EN 13480-3:2012/A1:2017

SLOVENSKI STANDARD
SIST EN 13480-3:2012/oprA1:2016
01-september-2016
.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 13480-3:2012/prA1
ICS:
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
SIST EN 13480-3:2012/oprA1:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 13480-3:2012/oprA1:2016

SIST EN 13480-3:2012/oprA1:2016

DRAFT
EUROPEAN STANDARD
EN 13480-3:2012
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
July 2016
ICS 23.040.01
English Version
Metallic industrial piping - Part3: 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 A1, if approved, will modify the European Standard EN 13480-3:2012. 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13480-3:2012/prA1:2016 E
worldwide for CEN national Members.

SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
Contents Page
European foreword . 4
1 Modifications to Clause 2. 5
2 Modification to Clause 3. 5
3 Modification to 4.1 . 5
4 Modification to 4.2.3.4 . 5
5 Modification to 4.3 . 6
6 Modification to 4.6 . 8
7 Modification to 5.2.2 . 8
8 Modification to 5.2.2.2 . 8
9 Modification to 5.2.5.1 . 8
10 Modification to 5.3.1 . 9
11 Modification to 5.3.2.1 . 9
12 Modification to 6.2.3.2 . 10
13 Modification to 6.3.1 . 10
14 Modification to 6.3.2 . 11
15 Modification to 6.4.1 . 11
16 Modification to 6.4.4 . 11
17 Modification to 6.4.6.2 . 12
18 Modification to 6.4.6.3 . 13
19 Modification to 6.4.7.3 . 13
20 Modification to 6.4.8.3 . 13
21 Modification to 6.6.1 . 13
22 Modification to 6.6.2 . 13
23 Modification to 6.6.3 . 14
24 Modification to 6.6.4 . 14
25 Modification to 7.1.2 . 14
26 Modification to 7.2.3.2 . 15
27 Modification to 7.2.3.3 . 15
28 Modification to 7.2.4.3 . 16
29 Modification to 7.2.5.2 . 19
30 Modification to 8.3.1 . 19
31 Modification to 8.3.2 . 19
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EN 13480-3:2012/prA1:2016 (E)
32 Modification to 8.3.9 . 19
33 Modification to 8.4.4 . 20
34 Modification to 8.6.1 . 20
35 Modification to 8.6.3 . 21
36 Modification to 10.2 . 21
37 Modification to 10.3.1 . 21
38 Modification to 10.3.2.2 . 21
39 Modification to 10.3.2.3 . 21
40 Modification to 10.5 . 22
41 Modification to 12.1.3.2 . 22
42 Modification to 12.2.2 . 22
43 Modification to 12.2.10.3 . 22
44 Modification to 12.3.1 . 22
45 Modification to 12.3.2 . 23
46 Modification to 12.3.4 . 23
47 Modification to 12.3.6 . 23
48 Modification to 12.3.8 . 23
49 Modification to Clause 13 . 24
13 Pipe Supports . 24
50 Modification to Annex C . 44
51 Modification to Annex D . 44
52 Modification to Annex E . 44
53 Modification to Clause I.3 . 44
54 Modification to Clause K.1 . 49
55 Modification to Annex N . 49
56 Modification to Annex P . 51
57 Modification to Annex ZA . 51
58 Modification to Bibliography. 51

SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
European foreword
This document (EN 13480-3:2012/prA1:2016) 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 integral part of EN 13480-
3:2012.
This document includes the text of the amendment itself. The amended/corrected pages of
EN 13480-3:2012 will be published in the new Edition 2017 of the European Standard.
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
1 Modifications to Clause 2
The list of normative references shall be updated as follows:
Replace reference EN 1591-1:2001+A1:2009+AC:2011 by EN 1591-1:2013, Flanges and their joints —
Design rules for gasketed circular flange connections — Part 1: Calculation
Add reference EN 10216-2:2013, Seamless steel tubes for pressure purposes — Technical delivery
conditions — Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
Delete reference EN 12953-3:2002, Shell boilers — Part 3: Design and calculation for pressure parts
2 Modification to Clause 3
In Table 3.2-1, add the following definition at the top of the table:
Symbol Description Unit
P maximum pressure obtained from the design by formulae or relevant MPa (N/mm²)
max
procedures for a given component
3 Modification to 4.1
As the last paragraph of 4.1, add the new following text:
Piping for fluids which are likely to cause condensation shall be installed with adequate slopes and
traps.
4 Modification to 4.2.3.4
The sub-clause 4.2.3.4 shall read as follows:
For all pressure temperature conditions (p , t ) specified in 4.2.3.3 calculation pressures p shall be
o o c
determined.
The calculation pressure p shall be not less than the associated operating pressure p , taking into
c o
account the adjustments of the safety devices. The conditions (p , t ) resulting in the greatest wall
o o
thickness shall be considered.
The pressure equipment may be designed with a design pressure/temperature combination (p , t )
c c
which results in the highest calculated wall thickness or the highest stress, and which is based on the
, t ) under normal operating conditions (see EN 764-1:2015,
pressure/temperature combination (po o
Figure A.1). In this case the design pressure p , associated with the design temperature t , can be lower
c c
than PS.
NOTE 1 For guidance, designation of p and t is p and t in EN 764-1:2015, Figure A.1.
c c d d
The design of the pressure equipment should be consistent with PS and TS , that is:
max
— compatible with the combination of PS with the temperature T(p ) where p is the maximum
omax omax
pressure under normal operating conditions;
— compatible with the combination of TS at the pressure P(t ) where t is the maximum
max omax omax
temperature under normal operating conditions.
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
NOTE 2 If there is a condition where p = PS and t =TS, only this condition has to be calculated.
o o
When the calculation temperature t is such that the creep rupture strength characteristics are relevant
c
for the determination of the nominal design stress, the calculation pressure shall be considered equal to
the operating pressure (p ) which is associated with the corresponding temperature (t ).
o o
5 Modification to 4.3
The sub-clause 4.3 shall read as follows:
The minimum thickness shall be determined with regard to the manufacturing process for pipes and
fittings.
Corrosion can be internal or external or both at the same time (the term corrosion includes erosion).
The value of the corrosion allowance c (which may be zero if no corrosion is to be expected) shall be
determined by the manufacturer in accordance with the nature, temperature, pressure, velocity etc. of
the products in contact with the wall, only if all this information has been given by the purchaser.
Corrosion allowance should be given by the purchaser, if not, reasonable values shall be proposed by
the manufacturer and stated in the documentation.
All thicknesses, the corrosion allowance c , the tolerance c and the thinning c are shown in Figures 4.3-
0 1 2
1 and 4.3-2.
th
As the 6 paragraph of 4.3, add the new following text:
Piping which is subjected to external corrosive influences and is made of materials which are not
sufficiently corrosion resistant shall be protected against corrosion, if no suitable corrosion allowance is
provided.
In the key, below Figure 4.3-1, c shall read as follows:
c is the thinning allowance for possible thinning during manufacturing process (e.g. due to bending,
swaging, threading, grooving, etc);
The title of the Figure 4.3-1 shall read as follows:
Figure 4.3-1 — Thickness (applicable to straight pipes as well as bends) when ordered with
mean wall thickness
After Figure 4.3-1, add a new Figure 4.3-2 and the text below Figure 4.3-2 shall read as follows:

SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
Where
e see Figure 4.3-1;
c see Figure 4.3-1;
c positive tolerance given by the pipe supplier, see also EN 10216-2:2013, Table 9 or Table 10;
c see Figure 4.3-1;
ε is the additional thickness resulting from the selection of the ordered thickness e ;
ord
e see Figure 4.3-1;
ord
e see Figure 4.3-1;
n
e is the expected (mean) wall thickness.
exp
Figure 4.3-2 — Thickness (applicable to straight pipes as well as bends) when ordered with
minimum wall thickness and plus‐tolerances only
The Figure 4.3‐1 shows the situation when pipes are ordered with mean wall thickness and +/‐
tolerances, see also EN 10216‐2:2013, Table 7 or Table 8.
For pipes, ordered with minimum wall thickness and plus‐tolerances only, see Table 9 or Table 10 in
EN 10216‐2:2013, the Figure 4.3‐2 shall be used. In this case for the flexibility and stress calculation of
piping the expected wall thickness e = e + ½ c should be used instead of e in the Equations of
exp ord 1 n
Clause 12.
The analysis thickness e shall be the lowest thickness after corrosion and shall be given by:
a
ε = ε + ε (4.3-1)
a
or
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
ε = ε − c − c − c (4.3-2)
a ord 0 1 2
when pipes are ordered with mean wall thickness, see Figure 4.3‐1.
When pipes are ordered with minimum wall thickness and plus‐tolerances, see Figure 4.3‐2, the
analysis thickness e shall be:
a
ε = ε − c − c (4.3-3)
a ord 0 2
The sequence of the numbering of the equations shall be updated. The current equation (4.3-3) shall be
renumbered (4.3-4) and the current equation (4.3-4) shall be renumbered (4.3-5).
At the end of sub-clause 4.3, the following NOTE shall be added:
NOTE When pipes are ordered with minimum wall thickness and plus tolerance, see Figure 4.3-2, the
value of the tolerance in Equation (4.3-4) needs to be set to c = 0 or in Equation (4.3-5) x = 0.
6 Modification to 4.6
nd st
In 4.6, the 2 sentence of the 1 paragraph shall read as follows:
This may be completed or replaced by a "design by analysis" as described in EN 13445-3, Annexes B
and C, where applicable.
In 4.6, the following paragraph shall be deleted:
Clauses 6, 7, 8, 9, 10 and 11 describe the "design by rules" of piping components under static and cyclic
loadings. The « design by rule » can be completed or replaced by a « design by analysis » as described in
EN 13445-3, Annex B and Annex C, where applicable.
7 Modification to 5.2.2
At the end of the sub-clause 5.2.2.1, add the following sentence:
When different rupture elongation values for longitudinal and transverse directions are provided in the
material standard, the lowest value shall be used.
8 Modification to 5.2.2.2
The sub-clause 5.2.2.2 shall read as follows:
For A ≥ 35 %, the designer shall ensure that the stress under the proof test conditions, given in
EN 13480-5, shall not exceed the greater of the two following values:
— 95 % R at specified test temperature;
p1,0
— 45 % R at specified test temperature.
m
For A < 35 %, see 5.2.1.2.
9 Modification to 5.2.5.1
After the first paragraph of 5.2.5.1, the following sentence shall be added:
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
These steels shall be subjected to a positive material inspection prior to use, to ensure weldability.
10 Modification to 5.3.1
The sub-clause 5.3.1 shall read as follows:
For welds other than circumferential welds in welded pipes and fittings, the creep strength values of the
weld shall be considered if ensured values are available. Otherwise the minimum of either the creep
strength values of the base material or the filler material shall be reduced by 20 %.
For circumferential butt welds the necessity of the consideration of reduced creep strength values
depends on the stress distribution in the cross section. Detailed stress analyses may be used.
11 Modification to 5.3.2.1
The sub-clause 5.3.2.1 shall read as follows:
5.3.2.1 Design conditions
The design stress in the creep range f to be used for design under static loading shall be:
cr
S
RTt
f = (5.3.2-1)
cr
Sf
cr
where
S f is a safety factor which depends on the design life time and shall be in accordance with
cr
Table 5.3.2-1.
Table 5.3.2-1 — Safety factor as a function of mean creep rupture strength related to time
a)
Design lifetime Without surveillance of creep With surveillance of creep
c) c)
exhaustion exhaustion
Mechanical Mechanical
t [h] Sfcr Sfcr
property property
10 000 ≤ t ≤ 100 000 S 1,5 S 1,25
RTt RTt
d) d)
100 000 < t < 200 000 S 1,5 S 1,25
RTt RTt
S /200 000 h 1,25
RT
d) d) b)
t = 200 000 S 1,5 S /150 000 h 1,35
RTt RT
b)
S /100 000 h 1,5
RT
a)
If the design lifetime is not specified, the mean creep rupture strength at 200 000 h shaII be used with the
associated Sf .
cr
b)
Only in cases where the 200 000 h values are not specified in the material standards, the mean creep rupture
strength at 150 000 h or 100 000 h shall be used for a design lifetime of 200 000 h with the associated Sf .
cr
c)
Surveillance by means of non-destructive testing and/or additional calculations of creep damage, D .
c
S
RT /200000h
d)
Allowed only if ≥ 0,781 to ensure that 60% of theoretical creep damage are not exceeded at
S
RT /100000h
200 000 h.
In cases where a design life shorter than 100 000 h is specified, one of the following methods shall be
used:
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
a) If lifetime monitoring is not performed, the safety factor Sf shall be equal to 1,5 and shall be
cr
applied to the mean creep rupture strength at the design lifetime of at least 10 000 h;
b) If lifetime monitoring is performed, a safety factor of Sf = 1,25 may be specified with regard to the
cr
mean creep rupture strength at the design lifetime of at least 10 000 h. In no case the 1% creep
strain limit (mean value) at design lifetime shall be exceeded.
The creep rupture strength associated to the specified lifetime shall be interpolated based on a
logarithmic time axis as well as a logarithmic stress axis (double logarithmic interpolation scheme).
12 Modification to 6.2.3.2
The existing sub-clause 6.2.3.2 "Alternative route" shall be deleted, the current sub-clause 6.2.3.3 "More
accurate route" shall be renumbered 6.2.3.2 and the Table 6.2.3-1 shall be modified as follows:
Table 6.2.3-1 — Minimum pipe wall thickness before bending by induction
Radius Normal route 6.2.3.1
10 D 1,02 e
o
8 D 1,03 e
o
6 D 1,04 e
o
5 Do 1,04 e
4 D 1,05 e
o
3 D 1,06 e
o
2,5 D 1,08 e
o
2 D 1,10 e
o
1,5 D 1,15 e
o
13 Modification to 6.3.1
The sub-clause 6.3.1 shall read as follows:
6.3.1 General
The following rules for mitre bends (see Figure 6.3.2-1) shall only be used if the following conditions
are met:
A mitre bend with an angle of change in direction at a single joint greater than 22,5 ° (see angle α in
Figure 6.3.2-1) shall not be used under cyclic loadings (> 7 000 cycles).
In addition, for time dependent design stress, consideration of high temperature cycling should be given.
NOTE For an angle of change in direction of 3 ° or less at a single joint, the calculation method given in 6.1
may be used.
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
14 Modification to 6.3.2
The revised Figure 6.3.2-1 shall read as follows:

NOTE α = 2 θ
Figure 6.3.2-1 — Scheme for a mitre bend
15 Modification to 6.4.1
The first indent of sub-clause 6.4.1 shall read as follows:
— cones for which the half angle at the apex of the cone is greater than 60°;
16 Modification to 6.4.4
Equation (6.4.4-1) shall read as follows:
pD
ci
e = (6.4.4-1)
con
2fz −p cosα
c
Equation (6.4.4-2) shall read as follows:
pD 1
ce
e = (6.4.4-2)
con
2fz + p cosα
c
where D and D are the inner or outer diameter respectively at the point under consideration.
i e
Equation (6.4.4-3) shall read as follows:
For a given geometry:
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
2 f ze cosα
con
P = (6.4.4-3)
max
D
m
where D is the mean diameter at the point under consideration.
m
Equation (6.4.4-7) shall read as follows:
where
(6.4.4-7)
D= De− −2r (1−cosα ) −l sinα
K c 1 2
i
For r see Figure 6.4.2-2.
i
17 Modification to 6.4.6.2
The revised Figure 6.4.6-1 shall read as follows:

Figure 6.4.6-1 — Values of coefficient β for cone/cylinder intersection without knuckle

SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
18 Modification to 6.4.6.3
In indent a), Equation (6.4.6-3) shall read as follows:
a) apply equation (6.4.6-3) to cylinder;
2 f ze
a
P = (6.4.6-3)
max
D
c
19 Modification to 6.4.7.3
In indent f), Equation (6.4.7-5) shall read as follows:
2feγ
j
P = (6.4.7-5)
max
β D
c
20 Modification to 6.4.8.3
Equation (6.4.8-6) shall read as follows:
2 f ze
1a
(6.4.8-6)
P =
max
D β
cH
21 Modification to 6.6.1
The second paragraph of clause 6.6.1 shall read as follows:
If there is a specific requirement on tightness for the flange connection, this shall be calculated in
accordance with EN 1591-1 and EN 1591-2. Recommended gaskets are specified in Annex P.
The second sentence of the fourth paragraph of clause 6.6.1 shall read as follows:
The selection of bolting shall comply with Annex D and EN 1515-4.
At the end of clause 6.6.1, add a fifth paragraph as follows:
Annex P gives information on gasket limitation (pressure, temperature, chemical compatibility, etc.).
22 Modification to 6.6.2
The revised Table 6.6.2-1 shall read as follows:
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
Table 6.6.2-1 — Additional symbols for the purposes of 6.6
Symbol Description Unit
P Equivalent design pressure MPa (N/mm )
eq
P Internal calculation pressure MPa (N/mm )
F Pulling axial force (to be a positive value in equation) N
M External bending moment N mm
G Diameter of gasket load reaction mm
C Diameter of bolt circle mm
23 Modification to 6.6.3
In indent b), the Equation (6.6.2-1) shall read as follows:
16 M
4F
PP=+ + (6.6.2-1)
eq
2 2
ππG CG
Below the Equation (6.6.2-1), delete the following sentence:
Where:
G is the diameter of circle on which applies the compression load of the gasket (normally the mean
diameter of the gasket).
24 Modification to 6.6.4
The first paragraph of clause 6.6.4 shall read as follows:
If a non-standard flange is used, the design shall be done by applying the calculation method in
EN 1591-1, or by applying the algorithm shown in the Taylor-Forge method (Annex D).
25 Modification to 7.1.2
The revised Figure 7.1.2-1 (a) shall read as follows:

a) External chamfer                     b) Internal chamfer
Figure 7.1.2-1 — Hemispherical ends
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
26 Modification to 7.2.3.2
In sub-clause 7.2.3.2, Equation (7.2.3-4) shall read as follows:
2 4
   
2De+ e
e
( )
3 f D p i eq eq
eq
1 i c
   
(7.2.3-4)
B =1− + −
pf  16   4
De+ D + e
c1( ) ( )
i eq i eq De+
( )
    i eq
The revised Figure 7.2.3-2 shall read as as follows:

Figure 7.2.3-2 — Factor C1
The NOTE below the Figure 7.2.3-2 shall read as follows:
NOTE Where the line for a constant, given p /f does not intersect the relevant curve for constant
c 1
e /D , C is given by the bottom curve for the given p /f .
eq i 1 c 1
27 Modification to 7.2.3.3
The revised Figure 7.2.3-4 shall read as follows:

SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
Figure 7.2.3-4 — Coefficient C2
28 Modification to 7.2.4.3
Replace the existing Table 7.2.4-1 with the following:
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
Table 7.2.4-1 — Recommended gasket factors (m) and minimum design seating stress (y)
Gasket material Gasket Minimum Sketches
factor design
seating
stress
m y
N/mm
Rubber without fabric or a high percentage of
a
asbestos fibre:
0,50 0
b
below 75°BS and IRH 1,00 1,4
75° BS and IRH or higher
Rubber with cotton fabric insertion 1,25 2,8

Non-asbestos fibre based sheet gasket
• Thickness: 2mm 2,3 40
• Thickness: 3mm 2,4 20
d
PTFE based sheet gasket
• Thickness: 2mm 1,6 15
• Thickness: 3mm 1,4 10
Graphite based sheet gasket 1,5 20

Spiral-wound metal
(external and internal ring)
Standard with graphite 2,5 60
d
filler
2,4 60
Standard with PTFE filler
1,2 20
Low stress with graphite
filler
d
Grooved metal gasket Graphite facing 2,5 60

d
Covered metal jacketed Graphite facing 2,9 20

Corrugated metal, or Soft aluminium 2,50 20,0
corrugated metal jacketed Soft copper or brass 2,75 25,5
Iron or soft steel 3,00 31,0
Monel or (4 to 6) % 3,25 37,9
chromium alloy steel
Stainless steels
3,50 44,8
Flat metal jacketed Soft aluminium 3,25 37,9
Soft copper or brass 3,5 44,8
Iron or soft steel 3,75 52,4
Monel 3,5 55,1
(4 to 6) % chromium alloy 3,75 62,0
steel 3,75 62
Stainless steels
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
Gasket material Gasket Minimum Sketches
factor design
seating
stress
m y
N/mm
Corrugated metal Soft aluminium 2,75 25,5

Soft copper or brass 3,00 31,0
Iron or soft steel 3,25 37,9
Monel or (4 to 6) % 3,5 44,8
chromium alloy steel
Stainless steels
3,75 52,4
Grooved metal Soft aluminium 3,25 37,9

Soft copper or brass 3,5 44,8
Iron or soft steel 3,75 52,4
Monel or 4 to 6 % 3,75 62
chromium alloy steel
Stainless steels
4,25 69,5
Solid flat metal Soft aluminium 4,00 60,6

Soft copper or brass 4,75 89,5
Iron or soft steel 5,5 124
Monel or (4 to 6) % 6,0 150
chromium alloy steel
Stainless steels
6,5 179
Ring joint Iron or soft steel 5,50 124
Monel or (4 to 6) % 6,00 150
chromium
6,50 179
Stainless steels
Rubber O-rings :
below 75° BS 0 to 0,25 0,7
75° BS and 85° BS and higher 1,4
Rubber square section rings :
below 75° BS and IRH 0 to 0,25 1,0
c
75° BS and 85° BS and IRH 2,8
Rubber T-section rings :
below 75° BS and IRH 0 to 0,25 1,0
75° and 85° BS and IRH 2,8
NOTE 1 In selecting gasket materials for use with aluminium alloy flanges account should be taken of
the relative hardness values of the gasket and flange materials.
a
New non-asbestos bonded fibre sheet gaskets are not necessarily direct substitutes for asbestos based
materials. In particular pressure, temperature and bolt load limitations may be applied. Use within the
manufacturer's current recommendations.
b
See BS 903-A26.
c
This value has been calculated.
d
This values are given as an indication. These values are issued from representative joints test
performed in standard tightness conditions and are valid for operating conditions at room temperature.
For high temperature conditions, it should ensure to check that the maximum allowable stress for the
gasket is not exceeded.
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
29 Modification to 7.2.5.2
Equation (7.2.5-5) shall read as follows:
d is the equivalent diameter given by:
— in case of set-on nozzles
2 A
r
dd− (7.2.5-5)
i
e
op
After Equation (7.2.5-6), the following sentence shall be added:
If d < 0 results from Equation (7.2.5-5) or (7.2.5-6) it shall not be used.
After Figures 7.2.5-3 and 7.2.5-4, add the new Equation (7.2.5-7) as follows:
The reinforcing length l shall be defined as follows:
l 0,5 d+ de (7.2.5-7)
( )
o i rb
30 Modification to 8.3.1
In 8.3.1, before the first paragraph, add the following sentence:
These limitations are not applicable for design according to 8.6.
31 Modification to 8.3.2
In 8.3.2 b), the Equation (8.3.2-4) shall be read as follows:
— for the small end

De
ms as

xe≥ max ; 3,0 (8.3.2-4)
s as

cosα

32 Modification to 8.3.9
In 8.3, add a new sub-clause 8.3.9 and change the numbering of the subsequent sub-clauses. The current
8.3.9 "Branches in bends or elbows" becomes 8.3.10, the current 8.3.10 "Screwed-in branches" becomes
8.3.11 and the current Figure 8.3.10-1 "Screwed-in branches" becomes Figure 8.3.11-1.
8.3.9 Forged welded in tee
The restrictions of 8.3.8 are not valid for forged tees, provided that the assumed wall thickness at the
intersection can be guaranteed, see Figures 8.3.9-1 and 8.3.9-2.
=
=
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
Figure 8.3.9-1 — Forged Tee from solid material

Figure 8.3.9-2 — Die forged Tee
33 Modification to 8.4.4
After the first sentence of the sub-clause 8.4.4, add a second sentence as follows:
This limitation shall not apply to forged Tees from solid material (Figure 8.3.9-1) and die forged Tees
(Figure 8.3.9-2).
34 Modification to 8.6.1
In sub-clause 8.6.1, delete the following NOTE:
NOTE It is recommended, that such a design should not apply in the creep range. Attention should be paid to
the welding process.
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
35 Modification to 8.6.3
In sub-clause 8.6.3, the Equations (8.6.3-2) and (8.6.3-3) shall read as follows:
d
branch
i
WR= 2 e 1-0,7 sinα (8.6.3-2)
( )
pt0,2 as
D
i
re inf 2
e 3,7 Rb
( )
rf pt0,2 j
W = (8.6.3-3)
j
4 bx+ 3
jj
In sub-clause 8.6.3, below the Equation (8.6.3-3), in the key before b add the following elements:
j
where
re inf
R yield strength of external reinforcement at calculation temperature ;
pt0,2
branch
R yield strength of branch at calculation temperature ;
pt0,2
36 Modification to 10.2
rd
The 3 indent of the indent e) of 10.2 shall read as follows:
3) the thickness does not exceed 125 mm for ferritic steels and 60 mm for austenitic steels and the
number of equivalent full load cycles at temperature is less than 7 000;
37 Modification to 10.3.1
In sub-clause 10.3.1, below the key of Equation (10.3.1-1), add the following sentence:

For Equation (10.3.1-1), p may be replaced by P for analysis of each component.
c max
38 Modification to 10.3.2.2
In Table 10.3.2-1, the line related to p for notional pressure shall be deleted.
r
∧ ∨
 
 
In Table 10.3.2-1, the line related to p− p shall be corrected as follows:
 
 
∧ ∨
 
 
p− p
pressure fluctuation range (double amplitude) MPa (N/mm²)
 
 
39 Modification to 10.3.2.3
Equation (10.3.2-1) shall read as follows:

pp−
η ( )
∗
2σ = f (10.3.2-1)
a 20
FF P
∗
d max
t
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
After Equation (10.3.2-1), the paragraph shall read as follows:
The pressure P shall be determined as allowable pressure with full utilisation of the nominal design
max
stress f for a piping component from the dimensional equations in clauses 6 to 9 and 11, rearranged
to give p.
40 Modification to 10.5
The first sentence of 10.5 shall read as follows:
Where a fatigue analysis for thermal loads in combination with pressure load is required, the method in
EN 12952-3 may be used.
41 Modification to 12.1.3.2
Below the Equation 12.1.3-1, E shall be completed as follows:
c
E is the value of the modulus of elasticity at the minimum metal temperature consistent with the
c
loading under consideration. In cases where operation conditions with temperatures below assembly
temperature exist, E may be taken as the modulus of elasticity at assembly temperature;
c
42 Modification to 12.2.2
Add this sentence at the end of sub-clause 12.2.2 as follows:
The variation in supporting effort of spring hangers and spring supports should not exceed 25%, unless
otherwise justified by an analysis of the piping according to Clause 12.
43 Modification to 12.2.10.3
The end of the paragraph 12.2.10.3 shall read as follows:
12.2.10.3.9 In case of abnormal conditions, it is the responsibility of the piping designer to request the
necessary additional travel reserve in spring and constant support and hanger.
12.2.10.3.10 The rigidities of expansion joints shall be considered as internal rigidities (stiffness
matrices included directly).
NOTE Acoustic fatigue can occur in a piping system particularly when the natural frequency of the system
matches the source frequency. This problem is not addressed in this clause, and specialist advice should be sought
where it is considered that it can occur.
44 Modification to 12.3.1
At the end of the sub-clause 12.3.1, the following paragraph shall be added:
If considerable corrosion/erosion is expected, it should be taken into account in the flexibility analysis
as follows. In the equations (12.3.2‐1), (12.3.3‐1), (12.3.4‐1), (12.3.4‐2), (12.3.5‐1), and (12.3.6‐1) for
stress calculation, for second moment of area, sectional modulus and stress intensification factor, a wall
thickness (e – c ) should be used to ensure the design stress criteria are met. If necessary, two
n 0
calculations with e as well as with (e – c ) should be carried out. For the calculation of support loads
n n 0
and reactions (see 12.3.9) the nominal wall thickness should be considered.
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
45 Modification to 12.3.2
At the end of the sub-clause 12.3.2, the following paragraph shall be added:
For the consideration of pressure test loads in Equation (12.3.2‐1) the calculation pressure p should be
c
replaced by the test pressure p (see EN 13480‐5). In addition, the design stress f should be replaced
f
test
by a value of 95% R at test temperature.
eH
46 Modification to 12.3.4
Below the Equation (12.3.4-2), the following paragraph shall read as follows:
MC is the range of the resultant moment due to thermal expansion and alternating loads which shall be
determined from the greatest difference between moments using the modulus of elasticity at the
relevant temperatures. The greatest difference of moments shall be obtained from that combination of
servie conditions described in section 4.2.5.1 which lead to the greatest value for MC. Thereby, the zero
state condition shall also be taken into account.
47 Modification to 12.3.6
In sub-clause 12.3.6, the Equation (12.3.6-1) shall read as follows:
iM
D
σ ≤ min ( 2RR; ) (12.3.6-1)
6 p0,2 t m
Z
48 Modification to 12.3.8
Add a new sub-clause 12.3.8 as follows and renumber the current sub-clause 12.3.8 "Reactions" as sub-
clause 12.3.9:
12.3.8 Alternative method for stress calculation
In the Equations 12.3.2-1, 12.3.3-1, 12.3.4-1, 12.3.4-2, 12.3.5-1 and 12.3.6-1, the stresses determined
with the resultant moment (Equation 12.3.7-2 or 12.3.7-4) can be also calculated with the following
Equation:
2 22
(iM ) +(i M ) + M
ii 0 0 t
σ = (12.3.8-1)
Z
where
M is the in plane bending moment
i
M is the out plane bending moment
o
M is the torsional moment
t
i is the in plane stress intensification factor (Annex H)
i
i is the out plane stress intensification factor (Annex H)
o
Z is the section modulus of the element
=
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
49 Modification to Clause 13
Replace the existing Clause 13 with the following:
13 Pipe Supports
13.1 General requirements
13.1.1 General
Clause 13 specifies the requirements for supporting and controlling the movement of piping systems
subject to the requirements of EN 13480. Clause 13 is organized into logical sequence to help the user:
general remarks, selection of pipe support and manufacturing of pipe supports.
NOTE See also Annex I, Annex J, Annex K, Annex L, Annex M and Annex N.
It does not cover the main structures to which supports are attached, nor service conditions such as
corrosion and erosion effects.
Supports are divided into three categories:
— rigid supports;
— movable supports;
— intermediate (secondary) steel.
Supporting elements are those devices which connect the piping to the surrounding structure. They
shall:
— carry the weight of the piping as well as that of any equipment integral with the piping;
— control the movement of the piping;
— direct and transfer static (or dynamic if they occur) loadings from the pipe to the surrounding
structure.
13.1.2 Classification of supports
Supports shall be classified according to three levels, given in Table 13.1.2-1, depending upon the
category of the piping according to the PED.
Table 13.1.2-1 — Classification of support
Category according to Class of support
PED
III S 3
II S 2
a
I / no S 1
a
Including Sound Engineering Practice of a Member
State according to PED, Article 3.3.
Where equipment of different categories according to the PED have a common support, the level of the
support shall conform to the requirements of the most stringent support class.
SIST EN 13480-3:2012/oprA1:2016
EN 13480-3:2012/prA1:2016 (E)
NOTE For harmonization of fabrication, some supports may be supplied to a higher class than that required
by the piping class.
13.1.3 Additional definitions
For the purposes of Clause 13, the following definitions apply in addition to those given in 3.1:
13.1.3.1
anchor
fixed point
rigid device used to prevent or limit all relative pipe rotation and displacement at the point of
application, under the specified design conditions of temperature and loading
13.1.3.2
line stop
device to restrain axial displacement of the piping
13.1.3.3
guide
device which permits pipe movement in a pre-de
...