| 摘要 |
PURPOSE:To improve mechanical strength of a multi-layer cylinder by lapping plural different length metal plates each other, forming a laminated plate obtained by welding ends of the plates into a cylinder, inserting a metal plate between both mating faces, and welding the metal plates to fix. CONSTITUTION:Plural metal plates 1A, 1B, and 1C are lapped in order of their length so that the end of the plates tiers and an integrally laminated metal plate 2 is obtained by welding around the ends. The laminated metal plate 2 is rounded into a cylinder with the metal plate 1A inside. The mating faces of the plate 1A are welded 6 to form a cylinder of the 1st layer. An integrated member of an inserting metal plate 1b with a leakage detecting tube 4 is inserted into a facing part of the 2nd layer, and the end of the plate 1B and the mating face of the inserting plate 1b are welded. An inserting metal plate 1C is put on the leakage detecting tube 4 and the mating faces of the 3rd layer are welded integrally. By this method, the interface between every two layers is made to be in a close contact condition, so that the pressure proof performance of the multi-layer cylinder is improved.
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