1、BSI Standards PublicationBS EN 12732:2013Gas infrastructure Weldingsteel pipework FunctionalrequirementsCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12732:2013 BRITISH S
2、TANDARDNational forewordThis British Standard is the UK implementation of EN 12732:2013. Itsupersedes BS EN 12732:2000 which is withdrawn.The UK committee voted against this standard for several reasons,particularly because of technical differences with a long establishedUK gas industry standard for
3、 welding procedures, BS 4515, and onthe requirements for the qualification of welding personnel. Alsoseveral improvements requested by the UK gas industry stakeholdersto the draft EN 12732 were not accepted. A full set of UK commentsmay be obtained from BSI Committee Service Centre. The UK willattem
4、pt again to have improvements made when this standard is revised. The UK committee also acknowledges that despite voting against this standard, it can still be used by other UK industries.The UK participation in its preparation was entrusted to TechnicalCommittee GSE/33, Gas supply.A list of organiz
5、ations 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 correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN
6、 978 0 580 69529 2ICS 25.160.40Compliance 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 August 2013.Amendments issued since publicationDate Text affectedCopyright Europe
7、an Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12732:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12732 May 2013 ICS 25.160.40 Supersedes EN 12732:2000English Version Gas infr
8、astructure - Welding steel pipework - Functional requirements Infrastructures gazires - Soudage des tuyauteries en acier - Prescriptions fonctionnelles Gasinfrastruktur - Schweien an Rohrleitungen aus Stahl - Funktionale Anforderungen This European Standard was approved by CEN on 14 March 2013. CEN
9、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 bibliographical references concerning such national standards may be obtained on appli
10、cation 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 the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Man
11、agement 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 Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latv
12、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-100
13、0 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12732:2013: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without licen
14、se from IHS-,-,-BS EN 12732:2013EN 12732:2013 (E) 2 Contents Page Foreword 5 1 Scope 6 2 Normative references 8 3 Terms and definitions 10 4 Quality system 13 4.1 General . 13 4.2 Welding contractors . 14 4.3 Welders 14 4.4 Welding supervisory and coordination personnel 14 4.5 Testing companies and
15、personnel 14 4.5.1 General . 14 4.5.2 Non-destructive testing (NDT) . 14 4.5.3 Destructive testing (DT) . 15 5 Welding consumables 15 6 Production welding. 17 6.1 General requirements . 17 6.1.1 General . 17 6.1.2 Working area . 17 6.1.3 Layout of weld joints 17 6.1.4 Types of weld joints . 17 6.1.5
16、 Joint edge preparation . 17 6.1.6 Weld fit-up . 17 6.1.7 Different wall thickness 17 6.1.8 Pipe branches and nozzles 17 6.1.9 Laminations . 17 6.1.10 Butt welds cross joints 17 6.2 Joint preparation. 18 6.2.1 Pipe end preparation 18 6.2.2 Alignment of the joints . 18 6.3 Preheating . 18 6.4 Tacking
17、 18 6.5 Welding 18 6.6 Actions after welding . 19 6.7 Repair of weld defects 19 7 Special procedures . 19 7.1 General . 19 7.2 Attachment of structural parts 19 7.3 Attachment of cathodic protection connections . 20 7.4 Hot-tapping and other welding work on in-service pipelines 20 8 Inspection of th
18、e weld joint . 20 8.1 General . 20 8.2 Scope of inspection 20 8.3 Non-destructive testing and assessment levels . 23 8.4 Time of inspection 24 8.5 Acceptance criteria . 24 8.6 Recording of test results . 25 9 Documentation 25 Copyright European Committee for Standardization Provided by IHS under lic
19、ense with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12732:2013EN 12732:2013 (E) 3 9.1 General . 25 9.2 Archiving requirements 25 10 Specific requirements for gas infrastructure with a MOP up to and including 16 bar . 25 10.1 General . 25 10.2 Welders
20、 . 25 10.3 Welding supervisory personnel . 26 10.4 Production welding . 26 10.4.1 General . 26 10.4.2 Joint preparation . 26 10.4.3 Welding . 26 10.5 Requirements for records and documentation 26 11 Specific requirements for gas infrastructure with a MOP greater than 16 bar . 27 11.1 General . 27 11
21、.2 Welders . 27 11.3 Welding supervisory personnel . 27 11.4 Qualification of welding procedures . 27 11.4.1 General . 27 11.4.2 Filler material requirements for welding procedure qualification 27 11.4.3 Impact testing 28 11.4.4 Transverse tensile test 28 11.4.5 All-weld-metal tensile test 29 11.5 P
22、roduction welding . 29 11.5.1 General . 29 11.5.2 Joint preparation . 29 11.5.3 Welding . 29 11.5.4 Repairs of weld defects 30 11.5.5 Welding consumables . 30 11.6 Destructive testing of production welds . 30 11.7 Acceptance requirements. 30 11.8 Requirements for records and documentation 31 12 Spec
23、ific requirements for metering, regulating and compressor stations . 32 12.1 General . 32 12.2 Specific requirements . 32 Annex A (informative) Qualification procedure for pipeline welders (Girth welds and branch connections) 33 A.1 General . 33 A.2 Approval test 33 A.2.1 Execution of the approval t
24、est . 33 A.2.2 Range of test pieces 33 A.2.3 Supervision of execution of approval test 34 A.3 Inspection . 34 A.3.1 General . 34 A.3.2 Testing girth welds 35 A.3.3 Testing weldolets 35 A.4 Approval range 35 A.4.1 General . 35 A.4.2 Dimension ranges . 35 A.4.3 Techniques . 35 A.5 Certificate . 36 A.5
25、.1 General . 36 A.5.2 Duration of validity 36 Annex B (informative) Testing of lamination defects 37 Annex C (informative) Time-of-flight diffraction technique (TOFD) . 38 C.1 General . 38 C.2 Additional and substitutional requirements to EN ISO 10863:2011 . 38 C.2.1 Addition to the whole document E
26、N ISO 10863:2011 38 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12732:2013EN 12732:2013 (E) 4 C.2.2 Addition to EN ISO 10863:2011, Clause 3 “Terms and definitions“ 38 C
27、.2.3 Addition to EN ISO 10863:2011, Clause 5, “Examination Levels“ . 40 C.2.4 Addition to EN ISO 10863:2011, 7.2.2, “Ultrasonic probes“ . 40 C.2.5 Substitution of EN ISO 10863:2011, Clause 11, 3rdparagraph “Weld testing“ . 40 C.2.6 Substitution of EN ISO 10863:2011, 12.5.2 “Sizing“ 41 Annex D (infor
28、mative) Critical aspects for hot-tap welding or welding on in-service pipelines . 46 D.1 General . 46 D.2 Recommendations 46 D.2.1 Equipment . 46 D.2.2 Supervision . 46 D.2.3 Safety precautions 46 D.2.4 Identification 46 D.2.5 Filler materials . 46 D.3 Weld preparation. 47 D.4 Welding procedure spec
29、ification (WPS) 47 D.4.1 Description of the WPS 47 D.4.2 Qualification of the WPS 47 D.4.3 Approval of the WPS 47 D.5 Qualification of the welder . 47 D.6 Precautions . 47 D.7 Execution . 48 D.8 Repairs . 48 D.9 WPS qualification record . 48 Annex E (informative) Visual examination of joints 50 E.1
30、General . 50 E.2 Recommendations 50 Annex F (informative) Manual ultrasonic testing of weld joints for wall thickness between approximately 6 mm and 8 mm . 51 F.1 General . 51 F.2 Setting 51 F.2.1 Setting of range . 51 F.2.2 Sensitivity adjustment when using the Distance Gain Size method . 51 Annex
31、G (normative) Acceptance criteria - Recommendations for on-site production welds 55 G.1 General . 55 G.2 Acceptance criteria according to EN ISO 5817 55 G.3 Summary of requirements for defect acceptance levels and defect limits 58 G.3.1 General . 58 G.3.2 Requirements 59 G.4 Method and acceptance cr
32、iteria for ultrasonic inspection assessment . 66 G.4.1 Distance Gain Size method 66 G.4.2 Comparative Element method . 66 G.4.3 General . 67 G.4.4 Assessment of indications using automatic pulse-echo technique . 68 Annex H (informative) Brazing and aluminothermic welding of leads for cathodic protec
33、tion systems 69 H.1 Joining techniques . 69 H.2 Procedure qualification 69 H.3 Operation qualification . 71 H.4 Production joints 71 Annex I (informative) Significant technical changes between this European Standard and the previous edition 72 Bibliography . 74 Copyright European Committee for Stand
34、ardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12732:2013EN 12732:2013 (E) 5 Foreword This document (EN 12732:2013) has been prepared by Technical Committee CEN/TC 234 “Gas infrastructure”, the secretariat of
35、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 November 2013, and conflicting national standards shall be withdrawn at the latest by November 2013. Attention is drawn to the
36、 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 12732:2000. This European Standard has been prepared under mandate M/017 given to C
37、EN by the Commission of the European Communities and the European Free Trade Association. Annex I provides details of significant technical changes between this European Standard and the previous edition. There is a complete suite of functional standards prepared by CEN/TC 234 ”Gas infrastructure“ t
38、o cover all parts from the input of gas to the transmission system up to the inlet connection of the gas appliances, whether for domestic, commercial or industrial purposes. In preparing this standard a basic understanding of gas infrastructure by the user has been assumed. Gas infrastructure is com
39、plex and the importance on safety of its construction and use has led to the development of very detailed codes of practice and operating manuals in the member countries. These detailed statements embrace recognised standards of gas engineering and the specific requirements imposed by the legal stru
40、ctures of the member countries. CEN/TC 234 will continue its work updating this standard to the latest developments at regular intervals. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard:
41、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, Portugal, Romania, Slovakia, Slovenia, Spain, S
42、weden, Switzerland, Turkey and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12732:2013EN 12732:2013 (E) 6 1 Scope This European Standard contains req
43、uirements for the production and testing of weld joints for the installation and modification of onshore steel pipelines and pipework used in gas infrastructure, including in-service pipelines, for all pressure ranges for the carriage of processed, non-toxic and non-corrosive natural gas according t
44、o EN ISO 13686 and for the carriage of non-conventional gases such as injected biomethane, where the pipeline elements are made of unalloyed or low-alloyed carbon steel; the pipeline is not located within commercial or industrial premises as integral part of the industrial process on those premises
45、except for any pipelines and facilities delivering gas to such premises; the pipework is not located within household installations according to EN 1775; the design temperature of the system is between -40 C up to and including 120 C. The onshore steel pipelines and pipework used in gas infrastructu
46、re include in-service pipelines, for all pressure ranges for the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 and for the carriage of non-conventional gases complying with EN ISO 13686, and for which a detailed technical evaluation of the functional requir
47、ements (such as injected biomethane) is performed ensuring there are no other constituents or properties of the gases that can affect the integrity of the pipeline. This standard is not applicable to welds produced prior to the publication of this European Standard. Table 1 assigns the application a
48、reas to quality requirement categories as a function of the working pressure and pipe materials used. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12732:2013EN 12732:201
49、3 (E) 7 Table 1 Allocation to quality requirement categories Quality requirement category Area of activity applies to B Pressure range and base material 5 bar Group 1.1, 1.2 and 1.4 according to CEN ISO/TR 15608 Rt 0,5 360 N/mm2Examples of use: Mains and service pipes in gas distribution systems, pipework in stations C Pressure range
