Regarding CO2 storage tanks
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Low-temperature carbon dioxide storage tanks are classified as low-temperature vessels according to the 150 standards, but these standards do not require retesting of 16MnDR material; instead, they only require retesting of low-temperature welding materials for diffused hydrogen or moisture content. 18442 is a fixed-type low-temperature insulated cryogenic pressure vessel. What is the concept of cryogenics? According to Baidu Baike, cryogenics refers to temperatures below -100°C. So, does carbon dioxide belong to cryogenic liquids? Do carbon dioxide storage tanks need to comply with the 18442 standard? The material requirements specified in 18442 call for retesting.
Who can give some advice? The people at my workplace aren’t sure either, as there’s no defined standard for what constitutes a cryogenic liquid. .
It is preliminarily assumed that the poster is from a container manufacturing company; they follow the requirements specified in the design drawings. But what standards are used for those design drawings? Why must the concept of cryogenic cooling be introduced?
Cryogenic equipment generally consists of two parts: an outer vacuum-insulated shell with several layers, and an inner stainless steel container
Under normal operating conditions: the properties of the carbon dioxide medium mean that the container cannot be classified as Category 3; for 16MnDR material, it is sufficient that its impact resistance at the operating temperature meets the requirements specified in GB150 and relevant standards
This is merely a low-temperature device
Just use 150; ignore 18442.
In terms of instrumentation, CO2 is considered only a low-temperature gas, not a cryogenic one.
Liquid carbon dioxide is only around -20 degrees; how can that be related to cryogenics?
According to the personnel responsible for standard 18442, this standard applies to cryogenic liquefied gases, which are substances with a critical temperature below -50°C, as defined in the standards for cryogenic liquefied gas tank containers. According to this definition, 18442 is not applicable to carbon dioxide storage tanks.