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1、BRITISH STANDARD BS EN 961:1996 Gas welding equipment Manifold regulators used in welding, cutting and allied processes up to 200 bar The European Standard EN 961:1995 has the status of a British Standard ICS 23.060.40; 25.160.10 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00
2、:00 2006, Uncontrolled Copy, (c) BSI BS EN 961:1996 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1996 BSI 11-1999 The following BSI references relate to the
3、work on this standard: Committee reference WEE/18 Draft for comment 92/86390 DC ISBN 0 580 23731 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee WEE/18, Gas welding and cutting appliances, upon which the following bodie
4、s were represented: British Compressed Gases Association British Railways Board Consumer Policy Committee of BSI Health and Safety Executive LP Gas Association Railway Industry Association South Bank University Welding Manufacturers Association (BEAMA Ltd.) Amendments issued since publication Amd. N
5、o.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 961:1996 BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 9613 List of referencesInside back cover Licensed Copy
6、: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 961:1996 ii BSI 11-1999 National foreword This British Standard has been prepared by Technical Committee WEE/18, and is the English language version of EN 961:1995 Gas welding equipment Manifold regul
7、ators used in welding, cutting and allied processes up to 200 bar published by the European Committee for Standardization (CEN). It is assumed that the execution of the provision of the document is entered to suitably qualified and experienced persons. A British Standard does not purport to include
8、all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard EN 562:1994BS EN
9、562:1995 Gas welding equipment. Pressure gauges used in welding, cutting and allied processes EN 585:1994BS EN 585:1995 Gas welding equipment. Pressure regulators for gas cylinders used in welding, cutting and allied processes up to 200 bar EN 29090:1992BS EN 29090:1992 Specification for gas tightne
10、ss of equipment for gas welding and allied processes EN 29539:1992BS EN 29539:1992 Specification for materials for equipment used in gas welding, cutting and allied processes Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to
11、14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00:00 2006, Uncontroll
12、ed Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 961 August 1995 ICS 23.060.40; 25.160.10 Descriptors: Welding equipment, gas welding, gas cutting, compressed gas, acetylene, pressure regulators, gas cylinders, specifications, design, safety, equipment specifications, performanc
13、e evaluation, tests, marking English version Gas welding equipment Manifold regulators used in welding, cutting and allied processes up to 200 bar Matriel de soudage aux gaz Dtendeurs des centrales de bouteilles (de gaz industriels) pour le soudage, le coupage et les techniques connexes jusqu 200 ba
14、r Gasscheweigerte Haupstellendruckregler fr Schweien, Schneiden und verwandte Verfahren bis 200 bar This European Standard was approved by CEN on 1995-04-08. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the
15、 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 Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German)
16、. 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France,
17、Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 A
18、ll rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 961:1995 E Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 961:1995 BSI 11-1999 2 Foreword This Europea
19、n Standard has been prepared by Subcommittee 7, Equipment for gas welding, cutting and allied processes, of Technical Committee CEN/TC 121, Welding, of which the secretariat is held by DS. It is based on ISO 7291:1990 Welding, cutting and allied processes Manifold regulators, but amended considering
20、 EN 585 on pressure regulators for gas cylinders up to 200 bar. 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 February 1996, and conflicting national standards shall be withdrawn at the latest b
21、y February 1996. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland
22、, United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definition3 4Physical characteristics3 4.1Pressures3 4.2Flow rates3 4.3Coefficients3 5Units4 5.1Pressures4 5.2Flow rate4 5.3Temperatures4 6Design and safety requirements5 6.1General5 6.2Design requirements5 6.3Functional chara
23、cteristics6 7Type tests7 7.1General test conditions7 7.2Performance and functional tests7 7.3Mechanical tests10 7.4Leakage tests10 7.5Ignition test for oxygen manifold regulators10 8Instruction for use11 Page 9Marking12 9.1Regulator12 9.2Relief valve12 Annex A (informative) Decomposition test for ma
24、nifold regulators used for acetylene13 Figure 1 Typical dynamic expansion curves4 Figure 2 Flow rate characteristics4 Figure 3 Manifold regulator5 Figure 4 Allowable internal leakage rates8 Figure 5 Example of test set-up for the measurement of the maximum flow rate, Qmax8 Figure 6 Example of test s
25、et-up for plotting the dynamic curve for outlet pressure9 Figure 7 Test bench for ignition test11 Figure 8 Test interval12 Figure A.1 Test bench for decomposition test 13 Table 1 Conversion coefficients, U5 Table 2 Pressure7 Table 3 Test pressures11 Table 4 Code letters for gases to be used for mark
26、ing of regulators12 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 961:1995 BSI 11-19993 1 Scope This standard specifies requirements and test methods for manifold regulators for welding, cutting and allied processes. It is applicable to
27、 regulators normally used for compressed gases up to 200 bar (20 MPa), for dissolved acetylene, methylacetylene-propadiene-mixtures (MPS) and carbon dioxide (CO2), to regulate the pressure at the outlet of high-pressure lines from manifold gas cylinders. It is not applicable to regulators fitted dir
28、ectly to the gas cylinders, as defined in EN 585 or to regulators for liquefied petroleum gases. 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 an
29、d the publications are listed hereafter. For dated references, subsequent amendments to or revision 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. EN
30、 562, Gas welding equipment Pressure gauges used in welding, cutting and allied processes. EN 585, Gas welding equipment Pressure regulators for gas cylinders used in welding, cutting and allied processes up to 200 bar. EN 29090, Gas tightness of equipment for gas welding and allied processes. (ISO
31、9090:1989) EN 29539, Materials for equipment used in gas welding, cutting and allied processes. (ISO 9539:1988) ISO 554:1976, Standard atmospheres for conditioning and/or testing Specifications. 3 Definition For the purposes of this standard, the following definition applies. 3.1 manifold regulator
32、device for regulating a generally variable inlet pressure to as constant as possible an outlet pressure, and intended to equip a manifold of cylinders 4 Physical characteristics 4.1 Pressures 4.1.1 Nominal (maximum) inlet pressure, p1 Nominal (maximum) upstream pressure for which the manifold regula
33、tor is designed. 4.1.2 Nominal (maximum) outlet pressure, p2 Nominal (maximum) downstream pressure corresponding to the nominal discharge, Q1, indicated by the manufacturer. 4.1.3 Upstream pressure for type testing, p3 The pressure, in bar, given by the equation: p3 = 2p2 + 1 bar. 4.1.4 Stabilized o
34、utlet pressure; stabilization pressure, p4 The pressure recorded 1 min after discharge ceases, with the pressure regulator set to the standard initial conditions p2, p3, Q1. 4.1.5 Highest or lowest outlet pressure, p5 The highest or lowest value of the outlet pressure during the test for i in which
35、the inlet pressure varies from p1 to p3 for a flow equal to the nominal discharge Q1 indicated by the manufacturer (see Figure 1). 4.2 Flow rates 4.2.1 Maximum discharge, Qmax The maximum flow rate obtained at pressures p3 and p2. At these conditions the stabilized outlet pressure p4 shall not excee
36、d the allowable value given in 4.3.1 (see Figure 2): 4.2.2 Nominal discharge, Q1 The maximum flow rate for the manifold regulator defined by the manufacturer for a particular gas (see Figure 2). Q1 may not be less than 0,5 Qmax. 4.3 Coefficients 4.3.1 Coefficient of pressure increase upon closure, R
37、 The coefficient given by the equation: for acetylene regulator p2 = p2R. The resulting value shall be in conformity with R k 0,5. 4.3.2 Irregularity coefficient, i The coefficient given by the equation: i =for acetylene regulator p2 = p2i. The resulting value shall be in conformity with 0,3 k i k +
38、 0,5. R p4p2 p2 -= p5p2 p2 - Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 961:1995 4 BSI 11-1999 5 Units 5.1 Pressures Pressures specified in this standard are gauge pressures1). They are expressed in bar (or in pascals or multiples th
39、ereof) at normal conditions2). 5.2 Flow rate Flow rates are measured in cubic metres per hour (m3/h) at normal conditions2) taking into account the corrections for the relevant gas (see Table 1). Conversion coefficient, U, based on the formula: where 0 is the specific weight of the gas; 1 is the spe
40、cific weight of gas used. 5.3 Temperatures Temperatures are measured in degrees Celsius. Figure 1 Typical dynamic expansion curves Figure 2 Flow rate characteristics 1) Pressure exceeding the atmospheric pressure. 2) Nominal conditions are: 23C and 1,013 bar (0,1013 MPa) according to ISO 554. U 0 1
41、- -= Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 961:1995 BSI 11-19995 Table 1 Conversion coefficients, U 6 Design and safety requirements 6.1 General Figure 3 shows a manifold regulator as an illustration only. Optional design charac
42、teristics shall be compatible with the safety requirements specified in this standard. 6.2 Design requirements 6.2.1 Materials Materials used for the construction of regulators shall comply with the requirements specified in EN 29539. 6.2.2 Design and manufacture 6.2.2.1 Oxygen manifold regulators O
43、xygen manifold regulators shall be so designed, machined and assembled as to avoid the risk of internal burning and shall comply with the requirements specified in 7.5. All components and accessories shall be thoroughly cleaned and degreased before assembly. 6.2.2.2 Acetylene manifold regulators Man
44、ifold pressure regulators used for acetylene shall be designed and constructed in such a way that they withstand a decomposition of acetylene. The test can be carried out in accordance with Annex A. Other equivalent tests can also be used. Test gasConversion coefficient airoxygennitrogenargonhydroge
45、nheliumacetyleneCO2 air10,9501,020,8523,812,6951,050,809 nitrogen0,9830,93010,8373,752,651,030,792 Figure 3 Manifold regulator Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:43:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 961:1995 6 BSI 11-1999 6.2.2.3 Filter A dust filter having an e
46、ffective cross-section compatible with the discharge shall be mounted within or directly fitted to the pressure regulator upstream of the pressure regulator valve. The filter shall retain particles greater than or equal to 0,1 mm. 6.2.2.4 Inlet connections Choice of inlet connections for manifold re
47、gulators is left to the manufacturers discretion. If cylinder valve connections are used, they shall conform to the relevant national standard. 6.2.2.5 Outlet connections Choice of outlet connection is left to the manufacturers discretion. 6.2.2.6 Pressure regulator cover The manifold regulator shal
48、l be designed and assembled in such a way that, if the low pressure chamber or the intermediate chamber (in the case of a two-stage regulator) is subjected to direct full cylinder pressure, for example if the regulator valve is jammed in the open position or if the outlet union is closed (for exampl
49、e by a valve or a seal), high pressure gas is either contained or is vented safely without ejecting component parts. Pneumatically controlled regulators, in which the diaphragm is held by the pressure of the control gas, shall comply with the safety requirements. 6.2.2.7 Relief valve 6.2.2.7.1 General All manifold regulators shall be supplied with a relief valve designed to vent excess outlet pressure. NOTEAcetylene regulators are excluded from the requirement
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