Turbo-Brayton Subcoolers

The industry standard for onboard Boil-Off Gas (BOG) reliquefaction. Our oil-free, plug-and-play cryogenic subcoolers manage boil-off to prevent cargo loss, ensuring maximum efficiency for LNG carriers, FSRUs, and bunkering vessels.

Download our brochure Discover our offshore BOG solution for retrofit operations

Managing LNG boil-off gas on vessels requires highly efficient, adaptable solutions. Our marine-certified Turbo-Brayton technology ensures zero-loss transport with steady efficiency from 0 to 100%.

Proven offshore subcooling technology 

Our Turbo-Brayton cryogenic systems have been specifically developed for shipyards, charterers, and ship-owners. Operating as a subcooler, the technology seamlessly integrates into both atmospheric and pressurized storage without requiring compressed air, oil, or refrigerant gas make-ups.

Key benefits for offshore fleets:

  • Single skid solution: Fast, plug-and-play installation with a low footprint, ideal for both new builds and retrofitted vessels.
  • Oil-free & contact-free: Delivering an MTBF (Mean Time Between Failures) of 105,000 hours.
  • Unmatched reliability: Preventive maintenance interval of just a few days every 5 years.
  • Flexible & automated: Unlimited starts/stops with instantaneous cooling power and unmanned operation.

Seamless retrofits for existing fleets

To remain commercially viable and meet IMO regulations (like the CII), the existing global fleet must modernize. Air Liquide leads the retrofit sector, boasting 32 successful references with units reliably operating for over 5 years.

Because subcooling works directly on the bulk liquid, it avoids the expensive "re-engineering" of the ship’s existing gas management system. Our skidded solution offers a highly compact footprint, enabling a true "plug-and-play" installation that could take weeks, rather than months, in dry-dock.

  • 300+ units sold worldwide

    With 300 units sold and over 130 currently in operation across the globe, Air Liquide’s Turbo-Brayton technology possesses an unmatched maritime heritage. Marine-certified, these plug-and-play systems offer instantaneous starts, "cold standby" capabilities, and steady efficiency from 0 to 100%, guaranteeing absolute reliability for the world's most demanding shipowners.

Frequently Asked Questions (FAQ)

What types of vessels are compatible with the Turbo-Brayton subcooler?

Our boil-off reliquefaction solution is highly adaptable and suited for a wide range of offshore fleets. Compatible vessels include:

  • Bunker vessels and bunker barges (from 1,000 to 30,000 m3).
  • LNG-fuelled vessels.
  • LNG carriers (from 5,000 to 270,000 m3).
  • Multigas carriers (Ethane, Ethylene, LNG, etc) 
  • FSRUs (Floating Storage Regasification Units) 
  • FSUs (Floating Storage Units).

Is the Turbo-Brayton technology suitable for retrofitting existing ships?

Yes, the system is designed for easy integration into existing fleets. Because our subcooling technology works directly on the bulk liquid, it entirely avoids the expensive re-engineering of the ship’s existing gas management system. The skidded solution offers a highly compact footprint, enabling a true "plug-and-play" installation that could take weeks, rather than months, in dry-dock.

What is the maintenance schedule for the Turbo-Brayton system?

The Turbo-Brayton system is built for unmatched reliability, requiring a preventive maintenance interval of just a few days every 5 years. Because the system is 100% oil-free and contact-free, it delivers an exceptional MTBF (Mean Time Between Failures) of 105,000 hours.

Does the subcooler require make-up gases or external air to operate?

No, it operates entirely independently, requiring no compressed air, no oil, or any refrigerant gas make-ups.

Does the subcooler operation depend on the type of tanks?

The technology seamlessly integrates into both atmospheric and pressurized storage systems.

How does the system handle varying boil-off gas management demands?

Our marine-certified Turbo-Brayton technology ensures zero-loss transport with steady efficiency ranging from 0 to 100%. The system is fully automated for unmanned operation and offers high flexibility, including unlimited starts and stops, instantaneous cooling power, and "cold standby" capabilities.

Documentation

  • Turbo-Brayton Subcooler for Liquefied Natural Gas (LNG) boil-off reliquefaction
    Download the document PDF (833.86 KB)

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