Abstract: An improved detachable mooring system is disclosed of the kind including a rotatable turret mounted on the vessel and a buoyant spider buoy, secured by mooring legs to the sea floor, which may be selectively connected by means of a hydraulic connector to the bottom of the turret. One improvement relates to apparatus for establishing pre-load tension between a collet flange hub of the spider buoy and a hydraulic powered connector at the bottom of the turret. Another improvement relates to apparatus for remotely sensing the level of pre-load tension in the connector. Another improvement relates to a self-aligning support arrangement for supporting the collet connector to the bottom of the turret. Another improvement relates to an axial load bearing arrangement for supporting the turret with respect to the vessel.

Abstract: A rotatable swivel comprising a swivel body, a ball bearing assembly, and a primary upper seal axially offset from a primary lower seal for sealing a conduit chamber is disclosed. Pressurization of the conduit chamber of the swivel in cooperation with the differential axial offset of the primary seals creates axial pre-loading of the swivel operably aiding in the sealing of the conduit chamber and maintaining the concentricity of the bearing assembly between a rotatable outer ring and a stationary inner ring and providing wear compensation for the swivel. Secondary upper and lower seals are disclosed whereby if the primary seals fail to retain pressure in the conduit chamber, the respective secondary seal maintains the initial axial loading of the failed primary seal.