EN 17339 Explained — Hydrogen Composite Cylinders for Transport (2024 Type 2 Update)
EN 17339 is the European standard for hydrogen carbon-composite cylinders and tubes — but specifically for the cylinders that transport and store hydrogen, not the cylinders mounted on a vehicle or aircraft. Its full title is “Transportable gas cylinders — Hoop wrapped and fully wrapped carbon composite cylinders and tubes for hydrogen.” It is prepared by CEN/TC 23 (BSI secretariat) and acquires legal force through reference in RID and the technical annexes of ADR — the European rail and road dangerous-goods regulations. The 2024 revision introduced Type 2 hoop-wrapped construction, which is the single substantive technical change since the 2020 first edition.
What EN 17339 covers — and what it doesn’t
The standard applies to carbon-fibre composite cylinders and tubes for compressed hydrogen service that are permanently mounted in a frame — a bundle per EN ISO 10961, or a trailer / MEGC (Multiple-Element Gas Container) per EN 13807. The design envelope:
- Test pressure ≥ 300 bar
- Maximum working pressure 1 000 bar
- Maximum water capacity 3 000 L per cylinder
- Product p × V ≤ 1 000 000 bar·L
It is hydrogen-dedicated. The safety factor framework reflects that: design margins are applied to p_max (the maximum developed pressure at 65 °C, taken as 1.18 × p_w) rather than to the working pressure directly. Hydrostatic test pressure is set at p_h = 1.5 × p_w. This is a deliberate departure from generic transportable-gas logic — hydrogen-specific behaviour drives the design margins, not the gas-agnostic ratios of legacy standards.
What EN 17339 does not cover
Important — and frequently misunderstood:
- Standalone vehicle-mounted fuel tanks. Those are governed by ISO 19881, EC 79/2009 (now repealed), UN Regulation 134, and UN Regulation 110. EN 17339 is not in that family.
- Liquid hydrogen (LH₂). Cryogenic storage is out of scope.
This matters for supply-chain positioning. If you’re integrating an airframe-mounted hydrogen tank on a UAV, or a fuel-cell vehicle storage system, EN 17339 is not your design specification — it’s the standard that governs the trucking, MEGC, and bundle storage of the hydrogen that gets delivered to your refuelling station. EN 17339 is upstream in the hydrogen supply chain, not downstream at the vehicle.
Standards architecture and legal force
EN 17339 is prepared by CEN/TC 23 (Transportable gas cylinders technical committee), with BSI holding the secretariat. The standard itself is voluntary, but it is referenced in:
- RID — Regulations concerning the International Carriage of Dangerous Goods by Rail
- ADR — European Agreement concerning the International Carriage of Dangerous Goods by Road, technical annexes
That reference is what gives EN 17339 legal force in EU hydrogen transport. A bundle, MEGC, or trailer carrying hydrogen for road or rail transport in EU member states must demonstrate compliance with EN 17339 (or an equivalent path) to ship.
The standard was developed under CEN/TC 23 / WG 16 — the working group covering composite cylinders. MEYER participated in the working group as a COPV expert, contributing to the standard.
The 2024 headline change: Type 2 cylinders are now in scope
The CEN foreword to the 2024 revision states the technical change explicitly:
“EN 17339:2024 includes the following significant technical changes with respect to EN 17339:2020: introduction of Type 2 cylinders (hoop wrapped cylinders).”
That’s the single substantive change called out, and it propagates through the document in several places. The 2020 edition was fully-wrapped only — Type 3 (full wrap over a load-bearing metallic liner) and Type 4 (full wrap over a non-load-sharing polymer liner with metal bosses). The 2024 edition adds Type 2: hoop-wrapped construction where the composite reinforcement covers only the cylindrical sidewall, leaving the domes as bare metal.
Type-to-liner mapping (Clause 5.1)
| Type | Composite coverage | Liner requirement |
|---|---|---|
| Type 2 | Hoop-wrapped (sidewall only) | Seamless metallic liner — domes carry pressure, so polymer liners are excluded by construction |
| Type 3 | Fully wrapped | Seamless metallic liner |
| Type 4 | Fully wrapped | Non-metallic (polymer) liner with metal bosses |
You cannot build a Type 2 with a polymer liner under EN 17339, because by construction the bare-metal domes carry pressure. The standard is now formalised on this point.
The 16-test qualification programme (Clause 6 and Annex A)
The complete test programme, with applicability:
| # | Test | Applies to |
|---|---|---|
| 1 | Composite materials | All |
| 2 | Liner materials | All (provisions per liner type) |
| 3 | Liner burst | All |
| 4 | Pressure proof | All |
| 5 | Cylinder burst | All |
| 6 | Pressure cycling | All |
| 7 | Elevated temperature exposure | All |
| 8 | Blunt impact | All |
| 9 | Flawed cylinder test | Fully wrapped only (Type 3 / Type 4) |
| 10 | Extreme temperature cycling | All |
| 11 | Fire resistance | All |
| 12 | Permeability (non-metallic liners) | Type 4 only — Types 2 and 3 have a metallic gas barrier |
| 13 | Torque on taper threads | All (where applicable) |
| 14 | Parallel-thread shear (steel liners and bosses) | All metallic interfaces |
| 15 | Neck strength | All |
| 16 | Neck ring | All |
The two type-specific tests are worth understanding:
- Test 9 — Flawed cylinder test. Exercises the composite’s ability to carry load with intentionally introduced cuts in the overwrap. It is a Type 3 / Type 4 acceptance test by design and is not meaningful on a Type 2, where the composite is in the hoop direction only.
- Test 12 — Permeability. Intrinsically a Type 4 test. Types 2 and 3 have a metallic gas barrier (the seamless metallic liner) that reduces permeation to negligible levels; Test 12 measures the polymer-liner-specific permeation behaviour that is the defining design constraint of Type 4.
Annexes
- Annex A — prototype, design-variant and production testing protocols. Updated to include Type 2 design-variant paths.
- Annex B — certificate templates. Type 2 now has its own certificate path.
- Annex C — high-velocity bullet test (informative, not required). Unchanged in substance.
What didn’t change in 2024
Worth stating, because it’s the larger part of the document: the design-and-manufacture clause for composite overwraps (winding parameters, batch traceability, autofrettage), the normative reference set, the safety-factor framework (p_max = 1.18 × p_w; p_h = 1.5 × p_w), the marking clause, and the conformity evaluation flow are all carried forward unchanged.
Practical implication: if you have a Type 3 or Type 4 design previously qualified to EN 17339:2020, the 2024 revision does not by itself trigger requalification. The changes are additive (adding Type 2) rather than restrictive on the existing types.
Normative references
- EN ISO 9809-1 / -2 / -4 — seamless steel cylinder design (for metallic-liner Type 3)
- EN ISO 7866 — seamless aluminium-alloy cylinders (for metallic-liner construction)
- EN ISO 11120 — seamless steel tubes (for tube applications)
- EN ISO 11114-1 / -2 / -4 — gas/material compatibility, including hydrogen compatibility provisions
- EN ISO 13769 — cylinder marking (stamp marking)
- EN ISO 10961 — bundle design (where the cylinder lives in service)
- EN 13807 — battery vehicle / MEGC design
How EN 17339 differs from related standards
| Standard | Application | Where MEYER product fits |
|---|---|---|
| EN 17339 | Transportable hydrogen bundles, MEGCs, trailers | Upstream supply chain — hydrogen logistics |
| ISO 11119-3 | General Type IV composite cylinders for any compressed gas | Baseline qualification path for HDRX cylinders |
| ISO 19881 | Vehicle-mounted hydrogen fuel tanks | Where on-vehicle / on-airframe storage is going |
| UN R134 / EU 2019/2144 | Hydrogen vehicle type-approval | EU H₂ mobility framework |
| UN R110 | CNG/hydrogen vehicle conversion | Heavy-duty H₂ retrofit path |
What to ask a supplier
- Is this cylinder qualified to EN 17339:2024 (or :2020 for Type 3/4 designs predating the 2024 revision)?
- What is the cylinder Type — 2, 3, or 4 — and what is the liner construction?
- What’s the documented test report against the 16-test programme, including the type-specific tests (Test 9, Test 12)?
- Where is the cylinder integrated — bundle (EN ISO 10961), MEGC (EN 13807), or other? EN 17339 only covers permanently-frame-mounted service.
- Does the supplier hold the π-mark certificate for hydrogen transport under TPED?
What MEYER offers
For applications in EN 17339’s scope — composite cylinders and tubes integrated into hydrogen-transport bundles, MEGCs, and trailers — MEYER manufactures Type 4 cylinders qualifiable to EN 17339 on a programme-by-programme basis. Most of the cylinders in the MEYER COPV catalog can be qualified to EN 17339 when the application calls for it — the qualification path is established and the production line is set up for the test programme described above. Documentation pack includes the test programme reports (1–16 as applicable), liner-specific permeability data (Test 12), the π-mark certificate, and materials traceability.
For applications outside EN 17339’s scope — vehicle-mounted, airframe-mounted, or otherwise non-frame-integrated — the qualification path runs through ISO 19881, UN R134, or programme-specific aerospace standards instead. We can advise on the right qualification path for your application.
