1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12952-3:2011Water-tube boilers andauxiliary installationsPart 3: Design and calculation for pressureparts of the boilerCopyright European Committee for Standardization Prov
2、ided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12952-3:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12952-3:2011.It supersedes BS EN 12952-3:2001 which is withdrawn.The UK partic
3、ipation in its preparation was entrusted to TechnicalCommittee PVE/2, Water Tube And Shell Boilers.A list of organizations 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 respon
4、sible for its correctapplication. The British Standards Institution 2012ISBN 978 0 580 63553 3ICS 23.020.01; 27.040; 27.060.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Co
5、mmittee on 31 January 2012.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12952-3:2011EUROPEAN STANDARD NORME EUROPENN
6、E EUROPISCHE NORM EN 12952-3 December 2011 ICS 27.040 Supersedes EN 12952-3:2001English Version Water-tube boilers and auxiliary installations - Part 3: Design and calculation for pressure parts of the boiler Chaudires tubes deau et installations auxiliaires - Partie 3: Conception et calcul des part
7、ies sous pression de la chaudire Wasserrohrkessel und Anlagenkomponenten - Teil 3: Konstruktion und Berechnung fr drucktragende KesselteileThis European Standard was approved by CEN on 26 November 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the con
8、ditions 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 Management Centre or to any CEN member. This European Standard exis
9、ts 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 status as the official versions. CEN members are the national sta
10、ndards 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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and
11、 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12952-3
12、:2011: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12952-3:2011EN 12952-3:2011 (E) 2 Contents Page Foreword 41 Scope 62 Normative references 63 Terms and definitions .
13、64 Symbols and abbreviations 75 General 75.1 Purpose .75.2 Dimensions of pressure parts 75.3 Strength of pressure parts 85.4 Design by analysis.85.5 Cyclic loading .85.6 Other design requirements .95.7 Design, calculation and test pressures 105.8 Metal wastage 125.9 Attachment on pressure parts . 13
14、6 Calculation temperature and nominal design stress 136.1 Calculation temperature . 136.2 Maximum through-the-wall temperature difference and maximum flue gas temperature for heated drums and headers 186.3 Design stress 187 Cylindrical shells of drums and headers under internal pressure 227.1 Shell
15、thickness 227.2 Basic calculation. 237.3 Combined stress in drum or header shells 237.4 Boiler drum supports . 277.5 Other stresses in cylindrical shells 278 Openings and branches in cylindrical shells of drums and headers and integral tubes . 278.1 General . 278.2 Efficiency factor, calculation by
16、way of approximation, and maximum diameter of unreinforced openings . 358.3 Design of openings and branches in cylindrical shells (efficiency and reinforcement) . 388.4 Bolted connections. 488.5 Screwed and socket welded connections 559 Headers and plain tubes of rectangular section . 579.1 General
17、. 579.2 Symbols and abbreviations . 599.3 Required wall thickness . 6010 Ends and spherical shells 6310.1 Symbols and abbreviations . 6310.2 Spherical shells and dished heads . 6310.3 Unstayed flat ends 7210.4 Flat unstayed closures . 7811 Tubes . 8011.1 Symbols and abbreviations . 8011.2 Thickness
18、of straight boiler tubes 8011.3 Thickness of tube bends and elbows . 82Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12952-3:2011EN 12952-3:2011 (E) 3 11.4 Flexibility of
19、 integral tubing systems 8411.5 Structural attachments to tubes 8411.6 Fitting and joining of heated tubes 8911.7 Joining of unheated tubes 8912 Pressure parts of irregular shape 9012.1 Hydrostatic test for determining the allowable internal pressure 9012.2 Numerical methods . 9113 Fatigue 9213.1 Ge
20、neral . 9213.2 Symbols and abbreviations 9313.3 Exemption rule for fatigue analysis . 9513.4 Stress analysis for fatigue calculation 10513.5 Example calculations 114Annex A (normative) Calculation of tube bends and elbows . 119Annex B (normative) Fatigue cracking Design to allow for fluctuating stre
21、ss . 129Annex C (informative) Examples of calculating the effects of fatigue 145Annex D (informative) Physical properties of steels . 152Annex E (informative) Significant technical changes between this European Standard and the previous edition . 162Annex ZA (informative) Clauses of this European St
22、andard addressing essential safety requirements of the Pressure Equipment Directive 97/23/EC 163Bibliography 165Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12952-3:2011
23、EN 12952-3:2011 (E) 4 Foreword This document (EN 12952-3:2011) has been prepared by Technical Committee CEN/TC 269 “Shell and water-tube boilers”, 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 t
24、ext or by endorsement, at the latest by June 2012, and conflicting national standards shall be withdrawn at the latest by June 2012. 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
25、for identifying any or all such patent rights. This document supersedes EN 12952-3:2001. This document 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 D
26、irective 97/23/EC, see informative Annex ZA, which is an integral part of this document. Annex E provides details of significant technical changes between this European Standard and the previous edition. The European Standard series EN 12952 concerning water-tube boilers and auxiliary installations
27、consists of the following parts: Part 1: General; Part 2: Materials for pressure parts of boilers and accessories; Part 3: Design and calculation for pressure parts of the boiler; Part 4: In-service boiler life expectancy calculations; Part 5: Workmanship and construction of pressure parts of the bo
28、iler; Part 6: Inspection during construction, documentation and marking of pressure parts of the boiler; Part 7: Requirements for equipment for the boiler; Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler; Part 9: Requirements for firing systems for pulverized soli
29、d fuels for the boiler; Part 10: Requirements for safeguards against excessive pressure; Part 11: Requirements for limiting devices of the boiler and accessories; Part 12: Requirements for boiler feedwater and boiler water quality; Part 13: Requirements for flue gas cleaning systems; Copyright Europ
30、ean Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12952-3:2011EN 12952-3:2011 (E) 5 Part 14: Requirements for flue gas DENOX-systems using liquified pressurized ammonia and ammonia water so
31、lution; Part 15: Acceptance tests; Part 16: Requirements for grate and fluidized-bed firing systems for solid fuels for the boiler; CR 12952 Part 17: Guideline for the involvement of an inspection body independent of the manufacturer. NOTE 1 A Part 18 on operating instructions is currently in prepar
32、ation. Although these parts may be obtained separately, it should be recognized that the parts are inter-dependent. As such, the design and manufacture of water-tube boilers requires the application of more than one part in order for the requirements of this European Standard to be satisfactorily fu
33、lfilled. NOTE 2 Part 4 and Part 15 are not applicable during the design, construction and installation stages. NOTE 3 A “Boiler Helpdesk“ has been established in CEN/TC 269 which may be contacted for any questions regarding the application of European Standards series EN 12952 and EN 12953, see the
34、following website: http:/www.boiler-helpdesk.din.de According to the CEN/CENELEC 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
35、, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license wit
36、h CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12952-3:2011EN 12952-3:2011 (E) 6 1 Scope This European Standard specifies the requirements for the design and calculation of water-tube boilers as defined in EN 12952-1. The purpose of this European Standa
37、rd is to ensure that the hazards associated with water-tube boilers are reduced to a minimum by the proper application of the design according to this part of EN 12952. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated referen
38、ces, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1092-1:2007, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 1: Steel flanges EN 1759-1:2004, Fl
39、anges and their joints Circular flanges for pipes, valves, fittings and accessories, Class designated Part 1: Steel flanges NPS to 24 EN 10028-1:2007+A1:2009, Flat products made of steels for pressure purposes Part 1: General requirements EN 10164:2004, Steel products with improved deformation prope
40、rties perpendicular to the surface of the product Technical delivery conditions EN 10266:2003, Steel tubes, fittings and structural hollow sections Symbols and definitions of terms for use in product standards EN 12952-1:2001, Water-tube boilers and auxiliary installations Part 1: General EN 12952-2
41、:2011, Water-tube boilers and auxiliary installations Part 2: Materials for pressure parts of boilers and accessories EN 12952-5:2011, Water-tube boilers and auxiliary installations Part 5: Workmanship and construction of pressure parts of the boiler EN 12952-6:2011, Water-tube boilers and auxiliary
42、 installations Part 6: Inspection during construction; documentation and marking of pressure parts of the boiler EN 12952-12:2003, Water-tube boilers and auxiliary installations Part 12: Requirements for boiler feedwater and boiler water quality EN 12953-3:2002, Shell boilers Part 3: Design and calc
43、ulation for pressure parts EN 13445-3:2009, Unfired pressure vessels Part 3: Design EN 13480-3:2002, Metallic industrial piping Part 3: Design and calculation 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12952-1:2001 apply. Copyright European Commi
44、ttee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12952-3:2011EN 12952-3:2011 (E) 7 4 Symbols and abbreviations For the purposes of this document, the symbols given in EN 12952-1:2001, Table 4-1 app
45、ly. Throughout this European Standard, additional terminology and symbols have been included where necessary to meet the requirements of the specific text concerned. 5 General 5.1 Purpose Water-tube boiler pressure parts shall be designed in accordance with the requirements of this European Standard
46、. The resulting designs shall be reproduced in the form of approved drawings and specifications to ensure the proper application of the design requirements during the manufacturing and inspection stages. 5.2 Dimensions of pressure parts The wall thickness and other dimensions of pressure parts suffi
47、cient to withstand the calculation pressure at calculation temperature for the design lifetime shall be determined in accordance with this European Standard using materials in accordance with EN 12952-2:2011. The design for loadings arising from the following situations shall also be determined in a
48、ccordance with this European Standard: a) the bending of a drum or header as a beam under self weight and imposed loads; b) local support loads on drums; c) thermally induced forces and moments within or arising from systems of integral tubing; d) local loading of tubes by structural attachments; e) rapid and frequent changes of pressure a
