Abstract: A protective device, pertaining to tanks composed of an inside shell (3), an outside shell (4), and at least one metal end piece including a cylindrical joining piece (7) placed substantially in the longitudinal axis of the tank, comprises on each joining piece (7), a truncated protective metal collar (22) having the same conicity as the end piece of the joining piece and having an outside diameter at least equal to that of said end piece, the protective collar being solidary with a collet screwed on the outside part of the corresponding joining piece; and a washer (23) made of elastic material inserted between the protective collar and the outside surface of the end of the tank, and a pinch nut 24 screwed on the joining piece over the protective collar.

Abstract: A high pressure tank, for containing fluid under pressure of the type comprising an internal shell (3) intended to act as a seal and an external shell (4) intended to provide mechanical strength, with the interposition between the two shells of a first cap (5) located on the side forming the bottom and of a second cap (10) located on the side forming the open end of the tank, made in a single piece with a connecting neck (7), is characterized in that the part of the internal shell (3) located on the side forming the open end of the tank (2) is fixed on to the metal piece (6) forming a neck (7) and cap (10) over the entire contact surface (16) between the two components (3, 6), while the outer surface (13) of the cap (10) and part of the exterior surface of the neck (7) are covered by the external shell (4).