Metallic industrial piping - Part 3: Design and calculation

Specifies the design and calculation of industrial metallic piping systems, including supports, covered by EN 13480. Revision of Clause 12 and Annex H related to Stress Intensification Factors SIF

Metallische industrielle Rohrleitungen - Teil 3: Konstruktion und Berechnung

Tuyauteries industrielles métalliques - Partie 3 : Conception et calcul

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Kovinski industrijski cevovodi - 3. del: Konstruiranje in izračun - Dopolnilo A2

General Information

Status
Published
Public Enquiry End Date
04-May-2019
Publication Date
14-Sep-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Aug-2020
Due Date
02-Nov-2020
Completion Date
15-Sep-2020

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SLOVENSKI STANDARD
SIST EN 13480-3:2018/A2:2020
01-oktober-2020
Kovinski industrijski cevovodi - 3. del: Konstruiranje in izračun - Dopolnilo A2
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/A2:2020
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/A2:2020 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/A2:2020
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2020
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 A2 modifies the European Standard EN 13480-3:2017; it was approved by CEN on 12 July 2020.

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, Turkey 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13480-3:2017/A2:2020 E

worldwide for CEN national Members.
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Modification to 3.2, "Symbols and units" ................................................................................................. 5

2 Modification to 4.2, "Loadings"................................................................................................................... 5

3 Modification to 4.3, "Thickness" ................................................................................................................. 5

4 Modification to 12.2.4.2, "Overstrained behaviour" ............................................................................ 6

5 Modification to 12.2.10.3, "Basic assumptions and requirements" ................................................ 6

6 Modification to 12.3, "Flexibility analysis" ............................................................................................. 6

7 Modification to 12.3.2, "Stress due to sustained loads" ...................................................................... 8

8 Modification to 12.3.3, "Stress due to sustained and occasional or exceptional loads" ........... 9

9 Modification to 12.3.4, "Stress range due to thermal expansion and alternating loads" .... 11

10 Modification to 12.3.5, "Additional conditions for the creep range" ........................................... 13

11 Modification to 12.3.6, "Stresses due to a single non-repeated support movement" ............. 13

12 Modification to 12.3.7, "Determination of resultant moments" ................................................... 14

13 Modification to 12.3.8, "Alternative method for stress calculation" ........................................... 16

14 Modification to 13.1.1, "General" ............................................................................................................ 16

15 Modification to 13.1.3.12, .......................................................................................................................... 17

16 Modification to 13.1.3.13, "Pipe support manufacturer" ................................................................ 17

17 Modification to 13.1.3.14, "Main structure designer" ...................................................................... 17

18 Modification to 13.1.3.16, "Occasional load" ...................................................................................... 17

19 Modification to 13.2.1, "General" ............................................................................................................ 17

20 Modification to 13.2.2, "Detail design of pipe supports" ................................................................. 17

21 Modification to 13.3.6, "Identification Marking/Name plate" ...................................................... 18

22 Modification to 13.5, "Rigid struts" ........................................................................................................ 18

23 Modification to 13.6, "Shock arrestors, shock absorbers (snubbers)" ........................................ 18

24 Modification to 13.11, "Manufacturing of pipe supports" .............................................................. 18

25 Modification to 13.11.2.1, "General" ...................................................................................................... 18

26 Modification to 13.11.4, "Determination of component sizes" ...................................................... 18

27 Modification to 13.11.4.2, "Stress levels" ............................................................................................. 18

28 Modification to 13.11.4.3, "Allowable stress" ..................................................................................... 19

29 Modification to 13.11.5.4, "Fillet welds" ............................................................................................... 19

30 Modification to 13.11.6.1, "Threaded connections" .......................................................................... 20

31 Modification to 13.11.9, "Design details for shock arrestors (shock absorbers,

snubbers)" ....................................................................................................................................................... 20

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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
32 Modification to Annex H, “Flexibility characteristics, flexibility and stress
intensification factors and section moduli of piping components and geometrical

discontinuities" .............................................................................................................................................. 20

33 Modification to Annex J, "Type testing of support components" ................................................... 32

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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
European foreword

This document (EN 13480-3:2017/A2:2020) 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 February 2021, and conflicting national standards

shall be withdrawn at the latest by February 2021.

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).

For relationship with EU Directive(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 as Issue 4 of the European Standard.

According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Turkey and the

United Kingdom.
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
1 Modification to 3.2, "Symbols and units"
Table 3.2-1 shall be completed with the line e to be placed after e :
c n
e corroded thickness (see Figure 4.3–1 and Figure 4.3–2) mm
2 Modification to 4.2, "Loadings"
The second sentence of subclause 4.2.4.6 shall read as follows:

“The specification shall give details relating to the characteristics of the seismic conditions (design basis

earthquake and/or safe shut-down earthquake) to be taken into account.”
The last indent of 4.2.5.2.1 shall read as follows:
“— seismic conditions (Design Basis Earthquake).”
3 Modification to 4.3, "Thickness"
The new Figure 4.3-1 shall read as follows:

The key of Figure 4.3-1 shall be updated with the following correction and addition:

c is the thinning allowance for possible thinning during manufacturing process;

e is the wall thickness after corrosion or erosion used for flexibility analysis in Clause 12;

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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
The new Figure 4.3-2 shall read as follows:

The key of Figure 4.3-2 shall be updated with the following correction and addition:

c is the thinning allowance for possible thinning during manufacturing process;

e is the wall thickness after corrosion or erosion used for flexibility analysis in chapter 12;

4 Modification to 12.2.4.2, "Overstrained behaviour"
The first indent shall read as follows:

— Where there is large deflection at the connecting point between two pipes with significantly

different cross section;
5 Modification to 12.2.10.3, "Basic assumptions and requirements"
The last paragraph of subclause 12.2.10.3.1 shall read as follows:

When friction forces are significant, they shall be considered in the piping design.

6 Modification to 12.3, "Flexibility analysis"
The revised Clause 12.3.1 shall read as follows:
“12.3.1 General

The following determination and limitation of stresses shall be used to ensure the safe operation of the

piping.
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)

The Formulae (12.3.2-1) and (12.3.3-1) deal with the longitudinal stresses due to design and operating

loadings, and the Formulae (12.3.4-1) and (12.3.4-2) with the stress range due to such loadings that

gives rise to deformation of the total system.

In Formula (12.3.5-1), one-third of the stress resulting from thermal expansion and alternating loadings

are taken into consideration with respect to the material behaviour in the creep rupture stress range,

assuming that two-thirds will be relieved by relaxation.

Formula (12.3.6-1) ensures that in the event of a single non-repeated load, no strain occurs which can

adversely affect the material.
The forces and moments shall be determined for nominal thickness of the pipe e .

The longitudinal stresses for primary loads shall be determined based on the corroded thickness e .

The longitudinal stresses for thermal expansion and alternating loads shall be determined based on

nominal thickness e .

NOTE Wall thickness reductions, allowed by the technical conditions of delivery for seamless and welded

pipes are covered by the stress limits.

The stress intensification factors, i, i , i , are given in Tables H-1 to H-3 and are calculated based on

i o
nominal wall e .
4 4
π()dd−
The sectional modulus of the nominal pipe is: Z=
32d

Unless specified otherwise, it is assumed that corrosion happens on the inside of the pipe so that the

inner diameter after corrosion is dd− 2e
io c
π(d −−(d 2e ))
o oc
and the sectional modulus of the corroded pipe is: Z =
32d

Using the alternative equations given in 12.3.2 to 12.3.6 with the corresponding stress intensification

factors in Table H-3, allow a more detailed determination of the stresses by considering independently

in-plane and out-of-plane moments .

For the general and the alternative route, the stress intensity factors, i, including the reduction factor

0,75, if defined, shall be greater than or equal to 1,0 (0,75 i ≥ 1,0). If a value less than 1 is obtained then

the value 1,0 shall be used.

If considerable corrosion/erosion is expected, it is taken into account in the flexibility analysis as

follows. In the Formulae (12.3.2-1), (12.3.2-2), (12.3.3-1), (12.3.3-2) and (12.3.4-2), using the sectional

modulus based on the corroded pipe.

Optionally the corrosion may be disregarded during flexibility design, if provisions are taken in order

that corrosion is detected during inspection. In this case Z and e shall be used instead of Z and e in

n c c
these equations.”

For most piping systems, the axial forces in the pipe are dominated by the internal pressure reaction

force. In special cases, such as buried pipes or pipes which are otherwise restrained in axial direction,

the axial stresses from external loads may be significant. In these cases, the axial force Q in

Formulae 12.3.2 to 12.3.6 allows taking into account these effects.
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
7 Modification to 12.3.2, "Stress due to sustained loads"
The revised Clause 12.3.2 shall read as follows:
“12.3.2 Stress due to sustained loads

The sum of primary stresses σ , due to calculation pressure, p , and the resultant moment, M , from

1 c A

weight and other sustained mechanical loads shall satisfy the following equation:

iQ 0,75 iM
QA xA
σ=+≤ f (12.3.2-1)
1 f
where

M is the resultant moment from the sustained mechanical loads which shall be determined by using

the most unfavourable combination of the following loads:
— piping dead weight including insulation, internals and attachments;
— weight of fluid;
— internal pressure forces due to unrelieved axial expansion joints etc.
2
pdπ
Q max Q ,+ Q
xA xS xS
Q is the axial force from the sustained mechanical loads
d is the inner diameter of the corroded pipe
2 2
A ()dd− is the cross section of the pipe (reduced by the corrosion allowances)
c o i

i is the stress intensification factor for axial forces for sustained loads. Unless more precise

information is available i = 1,0
i is the stress intensification factor from Table H.1
is the design stress for flexibility analysis in N/mm (MPa) with .
f f = min f; f
( )
f f cr
or alternatively using the stress intensification factors from Table H.3:
(,0 75 iM ) +(,0 75 i M )
iQ 
ioiA oA
QA xA
t tA
σ= + +≤ f (12.3.2-2)
1 f
AZ Z
cc c
where
M is the in-plane moment from the sustained mechanical loads
M is the out-of-plane moment from the sustained mechanical loads
M is the torsional moment from the sustained mechanical loads
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)

i is the stress intensification factor for torsional moments. Unless more precise

information is available i = 1,0

For the consideration of pressure test loads in Formula (12.3.2-1), the calculation pressure p shall be

replaced by the test pressure p (see EN 13480-5). In addition, the design stress f shall be replaced

test
by a value of 95 % R at test temperature.”
8 Modification to 12.3.3, "Stress due to sustained and occasional or exceptional
loads"
The revised Clause 12.3.3 shall read as follows:
“12.3.3 Stress due to sustained and occasional or exceptional loads

The sum of primary stresses, σ , due to internal pressure, p , resultant moment, M , from weight and

2 c A

other sustained mechanical loads and resultant moment, M , from occasional or exceptional loads shall

satisfy the following equation:
0,,75 iM 0 75 iM
QA x AB
σ=+ +≤ kf (12.3.3-1)
2 f
AZ Z
cc c
where

M is the resultant moment from the occasional or exceptional loads which shall be determined by

using the most unfavourable combination of the following loads:
— wind loads (T ≤ T /10);
— snow loads;
— dynamic loads from switching operations (T ≤ T /100);
— seismic loads (T ≤ T /100);
Q is the axial force from the sustained and occasional or exceptional loads

The axial force shall include the most unfavourable combination of the following loads:

— pressure effect (acting or not);
— sustained loads Q (acting all the time);
— occasional or exceptional loads Q (acting or not, reversing or not).
for reversing loads:
2
pdπ
Q max QQ+ , ++QQ (12.3.3-2)
x xA xB xA xB
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
for non-reversing loads:
 
p ππd p d
 ci ci 
Q max Q , QQ+ , + Q , ++QQ (12.3.3-3)
x xA xA xB xA xA xB
 
 
 

f is the design stress for flexibility analysis in N/mm (MPa) with f = min f; f .

( )
f f cr

k = 1 if the occasional load is acting for more than 10 % in any 24 h operating period, e.g. normal

snow, normal wind;

k = 1,15 if the occasional load is acting for less than 10 % in any 24 h operating period;

k = 1,2 if the occasional load is acting for less than 1 % in any 24 h operating period, e.g. dynamic

loadings due to valve closing/opening, operational basis earthquake;

k = 1,3 for exceptional loads with very low probability e.g. very heavy snow/wind

(i.e. 1,75 times normal);
k = 1,8 for safe shut-down earthquake;

p is the maximum calculation pressure occurring at the considered loading condition, the calculation

pressure shall be taken as a minimum.
or alternatively using the stress intensification factors from Table H.3:
  
0,(75 iM ++M ) 0,75 i (M + M )
ioiA iB oA oB iM + iM
QA x   
t tA t tB
σ + +≤ kf⋅
2 f
AZ Z
cc c
(12.3.3-4)
where
M is the moment from occasional or exceptional loads with the components:
M is the in-plane moment from occasional or exceptional loads
M is the out-of-plane moment from occasional or exceptional loads
M is the torsional moment from occasional or exceptional loads
For reversing loads both signs of M shall be considered.

The effects of anchor displacements due to earthquake may be excluded if they are included in

Formula (12.3.4–1).
Unless specified otherwise, the following agreements apply:

a) the action time T corresponds to the bracketed values referring to the total operating time T ;

b) snow and wind loads are not applied simultaneously;
c) loadings with T ≤ T /100 are not applied simultaneously”;.
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
9 Modification to 12.3.4, "Stress range due to thermal expansion and alternating
loads"
The revised Clause 12.3.4 shall read as follows:
“12.3.4 Stress range due to thermal expansion and alternating loads

The stress range, σ , due to the resultant moment, M , from thermal expansion and alternating loads,

3 C
e.g. seismic loads, shall either satisfy the following equation:
iQ iM
QC xC
σ= +≤ f (12.3.4-1)
3 a
where
A is the nominal cross section of the pipe
2 2
()dd−
o i

i is the stress intensification factor for axial forces for alternating loads. Unless

more precise information is available i = 1,0
iM is the weighted range of resultant moment due to thermal expansion and
alternating loads which shall be determined from the greatest difference
between moments of any two load cases (j and k) using the moduli of elasticity
and stress intensification factors i from Table H.1 at the relevant temperatures
and pressures:
2 2 2
iM max (iM− i M )(+ iM− i M )(+−iM i M )
C j xCj k xCk j yCj k yCk jkzCj zCk
j 11...N; k ...N

The stress free initial state shall be included in the range calculation if relevant.

Q is the range of axial force due to thermal expansion and alternating loads

is the design stress for flexibility analysis in N/mm (MPa) from Formula (12.1.3–1)

or where the conditions of Formula 12.3.4-1 are not met, the sum of stresses, σ , due to calculation

pressure p , resultant moment, M , from sustained mechanical loads and the resultant moment, M ,

A C

from thermal expansion and alternating loads shall satisfy the following equation:

σ=σσ+ ≤ f+ f (12.3.4-2)
4 1 3 f a
or alternatively using the stress intensification factors from Table H.3:
22 2
(iM )(+ i M )
iQ 
QC xC ioiC oC
t tC
σ= + +≤ f (12.3.4-3)
3 a
AZ Z
where
M is the in-plane moment range due to thermal expansion and alternating loads
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)

M is the out-of-plane moment range due to thermal expansion and alternating loads

M is the torsional moment range due to thermal expansion and alternating loads

The above equation assumes that the moment range can be calculated as the difference between one

thermal expansion load case and the stress free initial condition.

In the case of multiple load situations with different temperature and pressure situations the stress

range (Formula 12.3.4-4) is the maximum difference between all pairs (j,k) of thermal expansion or

alternating load cases calculated in the following way:
2 2
i Q −−i Q (iM − i M )(+ i M − i M ) iM i M
ij iCj ik iCk oj oCj ok oCk
Qj xCj Qk xCk tj tCj tk tCk
σ=max + +≤ f
3  a
AZ Z
j 11...N; k ...N
(12.3.4-4)
where

N is the number of load cases which contribute to thermal expansion or alternating

loads

i is the stress intensification factor for axial forces in the load case L. Unless more

precise information is available i = 1,0

i is the stress intensification factor for in-plane moments in the load case L taken

from Table H.3 using the relevant operation conditions

i is the stress intensification factor for out-of-plane moments in the load case L

taken from Table H.3 using the relevant operation conditions

i is the stress intensification factor for torsional moments in the load case L. Unless

more precise information is available i = 1,0
M is the in-plane moment in load case L
iCL
M is the out-of-plane moment in load case L
oCL
M is the torsional moment in load case L
tCL

or where the conditions of Formula 12.3.4-4 are not met, the sum of stresses, σ , due to calculation

pressure p , resultant moment, M , from sustained mechanical loads and the resultant moment, M ,

c A C

from thermal expansion and alternating loads shall satisfy the Formula (12.3.4-2).

Particular attention shall be given to:

— longitudinal expansion, including terminal point movements, due to thermal expansion and

internal pressure;

— anchor point movements due to earthquake if anchor displacement effects were omitted from

Formula (12.3.3-1) or (12.3.3-2);
— anchor point movements due to wind;
— frictional forces.
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)

The condition of the piping during shut-down shall be also considered. Cold pull, if any, applied during

installation shall not be taken into account, i.e. the operating case pertinent to M shall be so designed

as if no cold pulling was applied unless the cold state including cold pull is also considered in the

calculation of the stress range.”
10 Modification to 12.3.5, "Additional conditions for the creep range"
The revised Clause 12.3.5 shall read as follows:
“12.3.5 Additional conditions for the creep range

For piping operating within the creep range, the stresses, σ , due to calculation pressure, p , resultant

5 c

moment, M , from weight and other sustained mechanical loadings, and to resultant moment, M , from

A C

thermal expansion and alternating loadings, shall satisfy the following equation:

iQ 0,75 iM
QC xC C
σ=σ++ ≤ f (12.3.5-1)
5 1 CR
33AZ
or alternatively using the stress intensification factors from Table H.3:
 
M M iM
QC xC
iC2 oC 2 t tC
σ=σ++ (,0 75 ii)+(,0 75 ) + ≤ f
5 1 io CR
3A 3Z 33ZZ
 
 
(12.3.5-2)

In Formula (12.3.5-1), one-third of the moment M is considered with respect to the material behaviour

in the creep rupture stress range, unless confirmed otherwise by detailed inelastic analysis.”.

11 Modification to 12.3.6, "Stresses due to a single non-repeated support
movement"
The revised Clause 12.3.6 shall read as follows:
“12.3.6 Stresses due to a single non-repeated support movement

Where the design stress as given in Clause 5 is time-independent, the stress, σ , due to resultant

moment, M , from a single non-repeated support movement, shall satisfy the following equation:

iQ iM
QD xD
σ= +≤ f (12.3.6-1)
6 D
where
M is the resultant moment from a single non-repeated anchor/restraint
movement e.g. terminal point movements due to settlement of buildings,
or due to damage caused by mining.
i is the stress intensification factor for axial forces for single non repeated
support movement load. Unless more precise information is available,
i = 1,0
Q is the axial force due to non-repeated anchor/restraint movement
for ferritic steels and austenitic steels with A < 30 %
f = min (R ; 2R )
Dm p0,2 t
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SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
for austenitic steels with A ≥ 30 %
f = min (R ; 2R )
Dm p1.0 t
or alternatively using the stress intensification factors from Table H.3:
22 2
(iM )(+ i M )
iQ 
QD xD ioiD oD
t tD
σ= + +≤ f (12.3.6-2)
6 D
AZ Z
where
M is the in-plane moment due to non-repeated anchor/restraint movement
M is the out-of-plane moment due to non-repeated anchor/restraint movement
M is the torsional moment due to non-repeated anchor/restraint movement

Where the design stress as given in Clause 5 is time-dependent, the calculated stress shall not exceed

the following:

— 0,3 times 0,2 % proof strength for ferritic steels at the calculation temperature;

— 0,3 times 1,0 % proof strength for austenitic steels at the calculation temperature.

NOTE It is possible that a small part of the piping system will undergo considerable inelastic strain when the

rest of the system is almost entirely elastic. This happens when the part concerned is appreciably weaker than the

rest, either due to reduced section size, weaker material or higher temperature. Conditions likely to cause

significant inelastic strain should preferably be avoided. If this is not possible, a more complete inelastic analysis

should be undertaken.”.
12 Modification to 12.3.7, "Determination of resultant moments"
The revised Clause 12.3.7 shall read as follows:
“12.3.7 Determination of resultant moments

When determining the moment values M , M , M and M , used in equations given in 12.3.2 to 12.3.6,

A B C D
the following basic rules shall be considered.

For n simultaneously applied moments M (i = 1, 2, ..., n) with the coordinates M , M , M referred to a

i xi yi zi

right-angle coordinate system x, y, z the total resultant moment M is the sum of moments:

 
 ∑
 xi
x n
 
M M M (12.3.7-1)
yyi
 1 
 
 M
∑ 
 
and
22 2
M M++M M (12.3.7-2)
x yz

Examples for moments on a T-piece and on a bend are given in Figures 12.3.7-1 and –2.

---------------------- Page: 16 ----------------------
SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
Key
M is the out-of-plane bending moment;
M is the in-plane bending moment;
M is the torsional moment;
222
is the resultant moment M + M + M
o i T
Figure 12.3.7-1— Moments on a T-piece
---------------------- Page: 17 ----------------------
SIST EN 13480-3:2018/A2:2020
EN 13480-3:2017/A2:2020 (E)
Key
M is the out-of-plane bending moment;
M is the in-plane bending moment;
M is the torsional moment;
222
is the resultant moment M + M + M
o i T
Figure 12.3.7-2 — Moments on a bend
13 Modification to 12.3.8, "Alternative method for stress calculation"
...

SLOVENSKI STANDARD
SIST EN 13480-3:2018/oprA2:2019
01-april-2019
.RYLQVNLLQGXVWULMVNLFHYRYRGLGHO.RQVWUXLUDQMHLQL]UDþXQ'RSROQLOR$
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/prA2
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/oprA2:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 13480-3:2018/oprA2:2019
---------------------- Page: 2 ----------------------
SIST EN 13480-3:2018/oprA2:2019
DRAFT
EUROPEAN STANDARD
EN 13480-3:2017
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA2
March 2019
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 A2, 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, 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 13480-3:2017/prA2:2019 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

1 Modification to 3.2, Symbols and units .................................................................................................... 4

2 Modification to 4.2, Loadings ...................................................................................................................... 4

3 Modification to 4.3, Thickness ..................................................................................................................... 4

4 Modification to 12.2.4.2, Overstrained behaviour ............................................................................... 5

5 Modification to 12.2.10.3, Basic assumptions and requirements ................................................... 5

6 Modification to 12.3, Flexibility analysis ................................................................................................. 5

7 Modification to 12.3.2, Stress due to sustained loads ......................................................................... 6

8 Modification to 12.3.3, Stress due to sustained and occasional or exceptional loads .............. 8

9 Modification to 12.3.4, Stress range due to thermal expansion and alternating loads ........... 9

10 Modification to 12.3.5, Additional conditions for the creep range............................................... 11

11 Modification to 12.3.6, Stresses due to a single non-repeated support movement ................ 12

12 Modification to 12.3.7, Determination of resultant moments ....................................................... 13

13 Modification to 12.3.8, Alternative method for stress calculation ............................................... 15

14 Modification to 13.1.1, General ............................................................................................................... 15

15 Modification to 13.1.3.16, Occasional load .......................................................................................... 15

16 Modification to 13.3.6, Identification Marking/Name plate .......................................................... 16

17 Modification to 13.11.4.3, Allowable stress ......................................................................................... 16

18 Modification to Annex H, Flexibility characteristics, flexibility and stress
intensification factors and section moduli of piping components and geometrical

discontinuities ................................................................................................................................................ 16

19 Modification to Annex J, Type testing of support components ...................................................... 27

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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)
European foreword

This document (EN 13480-3:2017/prA2:2019) 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 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 this

document.

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 European Standard.
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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)
1 Modification to 3.2, Symbols and units
Table 3.2-1 shall be completed with the line e to be placed before e : “
c n
e corroded thickness (see Figure 4.3-1 and Figure 4.3-2) mm
2 Modification to 4.2, Loadings
The last indent of 4.2.5.2.1 shall read as follows:
“— seismic conditions (Operational Basis Earthquake).”.
3 Modification to 4.3, Thickness
The new Figure 4.3-1 shall read as follows: “

The key of Figure 4.3-1 shall be updated with the following correction and addition: “

c is the thinning allowance for possible thinning during manufacturing process;

e is the wall thickness after corrosion or erosion used for flexibility analysis in Clause 12”;.

The new Figure 4.3-2 shall read as follows: “
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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)

The key of Figure 4.3-2 shall be updated with the following correction and addition: “

c is the thinning allowance for possible thinning during manufacturing process”;,

e is the wall thickness after corrosion or erosion used for flexibility analysis in Clause 12”;.

4 Modification to 12.2.4.2, Overstrained behaviour
The first indent shall read as follows: “

— highly stressed small size pipe runs in series with longer and relatively flexible pipe runs”;.

5 Modification to 12.2.10.3, Basic assumptions and requirements
The last paragraph of sub-clause 12.2.10.3.1 shall read as follows:

“When friction forces are significant, they shall be considered in the piping design.”.

6 Modification to 12.3, Flexibility analysis
The revised sub-clause 12.3.1 shall read as follows:
”12.3.1 General

The following determination and limitation of stresses shall be used to ensure the safe operation of the

piping.

The Formulae (12.3.2-1) and (12.3.3-1) deal with the longitudinal stresses due to design and operating

loadings, and the Formulae (12.3.4-1) and (12.3.4-2) with the stress range due to such loadings that

gives rise to deformation of the total system.
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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)

In Formula (12.3.5-1), one-third of the stress resulting from thermal expansion and alternating loadings

are taken into consideration with respect to the material behaviour in the creep rupture stress range,

assuming that two-thirds will be relieved by relaxation.

Formula (12.3.6-1) ensures that in the event of a single non-repeated load, no strain occurs which can

adversely affect the material.
The forces and moments shall be determined for nominal thickness of the pipe e .

The longitudinal stresses for primary loads shall be determined based on the corroded thickness e .

The longitudinal stresses for thermal expansion and alternating loads shall be determined based on

nominal thickness e .

NOTE Wall thickness reductions, allowed by the technical conditions of delivery for seamless and welded

pipes are covered by the stress limits.

The stress intensification factors, i, i , i , are given in Tables H-1 to H-3 and are calculated based on

i o
nominal wall e .
4 4
π()dd−
The sectional modulus of the nominal pipe is: Z =
32d

Unless specified otherwise, it is assumed that corrosion happens on the inside of the pipe so that the

inner diameter after corrosion is dd− 2e
i o c
π(d −−(d 2e ))
o oc
and the sectional modulus of the corroded pipe is: Z =
32d

As an alternative route to equations given in 12.3.2 to 12.3.6, a more detailed determination of the

stresses by separating in-plane and out-of-plane moments can be performed, using the corresponding

stress intensification factors in Table H-3.

For most piping systems, the axial forces in the pipe are dominated by the internal pressure reaction

force. In special cases, such as buried pipes or pipes which are otherwise restrained in axial direction,

the axial stresses from external loads may be significant. In these cases, the axial force Q in

Formulae 12.3.2 to 12.3.6 allows taking into account these effects.

For the general and the alternative route, the stress intensity factors, i, including the reduction factor

0,75, if defined, shall be greater than or equal to 1,0 (0,75 i ≥ 1,0). If a value less than 1 is obtained then

the value 1,0 shall be used.

If considerable corrosion/erosion is expected, it is taken into account in the flexibility analysis as

follows. In the Formulae (12.3.2-1), (12.3.2-2), (12.3.3-1), (12.3.3-2) and (12.3.4-2), using the sectional

modulus based on the corroded pipe.

Optionally the corrosion may be disregarded during flexibility design, if provisions are taken in order

that corrosion is detected during inspection. In this case Z and e shall be used instead of Z and e in

n c c
these equations.”.
7 Modification to 12.3.2, Stress due to sustained loads
The revised sub-clause 12.3.2 shall read as follows:
“12.3.2 Stress due to sustained loads

The sum of primary stresses σ , due to calculation pressure, p , and the resultant moment, M , from

c A

weight and other sustained mechanical loads shall satisfy the following equation:

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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)
iQ 0,75 iM
QA xA A
σ= +≤ f (12.3.2-1)
1 f
where

M is the resultant moment from the sustained mechanical loads which shall be determined by

using the most unfavourable combination of the following loads:
— piping dead weight including insulation, internals and attachments;
— weight of fluid;
— internal pressure forces due to unrelieved axial expansion joints, etc.
pdπ
Q max( Q ,+ Q )
xA xS xS
is the axial force from the sustained mechanical loads;
QxS
d is the inner diameter of the corroded pipe;
2 2
A ()dd− is the cross section of the pipe (reduced by the corrosion allowances);
o i

i is the stress intensification factor for axial forces for sustained loads. Unless more precise

information is available i = 1,0 ;
i is the stress intensification factor from Table H.1;

f is the design stress for flexibility analysis in N/mm (MPa) with f = min f; f .

( )
f f cr
or alternatively using the stress intensification factor from Table H.3:
22 2
(,0 75 iM ) +(,0 75 i M )
iQ 
ioiA oA
QA xA
t tA
(12.3.2-2)
σ= + +≤ f
1 f
AZ Z
cc c
where
M is the in-plane moment from the sustained mechanical loads;
M is the out-of-plane moment from the sustained mechanical loads;
M is the torsional moment from the sustained mechanical loads;

it is the stress intensification factor for torsional moments. Unless more precise information is

available i = 1,0.

For the consideration of pressure test loads in Formula (12.3.2-1), the calculation pressure p shall be

replaced by the test pressure p (see EN 13480-5). In addition, the design stress f shall be replaced by

test f
a value of 95 % R at test temperature.”.
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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)
8 Modification to 12.3.3, Stress due to sustained and occasional or exceptional
loads
The revised sub-clause 12.3.3 shall read as follows:
“12.3.3 Stress due to sustained and occasional or exceptional loads

The sum of primary stresses, σ , due to internal pressure, p , resultant moment, M , from weight and

2 c A

other sustained mechanical loads and resultant moment, M , from occasional or exceptional loads shall

satisfy the following equation:
0,,75 iM 0 75 iM
QA x AB
σ=+ +≤ kf (12.3.3-1)
2 f
AZ Z
cc c
where

MB is the resultant moment from the occasional or exceptional loads which shall be determined by

using the most unfavourable combination of the following loads:
— wind loads (T ≤ T /10);
— snow loads;
— dynamic loads from switching operations (T ≤ T /100);
— seismic loads (T ≤ T /100);
Q is the axial force from the sustained and occasional or exceptional loads.

The axial force shall include the most unfavourable combination of the following loads:

— pressure effect (acting or not);
— sustained loads Q (acting all the time);
— occasional or exceptional loads Q (acting or not, reversing or not).
pdπ
for reversing loads: Q max( QQ+ , ++QQ ) (12.3.3-2)
x xA xB xA xB
2 2
pdππpd
ci c i
for non-reversing loads: Q max( Q , QQ+ , + Q , ++QQ ) (12.3.3-3)
x xA xA xB xA xA xB
4 4

f is the design stress for flexibility analysis in N/mm (MPa) with f = min f; f .

( )
f f cr

k = 1 if the occasional load is acting for more than 10 % in any 24 h operating period, e.g. normal

snow, normal wind;

k = 1,15 if the occasional load is acting for less than 10 % in any 24 h operating period;

k = 1,2 if the occasional load is acting for less than 1 % in any 24 h operating period, e.g. dynamic

loadings due to valve closing/opening, operational basis earthquake;
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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)

k = 1,3 for exceptional loads with very low probability e.g. very heavy snow/wind

(i.e. = 1,75 × normal);
k = 1,8 for safe shut-down earthquake;

p is the maximum calculation pressure occurring at the considered loading condition, the

calculation pressure shall be taken as a minimum.
or alternatively using the stress intensification factor from Table H.3:
  
0,(75 iM ++M ) 0,75 i (M + M )
iQ 
ioiA iB oA oB iM + iM
QA x   
tttA tB
σ + + ≤ kf⋅
2 f
 
AZ Z
cc c
(12.3.3-4)
where
M is the moment from occasional or exceptional loads with the components:
M is the in-plane moment from occasional or exceptional loads;
M is the out-of-plane moment from occasional or exceptional loads;
M is the torsional moment from occasional or exceptional loads.
For reversing loads both signs of M shall be considered.

The effects of anchor displacements due to earthquake may be excluded if they are included in

Formula (12.3.4-1).
Unless specified otherwise, the following agreements apply:

a) the action time T corresponds to the bracketed values referring to the total operating time T ;

b) snow and wind loads are not applied simultaneously;
c) loadings with T ≤ T /100 are not applied simultaneously”;.
9 Modification to 12.3.4, Stress range due to thermal expansion and alternating
loads
The revised sub-clause 12.3.4 shall read as follows:
“12.3.4 Stress range due to thermal expansion and alternating loads

The stress range, σ , due to the resultant moment, M , from thermal expansion and alternating loads, e.g.

3 C
seismic loads, shall either satisfy the following equation:
iQ iM
QC xC C
σ= +≤ f (12.3.4-1)
3 a
where
2 2
A ()dd− is the nominal cross section of the pipe;
o i
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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)

i is the stress intensification factor for axial forces for alternating loads. Unless more precise

information is available i = 1,0 ;

iM is the weighted range of resultant moment due to thermal expansion and alternating loads

which shall be determined from the greatest difference between moments of any two load cases (j

and k) using the moduli of elasticity and stress intensification factors i from Table H.1 at the

relevant temperatures and pressures:
2 2 2
iM max (iM− i M )(+ iM− i M )(+−iM i M )
C j xCj k xCk j yCj k yCk jkzCj zCk
j 11,,Nk ,N

The stress free initial state shall be included in the range calculation if relevant.

Q is the range of axial force due to thermal expansion and alternating loads;

f is the design stress for flexibility analysis in N/mm (MPa) from Formula (12.1.3-1).

or where the conditions of Formula 12.3.4-1 are not met, the sum of stresses, σ , due to calculation

pressure p , resultant moment, M , from sustained mechanical loads and the resultant moment, M , from

c A C
thermal expansion and alternating loads shall satisfy the following equation:
(12.3.4-2)
σ = σσ+ ≤ f + f
4 1 3 f a
or alternatively using the stress intensification factor from Table H.3:
22 2
(iM )(+ i M )
iQ  
ioiC oC
QC xC
t tC
σ= + +≤  f (12.3.4-3)
3 a
 
AZ Z
 
where
M is the in-plane moment range due to thermal expansion and alternating loads;

M is the out-of-plane moment range due to thermal expansion and alternating loads;

M is the torsional moment range due to thermal expansion and alternating loads.

The above equation assumes that the moment range can be calculated as the difference between one

thermal expansion load case and the stress free initial condition.

In the case of multiple load situations with different temperature and pressure situations the stress

range (Formula (12.3.4-4)) is the maximum difference between all pairs (j,k) of thermal expansion or

alternating load cases calculated in the following way:
2 2
(iM − i M )(+ i M − i M )
i Q − iQ
ij iCj ik iCk oj oCj ok oCk
Qj xCj Qk xCk
σ max ≤ f
3 a
iM − i M
tj tCj tk tCk
j 11,,Nk ,N
(12.3.4-4)
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SIST EN 13480-3:2018/oprA2:2019
EN 13480-3:2017/prA2:2019 (E)
where

N is the number of load cases which contribute to thermal expansion or alternating loads;

i is the stress intensification factor for axial forces in the load case L. Unless more precise

information is available i = 1,0 ;

i is the stress intensification factor for in-plane moments in the load case L taken from Table H.3

using the relevant operation conditions;

i is the stress intensification factor for out-of-plane moments in the load case L taken from

Table H.3 using the relevant operation conditions;

i is the stress intensification factor for torsional moments in the load case L. Unless more precise

information is available i = 1,0 ;
M is the in-plane moment in load case L;
iCL
M is the out-of-plane moment in load case L;
oCL
M is the torsional moment in load case L.
tCL

or where the conditions of Formula 12.3.4-4 are not met, the sum of stresses, σ , due to calculation

pressure p , result
...

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