Patent ID: 8894913

Claim:
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.