What type of vessel carries liquefied natural gas?

The correct answer identifies that liquefied natural gas (LNG) is typically carried in a cryogenic vessel. Cryogenic vessels are specifically designed to transport substances that are stored at very low temperatures, which is essential for LNG. Natural gas must be cooled to around -162 degrees Celsius (-260 degrees Fahrenheit) to become liquefied, and ordinary vessels cannot withstand the extreme conditions involved in this process.

These vessels are equipped with insulation and other features to keep the LNG at its required temperature during transport and ensure safety and efficiency. They also prevent the LNG from vaporizing, which can occur if the temperature rises.

The other options do not appropriately describe the specific characteristics and requirements of carrying LNG. For example, while a tanker vessel may refer to a type of ship used for transporting liquids, it does not specifically denote the cryogenic capabilities necessary for LNG. Similarly, the term liquefied flammable vessel is vague and does not necessarily indicate that it can handle cryogenic temperatures. Chemical vessels also have a broad application, but they are not designed specifically for the extreme temperature conditions of LNG transport.