The issue of atmospheric heat retention
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Whether the atmosphere needs insulation or not, and what are the advantages and disadvantages of each approach
It depends on what kind of raw materials are processed by your pressure relief device. If the material coming out of the top of the tower is involved in processes that occur later in the process chain, as is the case in winter in the north, where oils and other materials tend to solidify, insulation is necessary. Light oils or materials with good fluidity and lower viscosity requirements don’t need such insulation. At my site, there are materials with very poor thermal viscosity coming out of the tower top; the atmospheric legs not only provide insulation but also have heating elements, and this is also related to the local climate conditions.
The pressure-relief atmospheric leg is sealed with a water seal; with low outdoor temperatures in winter, it’s no wonder it doesn’t freeze
Generally, insulation is not required! ! ! ! ! !