Vacuum powder insulated storage tank – construction process issues

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For low-temperature liquid CO2 storage tanks using vacuum powder insulation (pearlite sand), this is the first time our company has dealt with such systems. Could you please explain the actual sequence and methods involved in the heat treatment of the inner cylinder during manufacturing, as well as the pneumatic testing and assembly of the inner and outer cylinders? Personal insight: There is always a conflict between pressure testing, heat treatment, and equipment installation; once the inner and outer cylinders are installed, it becomes difficult to carry out inspections and repairs during heat treatment and pressure testing ； It is not convenient to install the outer cylinder first, as the inner cylinder needs to undergo heat treatment and pressure testing. Please advise and provide a detailed explanation, thank you!