IMPROVED METHOD TO PRODUCE HIGH-RESISTANCE COMPOSITE VESSELS WITH INNER METAL LINER AND VESSELS MADE BY SAID METHOD

摘要

Method for the production of a high-resistance tank, comprising an initial stage in which a closed metal vessel is formed, followed by a second stage in which the walls of said vessel are subjected to a mechanical pre-tensioning treatment in both the axial and radial directions, up to a predetermined value. This mechanical treatment comprises a stage in which the tank is enclosed inside a mould of suitably larger dimensions. A liquid is then introduced in the tank, and this liquid is pressurised until the walls of the tank are dilated and stretched to a point where they encounter the inner surface of the mould. Subsequently, the outside of the tank is coated with one or more layers of composite material, so as to complete the construction of the tank, upon which a final auto-frettage treatment is carried out. The type of steel to be used is AISI 304, preferably in its more weldable AISI 304L version.