Tom Danitschek

This is the inside of an LNG cargo tank on a modern LNG carrier. It may look like a metallic maze, but every layer is carefully engineered to safely contain gas at -162°C. Most modern LNG ships use the Gaztransport & Technigaz membrane system, where the tank is built directly into the ship’s hull using a layered containment system rather than separate spherical tanks. In the heart of this system is the primary containment. This is the layer that directly holds the LNG. It is made from thin corrugated materials such as stainless steel or Invar (a nickel-steel alloy). The corrugated design is critical because it allows the material to expand and contract under extreme cold without cracking or failing. It’s a cryogenic material because LNG is extremely cold. Behind this sits the insulation system, which is what is most visible in the image. These are prefabricated insulation boxes made from materials like reinforced polyurethane foam or perlite-filled panels. Their role is to minimize heat entering the tank and maintain the extremely low temperature required to keep the gas in liquid form. Next is the secondary containment system, which acts as a backup safety layer. In the unlikely event that the primary barrier fails, this layer prevents the LNG from reaching the ship’s hull. It is typically made from composite materials such as Triplex, combining aluminum foil and fiberglass for strength and impermeability. There is also a secondary layer of insulation that adds further thermal protection and structural support, ensuring stability throughout the voyage. All these layers sit against the ship’s inner hull, which is shielded from the extreme cold. Without this protection, the hull steel would become brittle and unsafe. In simple terms, the primary barrier holds the LNG, the secondary barrier provides backup protection, and the insulation keeps everything cold and stable. What you’re looking at is not just a tank, but a highly engineered cold containment system that makes global LNG transportation possible.

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