EN ISO 10156-2010 en Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets (Incorporating Corrigendum September.pdf

1、BS EN ISO10156:2010ICS 23.020.30; 71.100.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDGases and gas mixtures Determination offire potential andoxidizing ability for theselection of cylindervalve outlets (ISO10156:2010)Incorporating corrigendumSeptember 2010

2、This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2010 BSI 2011BS EN ISO 10156:2010National forewordThe UK participation in its preparation was entrusted to Technical Committee PVE/3/1, Gas containers - Valve fittings for gas containers

3、.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 provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from

4、 legal obligations.This British Standard is the UK implementation of EN ISO 10156:2010. It is identical to ISO 10156:2010, incorporating corrigendum September 2010. It supersedes BS EN 720-2:1997 and BS EN ISO 10156-2:2005 which are withdrawn.The start and finish of text introduced or altered by cor

5、rigendum is indicated in the text by tags. Text altered by ISO corrigendum September 2010 is indicated in the text by .Amendments/corrigenda issued since publicationDate Comments 31 January 2011 Implementation of ISO corrigendum September 2010ISBN 978 0 580 72075 8EUROPEAN STANDARD NORME EUROPENNE E

6、UROPISCHE NORM EN ISO 10156 April 2010 ICS 23.020.30; 71.100.20 Supersedes EN 720-2:1996, EN ISO 10156-2:2005English Version Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets (ISO 10156:2010) Gaz et mlanges de gaz - Dterminatio

7、n du potentiel dinflammabilit et doxydation pour le choix des raccords de sortie de robinets (ISO 10156:2010) Gase und Gasgemische - Bestimmung der Brennbarkeid und des Oxidationsvermgens zur Auswahl von Ventilausgngen (ISO 10156:2010) This European Standard was approved by CEN on 18 March 2010. CEN

8、 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 appl

9、ication to the CEN 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre

10、has the same status 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,

11、 Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and

12、 by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 10156:2010: EIncorporates corrigendum September 20103 Foreword This document (EN ISO 10156:2010) has been prepared by Technical Committee ISO/TC 58 “Gas cylinders“ in collaboration with Technical Committee CEN/TC 23 “Transpor

13、table gas cylinders”, the secretariat of which is held by BSI. 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 October 2010, and conflicting national standards shall be withdrawn at the latest by

14、October 2010. 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 720-2:1996, EN ISO 10156-2:2005. This docume

15、nt has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound t

16、o 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, Romania, Slovakia, Slovenia, Spain, Swed

17、en, Switzerland and the United Kingdom. Endorsement notice The text of ISO 10156:2010 has been approved by CEN as a EN ISO 10156:2010 without any modification. BS EN ISO 10156:2010EN ISO 10156:2010 (E)iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Terms, definitions, symbols and units1 2.1 T

18、erms and definitions .1 2.2 Symbols2 2.3 Units3 3 Flammability of gases and gas mixtures in air 3 3.1 General .3 3.2 Test method .3 3.2.1 Key points concerning safety 3 3.2.2 Principle3 3.2.3 Test apparatus and materials.3 3.2.4 Procedure.4 3.2.5 Results for pure gases4 3.3 Calculation method for mi

19、xtures containing n flammable gases and p inert gases.7 3.4 Examples11 3.5 Classification according to the Globally Harmonized System (GHS)12 4 Oxidizing power of gases and gas mixtures 12 4.1 General .12 4.2 Test method .12 4.2.1 Key points concerning safety 12 4.2.2 Principle12 4.2.3 Test apparatu

20、s .13 4.2.4 Procedure.16 4.2.5 Results16 4.3 Calculation method .16 4.3.1 Principle16 4.3.2 Cicoefficients 17 5 Mixtures containing oxygen and flammable gases .18 5.1 General .18 5.2 Basis of flammability classification.20 5.3 Examples22 Annex A (informative) Classification according to the Globally

21、 Harmonized System (GHS) .24 Bibliography25 BS EN ISO 10156:2010EN ISO 10156:2010 (E) BSI 2010iv 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 car

22、ried 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.

23、 ISO collaborates closely with 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 Interna

24、tional Standards. 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. Attention is drawn to the possibility that some of the

25、elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 10156 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder fittings. This third edition of ISO 10156 cancels and re

26、places ISO 10156:1996 and ISO 10156-2:2005. It gives updated data for flammability and oxidizing ability. BS EN ISO 10156:2010EN ISO 10156:2010 (E) BSI 2010vIntroduction ISO 5145 1and other related standards establish practical criteria for the determination of outlet connections of cylinder valves.

27、 These criteria are based on certain physical and chemical properties of the gases. In particular, the flammability in air and the oxidizing ability are considered. One of the potential complications that prompted the development of this International Standard is that whilst there are abundant data

28、in the literature relating to pure gases, differences can be found, depending upon the test methods employed; in the case of gas mixtures, data in the literature are often incomplete or even non-existent. The initial aim of this International Standard was to eliminate the ambiguities in the case of

29、differences in the literature, and above all, to supplement existing data (mainly in the case of gas mixtures). Subsequently, this International Standard was used for other purposes than the selection of cylinder valve outlets, such as establishing flammability and oxidizing potential data for label

30、ling according to international transport regulations and dangerous substances regulations, under the umbrella of the Globally Harmonized System (GHS). BS EN ISO 10156:2010EN ISO 10156:2010 (E) BSI 2010INTERNATIONAL STANDARD 1Gases and gas mixtures Determination of fire potential and oxidizing abili

31、ty for the selection of cylinder valve outlets 1 Scope This International Standard specifies methods for determining whether or not a gas or gas mixture is flammable in air and whether a gas or gas mixture is more or less oxidizing than air under atmospheric conditions. This International Standard i

32、s intended to be used for the classification of gases and gas mixtures including the selection of gas cylinder valve outlets. This International Standard does not cover the safe preparation of these mixtures under pressure and at temperatures other than ambient. 2 Terms, definitions, symbols and uni

33、ts 2.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1.1 gas or gas mixture flammable in air gas or gas mixture that is ignitable in air at atmospheric pressure and a temperature of 20 C 2.1.2 lower flammability limit in air minimum content of

34、a gas or gas mixture in an homogeneous mixture with air at which a flame just starts to propagate NOTE 1 The lower flammability limit is determined at atmospheric conditions. NOTE 2 The term “flammability limit”, as used in this International Standard, is sometimes called “explosion limit”. 2.1.3 up

35、per flammability limit in air maximum content of a gas or gas mixture in an homogeneous mixture with air at which a flame just starts to propagate NOTE 1 The upper flammability limit is determined at atmospheric conditions. NOTE 2 The term “flammability limit”, as used in this International Standard

36、, is sometimes called “explosion limit”. 2.1.4 flammability range range of concentration between the lower and upper flammability limits NOTE The term “flammability range”, as used in this International Standard, is sometimes also called “explosion range”. BS EN ISO 10156:2010EN ISO 10156:2010 (E) B

37、SI 20102 2.1.5 gas or gas mixture more oxidizing than air gas or gas mixture that is able, at atmospheric pressure, to support the combustion more than a reference oxidizer consisting of 23,5 % oxygen in nitrogen 2.1.6 oxidizing power OP oxidizing potential dimensionless number that compares the oxi

38、dizing capability of a gas mixture to that of oxygen NOTE OP is calculated as the sum of the products of the mole fraction(s) of each oxidizing component times its coefficient of oxygen equivalency, Ci. 2.2 Symbols Aimolar fraction of the i thflammable gas in a gas mixture, in % Bkmolar fraction of

39、the k thinert gas in a gas mixture, in % Cicoefficient of oxygen equivalency Fii thflammable gas in a gas mixture Ikk thinert gas in a gas mixture n number of flammable gases in a gas mixture p number of inert gases in a gas mixture Kkcoefficient of equivalency of an inert gas relative to nitrogen (

40、see Table 1) iA equivalent content of a flammable gas Lilower flammability limit in air of a flammable gas Tcimaximum content of flammable gas which, when mixed with nitrogen, is not flammable in air, in % ximolar fraction of the oxidizing component, in % He helium Ar argon Ne neon Kr krypton Xe xen

41、on N2nitrogen H2hydrogen O2oxygen CO2carbon dioxide SO2sulfur dioxide N2O nitrous oxide SF6sulfur hexafluoride CF4carbon tetrafluoride C3F8octafluoropropane CH4methane BS EN ISO 10156:2010EN ISO 10156:2010 (E) BSI 201032.3 Units For the purposes of this International Standard all gas percentages (%)

42、 are given as molar fractions (mol. %) which are equivalent to volume fractions (vol. %) under normal atmospheric conditions. 3 Flammability of gases and gas mixtures in air 3.1 General Subclauses 3.2 and 3.3 give a test method and a calculation method for determining whether a gas or gas mixture is

43、 flammable in air. The test method (given in 3.2) may be used in all cases but shall be used when Tci(or Li) values are not available. The calculation method (given in 3.3) may only be used if reliable Tci(or Li) values are available. 3.2 Test method 3.2.1 Key points concerning safety Tests shall be

44、 carried out by trained and competent personnel working in accordance with authorized procedures (see also 3.2.4). The reaction tube and flowmeter shall be adequately screened to protect personnel in the event of an explosion. Personnel shall wear personal protective equipment including safety glass

45、es. During the ignition sequence, the reaction tube shall be open to the atmosphere and isolated from the gas supply. Care shall also be taken during the analysis of the test gas or mixture. 3.2.2 Principle The gas or gas mixture is mixed in the desired proportions with air. In the quiescent test mi

46、xture, an ignition is initiated using an electric spark, and it is observed whether or not a flame propagates through the reaction tube. 3.2.3 Test apparatus and materials The apparatus (see Figure 1) includes: a mixer; a tube in which the reaction takes place; an ignition system; a system of analys

47、is to determine the test-gas composition. NOTE Alternative equivalent apparatus may be used, as described in standard test methods for the determination of explosion limits, e.g. EN 1839 2and ASTM E 681 3. 3.2.3.1 Preparation 3.2.3.1.1 Test gas The test gas shall be prepared to represent the most fl

48、ammable composition that can occur in the normal course of production. The criteria to be used in establishing the composition of the test gas are manufacturing tolerances, i.e. the test gas shall contain the highest concentration of flammable gases encountered in the normal manufacturing process an

49、d the moisture content shall be less than or equal to 0,01 %. The test gas shall be thoroughly mixed and carefully analysed to determine the exact composition. BS EN ISO 10156:2010EN ISO 10156:2010 (E) BSI 20104 3.2.3.1.2 Compressed air The compressed air shall be analysed and the moisture content shall be less than or equal to 0,01 %. 3.2.3.1.3 Test gas/air mixture The compressed air and the gas to be tested are mixed in a blender, controlling the flowrates. The air-flammable gas mixture shall be analysed using a chromatograph or a simple oxygen