METHOD FOR MANUFACTURING PRESSURE VESSEL

摘要

PROBLEM TO BE SOLVED: To make it possible to suppress the cost of manufacturing facilities low as well as sufficiently reducing and removing a residual stress even when a pressure vessel having a large-sized pressure chamber is manufactured, and further, to set the dimensions within the pressure vessel with high precision.SOLUTION: A method for manufacturing a pressure vessel includes: an intermediate product forming step P2 of forming an intermediate product in a shape corresponding to a final shape of the pressure vessel; a preliminary pressure applying step P3 of plastically deforming the intermediate product by applying a preliminary pressure larger than a withstanding pressure required as a pressure chamber in the pressure vessel in the final shape into the pressure chamber in the intermediate product; a finish machining step P4 of finishing the intermediate product after the preliminary pressure is applied thereto in the preliminary pressure applying step into the final shape by machining it; and a withstanding pressure test step P5 of performing a withstanding pressure test to apply a withstanding pressure into the pressure chamber of the pressure vessel in the final shape subjected to finish machining.