Non-uniform cylinder

A pressure vessel for isostatic pressing comprising:

• radially pre-stressing means arranged for exerting radial compressive forces on the pressure vessel, with the pressure vessel being arranged with a non-uniform wall thickness;
• and
• said wall having portions with a thicker wall thickness at an upper and a lower end portion of the pressure vessel and having portions with a thinner wall thickness at a central portion of the pressure vessel, with a diameter relationship between an outer diameter and an inner diameter of the pressure vessel being less than 1.2 at a central portion of the pressure vessel;
• wherein an inner surface of the wall of the pressure vessel is provided with steps resulting in a reduced thickness at the central portion.

A pressure vessel for isostatic pressing comprising:

• radially pre-stressing means arranged for exerting radial compressive forces on the pressure vessel, with the pressure vessel being arranged with a non-uniform wall thickness;
• and
• said wall having portions with a thicker wall thickness at an upper and a lower end portion of the pressure vessel and having portions with a thinner wall thickness at a central portion of the pressure vessel, with a diameter relationship between an outer diameter and an inner diameter of the pressure vessel being less than 1.2 at a central portion of the pressure vessel;
• wherein said wall thickness is gradually reduced along tapered portions from said upper and lower end portions to said central portion by inner surfaces of the walls of said pressure vessel being partly inclined from said upper and lower end portions to said central portion.