1、BRITISH STANDARD Shell boilers Part 4: Workmanship and construction of pressure parts of the boiler The European Standard EN 129534:2002 has the status ofa British Standard ICs 27.060.30; 27.100 BS EN 1 295 3 -4 2002 WkNb A%“ U- rn% E rn NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYR
2、IGHT LAW $ present to the responsible international/European committee 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
3、 this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by u
4、sing the “Search”faci1ity ofthe BSI Electronic Catalogue or ofBritish Stan dards Online. This publication does not purport to include all the necessary provisions of a contract. Users of this publication are responsible for their correct application. Compliance with a British Standard does not ofits
5、elf confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 44, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendment
6、s issued since publication Amd.No. I Date I Comments O BSI 14 June 2002 ISBN O 580 39850 I EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12953-4 May 2002 ICs 27.060.30; 27.100 English version Shell boilers - Part 4: Workmanship and construction of pressure parts of the boiler Chaudires tubes
7、de fume - Partie 4: Fabrication et construction des parties sous pression des chaudires Growasserraumkessel - Teil 4: Verarbeitung und Bauausfhrung fr drucktragende Kesselteile This European Standard was approved by CEN on 15 May 2002 CEN members are bound to comply with the CENKENELEC Internal Regu
8、lations 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 Management Centre or to any CEN member. This Eur
9、opean 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 Management Centre has the same status as the official versions. CEN members are the natio
10、nal standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT E
11、UROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12953-4:2002 E EN 12953-412002 (E) Contents Page 1 2 3 4 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.
12、1 O 5.1 1 5.12 5.13 5.14 5.1 5 5.1 6 Scope 4 Normative references 4 Terms and definitions 4 Symbols 4 General requirements 5 General 5 Material identification 5 Cylindrical shells . 5 Tell-tale holes . 8 End plates and tube plates . 8 Plain tubes and stay tubes 8 Manhole frames and openings . 9 Conn
13、ections for mountings 9 Cylindrical furnaces . 9 Water-cooled reversal chamber . 11 Stays I1 Design of welded joints . 11 Openings in or adjacent to welds 13 Post-weld heat treatment and other heat treatments . 18 Fillet Welds . 13 Fabrication 13 Annex A (informative) Typical examples of acceptable
14、weld details . 21 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives 43 Bibliography 44 2 EN 12953-412002 (E) Foreword This document (EN 12953-4:2002) has been prepared by Technical Committee CEN/TC 269 “Shell and water-tub
15、e boilers“, the secretariat of which is held by DIN. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informativ
16、e Annex ZA, which is an integral part of this standard. 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 2002, and conflicting national standards shall be withdrawn at the latest by Novemb
17、er 2002. This European Standard EN 12953 concerning shell boilers consists of the following Parts: - Part I: General. - Part 2: Materials for pressure parts of boilers and accessories. - Part 3: Design and calculation for pressure parts. - Part 4: Workmanship and construction of pressure parts of th
18、e boiler. - Part 5: Inspection during construction, documentation and marking of pressure parts of the boiler. - Part 6: Requirements for equipment for the boiler. - Part 7: Requirements for firing systems for liquid and gaseous fuels for the boiler. - Part 8: Requirements for safeguards against exc
19、essive pressure. - Part 9: Requirements for limiting devices of the boiler and accessories. - Part IO: Requirements for boiler feedwater and boiler water quality. - Part I I: Acceptance tests. - Part 12: Requirements for firing systems for solid fuels for the boiler. - Part 13: Special requirements
20、for stainless steel boiler servicing sterilizer. CR 12953- 14: Guidelines for the involvement of an inspection body independent of the manufacturer. Although these Parts can be obtained separately, it should be recognized that the Parts are inter-dependent. As such, the design and manufacture of she
21、ll boilers requires the application of more than one Part in order for the re- quirements of the standard to be satisfactorily fulfilled. Annex A of this European Standard is informative. According to the CENKENELEC Internal Regulations, the national standards organizations of the following coun- tr
22、ies are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Swe- den, Switzerland and the United Kingdom. 3 EN 12953-412002 (E) 1 Scope This Part of t
23、his European Standard specifies requirements for the workmanship and construction of shell boilers as defined in EN 12953-1. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appro
24、priate places in the text, and the publications 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 publi
25、cation referred to applies (including amendments). EN 287-1, Approval testing of welders - Fusion welding - Part I: Steels. EN 288-3, Specification and approval of welding procedures for metallic materials - Part 3: Welding procedure tests for the arc welding of steels. EN 1 O1 1-2, Welding - Recomm
26、endations for welding of metallic materials - Part : Arc welding of ferritic steels. EN 141 8, Welding personnel - Approval testing of welding operators for fusion welding and resistance weld set- ters for fully mechanized and automatic welding of metallic materials. prEN 1021 6-2, Seamless steel tu
27、bes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties. prEN 1021 7-2, Welded steel tubes for pressure purposes - Technical delivery conditions - Part2: Electric welded non-alloy and alloy steel tubes with sp
28、ecified elevated temperature properties. prEN 1021 7-5, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties. EN 12953-1 :2002. Shell boilers - Part I: General. EN 12953-
29、3:2002, Shell boilers - Part 3: Design and calculation for pressure parts. EN 12953-52002 Shell boilers - Part 5: Inspection during construction, documentation and marking of pressure parts of the boiler. 3 Terms and definitions For the purposes of this European Standard the terms and definitions gi
30、ven in EN 12953-1 shall apply. 4 Symbols For the purposes of this European Standard the symbols given in EN 12953-1:2002, Table 4-1 shall apply. 4 EN 12953-412002 (E) 5 General requirements 5.1 General 5.1.1 parts, and shall be used in conjunction with the specific requirements applicable to the gra
31、des of materials used. The rules in this Part are applicable to all aspects of fabrication, including welding, of boilers and boiler 5.1.2 All welding shall be in accordance with the requirements of this standard. 5.1.3 proved (see 5.15.3). For category I boilers, approval shall not be mandatory. Fo
32、r category II, III and IV boilers, all welders or welding operators and welding procedures shall be ap- 5.1.4 The manufacturer of a boiler, or boiler part, built in accordance with the requirements of this European Standard, shall be responsible for the welding done by his workmen. The manufacturer
33、shall designate a compe- tent welding supervisor and also conduct the tests for the approval of the welding procedures used. No production work shall be undertaken on categoryI1, III and IV boilers until both the welding procedures and the welders or welding operators have been approved (see 5.1 5.3
34、). 5.1.5 The manufacturer shall maintain a record of the results of welding procedure and welding approval tests. 5.1.6 appropriate record shall be made. If hand stamping is employed, only low-stress stamps shall be used. The welds made by each welder shall be marked with a stamp showing the welders
35、 identity or some other NOTE Low-stress stamps are those with radiused edges or those making a series of dots. 5.1.7 If, during the construction of a boiler or pressure part, the work is not satisfactory or is not in accordance with the requirements of this European Standard, the causes shall be inv
36、estigated by the manufacturer and recti- fied. If necessary, requalification tests shall be undertaken and this shall be recorded. 5.2 Material identification In laying out and cutting the material, the material identification shall be so located as to be clearly visible when the pressure part is co
37、mpleted. Alternatively, for materials that cannot be stamped, or for small multiple parts, or non- pressure parts, the manufacturer shall operate a documented system that ensures material traceability for all mate- rials in the completed boiler. If the materials identification is unavoidably cut out
38、 during manufacture, it shall be transferred by the pressure part manufacturer to another part of the component. The transfer of the identification shall be carried out by a person designated by the manufacturer. The method of transferring the original identifica- tion shall not contravene the requi
39、rements of the material specification. 5.3 Cylindrical shells 5.3.1 plate. The bending shall be performed entirely by machine, and local heating or hammering shall not be used. Each ring shall be formed from not more than two plates, bent to cylindrical form to the extreme ends of the 5.3.2 The shel
40、l of completed boilers shall be in accordance with the following requirements. a) Straightness Unless otherwise shown on the drawing, the maximum deviation of the shell from a straight line shall not ex- ceed 0,3 % both of the total cylindrical length and of any 5 m length. Measurements shall be mad
41、e to the sur- face of the parent plate and not to a weld, fitting, or other raised part; b) Irregularities in profile 1) Gradual local departures from circularity Irregularities in profile (checked by a 20“ gauge) shall not exceed 2 % of the gauge length. 5 EN 12953-412002 (E) Wall thickness e e3 3e
42、6 6e9 9e NOTE This maximum value can be increased by 25 % if the length of the irregularities does not exceed one quar- ter of the length of the shell part between two circumferential seams, with a maximum of 1 m. Greater irregularities re- quire proof by calculation or strain gauge measurement that
43、 the stresses are permissible. Maximum permitted peaking 13 23 3,O el3 2) Peaking at welded seams If an irregularity in profile occurs at the welded seam and is associated with “flats“ adjacent to the weld, the irregularity in profile or “peaking“ shall not exceed the values given in Table 5.3-1. A
44、conservative method of measurement (covering peaking and ovality) shall be by means of a 20“ profile gauge or template. The use of such a profile gauge shall be in accordance with Figure 5.3-1. Two readings shall be taken, Pl and P2, on each side of the seam at any particular location, the peaking i
45、s taken as being equivalent to 0,25 (P1+P2), or P3. 6 EN 12953-412002 (E) Key a Cut out in gauge to clear weld reinforcement a) 20“ profile gauge U c A b) Reading 1 c) Reading 2 A d) Negative peaking (flat) Figure 5.3-1 - Profile gauge and its method of use c) Departure from circularity The differen
46、ce between the maximum and minimum internal diameter of any section of a shell welded longitu- dinally shall not exceed (D+1250)/200, where D is the nominal internal diameter expressed in millimetres. Measurements shall be made to the surface of the parent plate and not to the weld, fitting or other
47、 raised part. Shell sections shall be measured for departure from circularityeither when laid flat on their sides or when set up on end. If the shell sections are checked when laid flat, each measurement for diameter shall be repeated after turning the shell through 90“ about its longitudinal axis.
48、The two measurements for each diameter shall be averaged to give the out-of-roundness. Any local departure from circularity shall be gradual. 7 EN 12953-412002 (E) d) Cold rolling Cold rolling of a welded shell to rectify a small departure from circularity shall be permitted, provided that non-destr
49、uctive testing conforming to EN 12953-5:2002, 5.3 is carried out after the departure from circularity has been remedied. 5.4 Tell-tale holes Reinforcing plates and saddles of nozzles attached to the outside of a boiler shall be provided with at least one tell-tale hole that may be tapped (maximum size G %) for a preliminary leakage test for tightness of welds that seal off the inside of the boiler. These tell-tale holes may be left open or may be plugged when the boiler is in service. If the holes are plugged, the plugging material used shall not be capable o
