1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 7291:2010Gas welding equipment Pressure regulators formanifold systems used inwelding, cutting and alliedprocesses up to 30 MPa (300bar) (ISO 7291:2010)Licensed Copy: W
2、ang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08:50, Uncontrolled Copy, (c) BSIBS EN ISO 7291:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 7291:2010.It supersedes BS EN ISO 7291:2001 which is withdrawn.The UK participation in its preparation was
3、entrusted to TechnicalCommittee WEE/18, Gas welding and cutting appliances.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapp
4、lication. BSI 2010ISBN 978 0 580 59440 3ICS 25.160.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2010.Amendments issued since publicationDate Text
5、affectedLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08:50, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7291 November 2010 ICS 25.160.30 Supersedes EN ISO 7291:2001English Version Gas welding equipment - Pressure regulators for manifold sys
6、tems used in welding, cutting and allied processes up to 30 MPa (300 bar) (ISO 7291:2010) Matriel de soudage aux gaz - Dtendeurs de centrale de bouteilles pour le soudage, le coupage et les techniques connexes jusqu 30 MPa (300 bar) (ISO 7291:2010) Gasschweigerte - Hauptstellendruckregler fr Schweie
7、n, Schneiden und verwandte Prozesse bis 30 MPa (300 bar) (ISO 7291:2010) This European Standard was approved by CEN on 23 October 2010. 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
8、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 any CEN member. This European Standard exists in three official versions (English, French, German). A version
9、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 versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
10、 Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROP
11、EN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7291:2010: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/
12、03/2011 08:50, Uncontrolled Copy, (c) BSIBS EN ISO 7291:2010EN ISO 7291:2010 (E) 3 Foreword This document (EN ISO 7291:2010) has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes“ in collaboration with Technical Committee CEN/TC 121 “Welding” the secretariat of which is he
13、ld 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 2011, and conflicting national standards shall be withdrawn at the latest by May 2011. Attention is drawn to the possibility that som
14、e 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 ISO 7291:2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations o
15、f the following countries are bound to 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, Rom
16、ania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 7291:2010 has been approved by CEN as a EN ISO 7291:2010 without any modification. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08:50, Uncontrolled Copy, (c) BSIBS EN
17、ISO 7291:2010ISO 7291:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Units3 4.1 Pressure .3 4.2 Flow.3 4.3 Temperature.3 5 Manufacturing requirements3 5.1 Materials .3 5.2 Design, machining and assembly4 6 Physical char
18、acteristics .6 6.1 General .6 6.2 Pressures .7 6.3 Flow rates.7 6.4 Operating characteristics .9 7 Marking.10 7.1 Pressure regulator.10 7.2 Pressure relief devices .10 8 Instructions for use.10 9 Type test procedure 11 9.1 General .11 9.2 Test conditions11 9.3 Functional tests.12 9.4 Tests for mecha
19、nical resistance of pressure regulators 14 9.5 Test for durability of markings.18 Bibliography19 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08:50, Uncontrolled Copy, (c) BSIBS EN ISO 7291:2010ISO 7291:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organ
20、ization 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 member body interested in a subject for which a technical committee has been establish
21、ed 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 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
22、 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 International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Pu
23、blication 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 elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such paten
24、t rights. ISO 7291 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 8, Equipment for gas welding, cutting and allied processes. This third edition cancels and replaces the second edition (ISO 7291:1999), which has been technically revised. Requests for off
25、icial interpretations of any aspect of this International Standard 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. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08:50, Uncont
26、rolled Copy, (c) BSIBS EN ISO 7291:2010INTERNATIONAL STANDARD ISO 7291:2010(E) ISO 2010 All rights reserved 1Gas welding equipment Pressure regulators for manifold systems used in welding, cutting and allied processes up to 30 MPa (300 bar) 1 Scope This International Standard specifies requirements
27、and test methods for pressure regulators in manifold systems used in welding, cutting, and allied processes for: a) compressed gases up to 30 MPa1)(300 bar); b) dissolved acetylene; c) liquefied petroleum gases (LPG); d) methylacetylene-propadiene-mixtures (MPS); e) carbon dioxide (CO2). It is not a
28、pplicable to pressure regulators fitted directly to the gas cylinders, as defined in ISO 25032. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest e
29、dition of the referenced document (including any amendments) applies. ISO 5171, Gas welding equipment Pressure gauges used in welding, cutting and allied processes ISO 9090, Gas tightness of equipment for gas welding and allied processes ISO 9539, Gas welding equipment Materials for equipment used i
30、n gas welding, cutting and allied processes ISO 15296, Gas welding equipment Vocabulary Terms used for gas welding equipment 1) The value 30 MPa relates to maximum cylinder filling pressure at 15 C. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08:50, Uncontrolled Copy, (c) BSIBS
31、 EN ISO 7291:2010ISO 7291:2010(E) 2 ISO 2010 All rights reserved3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 15296 and the following apply. 3.1 pressure regulator for manifold systems device for regulating a generally variable inlet pressure to as
32、 constant as possible an outlet pressure when controlling the output of a manifold of cylinders NOTE The diagram of the pressure regulator is an example only. Optional design characteristics are to be compatible with the safety requirements specified in this International Standard. See Figure 1. Key
33、 1 pressure regulator body 2 inlet connector 3 upstream pressure gauge 4 relief valve 5 downstream pressure gauge 6 outlet connector 7 pressure regulator cover 8 pressure adjusting screw Figure 1 Example of pressure regulators and designation of its components 3.2 manifold assembly of devices genera
34、lly linking two or more gas sources coupled to a user pipeline system, delivering a regulated pressure under specified safe conditions NOTE A manifold can include components like collectors, safety devices, and pressure regulators. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08
35、:50, Uncontrolled Copy, (c) BSIBS EN ISO 7291:2010ISO 7291:2010(E) ISO 2010 All rights reserved 34 Units 4.1 Pressure The pressures measured are gauge pressures2)and are expressed in megapascals or bars. 4.2 Flow Flow rates are measured in cubic metres per hour corrected to a standard atmosphere3),
36、taking into account the relevant conversion coefficient for the gas used (see Table 1). Table 1 Conversion coefficient, U Conversion coefficient Test gas air oxygen nitrogen argon hydrogen helium acetylene LPG, e.g. propane CO2air 1 0,950 1,02 0,851 3,81 2,695 1,05 0,800 0,808 nitrogen 0,983 0,930 1
37、 0,837 3,75 2,65 1,03 0,784 0,792 The conversion coefficient, U, is given by Equation (1): 01U = (1) where 0is the density of test gas; 1is the density of gas used. 4.3 Temperature Temperatures are measured in degrees Celsius. 5 Manufacturing requirements 5.1 Materials Materials for pressure regulat
38、ors shall conform to the requirements of ISO 9539. 2) Pressure exceeding atmospheric pressure. 3) A standard atmosphere at 23 C and 0,101 3 MPa (1,013 bar), ISO 5541. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08:50, Uncontrolled Copy, (c) BSIBS EN ISO 7291:2010ISO 7291:2010(E
39、) 4 ISO 2010 All rights reserved5.2 Design, machining and assembly 5.2.1 Oxygen pressure regulators Pressure regulators for oxygen shall be designed and manufactured giving consideration to the possibility of internal ignition. Pressure regulators for oxygen shall not ignite or show evidence of burn
40、ing when submitted to the ignition test in 9.4.4. All components and accessories shall be thoroughly cleaned and degreased before assembly. 5.2.2 Acetylene pressure regulators Pressure regulators shall be designed and constructed in such a way that they withstand acetylene decomposition. The test sh
41、all be carried out in accordance with 9.4.6. 5.2.3 Connections 5.2.3.1 Inlet connections Choice of inlet connections is left to the manufacturers discretion. 5.2.3.2 Outlet connections Choice of outlet connection is left to the manufacturers discretion. 5.2.4 Filter A particle filter, having an effe
42、ctive 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 not be removable without the use of a tool. The filter shall retain particles of size greater than or equal to 0,1 mm. 5.
43、2.5 Pressure-adjusting device This device shall be designed in such a way that it is not possible for the pressure regulator valve to be held in the open position, for example, as a consequence of the spring being compressed fully (to its solid length). If the dimensions of the pressure-adjusting sc
44、rew are such as to prevent the spring becoming fully compressed, then the pressure-adjusting screw shall not be removable. Using the adjusting device, it shall not be possible to obtain a pressure at which the pressure relief device vents. 5.2.6 Pressure gauges The pressure regulator shall be suppli
45、ed with upstream and downstream pressure gauges complying with the functions and safety requirements specified in ISO 5171. Inlet connection threads shall conform to international, regional or national standards for pressure gauges. Pressure gauges shall be designed and constructed in such a way tha
46、t they withstand acetylene decomposition. The test shall be carried out in accordance with 9.4.7. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/03/2011 08:50, Uncontrolled Copy, (c) BSIBS EN ISO 7291:2010ISO 7291:2010(E) ISO 2010 All rights reserved 55.2.7 Gas leakage 5.2.7.1 General The
47、 pressure regulator shall be gastight to the exterior, e.g. to the atmosphere, and internally, i.e. between the high-pressure and low-pressure parts. At all normal pressures for relevant gases, the leakage shall not exceed the limits specified in 5.2.7.2 and 5.2.7.3. 5.2.7.2 External leakage Pressur
48、e regulators shall be gastight to the atmosphere and shall conform to the requirements of ISO 9090. The total leakage shall be less than 10 cm3/h. 5.2.7.3 Internal leakage, qfMaximum allowable internal leakage, qf, in cubic centimetres per hour, of the pressure regulator is a function of its standar
49、d discharge, Q1, in cubic metres per hour (see Figure 2). For Q11 500 m3/h, qf2 MPa (20 bar) 1,2 1,5 p13p25.2.8.2 Pressure retention of the low-pressure side Pressure regulators shall be designed and constructed so that if the low-pressure chamber of the pressure regulator, or intermediate chamber in the case of two-stage pressure regulators, is in direct communication with a full cylinder of gas, for example, the pressure regulator valve is held in the open position and the outlet connection is closed by an attached
