Improvements in and relating to storage vessels

摘要

A method for the manufacture of storage vessels including the steps of: fabricating a hollow and substantially enclosed cylindrical shape, having a tubular portion and two ends, from metal; constraining the cylindrical shape about each end only; and applying pressure to the interior of the cylindrical shape, the pressure being sufficient to plastically deform the metal and to permanently change at least the shape of the tubular portion of the cylindrical shape to produce a storage vessel that is substantially barrel shaped.