Design and Advantages LNT A-BOX is a cargo containment system for safe and reliable storage and transportation of LNG and other liquefied gases in bulk. See More System Videos Play Video Key Features An un-insulated IMO independent tank type A in an insulated hold space. Characteristics 1. Primary Barrier Self-supporting IMO independent tank type A 2. Insulation & Secondary Barrier Liquid tight insulation system acting as full secondary barrier fixed to the hull of the vessel 3. Interbarrier Space Accessible space between the tank insulation 4. Cargo Tank Support System Preventing bodily movement of the tank Explaining IMO Type A Tank Back