Does an propylene sphere tank need insulation, and what are the advantages and disadvantages of insulation?

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In the propylene spherical tanks built in the past, most of the parameters were as follows, with no insulation at all. However, due to the owner’s special requirements, there are also exceptions where insulation is applied. 4000 m3 of propylene: -48/50, 07MnNiMoDR; 3000 m3 of propylene: -45/50, 07MnNiMoDR; 3000 m3 of propylene: -19/50, 07MnMoVR/Q370R. So when is insulation necessary and when isn’t it needed? Spherical tanks stored at room temperature do not require insulation. Using insulation is a conservative design approach. What are the advantages and disadvantages of using alkene for insulation? Advantages: 1. In case of a fire, it can prevent or reduce leaks, thus avoiding the occurrence of large-scale fires. 2. Insulation helps to minimize pressure fluctuations experienced by the tank, providing some protection for it over time. Disadvantages: 1. Regular inspections and maintenance are troublesome; the 07Mn material requires inspection in the first year, and low-alloy high-strength steels are prone to delayed cracking, so inspections need to be carried out more frequently compared to ordinary materials. Fun fact: Regulations regarding the initial inspection and maintenance of spherical tanks, as well as subsequent inspections. Key quality control challenges related to quenched and tempered high-strength steel and 07Mn steel used in low-temperature spherical tanks. 2. High construction costs, resulting in lower economic efficiency. 3. High costs for regular maintenance