Vacuum insulated transfer lines and accessories

Nexans cryogenic systems are in-house engineered and built on our core technology of flexible vacuum-insulated cryogenic transfer lines. Vacuum insulated transfer lines, also called vacuum jacketed piping, are double-walled piping systems designed to achieve the superior level of thermal insulation between the inner and outer pipe.

Nexans offer provides the highest level of thermal insulation thanks to the action combination of 3 components of heat transfer:

• radiation from the outer wall to the inner wall is prevented by multilayer insulation, which reflects heat waves

• convection is inhibited by the factory generation of a high level of static vacuum between the inner and outer tubes

• conduction is minimized by contact points between the inner and outer tube optimized in number and surface area.

   

This configuration allows the safe transfer of cryogenic fluids with minimal boil-off and maximal user safety. Our wide know-how in cryogenics ensure we deliver a complete solution with the transfer lines and their specific coupling for an enhanced system reliability.

A flexible & modular approach to cryogenic transfer infrastructures

In addition to conventional rigid piping systems for transfering liquified gas, Nexans has developed 2 full ranges of flexible vacuum insulated transfer lines that can be applied for static and dynamic applications. 

Nexans CRYOFLEX® is the product range for static applications while Nexans HIGHFLEX is the product range for dynamic applications, used for applications requiring a high flexibility.

These systems and their thermal insulation were originally designed for transfering liquefied helium at temperature as low as 4K. Our unique technology ensures they can cover all cryogenic fluids (Helium - 4K, Hydrogen - 20K, Nitrogen - 77K, Oxygen - 90K, LNG - 110K).

Driven by the safety and undisputable quality standards, our robust flexible vacuum insulated lines designs are made with corrugated stainless steel tubes, bringing unmatched advantages:

• Thermal compensation between inner and outer wall is achieved by design, removing the need to add a compensation box to the configuration
• Systems are fully industrialised in our factory, including welding of end fittings, and vacuum pumping. All welds are controlled and tested for He leakage ensuring a high system reliability.
• Systems are delivered on drums, ready for service, reducing installation time and complexity.

Main product ranges