1、March 2012 Translation by DIN-Sprachendienst.English price group 35No 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
2、27.040!$zi“1875870www.din.deDDIN EN 12952-3Water-tube boilers and auxiliary installations Part 3: Design and calculation for pressure parts of the boilerEnglish translation of DIN EN 12952-3:2012-03Wasserrohrkessel und Anlagenkomponenten Teil 3: Konstruktion und Berechnung fr drucktragende Kesseltei
3、leEnglische bersetzung von DIN EN 12952-3:2012-03Chaudires tubes deau et installations auxiliaires Partie 3: Conception et calcul des parties sous pression de la chaudireTraduction anglaise de DIN EN 12952-3:2012-03SupersedesDIN EN 12952-3:2002-05www.beuth.deIn case of doubt, the German-language ori
4、ginal shall be considered authoritative.Document comprises 167 pages02.12 DIN EN 12952-3:2012-03 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 269 “Shell and water-tube boilers” (Secretariat: DIN, Germany). The responsible Ge
5、rman body involved in its preparation was the Normenausschuss Rohrleitungen und Dampfkesselanlagen (Piping and Boiler Plant Standards Committee), Working Committee NA 082-00-18 AA Dampfkesselanlagen. For more detailed information about the Normenausschuss Rohrleitungen und Dampfkesselanlagen (NARD),
6、 please visit www.nard.din.de. Amendments This standard differs from DIN EN 12952-3:2002-05 as follows: a) normative references have been updated; b) figures, equations and symbols have been corrected; c) the method of pressure testing has been revised; d) the requirements for design stress have bee
7、n revised; e) the standard has been editorially revised. Previous editions DIN EN 12952-3: 2002-05 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12952-3December 2011 ICS 27.040 Supersedes EN 12952-3:2001English Version Water-tube boilers and auxiliary installations - Part 3: Design and calcul
8、ation for pressure parts of the boiler Chaudires tubes deau et installations auxiliaires - Partie 3:Conception et calcul des parties sous pression de la chaudire Wasserrohrkessel und Anlagenkomponenten - Teil 3: Konstruktion und Berechnung fr drucktragende KesselteileThis European Standard was appro
9、ved by CEN on 26 November 2011. 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 and bibliographical references concerning such nationa
10、l 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 the responsibility of a CEN member into its own language
11、 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
12、 Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. 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
13、Members. Ref. No. EN 12952-3:2011: EEUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG EN 12952-3:2011 (E) 2 Contents Page Foreword 41 Scope 62 Normative references 63 Terms and definitions .64 Symbols and abbreviations 75 General 75.1 Purpose .75.2
14、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 . 136 Calculation temperature and nominal design stress 136.1 C
15、alculation 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 thickness 227.2 Basic calculation. 237.3 Combined stress in
16、 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 way of approximation, and maximum diameter of unreinforced
17、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 . 579.2 Symbols and abbreviations . 599.3 Required wall thi
18、ckness . 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 of straight boiler tubes 8011.3 Thickness of tube bends and
19、 elbows . 82DIN EN 12952-3:2012-03 EN 12952-3:2011 (E) 3 11.4 Flexibility of 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 a
20、llowable internal pressure 9012.2 Numerical methods . 9113 Fatigue 9213.1 General . 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 .
21、119Annex B (normative) Fatigue cracking Design to allow for fluctuating stress . 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
22、the previous edition . 162Annex ZA (informative) Clauses of this European Standard addressing essential safety requirements of the Pressure Equipment Directive 97/23/EC 163Bibliography 165DIN EN 12952-3:2012-03 EN 12952-3:2011 (E) 4 Foreword This document (EN 12952-3:2011) has been prepared by Techn
23、ical 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 text or by endorsement, at the latest by June 2012, and conflicting national standards sha
24、ll 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 for identifying any or all such patent rights. This document supersedes EN 12952-3:2001.
25、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 Directive 97/23/EC, see informative Annex ZA, which is an integral part of this document.
26、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 consists of the following parts: Part 1: General; Part 2: Materials for pressure parts of
27、 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 boiler; Part 6: Inspection during construction, documentation and marking of pressure parts
28、 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 solid fuels for the boiler; Part 10: Requirements for safeguards against excessive pressure;
29、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; DIN EN 12952-3:2012-03 EN 12952-3:2011 (E) 5 Part 14: Requirements for flue gas DENOX-systems using liqu
30、ified pressurized ammonia and ammonia water solution; 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
31、 operating instructions is currently in preparation. 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
32、this European Standard to be satisfactorily fulfilled. 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 St
33、andards series EN 12952 and EN 12953, see the 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, Cyp
34、rus, 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 the United Kingdom. DIN EN 12952-3:2012-03 EN 12952-3:20
35、11 (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 Standard is to ensure that the hazards associated with water-tube boilers are reduced to a minimum by the proper application
36、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 references, only the edition cited applies. For undated references, the latest edition of the referenced document (including a
37、ny 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, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, Class designated Part 1: Steel fla
38、nges 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 properties perpendicular to the surface of the product Technical delivery conditions EN 10266:2003, Steel tubes, fittings an
39、d 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 12952-2:2011, Water-tube boilers and auxiliary installations Part 2: Materials for pressure parts of boilers and accessories E
40、N 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 installations Part 6: Inspection during construction; documentation and marking of pressure parts of the boiler EN 129
41、52-12:2003, 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 calculation for pressure parts EN 13445-3:2009, Unfired pressure vessels Part 3: Design EN 13480-3:2002, Metallic industria
42、l 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. DIN EN 12952-3:2012-03 EN 12952-3:2011 (E) 7 4 Symbols and abbreviations For the purposes of this document, the symbols given in EN 12952-1:200
43、1, Table 4-1 apply. 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 E
44、uropean Standard. 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 pres
45、sure parts sufficient 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
46、 determined in accordance 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
47、 attachments; e) rapid and frequent changes of pressure and temperature. Methods for calculating stresses caused by external loads applied to nozzles and to attachments shall be in accordance with EN 13445-3:2009. NOTE The purpose of this part is to give specific design rules for common forms of loadings to which boiler parts are normally subjected to and general rules on how other loadings are to be considered. It does not give specific design rules for loadings other than those described in a) to e). These design rules are adequate fo
