Help: Design of jacketed containers
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There is a jacketed vessel made entirely of stainless steel. The head and the cylinder body of the vessel are connected together using two set of flange bolts. The design temperature for the vessel’s cylinder body is 80 degrees, while the design temperature for the jacket is -75 degrees. The medium inside the cylinder body is flammable and toxic; the liquid nitrogen is found in the jacket. Should this vessel be considered as a low-temperature vessel during design? How should the welding factors, inspection ratios, and pressure testing procedures for the inner cylinder and the jacket be determined?
Austenitic stainless steel vessels with a design temperature of -196°C or higher do not need to be considered as cryogenic vessels. But the temperature of liquid nitrogen can’t be -75°C, right?
The landlord needs to confirm the liquid nitrogen temperature; toxic materials should definitely undergo 100% non-destructive testing. For pressure testing, it depends on what the design takes into account; personally, I think a pneumatic test plus a airtightness test could be considered