Invention Grant
US4549580A Plug assembly for offshore platforms 失效
海上平台插头总成

Plug assembly for offshore platforms
Abstract:
An improved reusable plug for sealing hollow cylindrical members, in particular, the jacket legs, pile sleeves, pilings, conductor pipes, or other similar members of offshore structures, the improved reusable plug comprising a packer mandrel assembly, packer member, packer setting assembly, dog locking sleeve assembly, pressure equalization plug assembly, and overshot retrieving assembly.
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