Method for production of an acid proof, seemless pressure vessel

A method for production of a cylindrical acid proof seamless pressure vessel having hemispherical bottom and top by powder molding in a hot isostatic pressing (HIP) process, wherein the method comprises:

• producing an assembled and filled molding shell that includes:
• producing an internal shell, a lower part of an external shell, and an upper part of an external shell having a filling spout, the internal and external shells having corresponding hemispherical tops and bottoms and the internal and external shells each comprising a sheet mold,
• producing a plurality of distance pins,
• mounting the distance pins extending from the internal shell,
• inserting the internal shell into the lower part of the external shell,
• closing a volume between the internal and external shells with the upper part of the external shell, and
• filling the volume with a powder through the filling spout;
• placing the assembled and filled molding shell in process container;
• vacuuming and sealing the HIP-process container;
• and
• supplying the HIP-process container with an inert gas at a pressure and a temperature pursuant to a HIP process, for processing the powder in-between the shells together with the distance pins to a compact and homogenous vessel material.