1、December 2015 English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.060.40; 25.160.30!%Izq“23887
2、78www.din.deDIN EN ISO 7291Gas welding equipment Pressure regulators for manifold systems used in welding, cutting and allied processes up to 30 MPa (300 bar) (ISO 7291:2010 + Amd 1:2015);English version EN ISO 7291:2010 + A1:2015,English translation of DIN EN ISO 7291:2015-12Gasschweigerte Hauptste
3、llendruckregler fr Schweien, Schneiden und verwandte Prozesse bis 30 MPa (300 bar) (ISO 7291:2010 + Amd 1:2015);Englische Fassung EN ISO 7291:2010 + A1:2015,Englische bersetzung von DIN EN ISO 7291:2015-12Matriel de soudage aux gaz Dtendeurs de centrale de bouteilles pour le soudage, le coupage et l
4、es techniques Version anglaise EN ISO 7291:2010 + A1:2015,Traduction anglaise de DIN EN ISO 7291:2015-12SupersedesDIN EN ISO 7291:2011-03www.beuth.deDocument comprises 27 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.connexes
5、 jusqu 30 MPa (300 bar) (ISO 7291:2010 + Amd 1:2015);11.15 DIN EN ISO 7291:2015-12 2 A comma is used as the decimal marker. National 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 C
6、ommittee CEN/TC 121 “Welding and allied processes” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Schweien und verwandte Verfahren (DIN Standards Committee Welding and Allied Processes), Working Group NA 092-00-07 AA Ausrstung zum Gasschw
7、eien, Schneiden und verwandte Prozesse. This standard includes Amendment A1 approved by CEN on 05 March 2015. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. The DIN Standards corresponding to the International Standards referred to in this docume
8、nt are as follows: ISO 2503 DIN EN ISO 2503 ISO 5171 DIN EN ISO 5171 ISO 9090 DIN ISO 9090 ISO 9539 DIN EN ISO 9539 Amendments This standard differs from DIN EN ISO 7291:2011-03 as follows: a) International Standard ISO 10255 has been included in the normative references; b) in Subclause 7.1, item e
9、) has been updated and Table 5 has been deleted; c) in the German version, various translation errors have been corrected; d) the standard has been editorially revised. Previous editions DIN 8545: 1981-09 DIN EN 961: 1995-10 DIN EN ISO 7291: 2001-11, 2011-03 DIN EN ISO 7291:2015-12 3 National Annex
10、NA (informative) Bibliography DIN EN ISO 2503, Gas welding equipment Pressure regulators and pressure regulators with flow-metering devices for gas cylinders used in welding, cutting and allied processes up to 300 bar (30 MPa) DIN EN ISO 5171, Gas welding equipment Pressure gauges used in welding, c
11、utting and allied processes DIN ISO 9090, Gas tightness of equipment for gas welding and allied processes DIN EN ISO 9539, Gas welding equipment Materials for equipment used in gas welding, cutting and allied processes DIN EN ISO 7291:2015-12 4 This page is intentionally blank EUROPEAN STANDARD NORM
12、E EUROPENNE EUROPISCHE NORM EN ISO 7291 November 2010 + A1 April 2015 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 + Amd 1:2015) Matriel de
13、 soudage aux gaz - Dtendeurs de centrale debouteilles pour le soudage, le coupage et les techniques connexes jusqu 30 MPa (300 bar) (ISO 7291:2010 + Amd 1:2015) Gasschweigerte - Hauptstellendruckregler fr Schweien, Schneiden und verwandte Prozesse bis 30 MPa (300 bar) (ISO 7291:2010 + Amd 1:2015) EN
14、 ISO 7291:2010 was approved by CEN on 2010-10-23 and Amendment A1:2015 on 2015-03-05. 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
15、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 in any other language made by translation under th
16、e 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 Republic, Denmark, Estonia, Finland, Former Yugos
17、lav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN
18、DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7291:2010 + A1:2015 EContents Page Foreword to EN ISO 7291:2010 31 Scope5
19、 2 Normative references5 3 Terms and definitions .6 4 Units 74.1 Pressure .7 4.2 Flow.7 4.3 Temperature.7 5 Manufacturing requirements7 5.1 Materials .7 5.2 Design, machining and assembly8 6 Physical characteristics . 10 6.1 General . 10 6.2 Pressures . 11 6.3 Flow rates. 11 6.4 Operating characteri
20、stics . 13 7 Marking.14 7.1 Pressure regulator.14 7.2 Pressure relief devices .14 8 Instructions for use.15 9 Type test procedure 15 9.1 General .15 9.2 Test conditions15 9.3 Functional tests.16 9.4 Tests for mechanical resistance of pressure regulators 18 9.5 Test for durability of markings.22 Bibl
21、iography 23EN ISO 7291:2010 + A1:2015 (E) 2 !Foreword to EN ISO 7291:2010/A1:2015 .4DIN EN ISO 7291:2015-12 Foreword to EN ISO 7291:2010 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
22、 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 latest by May 2011. A
23、ttention 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/CENELEC Internal Regula
24、tions, 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, Luxembourg, Malt
25、a, 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. EN ISO 7291:2010 + A1:2015 (E) 3DIN EN ISO 7291:2015-12 !For
26、eword to EN ISO 7291:2010/A1:2015 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 DIN. This Amendment to
27、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 drawn to the possibi
28、lity 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 following countries are
29、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, Norway, Poland, Port
30、ugal, 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. EN ISO 7291:2010 + A1:2015 (E) 4 DIN EN ISO 7291:2015-12 “1 Scope This
31、International Standard specifies requirements 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-mixtur
32、es (MPS); e) carbon dioxide (CO2). It is not applicable 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
33、 applies. For undated references, the latest edition 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 we
34、lding equipment Materials for equipment used in 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. !ISO 10225, Gas welding equipment Marking for equipment
35、 used for gas welding, cutting and allied processes“ EN ISO 7291:2010 + A1:2015 (E) 5DIN EN ISO 7291:2015-12 3 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 regulat
36、ing a generally 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 t
37、his International 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 compo
38、nents 3.2 manifold 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. EN ISO 7291:2010 + A1:2
39、015 (E) 6 DIN EN ISO 7291:2015-12 4 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), taking into account the relevant conversion coefficient for the
40、 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 0,837 3,75 2,65 1,03 0,784 0,792 The conversion coefficient, U
41、, 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 regulators shall conform to the requirements of ISO 9539. 2) Pressure
42、exceeding atmospheric pressure. 3) A standard atmosphere at 23 C and 0,101 3 MPa (1,013 bar), ISO 5541. EN ISO 7291:2010 + A1:2015 (E) 7DIN EN ISO 7291:2015-12 5.2 Design, machining and assembly 5.2.1 Oxygen pressure regulators Pressure regulators for oxygen shall be designed and manufactured giving
43、 consideration to the possibility of internal ignition. Pressure regulators for oxygen shall not ignite or show evidence of burning 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 regulat
44、ors Pressure regulators shall be designed and constructed in such a way that they withstand acetylene decomposition. The test shall 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
45、 connections Choice of outlet connection is left to the manufacturers discretion. 5.2.4 Filter A particle filter, having an effective 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
46、 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. 5.2.5 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 exam
47、ple, as a consequence of the spring being compressed fully (to its solid length). If the dimensions of the pressure-adjusting screw 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 possi
48、ble 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 standards for pressure gauges. Pressure gauges shall be designed and constructed in such a way that they withstand acetylene decomposition. The test shall be carried out i
