Patent ID: 8267166

Claim:
An arrangement for heat transport used for thermally insulating at least one subsea tubular containing hydrocarbons, comprising: a thermally insulating casing arranged to enclose a fluid having heat-storing capacity so as to prevent the fluid from flowing out into surroundings of the casing, said casing having an internal space for receiving said at least one tubular and said fluid with the fluid surrounding the at least one tubular so as to allow the fluid to delay cooling of the at least one tubular, by heat stored in the fluid, and a guide arranged in the internal space of the casing, the guide being arranged to divide the internal space of the casing into different zones in fluid communication with each other, the guide being arranged to form a channel that encloses at least a part of the at least one tubular and through which fluid heated by said at least one tubular will flow upwards so as to flow out through an upper outlet of the channel at the top of said internal space into an adjacent zone that is also in fluid communication with a lower inlet of the channel at the bottom of said internal space, so as to guide the fluid in said internal space in such a manner that a circulation and mixing of the fluid will be generated essentially throughout said internal space under the action of occurring temperature differences in the fluid, whereby the natural tendency for temperature stratification of the fluid is counteracted or eliminated.