Regarding the issue with the low-temperature storage tank shell

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According to the new regulatory requirements, the inner liner and outer shell of jacketed vessels shall have manufacturing specifications specified separately according to their respective categories. So the jacket contains pearlescent sand (solid) and the inner cylinder, while the pressure vessel holds gases and liquids; can it be considered that the outer shell does not belong to a pressure vessel and is therefore not subject to regulatory requirements? 150 Article 1 These standards specify the construction requirements for metal pressure vessels (hereinafter referred to as vessels). Does this sentence mean that the casing also does not fall under category 150? Then the housing just needs to be manufactured in accordance with the requirements of GB/T18442? Is my understanding correct? Please give me some guidance, experts.