Hot isostatic pressing apparatus

A hot isostatic pressing apparatus for subjecting workpieces to hot isostatic pressing with use of a pressure medium gas, said apparatus comprising:

• a high-pressure vessel having a lower end opening and a removable lower lid, which can close said lower end opening;
• a treatment chamber provided within said high-pressure vessel to heat and press workpieces;
• a heat insulating structure which covers said treatment chamber sideways and from above, wherein said heat insulating structure is movable independently of said lower lid;
• a workpiece support mounted to said heat insulating structure so as to move with said heat insulating structure and independently of said lower lid;
• a base heater disposed below said treatment chamber to heat a pressure medium gas;
• and
• a fan disposed below said treatment chamber to supply the pressure medium gas in a heated state into the treatment chamber;
• wherein said heat insulating structure and workpieces can be taken out together from said high-pressure vessel and can be conveyed together separately from said lower lid.