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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12732:2000 The Euro
2、pean Standard EN 12732:2000 has the status of a British Standard ICS 25.160.40; 75.200 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Gas supply systems Welding steel pipework Functional requirements This British Standard, having been prepared under the direction of the Engin
3、eering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 July 2000 BSI 07-2000 ISBN 0 580 35141 6 BS EN 12732:2000 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the official English languag
4、e version of EN 12732:2000. The UK participation in its preparation was entrusted by Technical Committee WEE/21, Pipework welding, to Subcommittee WEE/21/7, Field welding of pipelines which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee
5、 any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-refere
6、nces The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue.
7、 A British Standard does not purport to include 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. Summary of pages This document comprises
8、 a front cover, an inside front cover, the EN title page, pages 2 to 49 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. (8523($1?67$1$5 1250(?(8523e(11( (8523b,6 -the pipeline is not located within commercial or industrial premises a
9、s integral part of the industrial process on those premises except for any pipelines and facilities supplying such premises; -the pipework is not located within household installations according to EN 1775:1998; -the design temperature of the system is between -40 ?C and 120 ?C inclusive. With respe
10、ct to production and testing of welds, this European Standard refers to basic standards drafted by CEN/TC 121 and CEN/TC 138 as they exist up to the date of issue of this standard. This standard is not applicable to welds produced prior to the publication of this European Standard. Clauses 4 to 9 de
11、scribe general requirements which relate to all areas of application mentioned. The following clauses contain specific requirements: Clause 10: Supply systems for a maximum operating pressure up to and including 16 bar (distribution). Clause 11: Supply systems for a maximum operating pressure greate
12、r than 16 bar (transmission). Clause 12: Metering, regulating and compressor stations. Page 5 EN 12732:2000 ?%6,? Table 1 assigns the application areas to quality requirement categories as a function of the working pressure and pipe materials used. Table 1: Allocation to quality requirement categori
13、es Quality requirement category Area of activity applies to APressure range and base material Examples of use ? 100 mbar Group 1 according to EN 288-3:1992 RW? ? 360 N/mm? Mains and service pipes in gas distribution systems BPressure range and base material Examples of use 100 mbar ? 5 bar Group 1 a
14、ccording to EN 288-3:1992 RW? ? 360 N/mm 2 Mains and service pipes in gas distribution systems, pipework in stations CPressure range and base material Examples of use 5 bar ? 16 bar Group 1 according to EN 288-3:1992 RW? ? 360 N/mm 2 Pipelines including pipework in stations and gas distribution syst
15、ems DPressure range or base material Examples of use 16 bar* Group 1 to 3 according to EN 288-3:1992 Pipelines including pipework in stations and gas transmission systems NOTE: RW?specified minimum yield strength according to EN 10208-2:1996. *Pipelines having hoop stresses at design pressure up to
16、30 % of specified minimum yield strength and operated at a pressure up to 24 bar can be allocated to quality requirement category C by the pipeline operator. Additional requirements may be specified when, for example: -the strain on pipelines and systems; -the materials; -the line routing; -the desi
17、gn or the welding technique are considered critical. This European Standard specifies common basic principles for gas supply systems. Users of this European Standard should be aware that there can exist more detailed national standards and/or codes of practice in the CEN member countries. This Europ
18、ean Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles. In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this standard
19、, the national legislation/regulation shall take precedence. Page 6 EN 12732:2000 ?%6,? 2Normative 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 and the publ
20、ications are listed hereafter. For dated references, subsequent amendments to or revisions 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 287-1:19
21、97Approval testing of welders - Fusion welding - Part 1: Steels. EN 288-2:1992Specification and approval of welding procedures for metallic materials - Part 2: Welding procedure specification for arc welding. EN 288-3:1992Specification and approval of welding procedures for metallic materials - Part
22、 3: Welding procedure tests for the arc welding of steels. EN 288-5:1994Specification and approval of welding procedures for metallic materials - Part 5: Approval by using approved welding consumables for arc welding. EN 288-6:1994Specification and approval of welding procedures for metallic materia
23、ls - Part 6: Approval related to previous experience. EN 288-7:1995Specification and approval of welding procedures for metallic materials - Part 7: Approval by a standard welding procedure for arc welding. EN 288-8:1995Specification and approval of welding procedures for metallic materials - Part 8
24、: Approval by a pre-production welding test. prEN 288-9Specification and approval of welding procedures for metallic materials - Part 9: Welding procedure test for on land and offshore site butt welding of transmission pipelines. EN 439:1994Welding consumables - Shielding gases for arc welding and c
25、utting. EN 440:1994Welding consumables - Wire electrodes and deposits for gas-shielded metal arc welding of non-alloy and fine-grain steels - Classification. EN 473:1993Qualification and certification of NDT personnel. General principles. EN 499:1994Welding consumables - Covered electrodes for manua
26、l metal arc welding of non-alloy and fine-grain steels - Classification. EN 571-1:1997Non-destructive testing - Penetrant testing - Part 1: General principles. EN 583-1Non-destructive testing - Ultrasonic examination - Part 1: General principles. EN 719:1994Welding coordination - Tasks and responsib
27、ilities. EN 729-1:1994Quality requirements for welding - Fusion welding of metallic materials - Part 1: Guidelines for selection und use. EN 729-2:1994Quality requirements for welding - Fusion welding of metallic materials - Part 2: Comprehensive quality requirements. EN 729-3:1994Quality requiremen
28、ts for welding - Fusion welding of metallic materials - Part 3: Standard quality requirements. EN 729-4:1994Quality requirements for welding - Fusion welding of metallic materials - Part 4: Elementary quality requirements. EN 756:1995Welding consumables - Wire electrodes and wire-flux combinations f
29、or submerged arc welding of non-alloy and fine grain steels Classification. EN 757:1997Welding consumables - Covered electrodes for manual metal arc-welding of high strength steels - Classification. Page 7 EN 12732:2000 ?%6,? EN 758:1997Welding consumables - Tubular cored electrodes for metal arc we
30、lding with or without a gas shield of non-alloy and fine grain steels - Classification. EN 760:1996Welding consumables - Fluxes for submerged arc welding - Classification. EN 970:1997Non-destructive examination of fusion welds - Visual examination. EN 1290:1998Non-destructive examination of welds -
31、Magnetic particle examination of welds. EN 1418:1997Welding personnel - Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials. EN 1435:1997Non-destructive examination of welds - Radiographic examination o
32、f welded joints. EN 1668:1997Welding consumables - Rods, wires and deposits for tungsten inert gas welding of non alloy and fine grain steels - Classification. prEN 1708-1Welding - Basic weld joint details in steel - Part 1: Pressurized components. EN 1714:1997Non-destructive examination of welds -
33、Ultrasonic examination of welded joints. EN 1775:1998Gas supply - Gas pipework for buildings - Maximum operating pressure ? 5 bar - Functional recommendations. EN 10002-1:1990 Metallic materials - Tensile testing - Part 1: Method of test. EN 10204:1995Metallic products - Types of inspection document
34、s. EN 10208-1:1997 Steel pipes for pipelines for combustible fluids - Technical delivery conditions - Part 1: Pipes of requirement class A. EN 10208-2:1996 Steel pipes for pipelines for combustible fluids - Technical delivery conditions - Part 2: Pipes of requirement class B. EN 24063:1992Welding, b
35、razing, soldering and braze-welding of metals - Nomenclature of processes and reference numbers for symbolic representation on drawings (ISO 4063:1990). EN 25817:1992Arc-welded joints in steel - Guidance on quality levels for imperfections (ISO 5817:1992). EN 26520:1991Classification of imperfection
36、s in metallic fusion welds with explanations (ISO 6520:1982). EN 27963:1992Welds in steel - Calibration block No. 2 for ultrasonic examination of welds (ISO 7963:1985). EN 29692:1994Metal-arc welding with covered electrode, gas-shielded metal-arc welding and gas welding - Joint preparations for stee
37、l (ISO 9692:1992). EN 45001:1989General criteria for the operation of testing laboratories. ISO 13686Natural gas - Quality designation. Page 8 EN 12732:2000 ?%6,? 3Definitions and abbreviations For the purposes of this standard, the following definitions apply. Symbols used in formulae are defined w
38、here they occur. 3.1 design temperature (DT): the temperature on which the design calculations are based 3.2 gas: the gaseous fuel which is in a gaseous state at a temperature of 15 ?C under atmospheric pressure (1,013 25 bar absolute) 3.3 gas distribution system: the pipeline system including pipin
39、g above and below ground and all other equipment necessary to supply the gas to the consumer 3.4 gas distributor: the private or public organization authorized to distribute gas to consumers through a gas distribution system 3.5 gas transmission: the activity intended to convey gas from one place to
40、 another through pipelines in order to supply gas to distribution systems or to industrial consumers 3.6 installation: equipment and facilities for the extraction, production, chemical treatment, measurement, control, storage or offtake of the transported gas 3.7 maximum operating pressure (MOP): th
41、e maximum pressure at which a system can be operated continuously under normal conditions NOTE: Normal conditions are: no fault in any device or stream. 3.8 national requirements: requirements following from national legislation or more detailed or stringent national standards 3.9 onshore pipeline:
42、a buried and/or above ground pipeline including those sections laid in or across inland lakes or water courses 3.10 pipeline: a system of pipework with all associated equipment and stations up to the point of delivery. This pipework is mainly below ground but also includes above ground parts 3.11 pi
43、peline components: the elements from which a pipeline is constructed. The following are distinct pipeline elements: -pipe including cold-formed bends; -fittings; EXAMPLE 1: Reducers, tees, factory-made elbows and bends, flanges, caps, welding stubs, mechanical joints. -fabrications, manufactured fro
44、m elements referred above; EXAMPLE 2: Manifolds, slug catchers, pig launching/receiving stations, metering and control runs. -equipment; EXAMPLE 3: Valves, expansion joints, insulating joints, pressure regulators, pumps, compressors. -pressure vessels 3.12 pipeline operator: the private or public or
45、ganization authorized to design, construct, and/or operate and maintain the gas supply system 3.13 pipework: an assembly of pipes and fittings 3.14 pressure: the gauge pressure of the fluid inside the system, measured in static conditions 3.15 station: a plant or facility for the operation and/or pr
46、ocessing of gas supply systems 3.16 test pressure (TP): the pressure to which the gas supply system is subjected, to ensure that it can operate safely Page 9 EN 12732:2000 ?%6,? 4Quality system If required by the pipeline operator, a quality system shall be applied to pipeline welding. A set of reco
47、mmended quality requirements according to EN 729 is provided in Table 2, which specifies the requirements of EN 729 for the different categories as defined in Table 1. Table 2: Recommended quality requirements Quality requirement category in accordance with Table 1 Requirement relating to: ABCD Qual
48、ity system according to: EN 729-1:1994 and EN 729-2:1994(complete)+* EN 729-1:1994 and EN 729-3:1994 (standard)+* EN 729-1:1994 and EN 729-4:1994 (elementary)*- Welding coordination personnel: ?according to EN 719:1994:welding engineer+* welding technician 1) +*- welding specialist 1) +*- ?Foreman w
49、elder with several years technical experience*- Testing personnel according to EN 473:1993* Welding procedure specification (WPS): according to EN 288-2:1992 (except gas welding, procedure no. 311)* Approval of welding procedures according to one of the following standards: EN 288-3:1992 (welding procedure test)+* EN 288-5:1994 (using approved welding consumables)*- EN 288-6:1994 (previous experience)*- EN 288-7:1995 (standard welding procedures) 1) +* EN 288-8:1995 (pre-production welding test)
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