Abstract: An assembly of vessel and turret is provided. The vessel comprises a moonpool and the turret is mounted in said moonpool for a rotation around a turret axis relative to the vessel. The turret comprises a chain table to which mooring lines are connected and through which risers are conveyed, and a turret table vertically spaced above the chain table and connected therewith by a connecting structure. The connecting structure comprises at least three vertically extending columns positioned such at angular intervals that radially outer sides of the columns are located in the vicinity of an outer circumference of the turret. The risers are conveyed through the chain table in such a way that riser sections above the chain table extend towards the turret table within an internal space of the columns.

Abstract: An assembly of vessel and turret is provided. The vessel comprises a moonpool and the turret is mounted in said moonpool for a rotation around a turret axis relative to the vessel. The turret comprises a chain table to which mooring lines are connected and through which risers are conveyed, and a turret table vertically spaced above the chain table and connected therewith by a connecting structure. The connecting structure comprises at least three vertically extending columns positioned such at angular intervals that radially outer sides of the columns are located in the vicinity of an outer circumference of the turret. The risers are conveyed through the chain table in such a way that riser sections above the chain table extend towards the turret table within an internal space of the columns.

Abstract: A turret assembly for a vessel comprises a moonpool defined in the vessel and a turret structure rotatably mounted in said moonpool. The turret structure comprises a turret table which by means of a main bearing is rotatably mounted in said moonpool and a hollow turret shaft defined by a surrounding shaft wall, which turret shaft has an upper shaft end connected to the turret table, a substantially cylindrical shaft part that extends downwardly from the turret table and a lower shaft end provided with means intended for cooperation with a lower bearing. The shaft wall of the upper shaft end comprises a widened part surrounding the cylindrical shaft part and defines a circumferential crest, wherein the shaft wall of the upper shaft end, starting from said circumferential crest, extends downwardly towards a position where the upper shaft end is connected to the turret table.

Abstract: A turret assembly for a vessel comprises a moonpool defined in the vessel and a turret structure rotatably mounted in said moonpool. The turret structure comprises a turret table which by means of a main bearing is rotatably mounted in said moonpool and a hollow turret shaft defined by a surrounding shaft wall, which turret shaft has an upper shaft end connected to the turret table, a substantially cylindrical shaft part that extends downwardly from the turret table and a lower shaft end provided with means intended for cooperation with a lower bearing. The shaft wall of the upper shaft end comprises a widened part surrounding the cylindrical shaft part and defines a circumferential crest, wherein the shaft wall of the upper shaft end, starting from said circumferential crest, extends downwardly towards a position where the upper shaft end is connected to the turret table.

Abstract: An assembly of two concentric parts and a bearing between the parts is provided with an inner bearing ring, an outer bearing ring, axial rollers and radial rollers. A first bearing ring is attached to a first concentric part in a manner for maximally limiting a radial distortion thereof and a second concentric part is connected to the second bearing ring at an engagement location. The second concentric part has a load support member which is connected to the second bearing ring such that the vertical load introduced into the second bearing ring by the load support member extends through the axial rollers without causing a moment around the axial rollers, and wherein the second concentric part indirectly or directly engages the second bearing ring in such a manner that only radial loads and substantially no axial loads are introduced at the at least one engagement position.

Abstract: An assembly of two concentric parts and a bearing between said parts is provided with an inner bearing ring, an outer bearing ring, axial rollers and radial rollers. A first bearing ring is attached to a first concentric part in a manner for maximally limiting a radial distortion thereof and a second concentric part is connected to the second bearing ring at an engagement location. The second concentric part has a load support member which is connected to the second bearing ring such that the vertical load introduced into said second bearing ring by said load support member extends through the axial rollers without causing a moment around said axial rollers, and wherein the second concentric part indirectly or directly engages the second bearing ring in such a manner that only radial loads and substantially no axial loads are introduced at said at least one engagement position.

Abstract: In a mooring assembly for a vessel, comprising a moonpool defined in the vessel, a turret is rotatably mounted within the moonpool with an upper main bearing for transmitting horizontal and vertical loads between the vessel and turret and with a lower secondary bearing for substantially transmitting horizontal loads between the vessel and the turret. Mooring lines are attached to the lower region of the turret that comprises a number of circumferentially spaced torsion box like torsion members each extending substantially vertically. The torsion members resist bending in a circumferential direction that is greater than in a radial direction. The lower secondary bearing is defined by outwardly facing bearing members attached to said torsion members and an inwardly facing bearing ring attached to the moonpool. In a situation in which a torsion member is not loaded horizontally by a respective mooring line its bearing member does not engage the ring.

Abstract: In a mooring assembly for a vessel, comprising a moonpool defined in the vessel, a turret is rotatably mounted within the moonpool with an upper main bearing for transmitting horizontal and vertical loads between the vessel and turret and with a lower secondary bearing for substantially transmitting horizontal loads between the vessel and the turret. Mooring lines are attached to the lower region of the turret that comprises a number of circumferentially spaced torsion box like torsion members each extending substantially vertically. The torsion members resist bending in a circumferential direction that is greater than in a radial direction. The lower secondary bearing is defined by outwardly facing bearing members attached to said torsion members and an inwardly facing bearing ring attached to the moonpool. In a situation in which a torsion member is not loaded horizontally by a respective mooring line its bearing member does not engage the ring.

Abstract: A disconnectable mooring system for a vessel is presented, comprising a moonpool in the vessel, a turret structure mounted for a rotation in said moonpool and a buoy member having a plurality of passages each adapted to receive a riser. The turret structure has a lower end comprising a buoy receptacle for detachably receiving the buoy member, wherein the mooring system further comprises a plurality of mooring lines for transmitting mooring forces and each have a lower end and an upper end connected to the seabed and the buoy member, respectively. The mooring lines each comprise a first section which in a disconnectable manner is connected to the turret structure and a second section connected to the first section at a coupling point and connected to the buoy member. Also methods for disconnecting and reconnecting such a mooring system are presented.

Abstract: A disconnectable mooring system for a vessel is presented, comprising a moonpool in the vessel, a turret structure mounted for a rotation in said moonpool and a buoy member having a plurality of passages each adapted to receive a riser. The turret structure has a lower end comprising a buoy receptacle for detachably receiving the buoy member, wherein the mooring system further comprises a plurality of mooring lines for transmitting mooring forces and each have a lower end and an upper end connected to the seabed and the buoy member, respectively. The mooring lines each comprise a first section which in a disconnectable manner is connected to the turret structure and a second section connected to the first section at a coupling point and connected to the buoy member. Also methods for disconnecting and reconnecting such a mooring system are presented.