Engineering Liquid Hydrogen Transport: The CTT 20FT and 40FT Cryogenic ISO Tank Container

Thermal performance starts with the complete container design

For liquid hydrogen, insulation cannot be treated as an isolated component.

The thermal performance of a cryogenic tank container depends on the complete heat-transfer system: insulation architecture, vessel geometry, support structures, piping penetrations, interfaces between the inner vessel and outer structure, and every conductive path between the cryogenic vessel and the environment.

CTT approaches liquid-hydrogen containment as an integrated engineering problem.

The CTT liquid hydrogen tank container incorporates a proprietary, in-house-developed insulation concept combined with an optimised structural arrangement designed to minimise conductive heat paths and thermal bridging.

Particular attention is given to the interfaces between the inner vessel and the supporting structure. These areas are critical in very-low-temperature applications because even comparatively small conductive heat paths can materially affect the overall thermal performance of the system.

The objective is not simply to add more insulation. It is to create the most effective balance between thermal protection, usable internal volume, structural integrity, transport requirements, operating pressure, tare mass and long-term operational reliability.

This distinction is particularly important for liquid hydrogen because the cargo is primarily volume-limited rather than mass-limited.

A fully loaded 40FT CTT hydrogen container remains substantially below its maximum permissible gross mass. This provides the engineering freedom to optimise thermal protection and structural performance without the same payload-versus-weight constraint found in many other transported liquids.

Designed around the properties of liquid hydrogen

Liquid hydrogen has a density of approximately 71 kg/m3 in the relevant cryogenic range. Its low density means that the available internal volume of the vessel directly determines the quantity of hydrogen that can be transported.

For this reason, the relationship between insulation performance and usable internal volume is particularly important.

An insulation system that occupies excessive space reduces payload. An insufficient thermal system reduces operating margin.

The engineering objective is to achieve strong thermal performance while maintaining an efficient internal vessel volume within the standard ISO container envelope.

This is one of the central design principles behind the CTT configuration.

Operational margin for real transport conditions

Cryogenic transport rarely consists of uninterrupted movement from loading point to customer.

A liquid hydrogen container may spend substantial periods waiting at a terminal, awaiting vessel departure, undergoing customs procedures, standing in a rail or intermodal terminal, waiting for unloading infrastructure or remaining temporarily at the receiving site before transfer.

These stationary periods are part of the real logistics cycle and must be considered together with the actual transport time.

For liquid hydrogen, thermal performance creates operational margin.

A well-engineered container gives operators greater flexibility when dealing with schedule changes, multimodal transfers, extended dwell periods and routes where logistics conditions cannot be predicted precisely.

This becomes particularly relevant for European hydrogen supply chains, where road routing may also be affected by ADR restrictions applicable to UN1966 and by the individual transport requirements of the intended route.

20FT and 40FT configurations

Not every hydrogen application requires the largest possible transport quantity.

CTT develops the liquid hydrogen platform in both 20FT and 40FT configurations.

The 40FT unit provides maximum transport capacity within the standard ISO format and is suited to applications where larger hydrogen quantities and longer logistics cycles are required.

The 20FT configuration provides a more compact alternative for operations where hydrogen consumption, site infrastructure or handling capability does not justify a full 40FT quantity.

This is particularly relevant for emerging hydrogen applications, where demand is often project-based rather than continuous.

Application: hydrogen refuelling infrastructure

Liquid hydrogen transport can provide an efficient supply model for high-throughput hydrogen mobility applications.

Potential applications include:

Heavy-duty hydrogen refuelling stations

Truck corridors and high-capacity stations may require hydrogen volumes beyond the practical delivery capacity of conventional compressed-gas logistics.

Bus depots and fleet operations

Centralised fleet refuelling can create predictable hydrogen demand suitable for liquid delivery.

Ports and airports

Hydrogen-powered ground equipment, vehicles and future maritime or aviation applications can create concentrated demand at infrastructure hubs.

Rail applications

Hydrogen-powered rail fleets and associated refuelling infrastructure may require substantial hydrogen quantities at locations distant from liquefaction facilities.

The tank container can also form part of a rotational logistics concept where containers are exchanged as required rather than relying exclusively on permanent bulk storage.

Application: aerospace, propulsion and testing

Liquid hydrogen is also relevant to aerospace propulsion, engine development and cryogenic testing.

These operations frequently have irregular consumption profiles.

Test programmes can be postponed. Launch schedules change. Cryogenic testing may take place in campaigns rather than continuously.

A transportable liquid hydrogen container provides both logistics flexibility and temporary inventory capacity.

Potential applications include rocket and propulsion programmes, engine test facilities, aerospace development centres, cryogenic research facilities, component and materials testing, and specialised hydrogen laboratories.

Application: pilot plants and hydrogen projects

Many hydrogen projects are still developing from demonstration scale toward commercial operation.

Typical examples include hydrogen valleys, electrolyser commissioning, liquefaction projects, demonstration fleets, industrial hydrogen trials, mining and heavy-equipment projects, port hydrogen projects, temporary hydrogen supply and first-phase refuelling infrastructure.

In these situations, permanent bulk storage may be economically or operationally premature.

A cryogenic ISO tank container can provide a more flexible solution because the same asset can be transported to the project, integrated into the site's transfer system and repositioned when the campaign is completed.

This makes the concept particularly attractive where demand is temporary, uncertain or expected to increase gradually.

Application: islands, coastal locations and remote sites

Liquid hydrogen logistics become significantly more demanding when several transport modes are involved.

Island and coastal supply may combine:

road transport → port handling → sea transport → local road transport → temporary site storage.

The ISO container format allows the hydrogen to remain within the same containment system throughout these logistics stages, avoiding unnecessary transfer operations between separate transport vessels.

The comparatively low laden mass of a liquid hydrogen container can also be advantageous for locations with restricted infrastructure, including ferry ramps, older port facilities, remote industrial locations and local road networks with weight limitations.

Multimodal by design

The ISO tank-container concept provides an important logistics advantage: the containment system travels with the product.

Rather than transferring the liquid hydrogen between different transport vessels for each transport mode, the container itself can move through the logistics chain.

Depending on the approval scope of the individual unit and the intended route, this can support combinations of:

road + rail + sea

within a single transport concept.

For emerging European hydrogen infrastructure, this flexibility can be particularly important because liquefaction capacity and hydrogen demand may be separated by considerable distances.

CTT 40FT liquid hydrogen configuration

Key parameters for the CTT 40FT liquid hydrogen ISO tank container include:

The design framework includes EN 13530-2:2002/AC:2006, ADR 2025 and ASME Section VIII Division 1.

A 20FT configuration with approximately 15 m3 nominal capacity is also available for production, with final technical parameters defined for the ordered configuration.

Engineering the complete hydrogen logistics solution

Liquid hydrogen transport cannot be reduced to one headline specification.

Capacity, operating pressure, thermal performance, usable volume, transport approvals, route conditions and receiving infrastructure all interact.

For that reason, CTT approaches liquid hydrogen tank containers as complete engineering systems rather than simply cryogenic vessels installed inside an ISO frame.

The combination of an in-house-developed thermal concept, optimised vessel and support geometry, minimised thermal bridges, 20FT and 40FT configurations and multimodal ISO architecture provides a platform designed for demanding hydrogen logistics.

From hydrogen mobility and industrial supply to aerospace programmes, pilot projects, island distribution and temporary storage, the objective is the same:

to keep liquid hydrogen safely contained, efficiently transportable and operationally flexible throughout the complete logistics cycle.