EN 13480-8:2024

SLOVENSKI STANDARD
01-december-2024
Nadomešča:
SIST EN 13480-8:2018
Kovinski industrijski cevovodi - 8. del: Dodatne zahteve za cevovode iz aluminija
in aluminijevih zlitin
Metallic industrial piping - Part 8: Additional requirements for aluminium and aluminium
alloy piping
Metallische industrielle Rohrleitungen - Teil 8: Zusatzanforderungen an Rohrleitungen
aus Aluminium und Aluminiumlegierungen
Tuyauteries industrielles métalliques - Partie 8: Exigences complémentaires relatives
aux tuyauteries en aluminium et alliages d'aluminium
Ta slovenski standard je istoveten z: EN 13480-8:2024
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
77.150.10 Aluminijski izdelki Aluminium products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 13480-8
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 23.040.01 Supersedes EN 13480-8:2017
English Version
Metallic industrial piping - Part 8: Additional requirements
for aluminium and aluminium alloy piping
Tuyauteries industrielles métalliques - Partie 8: Metallische industrielle Rohrleitungen - Teil 8:
Exigences complémentaires relatives aux tuyauteries Zusatzanforderungen an Rohrleitungen aus Aluminium
en aluminium et alliages d'aluminium und Aluminiumlegierungen
This European Standard was approved by CEN on 9 July 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a 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 European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13480-8:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and units . 8
4 General requirements . 8
5 Materials . 8
5.1 General . 8
5.2 Material grouping system . 9
5.3 Elongation after fracture . 9
5.4 Chemical composition . 10
5.5 Lamellar tearing . 10
5.6 Design temperature and properties. 10
5.7 Prevention of brittle fracture . 10
5.8 Specific requirements for fasteners made of aluminium and aluminium alloys . 11
5.9 Lined piping . 11
5.10 Clad products . 11
5.11 Technical delivery conditions for welding consumables . 11
6 Design . 11
6.1 General . 11
6.2 Time-independent nominal design stress . 11
6.3 Straight pipes . 12
6.4 Pipe bends and elbows . 12
6.5 Mitre bends. 12
6.6 Socket welds . 13
6.7 Designing with transition joints . 14
6.7.1 Design considerations . 14
6.7.2 Location of transition joints . 14
6.7.3 Requirements for transition joints . 14
6.8 Port-hole extruded tubes . 14
6.9 Alternative methods . 14
7 Fabrication and installation . 14
7.1 General . 14
7.2 Material grouping . 15
7.3 Tolerances . 15
7.3.1 Welded pipes and connection dimensions of pipe fittings . 15
7.3.2 Welded piping construction . 15
7.4 Cutting and bevelling . 15
7.5 Bending and other forming . 16
7.5.1 General . 16
7.5.2 Definition of cold- and hot forming . 16
7.5.3 Heat treatment after cold forming . 16
7.5.4 Heat treatment after hot forming . 17
7.6 Welding . 18
7.6.1 Welding personnel . 18
7.6.2 Welding processes . 18
7.6.3 Weld joint preparation . 18
7.6.4 Preheating . 19
7.6.5 Backing rings and backing strips . 20
7.6.6 Post-weld heat treatment (PWHT) . 20
8 Inspection and testing . 20
8.1 General . 20
8.2 Formed pressure retaining parts . 20
8.2.1 General . 20
8.2.2 Testing of formed parts . 21
8.2.3 Destructive testing of formed and heat treated parts . 21
8.3 Welding . 22
8.4 Visual and non-destructive testing of welds . 22
8.4.1 Application of NDT . 22
8.4.2 Circumferential, branch, socket and seal welds . 22
8.4.3 Longitudinal welds and spiral welded tubes/pipes . 22
8.5 VT and NDT Methods . 23
8.6 Production test plates for welded pipes . 24
9 Final assessment and documentation . 25
9.1 General . 25
9.2 Pneumatic pressure test . 25
9.3 Documentation for components . 25
Annex A (informative) Dimensional tolerances . 27
Annex B (normative) Transition joints . 29
Annex C (normative) Nominal design stress values . 36
Annex Y (informative) History of EN 13480-8 . 43
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU aimed to be covered . 44
Bibliography . 46

European foreword
This document (EN 13480-8:2024) 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 December 2024, and conflicting national standards shall be withdrawn
at the latest by December 2024.
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 supersedes EN 13480-8:2017.
This new edition incorporates the Amendments/the corrigenda which have been approved previously by CEN
members, and the corrected pages up to Issue 2 without any further technical change. Annex Y provides details
of significant technical changes between this European Standard and the previous edition.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this document.
This European Standard EN 13480 for metallic industrial piping consists of eight interdependent and not
dissociable Parts which are:
 Part 1: General;
 Part 2: Materials;
 Part 3: Design and calculation;
 Part 4: Fabrication and installation;
 Part 5: Inspection and testing;
 Part 6: Additional requirements for buried piping;
 CEN/TR 13480-7, Guidance on the use of conformity assessment procedures;
 Part 8: Additional requirements for aluminium and aluminium alloy piping.
Although these Parts may be obtained separately, it should be recognized that the Parts are inter-dependant.
As such the manufacture of metallic industrial piping requires the application of all the relevant Parts in order
for the requirements of the Standard to be satisfactorily fulfilled.
This European Standard will be maintained by a Maintenance MHD working group whose scope of working is
limited to corrections and interpretations related to EN 13480. The contact to submit queries can be found at
https://unm.fr/en/maintenance-agencies/maintenance-agency-en-13480/.
A form for submitting questions can be downloaded from the link to the MHD website. After subject experts
have agreed an answer, the answer will be communicated to the questioner. Interpretation sheets will be
posted on the website of the MHD.
Amendments to this new edition may be issued from time to time and then used immediately as alternatives
to rules contained herein. These amendments will be consolidated within EN 13480:2024 in accordance with
the maintenance system of EN 13480 series approved by CEN/BT Decision C172/2021.
Any feedback and questions on this document should be directed to the users’ national standards body. A
complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia,
Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United Kingdom.
1 Scope
This document specifies requirements for industrial piping systems made of aluminium and aluminium alloys
in addition to the general requirements for industrial piping according to the series of standards
EN 13480:2024 and CEN/TR 13480-7:2017. It specifies requirements for wrought products only.
NOTE Castings is not covered in this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 485-2:2016+A1:2018, Aluminium and aluminium alloys — Sheet, strip and plate — Part 2: Mechanical
properties
EN 485-3:2003, Aluminium and aluminium alloys — Sheet, strip and plate — Part 3: Tolerances on dimensions
and form for hot-rolled products
EN 485-4:1993, Aluminium and aluminium alloys — Sheet, strip and plate — Part 4: Tolerances on shape and
dimensions for cold-rolled products
EN 573-3:2019+A1:2022, Aluminium and aluminium alloys — Chemical composition and form of wrought
products — Part 3: Chemical composition and form of products
EN 586-2:1994, Aluminium and aluminium alloys — Forgings — Part 2: Mechanical properties and additional
property requirements
EN 754:2016 (all parts), Aluminium and aluminium alloys — Cold drawn rod/bar and tube
EN 755:2016 (all parts), Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles
EN 764-1:2015+A1:2016, Pressure equipment — Part 1: Vocabulary
EN 764-5:2002, Pressure equipment — Part 5: Inspection documentation of metallic materials and compliance
with the material specification
EN 1779:1999, Non-destructive testing — Leak testing — Criteria for method and technique selection
EN 10204:2004, Metallic products — Types of inspection documents
EN 12392:2016+A1:2022, Aluminium and aluminium alloys — Wrought products and cast products — Special
requirements for products intended for the production of pressure equipment
EN 13445-4:2021, Unfired pressure vessels — Part 4: Fabrication
EN 13480-1:2024, Metallic industrial piping — Part 1: General
EN 13480-2:2024, Metallic industrial piping — Part 2: Materials
EN 13480-3:2024, Metallic industrial piping — Part 3: Design and calculation
EN 13480-4:2024, Metallic industrial piping — Part 4: Fabrication and installation

As impacted by EN 1779:1999/A1:2003.
EN 13480-5:2024, Metallic industrial piping — Part 5: Inspection and testing
EN ISO 148-1:2016, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1:2016)
EN ISO 3452-1:2021, Non-destructive testing — Penetrant testing — Part 1: General principles
(ISO 3452-1:2021)
EN ISO 3834-2:2021, Quality requirements for fusion welding of metallic materials — Part 2: Comprehensive
quality requirements (ISO 3834-2:2021)
EN ISO 3834-3:2021, Quality requirements for fusion welding of metallic materials — Part 3: Standard quality
requirements (ISO 3834-3:2021)
EN ISO 4063:2010, Welding and allied processes — Nomenclature of processes and reference numbers
(ISO 4063:2009, Corrected version 2010-03-01)
EN ISO 4136:2022, Destructive tests on welds in metallic materials — Transverse tensile test (ISO 4136:2022)
EN ISO 5173:2010, Destructive tests on welds in metallic materials — Bend tests
(ISO 5173:2009)
EN ISO 6892-1:2019, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1:2019)
EN ISO 6892-2:2018, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature (ISO
6892-2:2018)
EN ISO 7438:2020, Metallic materials — Bend test (ISO 7438:2020)
EN ISO 9606-2:2004, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium alloys
(ISO 9606-2:2004)
EN ISO 10042:2018, Welding — Arc-welded joints in aluminium and its alloys — Quality levels for imperfections
(ISO 10042:2018)
EN ISO 10893-8:2011, Non-destructive testing of steel tubes — Part 8: Automated ultrasonic testing of seamless
and welded steel tubes for the detection of laminar imperfections (ISO 10893-8:2011)
EN ISO 10893-11:2011, Non-destructive testing of steel tubes — Part 11: Automated ultrasonic testing of the
weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections
(ISO 10893-11:2011)
EN ISO 11666:2018, Non-destructive testing of welds — Ultrasonic testing — Acceptance levels
(ISO 11666:2018)
EN ISO 15614-2:2005, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 2: Arc welding of aluminium and its alloys (ISO 15614-2:2005)
EN ISO 16810:2014, Non-destructive testing — Ultrasonic testing — General principles (ISO 16810:2012)
EN ISO 16811:2014, Non-destructive testing — Ultrasonic testing — Sensitivity and range setting
(ISO 16811:2012)
As impacted by EN ISO 5173:2010/A1:2011.
As impacted by EN ISO 10893-8:2011/A1:2020.
As impacted by EN ISO 10893-11:2011/A1:2020.
EN ISO 16823:2014, Non-destructive testing — Ultrasonic testing — Transmission technique (ISO 16823:2012)
EN ISO 16826:2014, Non-destructive testing — Ultrasonic testing — Examination for discontinuities
perpendicular to the surface (ISO 16826:2012)
EN ISO 16827:2014, Non-destructive testing — Ultrasonic testing — Characterization and sizing of
discontinuities (ISO 16827:2012)
EN ISO 16828:2014, Non-destructive testing — Ultrasonic testing — Time-of-flight diffraction technique as a
method for detection and sizing of discontinuities (ISO 16828:2012)
EN ISO 17636-1:2022, Non-destructive testing of welds — Radiographic testing — Part 1: X- and gamma-ray
techniques with film (ISO 17636-1:2022)
EN ISO 17636-2:2013, Non-destructive testing of welds — Radiographic testing — Part 2: X- and gamma-ray
techniques with digital detectors (ISO 17636-2:2013)
EN ISO 17637:2016, Non-destructive testing of welds — Visual testing of fusion-welded joints (ISO 17637:2016)
EN ISO 17639:2022, Destructive tests on welds in metallic materials — Macroscopic and microscopic
examination of welds (ISO 17639:2022)
EN ISO 17640:2018, Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and
assessment (ISO 17640:2018)
EN ISO 23277:2015, Non-destructive testing of welds — Penetrant testing — Acceptance levels
(ISO 23277:2015)
CEN ISO/TR 15608:2017, Welding — Guidelines for a metallic materials grouping system (ISO/TR 15608:2017)
ISO/TR 25901-1:2016, Welding and allied processes — Vocabulary — Part 1: General terms
ISO/TR 25901-3:2016, Welding and allied processes — Vocabulary — Part 3: Welding processes
ISO/TR 25901-4:2016, Welding and allied processes — Vocabulary — Part 4: Arc welding
3 Terms, definitions, symbols and units
For the purposes of this document, the terms, definitions, symbols and units of EN 13480-1:2024,
EN 13480-2:2024, EN 13480-3:2024, EN 13480-4:2024 and EN 13480-5:2024 apply.
4 General requirements
The general requirements of EN 13480-1:2024 shall apply.
5 Materials
5.1 General
Materials for pressure-bearing parts compliant with the requirements of this European Standard shall be
accompanied by inspection documents in accordance with EN 10204:2004.
The type of inspection document shall be in accordance with EN 764-5:2002 and include a declaration of
compliance to the material specification.
The requirements of EN 13480-2:2024 shall apply with the following additions/exclusions:
5.2 Material grouping system
Annex A of EN 13480-2:2024 is not applicable for aluminium and aluminium alloys. The allowable materials
for industrial piping of aluminium and aluminium alloys shall be according to Table 5.2-1.
Any product form available in the EN standards referenced in Annex C for a material and temper listed in
Table 5.2-1 is acceptable for construction to this European Standard. Other materials not specified here can
be used by agreement (see EN 13480-2:2024, 4.3) if they meet the requirements of 5.2 and 5.3 of this standard
and a Particular Material Appraisal is produced (see EN 764-4:2002).
Table 5.2-1 — Grouping system based on CEN ISO/TR 15608:2017 and
EN AW numbers according to EN 573-3:2019+A1:2022
Designation
Sub Type of aluminium and
Group
group aluminium alloys
EN AW number Chemical symbol Temper
21 Pure aluminium with ≤ 1 % EN AW – 1050A EN AW–Al 99,5 O, H111, H112
impurities or alloy content
EN AW – 1070A EN AW–Al 99,7 O, H111, H112
EN AW – 1080A EN AW–Al 99,8(A) O, H111, H112
22 Non heat treatable alloys
22.1 Aluminium-manganese alloys EN AW – 3003 EN AW–Al Mn1Cu O, H111, H112
EN AW – 3103 EN AW–Al Mn1 O, H111, H112
EN AW – 3105 EN AW–Al O, H111
Mn0,5Mg0,5
22.2 Aluminium-magnesium alloys with EN AW – 5005 EN AW–Al Mg1(B) O, H111, H112
Mg ≤ 1,5 %
EN AW – 5005A EN AW–Al Mg1(C) O, H111, H112
EN AW – 5050 EN AW–Al Mg1,5 (C) O, H111
22.3 Aluminium-magnesium alloys with EN AW – 5049 EN AW–Al Mg2Mn0,8 O, H111, H112
1,5 % < Mg ≤ 3,5 %
EN AW – 5052 EN AW–Al Mg2,5 O, H111, H112
EN AW – 5154A EN AW–Al Mg3,5(A) O, H111, H112
EN AW – 5251 EN AW–Al Mg2 O, H111, H112
EN AW – 5454 EN AW–Al Mg3Mn(A) O, H111, H112
EN AW – 5754 EN AW–Al Mg3 O, H111, H112
22.4 Aluminium-magnesium alloys with EN AW – 5083 EN AW–Al O, H111, H112
Mg > 3,5 % Mg4,5Mn0,7
EN AW – 5086 O, H111
EN AW–Al Mg4
23 Heat treatable alloys
23.1 Aluminium-magnesium-silicon EN AW 6060 EN AW–Al MgSi a
T4
alloys
EN AW 6061 EN AW–Al Mg1SiCu
b c
T4 , T6
a
for seamless pipes and profiles only
b
for seamless pipes and flanges only
c
for flanges only
5.3 Elongation after fracture
Aluminium and aluminium alloys used for parts of industrial piping that are subjected to cold forming shall
have a specified minimum elongation after fracture measured on a gauge length
L = 5,65 S (5.3-1)
o o
that is ≥ 14 % in the longitudinal or transverse direction as specified by the material specification.
Aluminium and aluminium alloys used for parts of industrial piping that are not subjected to cold forming (e.g.
straight flanges and nozzles) shall have a specified minimum elongation after fracture of ≥ 10 % in the
longitudinal or transverse direction as specified by the material specification measured on a gauge length as
defined in equation (5.3-1).
5.4 Chemical composition
The chemical composition shall be in accordance with the material specification.
NOTE EN 12392:2016+A1:2022, 5.1.3 recommends a maximum hydrogen level of 0,2 ml per 100 g aluminium,
measured in the liquid metal during casting for parts to be welded. EN 12392:2016+A1:2022, 4.1, recommends a
maximum lead content not exceeding 150 μg/g.
5.5 Lamellar tearing
Specific requirements to avoid lamellar tearing for industrial piping of aluminium and aluminium alloys are
not applicable.
NOTE Specific requirements apply to steel (see EN 1011-2:2001) whereas in EN 1011-4:2000 no requirement is
given because lamellar tearing is not a recognized phenomenon.
5.6 Design temperature and properties
NOTE 1 See also EN 13480-2:2024, 4.2.2.
nd
EN 13480-2:2024, 4.2.2.1, 2 paragraph is not applicable for aluminium and aluminium alloys.
Nominal design stress values are given in Table C.1, Table C.2, Table C.3 and Table C.4. Design temperatures
that exceed the respective temperature limit in Annex C are not permitted.
For materials of group 22.4 temperatures above 80 °C can result in grain boundary precipitation of Al -Mg .
3 2
These materials can be used at temperatures above 80 °C up to 200 °C only for non-corrosive service.
NOTE 2 For further material properties, see EN 12392:2016+A1:2022.
For welded parts and heat treated parts after forming only the values equivalent to the O temper shall be used
for design when 6 000 series flanges, etc. are welded. Nominal design stresses are given in C.6. The weld area
shall be based on the O temper but the flange strength away from the weld (2t) can be based on the actual
temper (T4 or T6).
For aluminium and aluminium alloys values of 0,2 % proof strength (or 1 % proof strength for material group
21-1 000 series aluminium) for temperatures above 20 °C shall be established by linear interpolation between
two adjacent values according to EN 12392:2016+A1:2022, Clause 8.
For material of group 22.4: For short periods, higher temperatures are permitted (e.g. when defrosting
refrigerating plant) up to 150 °C are permissible provided that the pressure is reduced to half the working
pressure for a period up to 8 h and to atmospheric pressure for a period up to 24 h.
5.7 Prevention of brittle fracture
EN 13480-2:2024, Annex B is not applicable. All materials of Table 5.2-1 are suitable for any minimum metal
temperature without impact testing.
NOTE See also EN 1252-1:1998 and EN 12392:2016+A1:2022, 8.4.
5.8 Specific requirements for fasteners made of aluminium and aluminium alloys
Threads of bolts and studs shall be rolled. Regarding prevention of brittle fracture for materials of fasteners
5.7 applies.
NOTE 1 Other manufacturing techniques can be agreed by the parties involved. In this case, special considerations
regarding the application and testing requirements can be necessary. Such requirements are not addressed by this
standard.
NOTE 2 Materials other than aluminium and aluminium alloys can be used for bolting for piping constructions
according to this European Standard. The designer should give special consideration to these different bolting materials.
5.9 Lined piping
Specific requirements for lined piping are not applicable for aluminium and aluminium alloys.
5.10 Clad products
Specific requirements for clad products are not applicable for aluminium and aluminium alloys.
5.11 Technical delivery conditions for welding consumables
The requirements of EN 13480-2:2024, 4.3.5 shall apply.
6 Design
6.1 General
The requirements of EN 13480-3:2024 shall apply with the following additions/exclusions.
6.2 Time-independent nominal design stress
The design stresses for aluminium and aluminium alloys materials shall be in accordance with the
Table 6.2-1.
Table 6.2-1 — Design stresses for aluminium and aluminium alloy material
Group according to Design stresses at test
Design stresses at design condition
Table 5.2-1 condition
21 f = [R / 1.5] f = [R / 1.05]
p1,0,t test p1,0,20
22 f = min ([R / 1.5] or [R / 2.4]) f = [R / 1.05]
p0,2,t m,20 test p0,2, 20
23 f = min ([R / 1.5] or [R / 3]) f = [R / 1.05]
p0,2,t m,20 test p0,2, 20
Table 6.2-2 — Allowable design strength values for 6 000 series aluminium alloys
in the welded condition (see 5.6)
Material Value of f for design temperature (°C)
designation not exceeding
a a
50 75 100 125 150 175
EN AW 6060 40 40 40 38 - -
EN AW 6061 55 55 55 54 51 43
NOTE Data are derived from EN 13445-8:2021.
a
For maximum design temperature see 5.6. Values for 125 °C
(EN AW 6060) and 175 °C (EN AW 6061) shall be used for
interpolation only.
6.3 Straight pipes
In general, straight pipes shall be designed in accordance with EN 13480-3:2024, 6.1.
For D /D > 1,2, Formula (6.3-1) can be used. In this case pipes shall be seamless or tested in accordance with
0 i
8.4.3 and 8.6 for z = 1,0 and the maximum allowable pressure p shall be determined as follows:
a
 
D 
2 1
 
p = xR x ln x (6.3-1)
 
a p0,2,t
 
D 1,5
 i 
 
 
For material group 21 R shall be used instead of R .
p1,0,t p0,2,t
6.4 Pipe bends and elbows
The standard method for calculation of bends and elbows for aluminium and aluminium alloys shall be the
method described in EN 13480-3:2024, B.4.1.3.
NOTE 1 This clause should not be understood as to prohibit the other methods given in EN 13480-3:2024, but to
reflect the actual situation at the bend manufacturers.
NOTE 2 Also see 6.2.3 and EN 13480-3:2024, Formula B.4.1-11.
6.5 Mitre bends
EN 13480-3:2024, 6.3 can be used for the design of mitre bends for aluminium and aluminium alloys.
Alternatively the method described in Formulae (6.5-1) to (6.5-4) can also be used for multiple mitre bends
for aluminium and aluminium alloys according to Figure 6.5-1 with a maximum angle Θ of 22,5°. The pressure
limit given in EN 13480-3:2024, 6.3.1 is not applicable for this method.
NOTE 1 Current experiences are available up to pressures of 63 bar for time independent design stresses, however
this does not prohibit the calculation of mitre bends to the given formula for use of higher pressures, but shows the
reference pressure for which mitre bends made of aluminium and aluminium alloys and designed to the rules are in safe
operation.
NOTE 2 Source: FDBR Guideline, Design of power piping, July 1995.
The following symbols apply for the alternative method in addition to those mentioned in Clause 3.
Table 6.5-1 — Special symbols for subclause 6.5
Symbol Description Unit
σ Equivalent stress intensity MPa (N/mm )
v
a 2
pa Maximum allowable pressure MPa (N/mm )
d Design inside diameter mm
iv
a a
See footnote in EN 13480-3:2024, Table 3.2-1.

 B ⋅d 
i iv
σ = pa⋅ + 0,5≤ f (6.5-1)
v
 
2⋅e⋅ z
 
shall be met with regard to internal pressure loading, where with the smaller value of
 
d +e 0,8⋅ (d +e)⋅e
iv
iv
 
r = + (6.5-2)
 
2 tanΘ
 
b
r 2= (6.5-3)
2⋅tanΘ
the value B is found as follows
i
r− 0,25⋅d
iv
B = (6.5-4)
i
r− 0,5⋅(d +e)
iv
Figure 6.5-1 — Mitre bend
6.6 Socket welds
Socket welds can only be used for pipes DN 50 and below.
6.7 Designing with transition joints
6.7.1 Design considerations
The use of transition joints shall be considered during design analysis. Transition joints should be treated as
elements within the piping and the designer should consider all the loadings likely to arise under the design
conditions.
6.7.2 Location of transition joints
A transition joint shall be positioned so that it does not undergo undue loading effects such as tensile and shear
forces or bending and torsional moments. Where appropriate, the transition joint fabricator shall provide
allowable loads or criteria for assessing pressure and combined external loads.
In general, positioning transition joints directly against piping elbows shall as far as possible be avoided.
6.7.3 Requirements for transition joints
Transition joints shall meet the requirements of Annex B.
6.8 Port-hole extruded tubes
Port-hole-extruded tubes in accordance with the EN 755:2016 series can be used up to and including DN 25,
provided that a joint efficiency of 0,7 is applied. When these tubes are subject to a combined pressure-leak-
test for the entire length the joint efficiency can be set to a factor of 1. If this test is carried out
 by the tube manufacturer, the test pressure shall be
e
n
P = ⋅ 0,95⋅R
(6.8-1)
T px
D
e
 by the piping manufacturer, the test pressure shall be
P = 1,43⋅PS (6.8-2)
T
The combined pressure-leak test for achieving a joint efficiency factor of 1 is to be carried out before
integration in the piping system either using helium or a gas mixture containing helium, depending on the
application. It does not replace the pressure test as specified in 9.1 and 9.2.
6.9 Alternative methods
Design by Analysis (DBA) according to EN 13445-3:2021 can be applied, using the method based on stress
categories only.
7 Fabrication and installation
7.1 General
The requirements of EN 13480-4:2024 shall apply with the following additions/exclusions.
NOTE Reference to EN 14717:2005 can be useful to avoid and reduce the possible environmental impacts of
aluminium and aluminium alloy piping.
7.2 Material grouping
Aluminium and aluminium alloy materials and their grouping shall be in accordance with Table 5.2-1.
7.3 Tolerances
7.3.1 Welded pipes and connection dimensions of pipe fittings
Table 7.3-1 applies for welded pipes fabricated in accordance with this European Standard. Connection
dimensions of pipe fittings (e.g. elbows, tees, reducers) shall comply with Table 7.3-1. Greater values can be
acceptable provided they are verified by design calculation.
NOTE 1 For pipe/fitting to flange connection, see EN 1092-4:2002, Table 9.
NOTE 2 Other tolerances can be applied if specified by the designer (see EN 13480-1:2024, 3.1.6).
NOTE 3 For tolerances of material fabricated to other European Standards, see applicable European Standard (e.g.
EN 12392:2016+A1:2022, Clause 7 or EN 1092-4:2002, 5.9).
Table 7.3-1 — Tolerances for welded pipes
Type of tolerance Tolerance Reference
Mean external diameter ± 1,5 %
Out of roundness maximum 1,5 % for the ratio e/D < 0,01 EN 13480-4:2024, Formula
(7.4.1-1)
maximum 1,0 % for the ratio e/D ≥ 0,01
Wall thickness As for sheet, strip or plate EN 485-3:2003; EN 485-4:1993
Out of roundness shall be calculated in accordance with EN 13480-4:2024, Formula (7.4.1-1).
The determination of the out of roundness need not consider the elastic deformation due to dead-weight of
the pipe.
7.3.2 Welded piping construction
EN 13480-4:2024, 5.6 is not applicable for piping in aluminium and aluminium alloys. Guidance for the
tolerances of piping spools made of aluminium and aluminium alloys is given in Annex A.
EN 13480-4:2024, 7.4 is applicable for aluminium and aluminium alloys, except 7.4.4 concerning induction
forming.
The requirements according to EN 13480-4:2024, 9.9 shall apply with the following modification for
aluminium and aluminium alloys: Replace the reference to EN 25817:1992 with EN ISO 10042:2018.
7.4 Cutting and bevelling
In addition to the requirements of EN 13480-4:2024, 6.1 the following shall apply for industrial piping of
aluminium and aluminium alloys:
Aluminium and its alloys shall be cut to size and shape preferably by machining or by thermal cutting process,
e.g. plasma arc cutting, or by a combination of both. Additionally, hydro mechanical methods of edge
preparation are acceptable. Flame cutting is not permitted.
For plates of ≤ 25 mm thickness cold shearing is permissible. Edges that are cut by thermal process or by cold
shearing shall be dressed back by machining unless the manufacturer can demonstrate that the material and
the weldability has not been adversely affected by the cutting process.
The surface to be welded shall be thoroughly cleaned of aluminium oxide traces and greases by mechanical
means or by pickling. Chloride containing detergents are prohibited.
7.5 Bending and other forming
7.5.1 General
The requirements of EN 13480-4:2024, Clause 7 shall apply with the following additions/exclusions.
7.5.2 Definition of cold- and hot forming
Cold forming of material groups 21 and 22 shall be carried out at temperatures below 200 °C.
Cold and hot forming of material of group 23.1 is not allowed.
Hot forming of aluminium and its alloys shall be carried out in a temperature range of 320 °C to 450 °C. The
last stage of the hot forming process shall be completed above 300 °C; otherwise, a subsequent heat treatment
to achieve the O Temper is required.
7.5.3 Heat treatment after cold forming
7.5.3.1 General
For heat treatment after cold forming the requirements of EN 13480-4:2024, 7.2 are not applicable for
industrial piping of aluminium and aluminium alloys. For aluminium and aluminium alloys, the heat treatment
shall be carried out as follows:
The heat treatment parameters shall be in accordance with the material specification of the material
manufacturer. The general heat treatment parameters shall be:
a) the heating rate shall be as rapid as possible;
b) the holding temperature shall be in the range between 320 °C and 380 °C depending on the alloy type;
c) the holding time at the holding temperature shall be between 10 min and 60 min depending on the ratio
of cold forming;
d) the cooling shall be performed in still air, the cooling rate needs not to be controlled.
7.5.3.2 Flat products
For aluminium and aluminium alloys heat treatment shall be carried out in accordance with Table 7.5-1.
Table 7.5-1 — Heat treatment of flat products after cold forming
d
Material groups according to Ratio of deformation
Heat treatment
Table 5.2-1 V (%)
d
21 ≤ 15 % no
a
21 > 15 % yes , annealing
b b b b
22.1 , 22.2 , 22.3 , 22.4 ≤ 5 % no
b b b b c
22.1 , 22.2 , 22.3 , 22.4 > 5 % yes , annealing
a
With levels of cold forming and a ratio of deformation above 15 % for materials of group 21 or above, if it can be
demonstrated in specific cases that the residual elongation after rupture after cold forming remains at least 10 %, then in
these cases annealing is not required.
b
Elongation prior to forming ≥ 14 %.

c
With levels of cold forming and a ratio of deformation above 5 % for materials of group 22 or above, if proof can be
furnished in specific cases that the residual elongation after rupture after cold forming remains at least 10 %, then in these
cases annealing is not required.

d
For V (%) for cylinders and cones, see EN 13480-4:2024, 7.1.3; for V (%) for dished circular products
...