Deviations are lis
24、ted in Annex G. According to the CEN-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, Former Yugoslav Republic of Macedo
25、nia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 16726:2016-04 EN 16726:2015 (E) 4 Introduction This European sta
26、ndard sets requirements for gas quality with the aim to allow the free flow of gas between the CEN member states and to enable the security of supply taking into account the impact on the whole value chain from gas production and supply to end uses. However, at the moment of publication of this Euro
27、pean standard, a common Wobbe Index range cannot be defined because of different regulations in CEN Member States and limited knowledge of the influence of broadening Wobbe Index range on integrity, efficiency and safe use of appliances in some countries (see Annex D). In order to find a common Wobb
28、e Index range, further studies, such as the Gas Quality Harmonization Implementation Pilot, are necessary. The Wobbe Index should be defined when the pending results of these studies are available. The common Wobbe Index range should be implemented in a revised standard in due time. For hydrogen, at
29、 present it is not possible to specify a limiting value which would generally be valid for all parts of the European gas infrastructure (see Annex E). Responsibility and liability issues in the context of this European standard are subject to European or national regulations. DIN EN 16726:2016-04 EN
30、 16726:2015 (E) 5 1 Scope This European standard specifies gas quality characteristics, parameters and their limits, for gases classified as group H that are to be transmitted, injected into and from storages, distributed and utilized. NOTE For information on gas families and gas groups see EN 437.
31、This European standard does not cover gases conveyed on isolated networks. For biomethane, additional requirements indicated in prEN 16723-1 apply. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its applicati
32、on. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 13443, Natural gas - Standard reference conditions (ISO 13443) EN ISO 14532, Natural gas - Vocabulary (ISO 14532) ISO 14912, Gas
33、analysis Conversion of gas mixture composition data 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 14532 and the following apply. 3.1 isolated network network where transmission, distribution and utilization of gas are combined and which is physi
34、cally unconnected to other networks 3.2 entry point point at which gas enters a gas distribution or gas transmission system 3.3 interconnection point physical point connecting adjacent entry-exit systems or connecting an entry-exit system with an interconnector SOURCE: Commission Regulation (EU) No
35、984/2013, modified 3.4 maximum operating pressure maximum pressure at which a network can be operated continuously under normal conditions expressed as absolute pressure Note 1 to entry: Normal conditions are: no fault in any device or stream. SOURCE: EN 1594:2013, 3.23, modified DIN EN 16726:2016-0
36、4 EN 16726:2015 (E) 6 3.5 application equipment that utilizes the transported and distributed gas Note 1 to entry: Some examples of gas applications are: gas appliances (domestic or commercial), processes (chemical or industrial), power plants, vehicles, greenhouses etc. 4 Reference conditions and p
37、ressure units Unless stated otherwise all volumes are given for the real dry gas at ISO standard reference conditions of 15 C (288,15 K) and 1013,25 mbar (101,325 kPa). Unless otherwise stated all pressures are absolute pressures. Whenever data on the volume, gross calorific value (GCV), energy and
38、Wobbe Index are communicated, it shall be specified under which reference conditions these values were calculated. In assessing compliance with this European standard parameters should be determined directly at ISO standard reference conditions. If the properties are only available at other referenc
39、e conditions and the actual gas composition is not known then conversion to ISO standard reference conditions shall be carried out using the procedure described in EN ISO 13443. NOTE Besides the ISO standard reference conditions, particular in gas transmission, normal reference conditions (25/0 C) a
40、re used according to the Network Code Interoperability and Data exchange. These are indicated in Table 1 for information. 5 Requirements Gas shall comply with the requirements given in Table 1 and shall be accepted for conveyance. Table 1 Requirements Parameter Unit Limits based on standard referenc
41、e condition 15 C/15C Limits based on normal reference condition 25C /0C (for information) Reference standards for test methodsd(informative) Min. Max. Min. Max. Relative density no unit 0,555 0,700 0,555 0,700 EN ISO 6976, EN ISO 15970 Total sulfur without odorant mg/m3not applicable 20anot applicab
42、le 21aEN ISO 6326-5, EN ISO 19739 For sulfur in high pressure networks and on interconnection points the maximum acceptable sulfur content for conveyance is 20 mg/m3, where in high pressure networks non-odorized gas is current practice. However, for existing practices with respect to transmission of
43、 odorized gas between high pressure networks higher sulfur content value up to 30 mg/m3may be accepted. NOTE On distribution networks the odorization is considered as a national safety issue. Some information about sulfur odorant content is given in Annex B. Hydrogen sulphide + Carbonyl sulphide (as
44、 sulfur) mg/m3not applicable 5anot applicable 5aEN ISO 6326-1, EN ISO 6326-3, EN ISO 19739 DIN EN 16726:2016-04 EN 16726:2015 (E) 7 Parameter Unit Limits based on standard reference condition 15 C/15C Limits based on normal reference condition 25C /0C (for information) Reference standards for test m
45、ethodsd(informative) Min. Max. Min. Max. Mercaptan sulfur without odorant (as sulfur) mg/m3not applicable 6anot applicable 6aEN ISO 6326-3, EN ISO 19739 Oxygen mol/mol not applicable 0,001 % or 1 % (see below) not applicable 0,001 % or 1 % (see below) EN ISO 6974-3, EN ISO 6974-6, EN ISO 6975 At net
46、work entry points and interconnection points the mole fraction of oxygen shall be no more than 0,001 %, expressed as a moving 24 hour average. However, where the gas can be demonstrated not to flow to installations sensitive to higher levels of oxygen, e.g. underground storage systems, a higher limi
47、t of up to 1 % may be applied. Carbon dioxide mol/mol not applicable 2,5 % or 4 % see below not applicable 2,5 % or 4 % see below EN ISO 6974 parts 1 to 6, EN ISO 6975 At network entry points and interconnection points the mole fraction of carbon dioxide shall be no more than 2,5 %. However, where t
48、he gas can be demonstrated not to flow to installations sensitive to higher levels of carbon dioxide, e.g. underground storage systems, a higher limit of up to 4 % may be applied. Hydro carbon dew pointb,cC not applicable 2 not applicable 2 ISO 23874, ISO/TR 12148 at any pressure from 0,1 to 7 MPa (
49、70 bar) absolute pressure Water dew pointb,cat 7 MPa (70 bar) or, if less than 7 MPa (70 bar), at maximum operating pressure of the system in which the gas flows C not applicable 8 not applicable 8 EN ISO 6327, EN ISO 18453, EN ISO 10101 parts 1 to 3 Methane number no unit 65 not applicable 65 not applicable see normative Annex A Contaminants The gas shall not contain constituents other than listed in Table 1 at levels that prevent its transportation, storage and/o
