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SLOVENSKI STANDARD
01-november-2023
Nadomešča:
SIST EN 12952-3:2012
Vodocevni kotli in pomožne napeljave - 3. del: Konstruiranje in izračun tlačno
obremenjenih delov kotla
Water-tube boilers and auxiliary installations - Part 3: Design and calculation for pressure
parts of the boiler
Wasserrohrkessel und Anlagenkomponenten - Teil 3: Konstruktion und Berechnung für
drucktragende Kesselteile
Chaudière à tubes d'eau et installations auxiliaires - Partie 3 : Conception et calcul des
parties sous pression de la chaudière
Ta slovenski standard je istoveten z: EN 12952-3:2022
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12952-3
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 27.040 Supersedes EN 12952-3:2011
English Version
Water-tube boilers and auxiliary installations - Part 3:
Design and calculation for pressure parts of the boiler
Chaudière à tubes d'eau et installations auxiliaires - Wasserrohrkessel und Anlagenkomponenten - Teil 3:
Partie 3 : Conception et calcul des parties sous pression Konstruktion und Berechnung für drucktragende
de la chaudière Kesselteile
This European Standard was approved by CEN on 26 September 2022.
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 national 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 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, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12952-3:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 8
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
4 Symbols and abbreviations . 11
5 General. 11
5.1 Purpose . 11
5.2 Dimensions of pressure parts . 11
5.3 Strength of pressure parts . 12
5.4 Design by analysis . 12
5.5 Cyclic loading . 12
5.6 Other design requirements . 13
5.6.1 General. 13
5.6.2 Access . 14
5.6.3 Drainage and venting . 14
5.7 Design, calculation and test pressures . 14
5.7.1 Design pressure . 14
5.7.2 Calculation pressure . 14
5.7.3 Calculation pressure for pressure differences . 15
5.7.4 Hydrostatic test . 15
5.8 Metal wastage . 16
5.8.1 Internal wastage . 16
5.8.2 External wastage . 16
5.8.3 Requirements . 16
5.8.4 Stress corrosion . 16
5.8.5 Mechanical requirements . 17
5.9 Attachment on pressure parts . 17
5.9.1 Load carrying attachments . 17
5.9.2 Non load carrying attachments . 17
6 Calculation temperature and nominal design stress . 17
6.1 Calculation temperature . 17
6.1.1 General. 17
6.1.2 Circulation boilers . 18
6.1.3 Once-through boilers, superheaters and reheaters . 18
6.1.4 Hot water generators . 18
6.1.5 Temperature allowances for unheated components . 18
6.1.6 Headers . 19
6.1.7 Unheated components . 19
6.1.8 Components protected against radiation . 19
6.1.9 Components heated by convection . 19
6.1.10 Components heated by radiation . 20
6.2 Maximum through-the-wall temperature difference and maximum flue gas
temperature for heated drums and headers . 21
6.2.1 Maximum through-the-wall temperature difference . 21
6.2.2 Headers exposed to flue gas . 21
6.2.3 Allowable deviations . 22
6.3 Design stress. 22
6.3.1 General . 22
6.3.2 Rolled and forged steels . 23
6.3.3 Austenitic steels . 23
6.3.4 Non-alloy and low-alloy cast steel . 24
6.3.5 Nodular graphite cast iron . 24
6.3.6 Design stress for welded connections operating under creep condition . 25
6.3.7 Design stress for test pressure . 25
7 Cylindrical shells of drums and headers under internal pressure . 25
7.1 Shell thickness . 25
7.1.1 Requirements . 25
7.1.2 Required wall thickness including allowances . 26
7.2 Basic calculation . 26
7.2.1 Required wall thickness without allowances . 26
7.2.2 Different thickness . 26
7.2.3 Fabrication tolerances . 26
7.3 Combined stress in drum or header shells . 27
7.3.1 General . 27
7.3.2 Stress from longitudinal loads . 27
7.3.3 Longitudinal bending stress . 28
7.3.4 Evaluation of ligament stress for inclined ligaments in drums . 29
7.4 Boiler drum supports . 30
7.5 Other stresses in cylindrical shells . 31
8 Openings and branches in cylindrical shells of drums and headers and integral tubes
................................................................................................................................................................... 31
8.1 General . 31
8.1.1 Requirements for the ligament efficiency of the main body with openings and
branches . 31
8.1.2 Effective lengths for calculation of efficiencies of components . 36
8.1.3 Conditions for isolated openings . 37
8.1.4 Requirements for design of branches . 37
8.1.5 Requirements for the design of reinforcing pads . 38
8.2 Efficiency factor, calculation by way of approximation, and maximum diameter of
unreinforced openings . 38
8.2.1 General . 38
8.2.2 Allowable efficiency and maximum diameter of unreinforced opening . 38
8.2.3 Isolated openings .
...