| 摘要 |
Method and apparatus for producing a large diameter storage tank from strip metal. The strip is fed to a support assembly arranged circularly on a base and which supports the strip vertically in a helical path. The upper edge of the strip is bent into a right-angled bend which is aligned with the unbent lower edge of the helical turn immediately thereabove. The two aligned edges are welded together. The right-angled bend produces a helical outwardly extending structural fin on the outside of the storage tank.
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