ABSTRACTA torque multiplier subsea tool for setting a seal between acasing hanger and a subsea wellhead includes a mandrel having asun gear with axial elongate teeth. An outer barrel is disposedaround the mandrel forming an annulus therebetween. A planetarygear assembly is disposed in the annulus between the barrel andthe sun gear to transmit to the barrel a torque which is higherin magnitude than that applied to the mandrel. A connector bodydisposed around the mandrel, below the planetary gear assembly,includes radially movable dogs for engaging the casing hanger.The barrel engages the sealing assembly and transmits the in-creased torque thereto to advance the sealing assembly downwardsand to set the seal. The mandrel advances downwards with thesealing assembly and releases the dogs from the casing hanger.An emergency release mechanism is provided to advance the mandreldownwards to release the dogs in the event such downward movementis prevented during normal seal setting operation.
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