Support device for at least one instrument on a tower for loading and/or offloading a tank of a ship intended to contain a liquefied gas

A loading and/or offloading assembly for a tank of a ship configured to contain a liquefied gas comprising a loading and/or offloading tower comprising a plurality of vertical masts configured to extend in the tank and linked to one another, pairwise, by struts, each strut extending on an axis called strut axis, at least one instrument and at least one support device of the at least one instrument, the loading and/or offloading assembly being characterized in that the support device comprises:

• a distal portion extending on a first axis, the distal portion being terminated by a first surface forming a first surface contact with a strut extending on its strut axis substantially at right angles to the first axis, the first surface having, in a configuration of installation, a degree of freedom in rotation about said strut axis;
• a proximal portion extending on a second axis substantially at right angles to the first axis, linked to the distal portion;
• a fixing surface having, in the configuration of installation, a degree of freedom in rotation about the second axis and a degree of freedom in translation on a third axis parallel to the second axis, the fixing surface being immobilized by fixing to the instrument in a final configuration;
• and
• a platform comprising the fixing surface and a positioning surface configured to couple the proximal portion to the fixing surface, wherein the positioning surface has a shape that is complimentary to a shape of the proximal portion to allow for the degree of freedom in rotation about the second axis and the degree of freedom in translation on a third axis parallel to the second axis.