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1 Introduction to the New Technology Double-layered spherical vessels have the features of high load-bearing capacity, good safety and convenience for taking measures of heat insulation, therefore they have been used for storage of cold products such as liquid hydrogen and liquid oxygen. But spherical vessels are usually manufactured by using stamping technology and difficult to build, thus their application is limited seriously. Just for these problems, the integrally hydroforming technology for double-layered spherical vessels
1 Introduction to the New Technology Double-layered spherical vessels have the features of high load-bearing capacity, good safety and convenience for taking measures of heat insulation, so they have been used for storage of cold products such as liquid hydrogen and liquid oxygen. But spherical vessels are usually manufactured by using stamping technology and difficult to build, thus their application is limited seriously. Just for these problems, the integrally hydroforming technology for double-layered spherical vessels