DEVICE FOR THERMALLY INSULATING ONE OR MORE ELEMENTS OF A SUBSEA INSTALLATION FROM AMBIENT COLD SEA WATER

A device for thermally insulating at least one element of a subsea installation from ambient cold sea water, the device comprising an external casing which encloses an internal fluid chamber. The fluid chamber accommodates a fluid having heat-storing capacity, the element being received in the fluid chamber with the fluid surrounding the element so as to allow the fluid to delay cooling of the element by means of heat stored in the fluid. A heat storing member is mounted in the fluid chamber so as to be surrounded by the fluid. The heat storing member contains a medium having heat-storing capacity so as to allow transfer of heat from the fluid to the medium in the heat storing and vice versa to thereby allow the heat storing member to delay cooling of the fluid by means of heat stored in the medium in the heat storing member.