EN 13445-3:2021

SLOVENSKI STANDARD
01-september-2021
Nadomešča:
SIST EN 13445-3:2014
SIST EN 13445-3:2014/A1:2015
SIST EN 13445-3:2014/A2:2016
SIST EN 13445-3:2014/A3:2018
SIST EN 13445-3:2014/A4:2018
SIST EN 13445-3:2014/A5:2018
SIST EN 13445-3:2014/A6:2019
SIST EN 13445-3:2014/A7:2019
SIST EN 13445-3:2014/A8:2019
Nekurjene tlačne posode - 3. del: Konstruiranje
Unfired pressure vessels - Part 3: Design
Unbefeuerte Druckbehälter - Teil 3: Konstruktion
Récipients sous pression non soumis à la flamme - Partie 3: Conception
Ta slovenski standard je istoveten z: EN 13445-3:2021
ICS:
23.020.32 Tlačne posode Pressure vessels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 13445-3
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2021
EUROPÄISCHE NORM
ICS 23.020.30 Supersedes EN 13445-3:2014
English Version
Unfired pressure vessels - Part 3: Design
Récipients sous pression non soumis à la flamme - Unbefeuerte Druckbehälter - Teil 3: Konstruktion
Partie 3: Conception
This European Standard was approved by CEN on 24 February 2021.

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, Turkey 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13445-3:2021 E
worldwide for CEN national Members.

Issue 1 (2021-05)
Contents
Page
European foreword . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Symbols and abbreviations . 12
5 Basic design criteria . 14
5.1 General . 14
5.2 Corrosion, erosion and protection . 14
5.3 Load cases . 17
5.4 Design methods . 24
5.5 Thickness calculations (DBF) . 26
5.6 Joint coefficient . 27
5.7 Design requirements of welded joints . 28
6 Maximum allowed values of the nominal design stress for pressure parts . 31
6.1 General . 31
6.2 Steels (except castings), other than austenitic steels covered by 6.4 and 6.5, with a
minimum rupture elongation, as given in the relevant technical specification for the
material, below 30 % . 32
6.3 Alternative route for steels (except castings), other than austenitic steels covered by
6.4 and 6.5, with a minimum rupture elongation, as given in the relevant technical
specification for the material, below 30 % . 32
6.4 Austenitic steels (except castings) with a minimum rupture elongation, A%, as given in
the relevant technical specification for the material, such as 30%≤A%<35% . 33
6.5 Austenitic steels (except castings) with a minimum rupture elongation, A%, as given in
the relevant technical specification for the material, such as A% 35% . 33
6.6 Cast steels. 34
6.7 Nominal design stress of anchor bolting . 35
7 Shells under internal pressure . 35
7.1 Purpose . 35
7.2 Specific definitions . 35
7.3 Specific symbols and abbreviations . 36
7.4 Cylindrical and spherical shells . 36
7.5 Dished ends . 37
7.6 Cones and conical ends . 42
7.7 Nozzles which encroach into the knuckle region . 51
8 Shells under external pressure . 55
8.1 Purpose . 55
8.2 Specific definitions . 55
8.3 Specific symbols and definitions . 56
8.4 General . 59
8.5 Cylindrical shells . 60
8.6 Conical shell . 80
8.7 Spherical shells . 88
8.8 Vessel ends . 89
9 Openings in shells . 89
Issue 1 (2021-05)
9.1 Purpose . 89
9.2 Specific definitions . 90
9.3 Specific symbols and abbreviations . 91
9.4 General . 94
9.5 Isolated openings . 105
9.6 Multiple openings . 123
9.7 Openings close to a shell discontinuity . 134
10 Flat ends . 142
10.1 Purpose . 142
10.2 Specific definitions . 142
10.3 Specific symbols and abbreviations . 143
10.4 Unpierced circular flat ends welded to cylindrical shells . 144
10.5 Unpierced bolted circular flat ends . 151
10.6 Pierced circular flat ends . 154
10.7 Flat ends of non-circular or annular shape . 159
11 Flanges . 163
11.1 Purpose . 163
11.2 Specific definitions . 163
11.3 Specific symbols and abbreviations . 164
11.4 General . 166
11.5 Narrow face gasketed flanges . 170
11.6 Full face flanges with soft ring type gaskets . 186
11.7 Seal welded flanges . 189
11.8 Reverse narrow face flanges . 189
11.9 Reverse full face flanges . 192
11.10 Full face flanges with metal to metal contact . 196
12 Bolted domed ends . 199
12.1 Purpose . 199
12.2 Specific definitions . 199
12.3 Specific symbols and abbreviations . 199
12.4 Gener
...