EN 13445-3:2021/FprA1

SLOVENSKI STANDARD
SIST EN 13445-3:2014/oprA14:2019
01-september-2019
Neogrevane (nekurjene) tlačne posode - 3. del: Konstruiranje - Dopolnilo A14
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 13445-3:2014/prA14
ICS:
23.020.32 Tlačne posode Pressure vessels
SIST EN 13445-3:2014/oprA14:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 13445-3:2014/oprA14:2019

SIST EN 13445-3:2014/oprA14:2019

DRAFT
EUROPEAN STANDARD
EN 13445-3:2014
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA14
July 2019
ICS 23.020.30
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 draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 54.

This draft amendment A14, if approved, will modify the European Standard EN 13445-3:2014. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.

This draft amendment was established by CEN 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13445-3:2014/prA14:2019 E
worldwide for CEN national Members.

SIST EN 13445-3:2014/oprA14:2019
EN 13445-3:2014/prA14:2019 (E)
Contents Page
European foreword . 3
1 Modification to Clause 9, Openings in shells . 4

SIST EN 13445-3:2014/oprA14:2019
EN 13445-3:2014/prA14:2019 (E)
European foreword
This document (EN 13445-3:2014/prA14:2019) has been prepared by Technical Committee CEN/TC 54
“Unfired pressure vessels”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a standardization request 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(s), see informative Annex ZA, which is an integral part of
EN 13445-3:2014.
SIST EN 13445-3:2014/oprA14:2019
EN 13445-3:2014/prA14:2019 (E)
1 Modification to Clause 9, Openings in shells
Replace the whole Clause 9 with the following one:
"
9 Openings in shells
9.1 Purpose
The design method specified in this clause is applicable to circular, elliptical or obround openings in
dished ends or cylindrical, conical or spherical shells under internal or external pressure.
This clause is applicable to openings, nozzles and reinforcing plates in dished ends which are
completely located inside the central area limited by a radius equal to 0,4D as shown in Figure 9.5-4.
e
For different locations (i.e. nozzles in knuckle regions) the relevant design rules are given in Clause 7.
Design for non-pressure loads is covered by Clause 16.
9.2 Specific definitions
The following definitions apply in addition to those in Clause 3.
9.2.1
ligament check
evaluation of the reinforcement between two adjacent openings
9.2.2
opening
reinforcing ring or a nozzle, through penetration of the shell which may or may not be fitted with a
reinforcing plate
9.2.2.1
obround opening
opening with an obround shape, given by two semicircles connected by two parallel straight lines
9.2.3
overall check
evaluation of the reinforcement in the cross-section including the walls on each side of each opening
and the lengths of adjacent shell
9.2.4
reinforcement
loaded cross-sectional area of metal considered to provide resistance to the pressure at an opening
9.2.5
reinforced opening
opening where the reinforcement includes a contribution from the shell, from a nozzle, a reinforcing
plate or a reinforcing ring
9.2.6
reinforcing plate
plate which is fillet welded to the shell and contributes to the reinforcement
9.2.7
reinforcing ring
set-in ring which contributes to the reinforcement
SIST EN 13445-3:2014/oprA14:2019
EN 13445-3:2014/prA14:2019 (E)
9.2.8
set-in nozzle
nozzle which passes through the shell and is welded to it on the inside and outside of the shell
(see Figure 9.4-8)
9.2.9
set-on nozzle
nozzle which is welded only to the outside of the shell (see Figure 9.4-7)
9.2.10
shell
cylinder, sphere, cone or dished end
9.2.11
shell discontinuity
junction between any two of the following: cylinder, cylinder on a different axis, cone, dished head,
spherical end, flange or flat head
9.2.12
small opening
isolated opening which satisfies the condition of Formula (9.5-18)
9.3 Specific symbols and abbreviations
9.3.1 General
The following symbols, subscripts and abbreviations apply in addition to those in Clause 4.
9.3.2 Subscripts
The following subscripts apply to the symbols listed in 9.3.3.
a refers to the analysis thickness of a component;
b refers to a nozzle or branch;
c refers to the mean value of a dimension;
e refers to the outside or external dimension;
i refers to the inside or internal dimension;
L refers to a ligament check;
O refers to an overall check;
o refers to a possible maximum or minimum value; among different values;
p refers to a reinforcing plate;
r refers to a reinforcing ring;
s refers to the shell;
w refers to the area of fillet weld which may be taken into account for reinforcement;
φ refers to additional pressure loaded area for an oblique nozzle connection;
1 refers to the first of two adjacent openings;
2 refers to the second of two adjacent openings.
SIST EN 13445-3:2014/oprA14:2019
EN 13445-3:2014/prA14:2019 (E)
9.3.3 Symbols
Symbol Description Unit
a Distance taken along the mid-thickness of the shell between the centre mm
of an opening and the external edge of a nozzle or ring; or, if no nozzle
or ring is present, a is the distance between the centre of the hole and its
bore.
a , a Values of a on the ligament side of the opening (Figures 9.6–2 and 9.6– mm
1 2
3).
a’ , a’ Values of a on the opposite side of the opening to the ligament mm
1 2
(see Figure 9.6–5).
Af Stress loaded cross-sectional area effective as reinforcement. mm
Af Af of the shell contained along the length L (see Figures 9.6–1 to 9.6–4). mm
Ls b
Af Af of the shell contained along the length L (see Figures 9.6–5 to 9.6–
Os b1
mm
6).
Af Cross-sectional area of fillet weld between nozzle (or plate) and shell
w
mm
(see 9.5.2.3.3 and Figures 9.4–4 and 9.5–1).
Ap Pressure loaded area. mm
Ap Ap of the shell for the length L (see Figures 9.6–1 to 9.6–4). mm
Ls b
Ap Ap of the shell for the length L (see Figures 9.6–5 to 9.6–6). mm
Os b1
Ap Additional pressure loaded area for oblique nozzle connection, function
φ
mm
of angle φ (see Figures 9.5–1 to 9.5–3).
d Diameter (or maximum width) of an opening on shell without nozzle. mm
d External diameter of a nozzle fitted in a shell. mm
eb
d Internal diameter of a nozzle fitted in a shell. mm
ib
d Internal diameter of a reinforcing plate. mm
ip
d External diameter of a reinforcing ring. mm
er
d Internal diameter of a reinforcing ring. mm
ir
d Internal diameter of extruded opening. mm
ix
D Mean diameter of a cylindrical shell at the junction with another mm
c
component.
De External diameter of a cylindrical or spherical shell, the cylindrical part mm
of a torispherical or an elliptical dished end, a conical shell at the centre
of an opening.
D Internal diameter of a cylindrical or spherical shell, the cylindrical part mm
i
of a torispherical or an elliptical dished end, a conical shell at the centre
of an opening.
e Minimum required thickness of a cylindrical shell at the junction with mm
another component (see Figures 9.7–6 and 9.7–10).
e Minimum required thickness of a conical shell at the junction with a mm
cylindrical shell (see Figures 9.7–6 and 9.7–10).
SIST EN 13445-3:2014/oprA14:2019
EN 13445-3:2014/prA14:2019 (E)
Symbol Description Unit
e Effective thickness of nozzle (or mean thickness within the external mm
b
length l or internal length l ) taken into account for reinforcement
bo bio
calculation.
e Analysis thickness of nozzle (or mean analysis thickness within the mm
a,b
length lb external or internal by the shell).
e Average thickness along the length l for reinforcing rings mm
a,m o
(see Formula (9.5–48)).
e Assumed shell thickness of shell wall (see Formula (9.5–2) for checking mm
c,s
of reinforcement of an opening. The thickness may be assumed by
designer between the minimum required shell thickness e and the shell
analysis thickness e . This assumed thickness shall then be used
a,s
consistently in all requirements.
For e the shell analysis thickness may be used always, but sometimes it
c,s
may be advantageous to use a smaller assumed value to obtain smaller
distances from adjacent shell discontinuities.
e Effective thickness of reinforcing plate taken into account for mm
p
reinforcement calculation.
e Analysis thickness of reinforcing plate. mm
a,p
er Effective thickness of reinforcing ring taken into account for mm
reinforcement calculation.
e Analysis thickness of reinforcing ring. mm
a,r
e Analysis thickness of shell wall or mean analysis thickness within the mm
a,s
length l' and excluding the thickness of the reinforcing pad if fitted.
s
e's Length of penetration of nozzle into shell wall for set-in nozzles with mm
partial penetration.
f Nominal design stress of the nozzle material. MPa
b
f Nominal design stress of the reinforcing plate material. MPa
p
f Nominal design stress of shell material. MPa
s
h Inside height of a dished end, excluding cylindrical skirt. mm
k Reduction factor for l (used for overall check in 9.6.4). _
so
l Length of nozzle extending outside the shell. mm
b
l' Effective length of nozzle outside the shell for reinforcement. mm
b
l Length of nozzle extending inside the shell (i.e.: protruding nozzle). mm
bi
l’ Effective length of nozzle inside the shell for reinforcement. mm
bi
l Maximum length of nozzle outside the shell for reinforcement. mm
bo
SIST EN 13445-3:2014/oprA14:2019
EN 13445-3:2014/prA14:2019 (E)
Symbol Description Unit
l Length of cylindrical shell given by Formula (9.7–3) and used in the mm
cyl
strength assessment of a junction (see Figure 9.7–6) between a cylinder
and:
— the small end of a conical shell with same axis;
— a spherical shell convex towards the cylinder;
— a cylindrical shell with convergent axis.
l Length of conical shell given by Formula (9.7–7) and used in the mm
con
strength assessment of a junction between the small end of a cone and a
cylindrical shell, (see Figure 9.7–6).
l Distance between the centre line of a shell butt-weld and the centre of mm
n
an opening near or crossing the butt-weld.
l Maximum length of ring and shell wall in reinforcing rings for mm
o
reinforcement.
l Width of reinforcing plate. mm
p
l Width of reinforcing plate between two adjacent openings (Figure 9.6– mm
pi
5).
l’ Effective width of reinforcing plate for reinforcement. mm
p
l Width of reinforcing ring. mm
r
l’r Effective width of reinforcing ring for reinforcement. mm
l Length of shell, from the edge of an opening or from the external mm
s
diameter of a nozzle, to a shell discontinuity.
l’ Effective length of shell for opening reinforcement. mm
s
l Maximum length of shell contributing to opening reinforcement, taken mm
so
on the mean surface of the shell wall.
L Centre-to-centre distance between two openings or nozzles taken on the mm
b
mean surface of the shell (see Figure 9.6–2).
L Length of cross sectional area of shell including the whole section of two mm
b1
adjacent openings taken on the surface of the shell.
r Inside radius of curvature of the shell at the opening centre. mm
is
R Inside radius of a hemispherical end or of the crown of a torispherical mm
end.
w Distance between an opening and a shell discontinuity (see Figures 9.7– mm
1 to 9.7–11).
w Required minimum value for w. mm
min
w Minimum value for w which has no influence on l from shell mm
p s
discontinuities.
α Half apex angle of a conical shell. degrees
SIST EN 13445-3:2014/oprA14:2019
EN 13445-3:2014/prA14:2019 (E)
Symbol Description Unit
θ For a nozzle having a longitudinal weld, angle between the plane degrees
containing the nozzle axis and the longitudinal weld line, and the plane
containing the nozzle axis and the shell generatrix passing through the
centre of the opening.
φ Obliquity angle in the longitudinal or transversal cross-section, degrees
measured between the normal to the wall at the opening centre and the
projection of the nozzle axis on th
...