Outer half-pipe segmentation of the reaction vessel

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Help: The volume of the reactor is 22 m3, with dimensions of Φ2600XH4200. There is an outer tube surrounding the reactor; the medium flowing in this outer tube is steam and circulating water. As required by the process, the steam connection for this outer tube has a diameter of DN100, which means that the diameter of the outer tube itself is DN150. The reaction taking place inside the reactor is an exothermic reaction, and it is necessary to reach a certain temperature for the reaction to start. In this case, is it necessary to divide the outer half-pipe into sections? Heat transfer will certainly be better with sections compared to having no sections, but is it really necessary to do so in this situation? What situations has everyone encountered where it was necessary to segment the outer half-pipe? Thank you all first!