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1、BRITISH STANDARD BS EN 730-2:2002 Gas welding equipment Safety devices Part 2: Not incorporating a flame (flashback) arrestor The European Standard EN 730-2:2002 has the status of a British Standard ICS 25.160.30 ? Copyright British Standards Institution Reproduced by IHS under license with BSI - Un
2、controlled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:45 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- BS EN 730-2:2002 This British Standard, having been prepared under the direction of the Engineer
3、ing 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 40733 0 National foreword This British Standard is the official English language version of EN 730-2:2002. Together with BS E
4、N 730-1:2002 it supersedes BS EN 730:1995 which is withdrawn.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 secretar
5、y. 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 Catalo
6、gue 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 th
7、e text; 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 fron
8、t cover, an inside front cover, the EN title page, pages 2 to 14, 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 Re
9、produced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:45 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN
10、730-2 October 2002 ICS 25.160.30 English version Gas welding equipment - Safety devices - Part 2: Not incorporating a flame (flashback) arrestor Matriel de soudage aux gaz - Dispositifs de scurit - Partie 2: Sans arrt de flamme Gasschweigerte - Sicherheitseinrichtungen - Teil 2: Ohne integrierte Fla
11、mmensperre 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 bibliograp
12、hical references 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
13、member into 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, Norw
14、ay, Portugal, 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
15、for CEN national Members. Ref. No. EN 730-2:2002 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 05:32:45 MST Questions or comments about this message: please call the Docum
16、ent Policy Group at 303-397-2295. -,-,- EN 730-2:2002 (E) 2 Contents page Foreword3 1Scope 4 2Normative references 4 3Terms and definitions4 4Design and materials.6 4.1Connections .6 4.2Materials6 5Requirements.7 5.1General7 5.2Gas tightness .7 5.3Pressure resistance.7 5.4Non-return valve 8 5.5Press
17、ure relief valves8 5.6Excess flow cut-off valves8 5.7Flashback resistance.8 6Methods for type testing.8 6.1General8 6.2Accuracy of pressure and flow measurements8 6.3Test gases.8 6.4Gas tightness test9 6.5Pressure resistance test .9 6.6Non-return valve test.9 6.7Pressure relief valves9 6.8Excess flo
18、w cut-off valve9 6.9Internal leakage test for cut-off valves10 7Manufacturers instructions10 8Marking .10 Annex A (informative) Gas flow measurement12 A.1General12 A.2Procedure .12 Annex B (informative) Third party testing information.14 B.1General14 B.2Samples and documentation14 Copyright British
19、Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:45 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-2:2002 (E) 3 Forewor
20、d This document EN 730-2:2002 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
21、 conflicting national 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
22、730-1 supersedes EN 730:1995. Annexes A and B 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
23、, Iceland, Ireland, 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
24、 05:32:45 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-2:2002 (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 which do
25、not incorporate a flame (flashback) 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
26、requirements for safety devices which incorporate a flame arrestor which are covered by EN 730-1. 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,
27、and the publications are listed hereafter. 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
28、(including amendments). EN 560, Gas 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 730-1:2002, Gas welding equipment Safety devices Part
29、 1: Incorporating a flame (flashback) arrestor. 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). EN ISO 2503, Gas welding equipment Pressure regulators for g
30、as cylinders used in welding, cutting and allied processes up to 300 bar (ISO 2503:1998). EN ISO 7291, Gas welding equipment - Pressure regulators for manifold systems used in welding, cutting and allied processes up to 300 bar (ISO 7291:1999). ISO 554, Standard atmospheres for conditioning and/or t
31、esting Specifications. 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 excess flow cut-off valve device which stops the gas flow in the event of flow exceeding a predetermined value EXAMPLEValve is held open by a spring; it closes wh
32、en the force caused by the dynamic pressure becomes greater than the force of the spring. A resetting device is necessary. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:3
33、2:45 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-2:2002 (E) 5 Key 1Normal direction of gas flow Figure 1 Excess flow cut-off valve (example) 3.2 maximum operating pressure maximum pressure to which the equipment may be subjected
34、 in service 3.3 multifunctional safety device device which incorporates two or more of the safety functions EXAMPLENon-return valve and excess flow cut-off valve. 3.4 non-return valve device which prevents passage of gas in the direction opposite to flow EXAMPLEValve is held open by energy in gas st
35、ream 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 under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:45 M
36、ST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-2:2002 (E) 6 Key 1Normal direction of gas flow Figure 2 Non-return valve (example) 3.5 pressure relief valve device which automatically vents gas when the pressure exceeds some predeter
37、mined value and seals again when the pressure returns to within specified limits of that value EXAMPLEValve is held closed by a spring; it opens when force caused by internal pressure rise exceeds the spring load. Figure 3 Pressure relief valve (example) 3.6 safety device device for welding equipmen
38、t which averts risk in case of misuse or malfunction of the down-stream gas welding equipment 4 Design and materials 4.1 Connections 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
39、 devices shall conform to the requirements laid down in EN 29539. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:45 MST Questions or comments about this message: please
40、 call the Document Policy Group at 303-397-2295. -,-,- ? EN 730-2:2002 (E) 7 5 Requirements 5.1 General A 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 devices Safety device function(s) Require- ments (
41、Clause No) Tests (in test order) (Clause No) Number of devices required for each test Total number of devices required Non-return valve5.2.1 5.2.2 5.3 5.4 6.4 External gas tightness 6.5 Pressure resistance 6.6 Reverse flow 6.9 Internal leakage 5 1 a 5 5 6 Pressure relief valve5.2.1 5.3 5.5 6.4 Exter
42、nal gas tightness 6.5 Pressure resistance 6.7 Relief pressure and flow 5 1 a 5 6 Excess flow cut-off valve 5.2.1 5.2.2 5.3 5.6 6.4 External gas tightness 6.5 Pressure resistance 6.8 Excess flow cut-off 6.9 Internal leakage 5 1 a 5 5 6 a Use a new device for this test. Do not use for any other test.
43、NOTEIn the following sub-clauses, the terms “upstream” and “downstream” refer to the normal direction of gas flow in the device. 5.2 Gas tightness 5.2.1External gas tightness The general requirements on external gas tightness and the test procedures shall be in accordance with EN 29090. 5.2.2Interna
44、l Gas Tightness Where internal gas tightness is required in this standard the leakage rate shall not exceed 50 cm3/h for devices with a connection internal bore (diameter) less than 11 mm or 0,41 d2 for larger diameters (for tests see 6.6 and/or 6.9). NOTEThe value 0,41 d2 is the flow in cm3/h where
45、 d is the internal bore (diameter) in mm of the largest connection of the device. 5.3 Pressure resistance The housings of the safety devices shall resist a pressure equal to ten times the maximum operating pressure, with the test pressure in all cases not less than 60 bar1). 1) 1 bar = 0,1 MPa = 105
46、Pa 1 Pa = 1 N/m2 All pressures are gauge pressure. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/08/2004 05:32:45 MST Questions or comments about this message: please call the Docum
47、ent Policy Group at 303-397-2295. -,-,- ? EN 730-2:2002 (E) 8 When the device is tested in accordance with 6.5, no permanent deformation of the pressure retaining components shall occur after a test duration of at least 5 min. 5.4 Non-return valve Non-return valve shall not allow the reverse flow of gases when tested in accordance with 6.6. 5.5 Pressure relief valves The opening pressure of the pressure relief valve shall be between 1,3 and 2 times the maximum operating pressure specified by the manufacturer and the valve shall close at a pressure between 1 and 2 times