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
Published
Publication Date
20-Dec-2022
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
21-Dec-2022
Due Date
23-Aug-2022
Completion Date
21-Dec-2022

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SLOVENSKI STANDARD
SIST EN 13480-3:2018/oprA5:2021
01-september-2021
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/prA5:2021
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
SIST EN 13480-3:2018/oprA5:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13480-3:2018/oprA5:2021

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SIST EN 13480-3:2018/oprA5:2021


DRAFT
EUROPEAN STANDARD
EN 13480-3:2017
NORME EUROPÉENNE

EUROPÄISCHE NORM
prA5
August 2021
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 draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 267.

This draft amendment A5, if approved, will modify the European Standard EN 13480-3:2017. 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, 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, 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13480-3:2017/prA5:2021:2021 E
worldwide for CEN national Members.

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
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 6.4.6.2, Design . 6
6 Modification to 6.4.7.2, Design . 6
7 Modification to 6.4.9, Offset reducers . 6
8 Modification to 8.3.2, Openings in the vicinity of discontinuities . 6
9 Modification to 8.4.3, Reinforced openings with d /D < 0,8 . 7
i i
10 Modification to 9.1, General . 8
11 Modification to 9.2.1, Symbols .10
12 Modification to 9.2.2, Elastic stress limits .10
13 Modification to 9.3.2, Interstiffener collapse .11
14 Modification to 9.3.3, Overall collapse of stiffened pipes .12
15 Modification to 11.2, Allowable stresses .12
16 Modification to 11.6, Stress analysis of the run pipe .13
17 Modification to 13.11.2, Design temperatures for support components .15
18 Modification to 13.11.4, Determination of component sizes .16
19 Modification to 13.11.5, Welded connections .17
20 Modification to 13.11.6, Threaded connections .19


2

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
European foreword
This document (EN 13480-3:2017/prA5:2021) has been prepared by Technical Committee CEN/TC 267
“Industrial piping and pipelines”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
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 EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an 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 as Issue 2 of the new Edition 2022 of the European Standard.
3

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
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
2
(N/mm )
P maximum pressure obtained from the design by formulae or relevant MPa
max
2
procedures for a given component (N/mm )
a
PS maximum allowable pressure bar
b
R, r radii mm
R upper yield strength at room temperature MPa
eH
2
(N/mm )
c
R upper yield strength at calculation temperature t MPa
eH t
2
(N/mm )
R tensile strength at room temperature MPa
m
2
(N/mm )
c
R tensile strength at calculation temperature t MPa
m t
2
(N/mm )
R 0,2 % proof strength at room temperature MPa
p0,2
2
(N/mm )
c
R 0,2 % proof strength at calculation temperature t MPa
p0,2 t
2
(N/mm )
R 1,0 % proof strength at room temperature MPa
p1,0
2
(N/mm )
c
R 1,0 % proof strength at calculation temperature t MPa
p1,0 t
2
(N/mm )
S mean value of the stress which leads to a 1 % creep elongation in 100 000 h MPa
1
2
(N/mm )
S mean value of the stress which leads to a 1 % creep elongation in 200 000 h MPa
2
2
(N/mm )
S Mean value of creep rupture strength according to the material standards, MPa
R T t
2
for material temperature t, and lifetime T (in hours) under consideration (N/mm )
whereby the scatter band does not deviate by more than ± 20 % from the
mean value.
T time h
4

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
t temperature °C
TS maximum allowable temperature °C
3
Z section modulus for a pipe mm
c corrosion or erosion allowance (see Figure 4.3–1) mm
0
c absolute value of the negative tolerance taken from the material standard mm
1
(see Figure 4.3–1)
c thinning allowance for possible thinning during manufacturing process mm
2
(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
2
(N/mm )
f Design stress in the creep range MPa
cr
2
(N/mm )
Design stress for flexibility analysis MPa

f
f
2
(N/mm )
p calculation pressure (see 4.2.3.4) MPa
c
2
(N/mm )
p operating pressure (see 4.2.3.1) MPa
o
2
(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.
5

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
3 Modification to 4.5, Joint coefficient
At the end of 4.5, the paragraph shall read as follows:
See EN 13480-5:2017, Table 8.3-1. In case of the supply of a welded product, the joint coefficient for the
wall thickness calculation should be taken equal to z = 1,0 if the material standard gives the appropriate
requirements concerning destructive tests and non-destructive tests (e.g. EN 10217 series).
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
e= (6.1-1)
2 fz+ p
c
or
pD
ci
(6.1-2)
e=
2 fz− p
c
5 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.
2
6 Modification to 6.4.7.2, Design
The 6th paragraph of 6.4.7.2 shall read as follows:
The required thickness e2 of the knuckle and the cone adjacent to the junction is the greater of econ and ej.
from the junction and 0,7l from the
This thickness shall be maintained for a distance of at least 1,4l2 2
cone/knuckle tangent line along the cone, see Figure 6.4.2-2.
7 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.
8 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
6

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)

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
9 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 Formulas (8.4.1-
eqb
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.
7

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
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
Indent d), 2nd and 3rd 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).
10 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.
8

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
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 linear
m
buckling analysis (bifucation load).
b) Sufficient saftety 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 well
yo
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.
9

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
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

11 Modification to 9.2.1, Symbols
The line concerning p in the Table 9.2.1-1 shall be read as follows:
m
2
p theoretical elastic instability pressure for collapse MPa (N/mm )
m
To be continued
12 Modification to 9.2.2, Elastic stress limits
9.2.2 shall read as follows:
“9.2.2 Stress limits
For pipes not in the creep range the elastic stress limits shall be:
— for non austenitic steels:
SR= (9.2.2-1)
pt0,2
SR= (9.2.2-2)
s p0,2st
— for austenitic steels:
10

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SIST EN 13480-3:2018/oprA5:2021
EN 13480-3:2017/prA5:2021 (E)
R
pt1,0
S= (9.2.2-3)
1,25
R
p1,0st
S = (9.2.2-4)
S
1, 25
For pipes in the creep range the stress limits shall be:
— for n
...

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