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The ethane gas is an important petrochemical product which is widely existing in natural gas and petroleum. Since the boiling point of ethane is -88.6°C, the storage of liquefied ethane gas requires low-temperature or cryogenic pressure vessels. Generally, it is stored in spherical storage tanks made from ASTM A203 Gr.D (3.5% nickel steel) plates, which exhibit excellent impact toughness at the minimum low temperature of -101°C [-150°F].