EN 13480-3:2002/A1:2005
(Amendment)Metallic industrial piping - Part 3: Design and calculation
Metallic industrial piping - Part 3: Design and calculation
Calculation method for large opening
Industrielle metallische Rohrleitungen - Teil 3: Konstruktion und Berechnung
Tuyauteries industrielles métalliques - Partie 3: Conception et calcul
La présente annexe spécifie une méthode de vérification des raccordements de tubulures soumis à une pression intérieure et à des moments (Figure O.1). Lorsque des charges extérieures ne peuvent pas être négligées, cette méthode peut être utilisée à la place de la méthode décrite dans l'EN 13480-3:2002, 8.1. Les règles de cette annexe doivent s'appliquer à des températures inférieures à celles du domaine du fluage et aux raccordements de tubulures suivants :
- raccordement de cylindres à axes concourants ;
- rapport du diamètre du tuyau de la tubulure et du diamètre du tuyau sans tracé préalable dans un intervalle situé entre 0,1 et 1, les valeurs 0,1 et 1 étant inclus ;
- rapport de l'épaisseur du tuyau de la tubulure et de l'épaisseur du tuyau sans tracé préalable dans un intervalle situé entre 0,2 et 1,5, les valeurs 0,2 et 1,5 étant inclus ;
- rapport du diamètre moyen du tuyau sans tracé préalable et de l'épaisseur du tuyau sans tracé préalable dans un intervalle situé entre 10 et 125, les valeurs 10 et 125 étant inclus ;
- tuyau de tubulure auto-renforcé ou comportant une plaque d'encerclement total (largeur = dm / 2) ;
- angle fb entre l'axe du tuyau de la tubulure et l'axe du tuyau sans tracé préalable compris entre 45° et 90°, les valeurs 45° et 90° étant inclus ;
- épaisseur maximale de la selle de renfort = 1,5 fois l'épaisseur nominale.
NOTE Les développements actuels inclus dans cette annexe ne traitent pas des tés forgés étant donné la réduction éventuelle d'épaisseur qui pourrait survenir à l'emplacement de la tubulure ( par exemple : tés étirés à chaud).
Kovinski industrijski cevovodi – 3. del: Konstruiranje in izračun
Ta del standarda EN 13480 opisuje zahteve za konstruiranje in izračun industrijskih kovinskih cevnih sistemov, vključno s podporami.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2005
.RYLQVNLLQGXVWULMVNLFHYRYRGL±GHO .RQVWUXLUDQMHLQL]UDþXQ
Metallic industrial piping - Part 3: Design and calculation
Industrielle metallische Rohrleitungen - Teil 3: Konstruktion und Berechnung
Tuyauteries industrielles métalliques - Partie 3: Conception et calcul
Ta slovenski standard je istoveten z: EN 13480-3:2002/A1:2005
ICS:
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 13480-3:2002/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2005
ICS 23.040.01
English Version
Metallic industrial piping - Part 3: Design and calculation
Tuyauteries industrielles métalliques - Partie 3: Conception Industrielle metallische Rohrleitungen - Teil 3: Konstruktion
und Berechnung
This amendment A1 modifies the European Standard EN 13480-3:2002; it was approved by CEN on 20 July 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13480-3:2002/A1:2005: E
worldwide for CEN national Members.
Contents Page
Foreword .3
8 Openings and branch connections .4
8.1 General.4
Annex O (normative) Alternative method for checking branch connections .5
O.1 Scope.5
O.2 Symbols.5
O.3 Design and checking of the branch connection.7
O.3.1 Limit value for the load due to pressure only for straight pipes without opening.7
O.3.2 Determination of the minimum thicknesses under loading due to pressure only.7
O.3.3 Checking of the thicknesses selected for the combination of pressure loading and
loadings due to external loads.8
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 97/23/EC. .59
Bibliography.60
Foreword
This European Standard (EN 13480-3:2002/A1:2005) has been prepared by Technical Committee
CEN/TC 267 “Industrial piping and pipelines”, the secretariat of which is held by AFNOR.
This Amendment to the European Standard EN 13480-3:2002 shall be given the status of a national standard,
either by publication of an identical text or by endorsement, at the latest by February 2006, and conflicting
national standards shall be withdrawn at the latest by February 2006.
This European Standard has been prepared under a mandate 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 this European
Standard.
This European Standard contains changes in 8.1 of EN 13480-3:2002, the Annex O (normative) to be added
in EN 13480-3:2002, and the Annex ZA updated to replace the current Annex ZA in EN 13480-3:2002.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
8 Openings and branch connections
8.1 General
Replace 8.1 by:
This subclause shall apply to cylindrical shells, conical shells, spherical shells and dished ends having circular,
elliptical or obround openings, provided that the assumptions and conditions specified in Clause 8 are
satisfied.
For the purposes of Clause 8, the word “shell” shall apply to run pipes and headers in addition to shells.
NOTE 1 Forces and/or moments due to loadings other than internal pressure are not considered in this design method.
NOTE 2 Another route for design openings based on the area replacement method is also given, with its required
safety margins, in ASME B 31.3.
An alternative method for the calculation of openings is given in Annex O (normative).
This new procedure is based on limit analysis and shakedown analysis and allows the connection to be
designed as well as the reinforcement where necessary, and is particularly suitable for large openings.
As for clauses 6, 7, 8, 9 and 11, the requirements of Annex O shall apply for loads of predominantly non-cyclic
nature.
This method applies to connections that are self reinforced and also to those where reinforcing pads are used.
Oblique branch connections are also covered.
In addition, significant moments due to loadings other than internal pressure , as bending or torsion moments,
can be considered by this new design method.
Annex O
(normative)
Alternative method for checking branch connections
O.1 Scope
This annex specifies a method for checking branch connections subjected to internal pressure and to
moments (Figure O.1). Where external loads cannot be neglected, this method may be used in place of the
method of EN 13480-3:2002, 8.1. The rules of this annex shall apply for temperatures below the creep range
and for the following branch connections:
connection of cylinders with intersecting axes;
ratio of branch pipe to run pipe diameter within the range 0,1 to 1, 0,1 and 1 included;
ratio of branch pipe to run pipe thickness within the range 0,2 to 1.5, 0,2 and 1,5 included;
ratio of run pipe mean diameter to run pipe thickness within the range 10 to 125, 10 and 125 included;
branch pipe self-reinforced or with complete encirclement pad (width = d / 2);
m
angle ϕ between branch pipe and run pipe axes within the range 45° to 90°, 45° and 90° included;
b
maximum thickness of reinforcing saddle = 1,5 times nominal thickness.
NOTE The current developments included in this annex do not deal with forged tees, considering the eventual
reduction of thickness that could occur at the branch location (e.g. hot drawn tees).
O.2 Symbols
For the purposes of Annex O, the symbols given below shall apply in addition to those given in Table 8.2-1
and in Table 3.2-1.
D Mean diameter of the run pipe
m
d Mean diameter of the branch pipe
m
e Analysis thickness of the run pipe
s
e Analysis thickness of the branch pipe
b
φ Angle between the branch pipe axis and the run pipe axis (φ = 90° – φ)
b b
p Internal pressure
c
pln Limit pressure for the run pipe, in the absence of branch pipe
s
pln Limit pressure for the branch pipe considered separately
b
p Maximum permitted internal pressure when applied alone
max
Mfp Total bending moment acting on the run pipe and causing a rotation in the plane containing the
s
run pipe and the branch pipe
Mfp Total bending moment acting on the branch pipe and causing a rotation in the plane containing
b
the run pipe and the branch pipe
Mfh total bending moment acting on the run pipe and causing a rotation out of the plane containing
s
the run pipe and the branch pipe
Mfh total bending moment acting on the branch pipe and causing a rotation out of the plane containing
b
the run pipe and the branch pipe
Mt Torsional moment acting on the run pipe
s
Mt Torsional moment acting on the branch pipe
b
Mfln Limit bending moment for the run pipe in the absence of branch pipe. This load is the nominal
s
limit bending load corresponding to Mfp and Mfh
s s
Mtln Limit torsion moment for the run pipe in the absence of branch pipe
s
Mfln Limit bending moment for the branch pipe considered separately. This load is the limit nominal
b
bending load corresponding to Mfp and Mfh
s s
Mtln Limit torsional moment for the branch pipe considered separately
b
Mflp Limit moment for the run pipe fitted with a branch pipe, corresponding to the loading Mfp
s s
Mflh Limit moment for the run pipe fitted with a branch pipe, corresponding to the loading Mfh
s s
Mflp Limit moment for the branch line in the branch connection, corresponding to the loading Mfp
b b
Mflh Limit moment for the branch line in the branch connection, corresponding to the loading Mfh
b b
Mtl Limit moment for the run pipe fitted with a branch pipe, corresponding to the loading Mt
s s
Mtl Limit moment for the branch line in the branch connection, corresponding to the loading Mt
b b
Mfh
b,max
Mfp
b,max
Mt
b,max
Maximum allowable value for each of the external loads when each load is applied
Mfh
alone
s,max
Mfp
s,max
Mt
s,max
Figure O.1-1 – Location of moments
O.3 Design and checking of the branch connection
O.3.1 Limit value for the load due to pressure only for straight pipes without opening
2 D + e
m s
(O.3.1-1)
pln = R ln
s p 0,2 t
D − e
m s
2 d + e
m b
(O.3.1-2)
pln = R ln
b p 0,2 t
d − e
m b
O.3.2 Determination of the minimum thicknesses under loading due to pressure only
a) Weakening coefficient for the loading due to pressure only.
The Graphs O.3.2-1 to O.3.2-6 and Table O.3.2-1 make it possible to determine the weakening coefficient c
as a function of e / e , d / D and d / e .
b s m m m s
b) Minimum thicknesses of the run pipe and branch line.
The minimum thicknesses of the run pipe and of the branch line shall be determined from the following
equations:
−
p D
c i 2
e = (sin ϕ ) (O.3.2-1)
s b
c 2 f z − p
c
3
−
p D
c m 2
e = (sin ϕ ) (O.3.2-2)
s b
c 2 f z
3
−
p D
c e 2
e = (sin ϕ ) (O.3.2-3)
s b
c 2 f z + p
c
3
−
p d
c i
2
e = (sin ϕ ) (O.3.2-4)
b b
c 2 f z − p
c
3
−
p d
c m 2
e = (sin ϕ ) (O.3.2-5)
b b
c 2 f z + p
c
3
−
1 p d
c e 2
e = (sin ϕ ) (O.3.2-6)
b b
c 2 f z + p
c
O.3.3 Checking of the thicknesses selected for the combination of pressure loading and
loadings due to external loads
a) Limit values for the various external loadings applied separately.
For the various external loads applied separately, the limit values are given by the following formulae:
()D + e 2 e
m s s
Mfln = R 1 −1 − (O.3.3-1)
s p 0,2 t
6 D + e
m s
()d + e 2 e
m b b
Mfln = R 1 −1 − (O.3.3-2)
b p 0,2 t
6 d + e
m b
2 π D
m
Mtln = R e (O.3.3-3)
s p 0,2 t s
π d
m
(O.3.3-4)
Mtln = R e
b p 0,2 t b
b) Weakening coefficients for the various external loads applied separately.
The Graphs O.3.2-7 to O.3.2-42 and Table O.3.2-2 make it possible to determine the weakening coefficients
as a function of e / e , d / D and d / e .
b s m m m s
Mflh
b
cfh = (O.3.3-5)
b
Mfln
b
Mflp
b
cfp = (O.3.3-6)
b
Mfln
b
Mtl
b
ct = (O.3.3-7)
b
Mtln
b
Mflh
s
cfh = (O.3.3-8)
s
Mfln
s
Mflp
s
cfp = (O.3.3-9)
s
Mfln
s
Mtl
s
ct = (O.3.3-10)
s
Mtln
s
c) Maximum allowable loads if they are applied separately.
Mfh = 0,5 Mflh (O.3.3-11)
b,max b
Mfp = 0,5 Mflp (O.3.3-12)
b,max b
Mt = 0,5 Mtl (O.3.3-13)
b,max b
Mfh = 0,5 Mflh (O.3.3-14)
s,max s
Mfp = 0,5 Mflp (O.3.3-15)
s,max s
Mt = 0,5 Mtl (O.3.3-16)
s,max s
(O.3.3-17)
p = MIN[z MIN()pln ; pln ; c MIN(pln ; pln)(sin ϕ ) ]
max s b s b b
d) Checking of the admissibility of the applied loads.
Mfh
b
≤ 1 (O.3.3-18)
Mfh
b,max
Mfp
b
≤ 1 (O.3.3-19)
Mfp
b,max
Mt
b
≤ 1 (O.3.3-20)
Mt
b,max
Mfh
s
≤ 1 (O.3.3-21)
Mfh
s,max
Mfp
s
≤ 1 (O.3.3-22)
Mfp
s,max
Mt
s
≤ 1 (O.3.3-23)
Mt
s,max
p
c
≤ 1 (O.3.3-24)
p
max
2 2 2 2 2 2
Mfh Mfp Mt Mfh Mfp Mt p
b b b s s s c
...
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