A two-section assembly chamber includes a section S1 (11) and a section S2 (12), whose shapes are selected between cylindrical, where section S1 (11) has a diameter larger than the section S2 (12), and in the shape of a conical frustum, where sections S1 (11) and S2 (12) form a conical frustum, where the conical frustum begins at S1 (11) with the wider part and ends at S2 (12) with the narrower part, both sections S1 (11) and S2 (12) are joined or welded together, and are removable, each having respective caps (21, 22), wherein the assembly chamber has at least one perforation for introducing a pressurized fluid. The assembly chamber is configured so that a tube (30) or a second chamber, which has a larger diameter than the section S2 (12), is assembled within the inner diameter of the section S2 (12).

A sealed and insulating tank for storing and/or transporting a liquefied gas has a sealed and self-supporting internal reservoir with an interior surface for contacting the liquefied gas and an outer surface with an insulating barrier covering the outer surface of the internal reservoir. The insulating barrier is fixed to the internal reservoir. An outer sealed membrane covers an outer surface of the insulating barrier, and the outer sealed membrane has a metal sheet provided with bellows or corrugations. The outer sealed membrane is fixed to the insulating barrier or the internal reservoir. An intermediate space between the internal reservoir and the outer sealed membrane contains a gaseous phase under depression in order to press the outer sealed membrane against the outer surface of the insulating barrier.

In an embodiment a pressure vessel assembly includes a pressure vessel having a cylinder part and dome-shape dome parts arranged at opposite ends of the cylinder part and protectors, each protector including an inner protector having a first strength and an outer protector having a second strength being higher than the first strength, wherein the outer protector surrounds a surface of the inner protector, and wherein the protector covers an outer surface of a corresponding dome part.

In an embodiment a pressure vessel assembly includes a pressure vessel having a cylinder part and dome-shape dome parts arranged at opposite ends of the cylinder part and protectors, each protector including an inner protector having a first strength and an outer protector having a second strength being higher than the first strength, wherein the outer protector surrounds a surface of the inner protector, and wherein the protector covers an outer surface of a corresponding dome part.