Vessel for containing a pressurized gas with improved endpiece

A vessel for containing a pressurized gas comprising:

• a generally cylindrical plastic liner extending along a main axis, comprising a neck surrounding an axial orifice of the liner;
• a reinforcing shell covering the liner;
• and
• an endpiece extending along the main axis at least partially provided in the neck, the endpiece comprising at least:
• an axial opening,
• a first annular protrusion extending radially outwards from the vessel with respect to the axial opening,
• a second annular protrusion extending radially outwards from the vessel with respect to the axial opening, the second annular protrusion being arranged axially outwards from the vessel with respect to the first annular protrusion, and
• an outer axial end extending at least partially outside the vessel,
• wherein the liner extends from the first annular protrusion to the second annular protrusion, covering at least a portion of the first annular protrusion, and
• wherein the vessel further comprises a sealing contact surface between the endpiece and the neck of the liner, which extends between the first annular protrusion and the second annular protrusion, and a contact surface between the endpiece and the reinforcing shell, which extends axially between the second annular protrusion and the outer axial end of the endpiece.

A method for manufacturing a vessel for containing a pressurized gas, the method comprising the following steps:

• supplying an endpiece extending along a main axis, comprising an axial opening, a first annular protrusion extending radially outwards from the vessel with respect to the axial opening, a second annular protrusion extending radially outwards from the vessel with respect to the axial opening, the second annular protrusion being configured to be arranged axially outwards of the vessel with respect to the first annular protrusion, and an outer axial end configured to extend at least partially outside the vessel;
• manufacturing a generally cylindrical liner extending along an axis, the liner comprising a neck surrounding an axial orifice of the liner;
• attaching the endpiece to the liner, so that the endpiece is at least partially provided in the neck of the liner and the neck extends along the main axis, and so as to create a sealed contact surface between the endpiece and the neck of the liner, which extends between the first annular protrusion and the second annular protrusion, and
• attaching a reinforcing shell to the liner and to the endpiece, so that the reinforcing shell covers the liner, and so as to create a contact surface between the endpiece and the reinforcing shell which extends axially between the second annular protrusion and the outer axial end of the endpiece.