EN 13445-8:2026/FprA1

• Abstract:

  This document specifies requirements for unfired pressure vessels and their parts made of aluminium and aluminium alloys in addition to the general requirements for unfired pressure vessels under EN 13445:2021 Parts 1 to 5. This document specifies unfired pressure vessels for loads up to 500 full cycles.; NOTE Cast materials are not included in this version. Details regarding cast materials will be subject to an amendment to or a revision of this document.

• Status: Not Published
• Publication Date: 06-Sep-2026
• Withdrawal Date: 27-Jul-2020
• ICS: 23.020.30 - Pressure vessels, gas cylinders
• Technical Committee: CEN/TC 54 - Unfired pressure vessels
• Drafting Committee: CEN/TC 54/WG 60 - Aluminium
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 30-Jan-2026
• Completion Date: 30-Jan-2026
• Directive: Harmonized Standard2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Directive:

  ---

  Not Harmonized97/23/EC - Pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Mandate: M/601 - COMMISSION IMPLEMENTING DECISION of 1.3.2024 on a standardisation request to the European Committee for Standardization and the European Committee for Electrotechnical Standardization as regards pressure equipment and assemblies in support of Directive 2014/68/EU of the European Parliament and of the Council
• Ref Project: SIST EN 13445-8:2014/oprA2:2018 - Unfired pressure vessels - Part 8: Additional requirements for pressure vessels of aluminium and aluminium alloys

• Amends: EN 13445-8:2021 - Unfired pressure vessels - Part 8: Additional requirements for pressure vessels of aluminium and aluminium alloys
• Effective Date: 22-Dec-2021

Overview

EN 13445-8:2026/FprA1 is a key part of the European standard covering unfired pressure vessels, with a specific focus on vessels and their components manufactured from aluminium and aluminium alloys. Developed by CEN (European Committee for Standardization), this standard provides additional requirements that supplement the general provisions outlined in EN 13445:2021 Parts 1 to 5. It applies to pressure vessels subjected to up to 500 full load cycles, ensuring that the unique characteristics of aluminium and its alloys are appropriately addressed in safety and design. Notably, this standard does not cover cast materials, with further details expected in future revisions.

Key Topics

EN 13445-8:2026/FprA1 encompasses a range of essential subjects related to designing, fabricating, and inspecting unfired aluminium pressure vessels:

• Material Selection and Chemical Composition: Specifies requirements for acceptable aluminium alloys, compositional limits, and the need for materials with low hydrogen and lead content during manufacture, as recommended by EN 12392:2016.
• Material Grouping and Temper Conditions: Outlines which product forms and tempers are suitable for vessel construction, referencing the latest material standards.
• Design Considerations: Guides for design temperature, pressure, and assessment of material properties to mitigate risks like grain boundary precipitation at elevated temperatures.
• Fatigue and Cyclic Loading: Provides detailed annexes covering fatigue assessment, essential when vessels undergo up to 500 load cycles, including inspection recommendations for critical areas.
• Fabrication and Welding: Highlights welding requirements specific to aluminium alloys, including welder qualifications, preheat procedures, and acceptance standards for weld imperfections.
• Inspection and Testing: Defines non-destructive testing (NDT) methods (e.g., radiographic, ultrasonic, penetrant testing), their extent, and quality acceptance levels, especially for cyclic service and critical zones.
• In-Service Monitoring: Recommends best practices for ongoing inspection and recording of load cycles to support vessel integrity over its service life.

Applications

EN 13445-8:2026/FprA1 applies across a range of industries where lightweight, corrosion-resistant pressure containment is crucial. Typical applications include:

• Chemical Processing: Vessels storing or transporting gases and liquids where reduced vessel weight and corrosion resistance enhance efficiency and lifespan.
• Cryogenic and Gas Storage: Suitable for vessels operating at low temperatures or handling cryogenic fluids due to aluminium's favorable performance at cold temperatures.
• Pharmaceutical and Food Industries: Where hygiene and chemical compatibility are key, and non-ferrous pressure vessels are preferred.
• Energy and Environmental Sectors: Lightweight aluminium vessels provide advantages in renewable energy, water treatment, and similar installations.
• Industrial OEM and Fabrication: As a reference for manufacturers and engineers designing pressure equipment that must comply with EU regulatory requirements and directives, notably the Pressure Equipment Directive (PED) 2014/68/EU.

Related Standards

Compliance with EN 13445-8:2026/FprA1 should be considered alongside other critical standards for unfired pressure vessels and aluminium products, including:

• EN 13445-2:2014 – Materials for unfired pressure vessels
• EN 13445-3:2014 – Design
• EN 13445-4:2014 – Fabrication
• EN 13445-5:2014 – Inspection and testing
• EN 12392:2016 – Aluminium and aluminium alloys, products for pressure equipment
• EN 764-4:2014 – Technical delivery conditions for metallic materials
• EN ISO 23277:2015, EN ISO 17640:2017 – Non-destructive testing of welds
• EN 13480-8:2017 – Metallic industrial piping: requirements for aluminium and aluminium alloy piping

Practical Value

Adopting EN 13445-8:2026/FprA1 ensures that aluminium unfired pressure vessels meet stringent safety, quality, and regulatory requirements. It helps designers and manufacturers:

• Manage material-specific risks in vessel construction and operation
• Achieve compliance with EU regulations, supporting market access
• Enhance safety throughout the vessel’s lifecycle, especially in cyclic service
• Align with proven industry practices for inspection, testing, and in-service monitoring

For engineers, manufacturers, and end-users, following this standard facilitates reliable, durable, and regulatory-compliant delivery of pressure equipment built from aluminium and aluminium alloys.

SLOVENSKI STANDARD
01-november-2018
1HRJUHYDQHQHNXUMHQHWODþQHSRVRGHGHO'RGDWQH]DKWHYH]DWODþQHSRVRGH
L]DOXPLQLMDLQDOXPLQLMHYLK]OLWLQ'RSROQLOR$
Unfired pressure vessels - Part 8: Additional requirements for pressure vessels of
aluminium and aluminium alloys
Unbefeuerte Druckbehälter - Teil 8: Zusätzliche Anforderungen an Druckbehälter aus
Aluminium und Aluminiumlegierungen
Récipients sous pression non soumis à la flamme - Partie 8 : Exigences
complémentaires pour les récipients sous pression en aluminium et alliages d'aluminium
Ta slovenski standard je istoveten z: EN 13445-8:2014/prA2
ICS:
23.020.32 7ODþQHSRVRGH Pressure vessels
77.150.10 Aluminijski izdelki Aluminium products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 13445-8:2014
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA2
October 2018
ICS 23.020.30
English Version
Unfired pressure vessels - Part 8: Additional requirements
for pressure vessels of aluminium and aluminium alloys
Récipients sous pression non soumis à la flamme - Unbefeuerte Druckbehälter - Teil 8: Zusätzliche
Partie 8 : Exigences complémentaires pour les Anforderungen an Druckbehälter aus Aluminium und
récipients sous pression en aluminium et alliages Aluminiumlegierungen
d'aluminium
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 54.

This draft amendment A2, if approved, will modify the European Standard EN 13445-8:2014. 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13445-8:2014/prA2:2018 E
worldwide for CEN national Members.

EN 13445-8:2014/prA2:2018 (E)
Contents Page
European foreword . 3
1 Modification in the whole document . 4
2 Modifications to Clause 2, Normative references . 4
3 Modification to 5.3, Prevention of brittle fracture . 4
4 Modification to 5.5, Chemical composition . 4
5 Modifications to 5.6, Material grouping system . 4
6 Modifications to 6.2, Design temperature and properties . 5
7 Modification to 6.3, Time-independent nominal design stress . 5
8 Modification to 6.5, Fatigue design . 5
9 Addition of a new Subclause 6.7, Openings with reinforcing pads . 5
10 Addition of a new Subclause 6.11, Limitations in testing groups . 6
11 Modification to 7.6, Qualification of welders and welding operators . 6
12 Modification to 7.8, Preheat . 6
13 Modifications to 8.2.1, General . 6
14 Modifications to 8.3, Determination of extent of non destructive testing . 7
15 Modifications to 8.4.1, NDT methods . 9
16 Modification to 8.5, Selection of non-destructive testing methods for internal
imperfections. 10
17 Modification to A.1, General . 10
18 Modification to A.5, Plate . 11
19 Addition of a new Annex B (normative), Detailed assessment of fatigue life . 14
20 Addition of a new Annex C (informative), In-service monitoring of vessels operating
in fatigue service . 20
21 Modifications to the final Bibliography . 21

EN 13445-8:2014/prA2:2018 (E)
European foreword
This document (EN 13445-8:2014/prA2:2018) has been prepared by Technical Committee CEN/TC 54
“Unfired pressure vessels”, the secretariat of which is held by BSI.
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 2014/68/EU.
For relationship with EU Directive 2014/68/EU, see informative Annex ZA, which is an integral part of
EN 13445-8:2014.
EN 13445-8:2014/prA2:2018 (E)
1 Modification in the whole document
Replace all the references to "EN ISO 23277:2009" with "EN ISO 23277:2015".
2 Modifications to Clause 2, Normative references
Replace the whole reference to "EN 12392:2000" with the following one:
"EN 12392:2016, Aluminium and aluminium alloys — Wrought products and cast products — Special
requirements for products intended for the production of pressure equipment".
Replace the whole reference to "EN 13445-2:2009" with the following one:
"EN 13445-2:2014, Unfired pressure vessels — Part 2: Materials".
Replace the whole reference to "EN 13445-3:2009" with the following one:
"EN 13445-3:2014, Unfired pressure vessels —Part 3: Design".
Replace the whole reference to "EN 13445-4:2009" with the following one:
"EN 13445-4:2014, Unfired pressure vessels —Part 4: Fabrication".
Replace the whole reference to "EN 13445-5:2009" with the following one:
"EN 13445-5:2014, Unfired pressure vessels —Part 5: Inspection and testing".
Replace the whole reference to "EN ISO 23277:2009" with the following one:
"EN ISO 23277:2015, Non-destructive testing of welds — Penetrant testing — Acceptance levels
(ISO 23277:2015)".
3 Modification to 5.3, Prevention of brittle fracture
Delete the NOTE.
4 Modification to 5.5, Chemical composition
Replace this subclause with the following:
"The chemical composition shall be in accordance with the material specification.
It is recommended that the material to be used for welded components be produced from rolling or
extrusion ingots with hydrogen level no greater than 0,2 ml per 100 g aluminium, measured on liquid
metal during casting (see EN 12392:2016, 7.6, accompanying text to Table 2).
EN 12392:2016, 7.6 (accompanying text to Table 2) recommends a maximum lead content not
exceeding 150 μg/g.".
5 Modifications to 5.6, Material grouping system
Replace the heading with the following:
"
5.6 Materials and material grouping system
".
EN 13445-8:2014/prA2:2018 (E)
Replace the 2nd paragraph with the following, in which the references were updated:
"Any product form available in EN 12392:2016 for a material in Table 5.6-1 at an acceptable temper is
acceptable for construction to this European Standard, as long as the requirements of 5.2 and 5.5 are
fulfilled. Other materials not defined here may be used by agreement by the parties concerned (see
EN 13445-2:2014, 4.1.4) if they meet the requirements of 5.2 and 5.5 and a particular material
appraisal is produced (see EN 764-4:2014).".
In the title of Table 5.6-1 replace "EN 12392:2000" with "EN 12392:2016".
Insert before Table 5.6-1 itself the following sentence:
"Components that are fabricated, tested and inspected according to EN 13480-8:2017 can be used
without any further testing and inspection. The joint efficiency of the component shall be considered in
the pressure vessel design. For circumferential welds included in this component the exent of NDT shall
not be less than required in Table 8.3-1.".
6 Modifications to 6.2, Design temperature and properties
Replace references to EN 13445-2:2009 with reference to EN 13445-2:2014.
Replace the paragraph starting with “For materials of group 22.4 temperatures…” with the following:
"For materials of group 22.4 temperatures above 75 °C may result in grain boundary precipitation of
Al -Mg . These materials may be used at temperatures above 75 °C up to 200 °C only for non-corrosive
3 2
service.".
In NOTE 2 replace the reference "EN 12392:2000" with "EN 12392:2016", and in the subsequent
paragraph, replace the reference to "EN 12392:2000" with "EN 12392:2016".
Replace the pemultimate paragraph with the following:
"For aluminium and aluminium alloys values of 0,2 % proof stress (or 1 % proof stress for material
group 21-1 000 series aluminium) for temperatures above 20 °C shall be established by linear
interpolation between two adjacent values in Annex A except that for alloys 5083 and 5086 the
respective value at 50 °C may be used for 65 °C.".
7 Modification to 6.3, Time-independent nominal design stress
In Table 6.3-2, replace the reference to "EN 12392:2000" with "EN 12392:2016".
8 Modification to 6.5, Fatigue design
Replace the complete existing text with the following:
"For pressure vessels other than testing group 4, fatigue design for over 500 equivalent cycles is
covered in Annex B of this document. For the determination of 500 full equivalent pressure cycles
see EN 13445-3:2014, 5.4.2.".
9 Addition of a new Subclause 6.7, Openings with reinforcing pads
Add a new Subclause 6.7 and re-number the subsequent subclauses under Clause 6 accordingly:
"
6.7 Openings with reinforcing pads
Where an opening is fitted with a reinforcing plate with the presence of a nozzle, d /2r shall not
ib is
exceed 0,8.
EN 13445-8:2014/prA2:2018 (E)
For cases where a reinforcing pad contributes to the reinforcement (see EN 13445-3:2014, Figures 9.4-
3, 9.4-4, and 9.4-10):
— reinforcing plates shall be fitted in close contact with the shell;
— the width of a reinforcing plate l ' to be considered as contributing to reinforcement is given by:
p
'
l = min l ; l (6.7-1)
( )
p so p
— the value of e shall not exceed the following:
np
e ≤ 1.5 e (6.7-2)
np ns
— e and l are dimensions of reinforcing pads used in equations for openings that may be reinforced
a,p p
also by reinforcing pads; if a reinforcing pad is not present then the values e and l shall be set
a,p p
equal to zero. If the reinforcing pad is contributing to reinforcement then, for all cases:
Af = l ' ∙ e (6.7-3)
p p p
10 Addition of a new Subclause 6.11, Limitations in testing groups
"
6.11 Limitations in testing groups
Limitations in testing groups as specified in EN 13445-3:2014, Annex A, Tables A-1 to A-9, shall be
considered only if the weld detail covers governing welds (see EN 13445-3:2014, 5.6, for definition of
governing welds).".
11 Modification to 7.6, Qualification of welders and welding operators
1)
Replace the content of the Subclause with the following, whilst deleting Footnote :
"The requirements in EN 13445-4:2014, 7.4, shall apply with the following modification: Replace
reference to EN ISO 9606-1:2017 with EN ISO 9606-2:2004.".
12 Modification to 7.8, Preheat
Add to List Entry 7.8 b) the following text:
"For wall thicknesses over 30 mm this temperature limit may be increased to 200 °C provided that the
preheat temperature is qualified by the WPQR.".
13 Modifications to 8.2.1, General
Replace the third paragraph with the following (in which the first indent was modified - a restriction to
PS ≤ 20 bar is technically not justified):
"Testing group 4 shall be applicable only for:
— TS ≤ 75 °C;
— maximum number of full pressure cycles ≤ 500; and
— lower level of nominal design stress (according to EN 13445-3:2014).".
EN 13445-8:2014/prA2:2018 (E)
In Table 8.2-1, in the 1st column, in the 5th row, replace “Maximum thickness for which specific materials
are permitted” with "Maximum thickness at the weld for which specific materials are permitted".
14 Modifications to 8.3, Determination of extent of non destructive testing
Add a new row in Table 8.3-1 (below line numbers 17/18/19, e.g. as 19a), with new boundary conditions
(D2 < 50 mm, D1 < 800 mm, b ≤ 0,15 mm) and NDT requirements as in 17/18/19:
— Prerequisite: only non-corrosive service;
— New Figure 8.3-1 to 19a: nozzle-to-shell connection for non-corrosive service, D2 < 50 mm,
D1 < 800 mm, b ≤ 0,15 mm:
"
Table 8.3-1 (concluded)
Testing
1 2 3 4
group
21, 22.1
Parent
21, 22.1 21, 22.1
21, 22.1 to 22.4
materials to 22.4 to 22.4,
to 22.4 (except
o
l m n
except 23.1 and 23.1
EN AW 5454)
a b
Type of weld   Testing Extent Extent Extent Extent
g
Nozzle or 15 With full penetration if RT or UT 25 % (100–10) % 10 % 0
e
branch di > 200 mm and e > 25 mm
p
PT p p p 0
0 0 0
16 With full penetration if RT or UT NA NA NA 0
d ≤ 200 mm or e ≤ 25 mm
i g p p d p p
PT 25 % (25–10) % 10 % 0
17, 18, With partial penetration for RT or UT NA NA NA 0
19 any di and a > 16 mm
g p p d p p
j 25 % (25–10) % 10 % 0
PT
Nozzle or 19a D2 < 50 mm, D1 < 800 mm, RT or UT NA NA NA 0
e
branch b ≤ 0,15 mm
g p p d p p
j 25 % (25–10) % 10 % 0
PT
Only non-
corrosive
service
(see Figure 8.3–
1)
Tube ends into 20  PT or leak 100 % 100 % 10 % 0
q
tube sheet test
Permanent 21 With full penetration or RT or UT 0 0 0 0
attachments partial penetration
p p p p
PT 25 % 25 % 25 % 0
p
Pressure 22  PT 100 % 100 % 100 % 0
retaining areas
after removal
of temporary
attachments
Cladding by 23  PT NA NA NA NA
h
welding
Repairs 24 RT or UT NDT of repairs shall be 100 % of the area of repair by NDT methods
as stated on the type of weld above.
PT
Finned tube to 25 D1 < 50 mm RT or UT NA NA NA 0
tube socket g p p d p p
j 25 % (25–10) % 10 % 0
...