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  Definitions and Classifications of Gases Classifications of Gases Compressed Gases Characteristics: Non-liquefied at ordinary temperatures, even under high pressure. Stored at high pressures in containers. Pressure Criteria: A gas or mixture of gases in a container with an absolute pressure exceeding 40 psi at 70°F (21°C). A gas or mixture of gases in a container with an absolute pressure exceeding 104 psi at 130°F (54°C), regardless of the pressure at 70°F (21°C). A liquid with a vapour pressure exceeding 40 psi at 100°F (38°C), as determined by ASTM D-323-72. Examples: Helium Nitrogen Oxygen Argon Liquefied Compressed Gases Characteristics: Become liquid at normal temperatures when pressurized inside a cylinder. Examples: Ammonia Chlorine Methane Natural Gas Liquefied Petroleum Gas (LPG) (e.g., Propane and Butane) Refrigerated Liquefied Gases (Cryogens) Characteristics: Maintained at very low temperatures. Boiling points below -150°C. Heavier than air at cold temperatures, accu...

  Detailed Production Process of Cryogenic Pressure Vessels Cryogenic pressure vessels are specialized equipment extensively used in the chemical, petroleum, and energy industries, primarily for storing and transporting liquefied gases. Their production process is meticulous and complex, involving several critical steps. Below is the primary production process for cryogenic pressure vessels: store and transport liquefied gases Design and Material Selection: The design of cryogenic pressure vessels must comply with relevant safety standards and regulations, such as ASME and GB. The design considerations include the vessel's working pressure, temperature, volume, and the characteristics of the contained medium. Material selection is crucial, typically involving steels with excellent cryogenic properties, such as 9% nickel steel, to ensure good mechanical performance at extremely low temperatures. Cutting and Forming: Once the materials pass inspection, they are cut according to t...