1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Gas welding equipment - Safety devicesPart 2: Devices not incorporating a flame (flashback) arrestorBS EN ISO 51752:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5175-2 November 2017 ICS 25.160.30 Superse
2、des EN 730-2:2002English Version Gas welding equipment - Safety devices - Part 2: Not incorporating a flame (flashback) arrestor (ISO 5175-2:2017) Matriel de soudage au gaz - Dispositifs de scurit - Partie 2: Sans arrt de flamme (ISO 5175-2:2017) Gasschweigerte - Sicherheitseinrichtungen - Teil 2: O
3、hne integrierte Flammensperre (ISO 5175-2:2017) This European Standard was approved by CEN on 20 November 2017. 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 alt
4、eration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language ma
5、de 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 official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Esto
6、nia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE
7、FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5175-2:2017 ENational f
8、orewordThis British Standard is the UK implementation of EN ISO 51752:2017. It is identical to ISO 51752:2017. It supersedes BS EN 7302:2002, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee WEE/18, Gas welding and cutting appliances.A list of organizat
9、ions 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. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISB
10、N 978 0 580 92471 2ICS 25.160.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2018.Amendments/corrigenda issued since publicationDate Text affectedB
11、RITISH STANDARDBS EN ISO 51752:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5175-2 November 2017 ICS 25.160.30 Supersedes EN 730-2:2002English Version Gas welding equipment - Safety devices - Part 2: Not incorporating a flame (flashback) arrestor (ISO 5175-2:2017) Matriel de soudage
12、au gaz - Dispositifs de scurit - Partie 2: Sans arrt de flamme (ISO 5175-2:2017) Gasschweigerte - Sicherheitseinrichtungen - Teil 2: Ohne integrierte Flammensperre (ISO 5175-2:2017) This European Standard was approved by CEN on 20 November 2017. CEN members are bound to comply with the CEN/CENELEC I
13、nternal 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 or to
14、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 official
15、 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, Nor
16、way, Poland, Portugal, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels 2017 CEN All ri
17、ghts of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5175-2:2017 EBS EN ISO 51752:2017EN ISO 5175-2:2017 (E) 3 European foreword This document (EN ISO 5175-2:2017) has been prepared by Technical Committee ISO/TC 44 “Welding and allied process
18、es” in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” 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 May 2018, and confl
19、icting national standards shall be withdrawn at the latest by May 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 7
20、30-2:2002. 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 Macedonia,
21、France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 5175-2:2017 has been approved by
22、CEN as EN ISO 5175-2:2017 without any modification. BS EN ISO 51752:2017ISO 5175-2:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Design and materials . 34.1 Connections . 34.2 Materials . 35 Requirements 45.1 General . 45.2 Gas tightness . 45.3 Pressure resistance
23、 . 45.4 Non-return valve . 45.5 Pressure relief valves . 55.6 Excess flow cut-off valves 55.7 Flashback resistance 56 Methods for type testing . 56.1 General . 56.2 Accuracy of pressure and flow measurements . 56.3 Test gases . 56.4 Gas tightness test 66.5 Pressure resistance test 66.6 Non-return va
24、lve test . 66.7 Pressure relief valves . 66.8 Excess flow cut-off valve . 66.9 Internal leakage test for cut-off valves . 77 Manufacturers instructions . 78 Marking 7Annex A (informative) Gas flow measurement 9Annex B (informative) Third party testing information .11 ISO 2017 All rights reserved iii
25、Contents PageBS EN ISO 51752:2017ISO 5175-2:2017(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
26、 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 Internationa
27、l Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different t
28、ypes of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not b
29、e held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is inform
30、ation given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WT
31、O) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 8, Equipment for gas welding, cutting and allied processes.This first edition of ISO
32、5175-2, together with ISO 5175-1, cancels and replaces ISO 5175:1987, which has been technically revised. It also incorporates the Amendment ISO 5175:1987/Amd 1:2015.A list of all parts in the ISO 5175 series can be found on the ISO website.Requests for official interpretations of any aspect of this
33、 document should be directed to the Secretariat of ISO/TC 44/SC 8 via your national standards body. A complete listing of these bodies can be found at www.iso.org.iv ISO 2017 All rights reservedBS EN ISO 51752:2017INTERNATIONAL STANDARD ISO 5175-2:2017(E)Gas welding equipment Safety devices Part 2:
34、Devices not incorporating a flame (flashback) arrestor1 ScopeThis document specifies the general requirements and tests for safety devices for fuel gases and oxygen or compressed air which do not incorporate a flame (flashback) arrestor used downstream of manifold, cylinder and/or pipeline outlet re
35、gulators, and upstream of blowpipes for welding, cutting and allied processes.This document does not specify the location of these devices in the gas system.This document in not applicable to safety devices which incorporate a flame arrestor, covered by ISO 5175-1.2 Normative referencesThe following
36、 documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 554, St
37、andard atmospheres for conditioning and/or testing SpecificationsISO 2503, Gas welding equipment Pressure regulators and pressure regulators with flow-metering devices for gas cylinders used in welding, cutting and allied processes up to 300 bar (30 MPa)ISO 5175-1:2017, Gas welding equipment Safety
38、devices Part 1: Incorporating a flame (flashback) arrestorISO 7289, Gas welding equipment Quick-action couplings with shut-off valves for welding, cutting and allied processesISO 7291, Gas welding equipment Pressure regulators for manifold systems used in welding, cutting and allied processes up to
39、30 MPa (300 bar)ISO 9090, Gas tightness of equipment for gas welding and allied processesISO 9539, Gas welding equipment Materials for equipment used in gas welding, cutting and allied processesISO 10225, Gas welding equipment Marking for equipment used for gas welding, cutting and allied processesI
40、SO 15296, Gas welding equipment VocabularyEN 560, Gas welding equipment Hose connections for equipment for welding, cutting and allied processes3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 15296 and the following apply. ISO 2017 All rights reserved
41、 1BS EN ISO 51752:2017ISO 5175-2:2017(E)ISO and IEC maintain terminological databases for use in standardization at the following addresses: ISO Online browsing platform: available at http:/www.iso.org/obp IEC Electropedia: available at http:/www.electropedia.org/3.1excess flow cut-off valvedevice w
42、hich stops the gas flow in the event of flow exceeding a predetermined valueEXAMPLE A valve is held open by a spring; it closes when the force caused by the dynamic pressure becomes greater than the force of the spring. A resetting device is necessary. An example is given in Figure 1.Key1 normal dir
43、ection of gas flowFigure 1 Excess flow cut-off valve (example)3.2maximum operating pressuremaximum pressure to which the equipment may be subjected in service3.3multifunctional safety devicedevice which incorporates two or more of the safety functionsEXAMPLE Non-return valve (3.4) and excess flow cu
44、t-off valve.3.4non-return valvedevice which prevents passage of gas in the direction opposite to flowEXAMPLE A valve is held open by energy in gas stream and closes when downstream pressure is approximately equal to or greater than that in normal direction of flow. An example is given in Figure 2.2
45、ISO 2017 All rights reservedBS EN ISO 51752:2017ISO 5175-2:2017(E)Key1 normal direction of gas flowFigure 2 Non-return valve (example)3.5pressure relief valvedevice which automatically vents gas when the pressure exceeds some predetermined value and seals again when the pressure returns to within sp
46、ecified limits of that valueEXAMPLE A valve is held closed by a spring; it opens when force caused by internal pressure rise exceeds the spring load. An example is given in Figure 3.Figure 3 Pressure relief valve (example)3.6safety devicedevice for welding equipment which averts risk in case of misu
47、se or malfunction of the downstream gas welding equipment4 Design and materials4.1 ConnectionsThreaded connections up to G1 shall be in accordance with EN 560. Quick release connections shall be in accordance with ISO 7289.4.2 MaterialsMaterials used for safety devices shall conform to the requireme
48、nts laid down in ISO 9539. ISO 2017 All rights reserved 3BS EN ISO 51752:2017ISO 5175-2:2017(E)5 Requirements5.1 GeneralA summary of the requirements and test sequence for each device is given in Table 1.Table 1 Summary of requirements and test sequence for safety devicesSafety device function(s)Req
49、uirements (Subclause no.)Tests (in test order) (Subclause no.)Number of devices required for each testTotal number of devices requiredNon-return valve 5.2.1 5.2.2 5.3 5.46.4 External gas tightness 6.5 Pressure resistance 6.6 Reverse flow 6.9 Internal leakage5 1a5 56Pressure relief valve 5.2.1 5.3 5.56.4 External gas tightness 6.5 Pressure resistance 6.7 Relief pressure and flow5 1a56Excess flow cut-off valve5.2.1 5.2.2 5.3 5.66.4 External gas tightness 6.5 Pressure resistance 6.8 Excess f
