Fully refrigerated Cargoes are carried at atmospheric pressure but at a temperature below the atmospheric boiling point.Very suitable for LNG,but can also be used for LPG and ammonia LNG carriers do not generally have a reliquification plant but LPG carriers may Prismatic tanks or membrane wall systems may be used.Prismatic tanks are self supporting but they must be tied to the main hull structure. Prismatic tank Water ballast Void space A Liquid level Secondary Barrier(Outer skin) heihipBaierinnerskin Tank Supports Membrane tanks Membrane tanks are rectangular and rely on the main hull of the ship for strength shown is typical Bulkhead secondary barrier) Mineral wool Wood ground Foam wegge 3 sections of balsa 4Fully refrigerated Cargoes are carried at atmospheric pressure but at a temperature below the atmospheric boiling point. Very suitable for LNG, but can also be used for LPG and ammonia ( LNG carriers do not generally have a reliquification plant but LPG carriers may ) Prismatic tanks or membrane wall systems may be used. Prismatic tanks are self supporting but they must be tied to the main hull structure. Prismatic tank Membrane tanks Membrane tanks are rectangular and rely on the main hull of the ship for strength. The primary barrier may be corrugated in order to impart additional strength and to account for movement due to change of temperature. Systems vary but the arrangement shown is typical. 4