Abstract: Disclosed is a process for producing a blank from an item that is configured to equip a rotating-joint device of an installation for mining fluids, in particular on an offshore platform, including the following steps: providing at least one strip of a predetermined material; providing at least one production support that is at least partially annular and that has a predetermined outer diameter; arranging the at least one strip of a predetermined material around the production support until a predetermined thickness is obtained; and removing the production support to obtain the item blank that has a predetermined cross-section.