| 摘要 |
A floating roof for use in a storage tank having an upstanding substantially cylindrical seal comprises a plurality of individually buoyant inner and outer roof sections, each including a continuous peripheral wall therearound and a bottom wall closing the area defined by the peripheral wall, the roof sections being arranged substantially to fill the area defined by the associated shell with the peripheral walls of adjacent roof sections abutting against one another, the abutting peripheral wall portions of adjacent roof sections being secured together by interlocking pairs of lugs on each section; the lugs are formed by on-site die punching of the abutting peripheral wall portions resulting in the pair of lugs of one section over-lapping the corresponding pair of lugs on the abutting section, the lugs of each pair then being bent toward each other for interlocking the overlapping pairs.
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