| 摘要 |
Apparatus for removing the frozen head of an annular type blow-out preventer, wherein an annular frame is mounted over the threadedly attached head leaving a central, top portion of the blow-out preventer head exposed to receive a torque arm adapted to be secured to the preventer head, torque being applied to the torque arm from hydraulic power assemblies mounted on the frame for breaking the threaded connection between said preventer head and body.
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