SIST EN 13445-3:2002/A16:2009

Unfired pressure vessels - Part 3: Design

Amendment to Clause 21 (Stiffened flat walls)

Unbefeuerte Druckbehälter - Teil 3: Konstruktion

Récipients non soumis a la flamme - Partie 3: Conception

Neogrevane tlačne posode - 3. del: Konstruiranje

General Information

• Status: Withdrawn
• Publication Date: 22-Feb-2009
• Withdrawal Date: 19-Jan-2010
• ICS: 23.020.32 - Pressure vessels
• Technical Committee: TLP - Pressure vessels
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 30-Dec-2009
• Due Date: 22-Jan-2010
• Completion Date: 20-Jan-2010
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: EN 13445-3:2002/A16:2008 - Unfired pressure vessels - Part 3: Design

Relations

• Amends: SIST EN 13445-3:2002 - Unfired pressure vessels - Part 3: Design
• Effective Date: 01-Apr-2009
• Replaced By: SIST EN 13445-3:2009 - Unfired pressure vessels - Part 3: Design
• Effective Date: 01-Feb-2010
• Amends: SIST EN 13445-3:2002 - Unfired pressure vessels - Part 3: Design
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 13445-3:2002/A16:2009
01-april-2009
1HRJUHYDQHWODþQHSRVRGHGHO.RQVWUXLUDQMH
Unfired pressure vessels - Part 3: Design
Unbefeuerte Druckbehälter - Teil 3: Konstruktion
Récipients non soumis a la flamme - Partie 3: Conception
Ta slovenski standard je istoveten z: EN 13445-3:2002/A16:2008
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
SIST EN 13445-3:2002/A16:2009 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13445-3:2002/A16:2009

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SIST EN 13445-3:2002/A16:2009
EUROPEAN STANDARD
EN 13445-3:2002/A16
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2008
ICS 23.020.30

English Version
Unfired pressure vessels - Part 3: Design
Récipients sous pression non soumis à la flamme - Partie Unbefeuerte Druckbehälter - Teil 3: Konstruktion
3: Conception
This amendment A16 modifies the European Standard EN 13445-3:2002; it was approved by CEN on 25 September 2008.
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. Up-to-date lists and bibliographical references concerning such
national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This amendment 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, 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 United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13445-3:2002/A16:2008: E
worldwide for CEN national Members.

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SIST EN 13445-3:2002/A16:2009
EN 13445-3:2002/A16:2008 (E)
Contents Page
Foreword .3
22 Circular flat ends with radial reinforcement ribs .4
22.1 Purpose .4
22.2 Specific definitions .4
22.3 Specific symbols and abbreviations .6
22.4 Ends without additional peripheral bending moment.7
22.4.1 Maximum allowable pressure .7
22.4.2 Minimum Dimensions .8
22.5 Ends with additional peripheral bending moment .9
22.6 Openings . 11
22.7 Welds . 12
22.8 Central Ring . 13
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of the EU Directive 97/23/EC on Pressure Equipment . 14

2

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SIST EN 13445-3:2002/A16:2009
EN 13445-3:2002/A16:2008 (E)
Foreword
This document (EN 13445-3:2002/A16:2008) has been prepared by Technical Committee CEN/TC 54
“Unfired pressure vessels”, the secretariat of which is held by BSI.
This Amendment to the European Standard EN 13445-3:2002 shall be given the status of a national standard,
either by publication of an identical text or by endorsement, at the latest by June 2009, and conflicting national
standards shall be withdrawn at the latest by June 2009.
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 has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directive(s).
For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document.
This document includes the text of the amendment itself. The corrected pages of EN 13445-3 will be delivered
as issue 34 of the standard.
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, Cyprus, 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.
3

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SIST EN 13445-3:2002/A16:2009
EN 13445-3:2002/A16:2008 (E)

Add the following new clause:
22 Circular flat ends with radial reinforcement ribs
22.1 Purpose
The purpose of the rules in this Clause is to allow the design of circular flat ends reinforced by radial ribs, with
or without uniformly distributed peripheral bending moment, subject to pressure.
The components considered in this Clause consist of a circular flat end, reinforced by radial uniformly spaced
ribs; the height of the ribs is generally constant, however their profile may be slightly inclined at the outer edge
(see Figures 22.2-1, 22.2-2, 22.2-3 and 22.2-4).
The ribs shall be connected with each other at the centre of the end; this may be obtained either by welding
them together, or by welding them to a central ring or to a rigid plug. The number of the ribs should be neither
smaller than 3 nor greater than 24.
These rules do not deal with the calculation for leak tightness of the connection between the end and the
corresponding flange on the vessel; in case the leak tightness has to be assured, the required thickness of the
end might be greater than the thickness required by the static calculation, at least in the area of the gasket
and relevant bolting.
This kind of construction is not recommended in case of cyclic loadings or in case of external corrosion.
22.2 Specific definitions
The following definitions are in addition to those in Clause 3.
22.2.1
reinforcing rib
rectangular plate located along the radius of a circular flat end, located perpendicularly to its plane and welded
to it from both sides
22.2.2
continuous weld
weld between the rib and the end, located on both sides of the rib, for its entire length
22.2.3
intermittent weld
weld between the rib and the end, located on both sides of the rib, composed by different segments
interesting only a portion of its length.
4

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SIST EN 13445-3:2002/A16:2009
EN 13445-3:2002/A16:2008 (E)
d
1 d
I 1 I
d d
2 2
d
d 4
4

(a)                                               (b)
Figure 22.2-1 Welded ends with ribs

d d
I
1 1
d
2
d
2
d
3
d d
=
4 2
d
4
Figure 22.2-2 Welded end with ribs (Ribs Figure 22.2-3 Bolted end with ribs and additional
welded to a protruding shell)        peripheral bending moment



5
h
h
e
e
h
h
e
e

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A
A
SIST EN 13445-3:2002/A16:2009
EN 13445-3:2002/A16:2008 (E)
d
1
d
2
d
4
d
l
1

(section AA) (view from Top)

               Figure 22.2-4 Bolted end with ribs without additional peripheral bending moment

22.3 Specific symbols and abbreviations
The following symbols and abbreviations are in addition to those in clause 4.
d    diameter of central plug or ring
1
d    diameter subject to pressure
2
d    diameter of bolt circle
3
d    outside diameter of end
4
e    thickness of end
e    thickness of reinforcing ribs
R
e     thickness of central circular ring
C
f     nominal design stress of end at design temper
...