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Turbo-Brayton cryogenic systems

Turbo-Brayton for the reliquefaction of BOG

Turbo-Brayton cryogenic systems for the reliquefaction of Boil-Off Gas

The Turbo-Brayton technology for Boil-Off Gas (BOG) reliquefaction has been specifically developed for marine applications; for shipyards, charterers or ship-owners.

It is a fast and easy-to-install skid-mounted product, that is suited to both atmospheric and pressurized storage. With cooling power available instantaneously from stand-by mode to full capacity and low electrical consumption, Turbo-Brayton technology is extremely reliable. Its maintenance interval is 5 years.

The Turbo-Brayton range has reliquefaction capacities varying from 0.2 t/h to 1.8 t/h, and more by duplicating modules. This boil-off reliquefication system can be installed on both new constructions and retrofitted vessels.

A Boil-off reliquefaction solution that is suited to a wide range of vessels

  • Bunker vessels and bunker barges (from 1,000 to 30,000 m3
  • LNG-powered vessels
  • LNG carriers (from 15,000 to 200,000 m3)
  • Multigas carriers
  • FLNG

Off-shore Turbo-Brayton range







Reliquefaction range (t/h)

0 to 0.2

0 to 0.5

0 to 1

0 to 1.4

0 to 1.6

Electrical consumption (kW)






Weight (t)






Footprint (Lxlxh)






Key benefits

  • Low installation cost and time – skid mounted system, low utilities: only water and electricity
  • High reliability – thanks to their magnetic bearings, Turbo-Brayton systems offer exceptional reliability
  • Low maintenance – a few days every 5 years
  • Oil-free system – no risk of damage due to oil contamination, no risk of losses from operational downtime
  • Cooling power available instantaneously – less than 5 min from stand-by mode
  • Multigas reliquefaction – LNG, Ethylene, Propane, Ethane, Nitrogen
  • Suitable for atmospheric and pressurized storages
  • Safe technology – inert process gas, no permanent refill of process gas required
  • Fast and easy integration – no impact on tank design, retrofit-friendly
  • Low electrical consumption
  • Designed for unmanned operation

Technology in action

The first bunker vessel to be fitted with a reliquefaction system will use the Turbo-Brayton technology.
Manufactured by STX shipyard, the owner is Shell and the bunker vessel is in operation since June 2017. Following the Cardissa (Shell Bunker vessel) success, several others LNG bunker vessels will be equipped with Air Liquide Turbo-Brayton reliquefaction solution.

Air Liquide has also provided two LNG reliquefaction units Turbo-Brayton ("TBF-1050"), which will be installed on two LNG carrier vessels 174K manufactured by Samsung Heavy Industries. Those LNG carrier vessels have been ordered by GasLog Ltd and will be chartered by Shell. The Turbo-Brayton cryogenic system liquefies LNG on board, to avoid any flare of Boil Off Gas (BOG) during voyage.

Turbo-Brayton for LNG bunker vessel