SIST EN 17339:2025/oprA1:2026

• Abstract:

  This document specifies minimum requirements for the materials, design, construction, prototype testing and routine manufacturing inspections of composite gas cylinders and tubes for compressed hydrogen.; NOTE 1 Unless specified in the text, for the purposes of this document, the word “cylinder” includes tubes.; This document applies to ; - fully wrapped composite cylinders (Type 3 and Type 4) ; - hoop wrapped cylinders (Type 2) ; with carbon fibres intended to be permanently mounted in a frame (e.g. bundle or trailer) with a test pressure of not less than 300 bar, with:; — non-metallic liners (for Type 4) or seamless metallic liners (for Type 2 and Type 3),; — a maximum water capacity of 3 000 l; — a maximum working pressure of 1 000 bar.; — the product of working pressure times water capacity (p x V) not exceeding 1 000 000 bar.l.; NOTE 2 A glass fibre protective layer is sometimes applied to the external surface of the cylinder

• Status: Not Published
• Public Enquiry End Date: 02-Aug-2026
• ICS: 23.020.35 - Gas cylinders
• Technical Committee: TLP - Pressure vessels
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 28-May-2026
• Due Date: 15-Oct-2026
• Completion Date: 10-Aug-2026
• Directive: 2008/68/EC - Directive 2008/68/EC of the European Parliament and of the council of 24 September 2008 on the inland transport of the dangerous goods
• Mandate: M/TDG - Standards for referencing in the RID-ADR
• Ref Project: EN 17339:2024/prA1 - Transportable gas cylinders - Hoop wrapped and fully wrapped carbon composite cylinders and tubes for hydrogen

• Revises: SIST EN 17339:2025 - Transportable gas cylinders - Hoop wrapped and fully wrapped carbon composite cylinders and tubes for hydrogen
• Effective Date: 01-Jul-2026

SIST EN 17339:2025/oprA1:2026 is a CEN draft amendment to EN 17339:2024 for transportable gas cylinders and tubes for hydrogen. It updates requirements for hoop wrapped and fully wrapped carbon composite cylinders and tubes, covering materials, design, construction, prototype testing and routine manufacturing inspections for Type 2, Type 3 and Type 4 cylinders used with compressed hydrogen.

What does SIST EN 17339:2025/oprA1:2026 specify?

SIST EN 17339:2025/oprA1:2026 specifies changes to the rules for composite cylinders and tubes intended for compressed hydrogen service and permanently mounted in a frame, such as a bundle or trailer. It applies to carbon-fibre cylinders with non-metallic liners for Type 4 or seamless metallic liners for Type 2 and Type 3, with a test pressure of at least 300 bar, water capacity up to 3 000 l, working pressure up to 1 000 bar, and p x V not exceeding 1 000 000 bar.l.

A glass fibre protective layer may also be used on the outside surface of the cylinder.

Clause / annex	What it changes
5.1	Cylinder definition and permitted additional permanent parts
6.1	Test articles and use of additional permanent parts in tests
6.2.8.1	Blunt impact procedure and extreme-temperature cycle testing
Annex A	Prototype, design variant and production testing

What are the key requirements of SIST EN 17339:2025/oprA1:2026?

SIST EN 17339:2025/oprA1:2026 mainly changes how the cylinder is defined for testing, how an impact test is carried out, and how extreme-temperature cycling is run. It also updates the annex on prototype, design-variant and production testing so the evidence matches the modified cylinder construction.

Cylinder definition and test articles

Clause 5.1 now allows additional permanent parts such as neck rings, foot rings or dome protectors to be part of the cylinder. In practice, this means the design can include those fitted parts without treating them as outside the cylinder definition.

Clause 6.1 then allows those permanent parts to be used in all tests when they are part of the cylinder definition. For a manufacturer or test laboratory, this avoids testing a stripped-down vessel that is different from the supplied cylinder.

Impact and cycle testing

Clause 6.2.8.1 changes the blunt impact procedure so one impact is made at 45° on the shoulder at the mid arc length of the dome half, identified as position S/2 in Figure 2. This matters because the impact point is fixed and repeatable, which improves consistency between tests.

The same clause revises the extreme-temperature cycle test. One stage starts at 65 °C and applies 5 000 cycles up to maximum developed pressure, with the cycle rate limited so the temperature conditions can be maintained. A second stage starts at -40 °C and applies 5 000 cycles up to working pressure at 15 °C, followed by 30 cycles after the cylinder has returned to ambient conditions. In practice, this sets the thermal and pressure sequence that laboratories must reproduce.

Prototype, design-variant and production testing

Annex A updates the table for prototype, design-variant and production testing. It separates the treatment of carbon fibre tensile properties and matrix properties, and points readers to the applicable test standards in 6.2.1.1. This tells suppliers which material properties need evidence when a cylinder is approved and when production is being controlled.

Annex A also adds a footnote to Table A.5 that limits when the last-column rule applies. In practical terms, this affects how design changes are judged against the existing tested design.

What changed in SIST EN 17339:2025/oprA1:2026 from EN 17339:2024?

SIST EN 17339:2025/oprA1:2026 modifies EN 17339:2024 in four places:

• Clause 5.1 now allows additional permanent parts such as neck rings, foot rings and dome protectors.
• Clause 6.1 now allows those permanent parts to be used for all tests when they belong to the cylinder definition.
• Clause 6.2.8.1 changes the blunt impact location and the extreme-temperature cycling procedure.
• Annex A revises prototype, design-variant and production testing, including Table A.1 and the footnote added to Table A.5.

Who uses SIST EN 17339:2025/oprA1:2026?

SIST EN 17339:2025/oprA1:2026 is used by manufacturers of hydrogen cylinders and tubes, composite material suppliers, test laboratories, and organizations that review prototype, design-variant and production testing. It is also relevant to quality and technical staff who need to decide whether a cylinder design, its permanent fittings, and its test evidence match the document’s requirements.

What does the SIST EN 17339:2025/oprA1:2026 document contain?

SIST EN 17339:2025/oprA1:2026 contains a European foreword and four modification items. It edits clause 5.1, clause 6.1, clause 6.2.8.1 and Annex A, including Figure 2, Table A.1 and Table A.5.

The document focuses on cylinder definition, permitted permanent parts, blunt impact locations, temperature-controlled pressure cycling, and the test evidence needed for prototype, design-variant and production control.

SLOVENSKI STANDARD
01-julij-2026
Premične plinske jeklenke - Popolnoma obvite in po obodu obvite jeklenke in
velike jeklenke za vodik iz kompozitnih materialov z ogljikovimi vlakni - Dopolnilo
A1
Transportable gas cylinders - Hoop wrapped and fully wrapped carbon composite
cylinders and tubes for hydrogen
Ortsbewegliche Gasflaschen - Vollumwickelte Flaschen und Großflaschen aus
KohlenstoffVerbundwerkstoffen für Wasserstoff
Bouteilles à gaz transportables - Bouteilles et tubes entièrement bobinées en matériaux
composites carbones pour l'hydrogène
Ta slovenski standard je istoveten z: EN 17339:2024/prA1
ICS:
23.020.35 Plinske jeklenke Gas cylinders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 17339:2024
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
June 2026
ICS 23.020.35
English Version
Transportable gas cylinders - Hoop wrapped and fully
wrapped carbon composite cylinders and tubes for
hydrogen
Bouteilles à gaz transportables - Bouteilles et tubes Ortsbewegliche Gasflaschen - Vollumwickelte Flaschen
frettés et entièrement bobinés en matériaux und Großflaschen aus Kohlenstoff-Composite-
composites carbones pour l'hydrogène Werkstoffen für Wasserstoff
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 23.

This draft amendment A1, if approved, will modify the European Standard EN 17339:2024. If this draft becomes an amendment,
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration.

This draft amendment was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17339:2024/prA1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modification to 5.1, “General requirements” . 4
2 Modification to 6.1, “General” .
...