1、BSI Standards PublicationBS EN ISO 7291:2010Gas welding equipment Pressure regulators formanifold systems used inwelding, cutting and alliedprocesses up to 30 MPa (300bar)BS EN ISO 7291:2010+A : 5BS EN ISO 7291:2010+A1:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementat
2、ion of EN ISO 7291:2010+A1:2015. It supersedes BS EN ISO 7291:2010 which is withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to ISO text carry the number of the ISO amendment. For example, text altered by ISO amendmen
3、t 1 is indicated by .The UK participation in its preparation was entrusted to Technical Committee WEE/18, Gas welding and cutting appliances.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessar
4、y provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 83368 7ICS 25.160.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was
5、published under the authority of the Standards Policy and Strategy Committee on 31 December 2010.Amendments/corrigenda issued since publicationDate Text affected31 May 2015 Implementation of ISO amendment 1:2015 with CEN endorsement A1:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 729
6、1 November 2010 ICS 25.160.30 Supersedes EN ISO 7291:2001English Version Gas welding equipment - Pressure regulators for manifold systems 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 soud
7、age, le coupage et les techniques connexes jusqu 30 MPa (300 bar) (ISO 7291:2010) Gasschweigerte - Hauptstellendruckregler fr Schweien, 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
8、 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 references concerning such national standards may be obtained on application to the CEN-CENELEC M
9、anagement 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 into its own language and notified to the CEN-CENELEC Management Centre has the same
10、 status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Por
11、tugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN 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 mean
12、s reserved worldwide for CEN national Members. Ref. No. EN ISO 7291:2010: EEN ISO 7291:2010+A1April 2015BS 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 Technica
13、l Committee CEN/TC 121 “Welding” 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 2011, and conflicting national standards shall be withdrawn at the lat
14、est by May 2011. Attention is drawn to the possibility that some 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/CENEL
15、EC 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania
16、, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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. iiBS EN ISO 7291:2010+A1:2015EN ISO 7291:2
17、010+A1:2015 (E)EN ISO 7291:2010/A1:2015 (E) 3 Foreword This document (EN ISO 7291:2010/A1:2015) has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” the secretariat of which is held by DI
18、N. This Amendment to the European Standard EN ISO 7291:2010 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2015, and conflicting national standards shall be withdrawn at the latest by October 2015. Attention is
19、 drawn to the possibility that some 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. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the fol
20、lowing countries are bound to implement this European Standard: 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,
21、 Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 7291:2010/Amd 1:2015 has been approved by CEN as EN ISO 7291:2010/A1:2015 without any modification. Foreword to amendment A1BS EN ISO 7291:2010ISO 729
22、1:2010(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 characteristics .6 6.1 G
23、eneral .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 mechanical resistance of
24、pressure regulators 14 9.5 Test for durability of markings.18 Bibliography19 BS EN ISO 7291:2010+A1:2015ISO 7291:2010+A1:2015 (E) ISO 2015 All rights reserved11BS EN ISO 7291:2010ISO 7291:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a wo
25、rldwide 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 established has the right to be represented o
26、n 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. International Standards are drafted
27、 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. Publication as an International Standa
28、rd 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 patent rights. ISO 7291 was prepared by T
29、echnical 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 official interpretations of any aspect
30、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. BS EN ISO 7291:2010+A1:2015ISO 7291:2010+A1:2015 (E) ISO 2015 All rights reservedivBS EN ISO 7291:2010INTERNATIONAL
31、 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 and test methods for pressure regulators in manifold
32、 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 applicable to pressure regulators fitted directly to
33、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 edition of the referenced document (including any ame
34、ndments) 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 in gas welding, cutting and allied processes ISO 1529
35、6, Gas welding equipment Vocabulary Terms used for gas welding equipment 1) The value 30 MPa relates to maximum cylinder filling pressure at 15 C. ISO 2015 All rights reservedBS EN ISO 7291:2010+A1:2015ISO 7291:2010+A1:2015 (E)ISO 10225, Gas welding equipment Marking for equipment used for gas weldi
36、ng, cutting and allied processesBS 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 gener
37、ally variable inlet pressure to as 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 Interna
38、tional Standard. See Figure 1. Key 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 m
39、anifold assembly of devices generally 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. BS EN ISO 7291:2010+A1:2015ISO 729
40、1:2010+A1:2015 (E)2 ISO 2015 All rights reservedBS 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 standa
41、rd atmosphere3), 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 nitro
42、gen 0,983 0,930 1 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
43、 pressure regulators 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. BS EN ISO 7291:2010+A1:2015ISO 7291:2010+A1:2015 (E) ISO 2015 All rights reservedBS EN ISO 7291:2010ISO 7291:2010(E)
44、 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 burni
45、ng 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 sha
46、ll 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 effec
47、tive 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. 5.2
48、.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 scr
49、ew 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 supplied 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 standa
