SIST EN 13480-3:2018/A5:2023

Metallic industrial piping - Part 3: Design and calculation

This Part of this European Standard specifies the design and calculation of industrial metallic piping systems, including supports, covered by EN 13480

Metallische industrielle Rohrleitungen - Teil 3: Konstruktion und Berechnung

Tuyauteries industrielles métalliques - Partie 3: Conception et calcul

Kovinski industrijski cevovodi - 3. del: Konstruiranje in izračun - Dopolnilo A5

General Information

• Status: Withdrawn
• Public Enquiry End Date: 01-Oct-2021
• Publication Date: 17-Oct-2023
• Withdrawal Date: 07-Nov-2024
• ICS: 23.040.01 - Pipeline components and pipelines in general
• ICS: 23.040.10 - Iron and steel pipes
• ICS: 77.140.75 - Steel pipes and tubes for specific use
• Technical Committee: TLP - Pressure vessels
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 03-Oct-2024
• Due Date: 26-Oct-2024
• Completion Date: 08-Nov-2024
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Directive: EUR-PUB - European Union - Public Standards
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: EN 13480-3:2017/A5:2022 - Metallic industrial piping - Part 3: Design and calculation

Relations

• Replaced By: SIST EN 13480-3:2024 - Metallic industrial piping - Part 3: Design and calculation
• Effective Date: 01-Dec-2024
• Amends: SIST EN 13480-3:2018 - Metallic industrial piping - Part 3: Design and calculation
• Effective Date: 01-Nov-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2023
Kovinski industrijski cevovodi - 3. del: Konstruiranje in izračun - Dopolnilo A5
Metallic industrial piping - Part 3: Design and calculation
Metallische industrielle Rohrleitungen - Teil 3: Konstruktion und Berechnung
Tuyauteries industrielles métalliques - Partie 3: Conception et calcul
Ta slovenski standard je istoveten z: EN 13480-3:2017/A5:2022
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
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.

EN 13480-3:2017/A5
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2022
EUROPÄISCHE NORM
ICS 23.040.01
English Version
Metallic industrial piping - Part 3: Design and calculation
Tuyauteries industrielles métalliques - Partie 3: Metallische industrielle Rohrleitungen - Teil 3:
Conception et calcul Konstruktion und Berechnung
This amendment A5 modifies the European Standard 2429052; it was approved by CEN on 28 November 2022.

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-CENELEC 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-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, Türkiye 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13480-3:2017/A5:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modification to Clause 2, “Normative references” . 4
2 Modification to 3.2, “Symbols and units” . 4
3 Modification to 4.5, “Joint coefficient” . 6
4 Modification to 6.1, “Straight pipes” . 6
5 Modification to 6.4.2, “Specific definitions” . 6
6 Modification to 6.4.6.2, “Design” . 6
7 Modification to 6.4.7.2, “Design” . 7
8 Modification to 6.4.9, “Offset reducers” . 7
9 Modification to 8.3.2, “Openings in the vicinity of discontinuities” . 7
10 Modification to 8.4.3, “Reinforced openings with d /D < 0,8” . 8
i i
11 Modification to 9.1, “General” . 9
12 Modification to 9.2.1, “Symbols” .11
13 Modification to 9.2.2, “Elastic stress limits” .12
14 Modification to 9.3.2, “Interstiffener collapse” .13
15 Modification to 9.3.3, “Overall collapse of stiffened pipes” .14
16 Modification to 11.2, “Allowable stresses” .14
17 Modification to 11.6, “Stress analysis of the run pipe” .15
18 Modification to 13.11.2, “Design temperatures for support components” .17
19 Modification to 13.11.4, “Determination of component sizes” .18
20 Modification to 13.11.5, “Welded connections” .19
21 Modification to 13.11.6, “Threaded connections” .21

European foreword
This document (EN 13480-3:2017/A5:2022) has been prepared by Technical Committee CEN/TC 267
“Industrial piping and pipelines”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2023 and conflicting national standards shall be
withdrawn at the latest by June 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
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) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of EN 13480-3:2017.
This document includes the text of the amendment itself. The amended/corrected pages of
EN 13480-3:2017 will be published in the new edition of the European Standard.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, 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, Türkiye and the United
Kingdom.
1 Modification to Clause 2, “Normative references”
Add the following normative reference:
“EN 1993-1-8:2005, Eurocode 3: Design of steel structures — Part 1-8: Design of joints”.
2 Modification to 3.2, “Symbols and units”
Table 3.2-1 shall read as follows:
“Table 3.2–1 — General symbols and units
Symbol Description Unit
A elongation at rupture %
E modulus of elasticity MPa
(N/mm )
P maximum pressure obtained from the design by formulae or relevant MPa
max
procedures for a given component (N/mm )
a
PS maximum allowable pressure bar
b
R, r radii mm
R minimum specified value of upper yield strength at room temperature MPa
eH
(N/mm )
c
R minimum specified value of upper yield strength at calculation temperature t MPa
eH t
(N/mm )
R minimum specified value of tensile strength at room temperature MPa
m
(N/mm )
c
R minimum specified value of tensile strength at calculation temperature t MPa
m t
(N/mm )
R minimum specified value of 0,2 % proof strength at room temperature MPa
p0,2
(N/mm )
c
R minimum specified value of 0,2 % proof strength at calculation temperature t MPa
p0,2 t
(N/mm )
R minimum specified value of 1,0 % proof strength at room temperature MPa
p1,0
(N/mm )
c
R minimum specified value of 1,0 % proof strength at calculation temperature t MPa
p1,0 t
(N/mm )
S mean value of the stress which leads to a 1 % creep elongation in 100 000 h MPa
(N/mm )
S mean value of the stress which leads to a 1 % creep elongation in 200 000 h MPa
(N/mm )
S Mean value of creep rupture strength according to the material standards, for MPa
R T t
material temperature t, and lifetime T (in hours) under consideration whereby (N/mm )
the scatter band does not deviate by more than ± 20 % from the mean value.
T time h
t temperature °C
Symbol Description Unit
TS maximum allowable temperature °C
Z section modulus for a pipe mm
c corrosion or erosion allowance (see Figure 4.3–1) mm
c absolute value of the negative tolerance taken from the material standard mm
(see Figure 4.3–1)
c thinning allowance for possible thinning during manufacturing process mm
(see Figure 4.3–1)
e analysis thickness of a component used for the check of the strength mm
a
(see Figure 4.3–1)
e nominal thickness on drawings (see Figure 4.3–1) mm
n
e ordered thickness (see Figure 4.3–1) mm
ord
e minimum required thickness with allowances and tolerances (see mm
r
Figure 4.3–1)
f design stress (see Clause 5) MPa
(N/mm )
f Design stress in the creep range MPa
cr
(N/mm )
Design stress for flexibility analysis MPa
f
f
(N/mm )
p calculation pressure (see 4.2.3.4) MPa
c
(N/mm )
p operating pressure (see 4.2.3.1) MPa
o
(N/mm )
t calculation temperature (see 4.2.3.5) °C
c
t operating temperature (see 4.2.3.2) °C
o
z joint coefficient (see 4.5) -
ε additional thickness resulting from the selection of the ordered thickness (see mm
Figure 4.3–1)
a 2
All pressures for calculation purposes are in MPa (N/mm ) and PS is in bar.
b
The following subscripts apply:
i inside
m mean
o outside
c
When t is greater than the room temperature.
”.
3 Modification to 4.5, “Joint coefficient”
At the end of 4.5, the NOTE shall read as follows:
NOTE See EN 13480-5:2017, Table 8.3-1. Where the standard defining the technical conditions of delivery of a
welded product gives the appropriate requirements concerning destructive and non-destructive tests (e.g.
EN 10217 series), the joint coefficient for the wall thickness calculation can be taken equal to z = 1,0.
4 Modification to 6.1, “Straight pipes”
In 6.1, Formulae (6).1-1) and (6.1-2) shall read as follows:
“
— where D /D ≤ 1,7:
o i
pD
co
(6.1-1)
e=
2 fz+ p
c
or
pD
ci
(6.1-2)
e=
2 fz− p
c
”.
5 Modification to 6.4.2, “Specific definitions”
Figure 6.4.2-2 shall be modified as follows:
“
Figure 6.4.2-2 — Geometry of cone/cylinder intersection with knuckle – Large end”.
6 Modification to 6.4.6.2, “Design”
The 5th paragraph of 6.4.6.2 shall read as follows:
“The required thickness e of the cone adjacent to the junction is the greater of e and e . This thickness
2 con
j
shall be maintained for a distance of at least 1,4l from the junction along the cone, see Figure 6.4.2-1.”.
7 Modification to 6.4.7.2, “Design”
The 6th paragraph of 6.4.7.2 shall read as follows:
“The required thickness e of the knuckle and the cone adjacent to the junction is the greater of e and
2 con
e . This thickness shall be maintained for a distance of at least 1,4l from the junction and 0,7l from the
j 2 2
cone/knuckle tangent line along the cone, see Figure 6.4.2-2.”.
8 Modification to 6.4.9, “Offset reducers”
The 5th sentence of 6.4.9 shall read as follows:
“The greater of these shall apply to the cone section of the reducer.”.
9 Modification to 8.3.2, “Openings in the vicinity of discontinuities”
Indent b) of 8.3.2 shall read as follows:
“
b) Openings in conical shells connected to cylindrical shells shall have the distances x and x shown in
L S
Figure 8.3.2-2 as follows:
— for the large end

De
mL as
x ≥ max 0,2 ; 3,0 e (8.3.2-3)

L as

cosα

— for the small end
 
D e
mS as
x ≥ max ; 3,0 e (8.3.2-4)
 
S as
 
cosα
 
where
D is the mean diameter of cylindrical shell at the large end;

mL
D is the mean diameter of cylindrical shell at the small end.

mS
”.
Figure 8.3.2-2 — Opening in a conical shell
10 Modification to 8.4.3, “Reinforced openings with d /D < 0,8”
i i
After Formula (8).4.3-2), the following sentence shall be added:
“d is the equivalent diameter of the branch at the intersection calculated according to
eqb
Formulae (8).4.1-3) and (8.4.1-4) using the dimensions of the branch instead of the shell.”.
Indent c), 2nd paragraph of subclause 8.4.3, Formula (8).4.3-8) shall be deleted, new Figure 8.4.3-3 shall be
inserted, and the paragraph shall read as follows:
“Formulae (8).4.3-3) or (8.4.3-6) and (8.4.3-7) shall apply.
The maximum length of the shell considered as contributing to reinforcement shall be evaluated in
accordance with the Formula (8).4.1-2) and for the branches in accordance with Formulae (8).4.3-1) and
(8.4.3-2).
Figure 8.4.3-3 — Reinforcement of oblique branch connection in cylindrical or conical shell”.
nd rd
Indent d), 2 and 3 paragraph of subclause 8.4.3 shall read as follows:
“The reinforcement shall be calculated in accordance with Formulae (8).4.3-3), (8.4.3-6) and (8.4.3-7).
The maximum length of the shell considered as contributing to reinforcement shall be evaluated in
accordance with the Formula (8).4.1-2) and for the branches in accordance with Formulae (8).4.3-1) and
(8.4.3-2).”.
11 Modification to 9.1, “General”
9.1 shall read as follows:
“9.1 General
The rules in Clause 9 shall take account of loading due to external pressure.
9.1.1 External calculation pressure
The external pressure to be taken into account for calculation purpose shall be the maximum external
pressure under operating conditions, or test conditions whichever is the greater.
Where internal pressure may decrease below atmospheric pressure due to fluid cooling, the external
pressure to be used in calculation shall be equal to:
— 1 bar for single piping subject to external pressure; or
— the pressure between the two jackets, plus 1 bar for jacketed piping.
If pressure relief devices are fitted and where internal pressure may decrease below atmospheric
pressure due to fluid cooling, the external pressure to be used in the calculation shall be at least the set
pressure of the device.
9.1.2 Exception from verification against external pressure
For piping operating with external pressure not exceeding 1 bar, a check of design adequacy shall not be
required where the following requirements are met:
— piping made of carbon steels or low alloy steels at a temperature less than or equal to 150 °C, or made
of austenitic steel at a temperature less than or equal to 50 °C; and
— where e/D ≥ 0,01; and
o
— where out-of-roundness, u (see EN 13480-4:2017, 7.4.1), is less than or equal to 1 %, and local flat
deviation is less than or equal to e.
9.1.3 General acceptance criteria
The thickness of a component under external pressure shall be not less than the thickness required by
this standard for similar components under the same internal pressure using a joint coefficient of 1, (i.e.
without any joint coefficient) or the thickness required by Clause 9 whichever is the greater.
There are two additional acceptability criteria which need to be checked for pipes / pressure vessels
subjected to external pressure:
a) Sufficient safety margin against linear buckling: The existing external pressure p shall be smaller
than the theoretical limit of stability of the perfect shape of the piping p divided by a safety factor of
m
k = 3.0.
m
pp≤ / k (9.1.3-1)
mm
The pressure p may be calculated using the formulas given below for the piping elements or by
m
linear buckling analysis (bifurcation load).
b) Sufficient safety against over-stresses due to imperfections (e.g. ovalization). The existing external
pressure p shall be smaller than pressure p at which the mean circumferential stress in the shell
yo
reaches yield point of material divided by a safety factor of k = 1.5.
y
pp≤ / k  (9.1.3-2)
yo y
The pressure p shall be calculated taking into account the initial out of roundness of the piping as
yo
well as the increase of the imperfections due to the external pressure. The calculation can be done
using the provisions of this chapter or using a detailed (e.g FE) analysis including the effects of
geometric distortion under pressure (geometric nonlinearity / large deformation) and the material
nonlinearities in case of piping subject to external pressure in the creep range.
The allowable deviation from the design shape shall be specified on the drawing or in associated
documents.
The joint coefficient of welds shall not be taken into account.
Stiffening rings and other features used as stiffeners shall extend and be completely attached around
the circumference. Any joint shall be so designed as to develop the full stiffness of the ring. Where
internal stiffening rings arranged with local spaces between the shell and the ring are used (see
Figure 9.1-1), in no case shall the length of the unsupported shell plate exceed the piping
circumference divided by the coefficient (4 n ).
cyl
Intermittent welds shall not be used where crevice corrosion can occur.

Figure 9.1-1 — Internal stiffening rings with a reinforced cut-out”.
12 Modification to 9.2.1, “Symbols”
Table 9.2.1-1 shall be completed with three additional lines after the line R as follows:
s
“
minimum specified value of 1,0 % proof strength at calculation temperature t MPa (N/mm )
R
p1,0 st
of stiffener
mean value of the stress which leads to a 1 % creep elongation for the material MPa (N/mm )

R
p1,0 Tt
of the pip
...