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Double-walled (‘bain marie’)
Next to half-coil jacket vessels and dimple jacket vessels, double-walled or 3 double-walled boilers built on the ‘bain marie’ principle are one of the ways to control and regulate temperatures in a vessel or reactor.
The three technologies have their advantages and disadvantages, but double-walled vessels are still very popular, especially in applications where a vessel is brought to a temperature once, and remains at that level for the rest of the production.
As a rule, two jackets are constructed which are then welded together keeping a specific distance between them, which is primarily used to circulate water. Normally, a layer of insulation is applied to the outer jacket to minimize heat losses, and then covered all around with metal plating.