I.S. EN 13445-3:2021

Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Basic design criteria
6 Maximum allowed values of the nominal design stress for pressure parts
minimum rupture elongation, as given in the relevant technical specification for the
material, below 30 %
specification for the material, below 30 %
the relevant technical specification for the material, such as 30%≤A%<35%
the relevant technical specification for the material, such as A% 35%
7 Shells under internal pressure
8 Shells under external pressure
9 Openings in shells
10 Flat ends
11 Flanges
12 Bolted domed ends
13 Heat Exchanger Tubesheets
14 Expansion bellows
15 Pressure vessels of rectangular section
16 Additional non-pressure loads
17 Simplified assessment of fatigue life
18 Detailed assessment of fatigue life
19 Creep design
20 Design rules for reinforced flat walls
21 Circular flat ends with radial reinforcement ribs
22 Static analysis of tall vertical vessels on skirts
Annex A (normative) Design requirements for pressure bearing welds
Annex B (normative) Design by Analysis – Direct Route
Annex C (normative) Design by analysis — Method based on stress categories
Annex D (informative) Verification of the shape of vessels subject to external pressure
Annex E (normative) Procedure for calculating the departure from the true circle of cylinders
and cones
Annex F (normative) Allowable external pressure for vessels outside circularity tolerance
Annex G (normative) Alternative design rules for flanges and gasketed flange connections
Annex H (informative) Gasket factors m and y
Annex I (normative) Additional information on heat exchanger tubesheet design
Annex J (normative) Alternative method for the design of heat exchanger tubesheets
Annex K (informative) Additional information on expansion bellows design
Annex L (informative) Basis for design rules related to additional non-pressure loads
Annex M (informative) In service monitoring of vessels operating in fatigue or creep service
Annex N (informative) Bibliography to Clause 18
Annex O (informative) Physical properties of steels
Annex P (normative) Classification of weld details to be assessed using principal stresses
Annex Q (normative) Simplified procedure for the fatigue assessment of unwelded zones
Annex R (informative) Coefficients for creep-rupture model equations for extrapolation of
creep-rupture strength
Annex S (informative) Extrapolation of the nominal design stress based on time-independent
behaviour in the creep range
Annex T (normative) Design by experimental methods
Annex U (informative) Guidance on negligibility of additional thermal cycles in fatigue and
ratcheting assessment
Annex V (informative) Consider a buffer for unknown nozzle loads — Opening design for
unknown nozzle loads
Annex Y (informative) History of EN 13445-3
Annex ZA (informative) Relationship between this European Standard and the essenti

This Part of this document specifies requirements for the design of unfired pressure vessels covered by EN 13445-1:2021 and constructed of steels in accordance with EN 13445-2:2021.