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1、BRITISH STANDARD BS EN 730-1:2002 Gas welding equipment Safety devices Part 1: Incorporating a flame (flashback) arrestor The European Standard EN 730-1:2002 has the status of a British Standard ICS 25.160.30 ? Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncont
2、rolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- BS EN 730-1:2002 This British Standard, having been prepared under the direction of the Engineering
3、Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 13 November 2002 BSI 13 November 2002 ISBN 0 580 40732 2 National foreword This British Standard is the official English language version of EN 730-1:2002. Together with BS EN 73
4、0-2:2002 it supersedes BS EN 730:1995 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEE/18, Gas welding appliances, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. C
5、ross-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
6、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. aid enquirers to understand the te
7、xt; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front co
8、ver, an inside front cover, the EN title page, pages 2 to 20, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Copyright British Standards Institution Reprod
9、uced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 730-
10、1 October 2002 ICS 25.160.30 English version Gas welding equipment - Safety devices - Part 1: Incorporating a flame (flashback) arrestor Matriel de soudage aux gaz - Dispositifs de scurit - Partie 1: Avec arrt de flamme Gasschweigerte - Sicherheitseinrichtungen - Teil 1: Mit integrierter Flammensper
11、re This European Standard was approved by CEN on 8 August 2002. 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 re
12、ferences concerning such national standards may be obtained on application to the 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 i
13、nto its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Port
14、ugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN
15、national Members. Ref. No. EN 730-1:2002 E Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Questions or comments about this message: please call the Document Poli
16、cy Group at 303-397-2295. -,-,- EN 730-1:2002 (E) 2 Contents page Foreword3 1Scope 4 2Normative references 4 3Terms and definitions4 4Design and materials.7 4.1Connection .7 4.2Materials7 5Requirements.7 5.1General7 5.2Gas tightness .9 5.3Pressure resistance.9 5.4Flame arrestor9 5.5Flame arrestor wi
17、th non-return valve 9 5.6Flame arrestor with temperature sensitive cut-off valve.9 5.7Flame arrestor with pressure-sensitive cut-off valve 9 5.8Other multifunctional safety devices.10 6Methods for type testing.10 6.1General10 6.2Accuracy of pressure and flow measurements10 6.3Test gases.10 6.4Gas ti
18、ghtness test10 6.5Pressure resistance test .10 6.6Non-return valve test.11 6.7Flame arrestor test.11 6.8Temperature-sensitive cut-off valve test.13 6.9Pressure-sensitive cut-off valve test.14 6.10Internal leakage test for cut-off valves14 7Further tests.14 8Manufacturers instructions14 9Marking .15
19、Annex A (informative) Gas flow measurement17 A.1General17 A.2Procedure .17 Annex B (informative) Third party testing information.19 B.1General19 B.2Samples and documentation19 Annex C (informative) Production tests.20 C.1General20 C.2Production flashback test.20 Copyright British Standards Instituti
20、on Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-1:2002 (E) 3 Foreword This document EN
21、730-1:2002 has been prepared by Technical Committee CEN/TC 121 “Welding“, the secretariat of which is held by DS. 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 April 2003, and conflicting nation
22、al standards shall be withdrawn at the latest by April 2003. This European Standard “Gas welding equipment Safety devices” consists of the following Parts: Part 1: Incorporating a flame (flashback) arrestor. Part 2: Not incorporating a flame (flashback) arrestor. This Part and EN 730-2 supersedes EN
23、 730:1995. Annexes A, B and C are informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Irela
24、nd, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Qu
25、estions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-1:2002 (E) 4 1 Scope This Part of this European Standard specifies the general requirements and tests for safety devices for fuel gases and oxygen or compressed air incorporating a flame (fl
26、ashback) arrestor used downstream of manifold, cylinder and (or) pipeline outlet regulators, and upstream of blowpipes for welding, cutting and allied processes. This standard does not specify the location of these devices in the gas system. This standard does not include requirements for safety dev
27、ices which do not incorporate a flame arrestor which are covered by EN 730-2. This standard does not cover the use of safety devices incorporating flame arrestors for applications with premixed oxy/fuel or air/fuel gas supply systems, for example downstream of gas mixers or a generator to produce hy
28、drogen/oxygen mixture by electrolytic decomposition of water. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed here
29、after. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 560, Gas
30、welding equipment Hose connections for equipment for welding, cutting and allied processes. EN 561, Gas welding equipment Quick-action coupling with shut-off valves for welding, cutting and allied processes. EN 730-2, Gas welding equipment Safety devices Part 2: Not incorporating a flame (flashback)
31、 arrester. EN 29090, Gas tightness of equipment for gas welding and allied processes (ISO 9090:1989). EN 29539, Materials for equipment used in gas welding, cutting and allied processes (ISO 9539:1988). ISO 554, Standard atmospheres for conditioning and/or testing Specifications. 3 Terms and definit
32、ions For the purposes of this European Standard, the following terms and definitions apply. 3.1 flame arrestor device which quenches a flame front EXAMPLEThe good thermal conductivity, high porosity and small pore size (larger surface) of sintered metal elements lead to flame quenching. Copyright Br
33、itish Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-1:2002 (E) 5 K
34、ey 1Normal direction of gas flow 2E.g. sintered metal element 3Flame Figure 1 Flame arrestor (example) 3.2 maximum operating pressure maximum pressure to which the equipment may be subjected in service 3.3 multifunctional safety device device which incorporates two or more of the safety functions EX
35、AMPLEFlame arrestor with non-return valve and cut-off valve. NOTEThe temperature sensitive cut-off valve is normally used in combination with a flame arrestor as its purpose is to cut- off the gas flow before the temperature at the flame arrestor reaches a point where flame transmission across the f
36、lame arrestor takes place. It is normal for pressure and or temperature cut-off valves only to be used in combination with flame arrestors. Due to the burning characteristics of hydrogen it is recommended all flame arrestors for hydrogen incorporate a temperature sensitive cut-off valve. 3.4 non-ret
37、urn valve device which prevents passage of gas in the direction opposite to flow EXAMPLEValve 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. Copyright British Standards Institution Reproduced by IHS
38、 under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-1:2002 (E) 6 Key 1Normal direction of gas flow Figure 2 Non
39、-return valve (example) 3.5 pressure-sensitive cut-off valve device which stops the gas flow in the event of a back-pressure wave from the downstream side EXAMPLEValve is held open, e.g. by a spring; it is actuated by a pressure wave from down-stream and is then automatically held closed by a specia
40、l device. Key 1Normal direction of gas flow 2Back-pressure wave Figure 3 Pressure-sensitive cut-off valve (example) 3.6 temperature-sensitive cut-off valve device which stops the gas flow when a predetermined temperature is exceeded EXAMPLEValve is held open, e.g. by a fusible metal, and actuated by
41、 sustained temperature rise. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Questions or comments about this message: please call the Document Policy Group at 30
42、3-397-2295. -,-,- ? EN 730-1:2002 (E) 7 Key 1Normal direction of gas flow 2E.g. fusible metal Figure 4 Temperature-sensitive cut-off valve (example) 3.7 safety device device for welding equipment which averts risk in case of misuse or malfunction of the down-stream gas welding equipment 4 Design and
43、 materials 4.1 Connection Threaded connections up to G1 shall be in accordance with EN 560. Quick release connections shall be in accordance with EN 561. 4.2 Materials Materials used for safety devices shall conform to the requirements laid down in EN 29539. 5 Requirements 5.1 General Requirements f
44、or each safety device vary depending upon the device and combination of functions in the device. A summary of the requirements and test sequence is given in Table 1. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee
45、=Bureau Veritas/5959906001, 11/08/2004 05:32:29 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-1:2002 (E) 8 Table 1 Summary of requirements and test sequence for the most commonly available safety devices Safety device function(s)
46、Require- ments (Clause No) Tests (in test order) (Clause No) Number of devices required for each test Total number of devices required Flame arrestor5.2.1 5.3 5.4 6.4 External gas tightness 6.5 Pressure resistance 6.7 Flashback resistance 5 1 a 5 6 Flame arrestor + non- return valve 5.2.1 5.2.2 5.3
47、5.5 6.4 External gas tightness 6.5 Pressure resistance 6.6 Reverse flow 6.7 Flashback resistance 6.6 Reverse flow 5 1 a 5 5 5 6 Flame arrestor + temperature sensitive cut-off valve 5.2.1 5.2.2 5.3 5.6 6.4 External gas tightness 6.5 Pressure resistance 6.7 Flashback resistance 6.8 Temperature cut-off 6.10 Internal leakage 5 1a 5 1a 5 7 Flame arrestor + non- return valve + temperature-sensitive cut-off valve 5.2.1 5.2.2 5.3 5.5 5.6 6.4 External gas tightness 6.5 Pressure resistance 6.6 Reverse flow 6.7 Flashback resistance 6.6 Reverse flow 6.8 Temperatu