EP3414154B1 - Slim turret - Google Patents

Slim turret Download PDF

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Publication number
EP3414154B1
EP3414154B1 EP17704002.9A EP17704002A EP3414154B1 EP 3414154 B1 EP3414154 B1 EP 3414154B1 EP 17704002 A EP17704002 A EP 17704002A EP 3414154 B1 EP3414154 B1 EP 3414154B1
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EP
European Patent Office
Prior art keywords
turret
vessel
unit
assembly
supporting structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17704002.9A
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German (de)
English (en)
French (fr)
Other versions
EP3414154A1 (en
Inventor
Arne Smedal
Kåre SYVERTSEN
Jan Vidar Aarsnes
Ragnar THUNES
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Cefront Technology As
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Cefront Technology As
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Publication of EP3414154A1 publication Critical patent/EP3414154A1/en
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Publication of EP3414154B1 publication Critical patent/EP3414154B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/507—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/04—Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • B63B21/10—Fairleads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/02—Buoys specially adapted for mooring a vessel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/30—Arrangement of ship-based loading or unloading equipment for transfer at sea between ships or between ships and off-shore structures
    • B63B27/34—Arrangement of ship-based loading or unloading equipment for transfer at sea between ships or between ships and off-shore structures using pipe-lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B2003/147—Moon-pools, e.g. for offshore drilling vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/02—Buoys specially adapted for mooring a vessel
    • B63B2022/028—Buoys specially adapted for mooring a vessel submerged, e.g. fitting into ship-borne counterpart with or without rotatable turret, or being releasably connected to moored vessel

Definitions

  • the present invention relates to a turret assembly for mooring a storage and production vessel to a seabed and for transferring fluids from a subsea flowline to the vessel, wherein the turret assembly comprises notably a geostationary inner turret unit displaying at least one through-going channel extending axially along a longitudinal center axis of the inner turret unit.
  • the present invention also relates to a vessel comprising said turret and a method for installing said turret onto such a vessel.
  • a turret The function of a turret is to moor a weathervaning vessel to a seabed without creating excessive forces on the mooring lines. This is achieved by use of a swivel and bearings that keeps the turret geostationary during vessel rotations. Turrets on storage or production vessels must also provide space for pipelines extending along an axial center of the turret. The swivel enables the transfer of fluid flows. communication signals, hydraulics and any power between the geostationary turret and the weathervaning vessel.
  • patent publication GB1189758A discloses a conventional turret extending between the deck and the keel of a vessel. The turret is kept geostationary by a deck positioned rotatable table.
  • patent publication WO 98/56650 discloses a more recent example of a turret where a relatively small sized turret is located near the keel level of the vessel.
  • the rotatable chain table is attached below the vessel. In this way the chain table can adequately take up bending moments exerted by e.g. the mooring chains.
  • the arrangement also enables easy removal of the lower part of the turret wall from the vessel in order to transform the vessel back to a transport tanker.
  • EP 1886914 A1 discloses a vessel with a mooring system comprising a turret anchored to the seabed and a turret casing being part of the vessel, wherein the turret and turret casing are interconnected by a connecting element comprising a bearing arrangement.
  • the connecting element has a first end connected to the turret casing and an opposite second end connected to the turret.
  • the connection between the connecting element and the vessel has a symmetric arrangement of the fixing means.
  • patent publication US 5782197 A disclosing a turret device for anchoring a vessel to the seabed and to transport fluids through pipes
  • patent publication WO 93/24733 A1 disclosing a system for use in offshore petroleum production comprising a submerged buoy
  • patent publication EP 2778041 A1 disclosing an assembly for transferring fluids between a vessel and a turret structure mounted on the vessel.
  • none of these publications describes a turret support structure rotationally surrounding the entire inner turret unit.
  • a turret of conventional design typically has a bearing integrated into the vessel structure with a diameter equal to the largest diameter of the turret construction.
  • Pipes for fluid flow, signal, etc., as well as mooring lines, must be placed within these bearings.
  • An example of such a design is disclosed in WO 2015/063262 .
  • the forces that generate moments responsible for limiting the rotation of the turret construction are therefore mainly due to frictional forces within the axial bearing.
  • This rotational moment is proportional to the size of the force, the friction coefficient and the bearing diameter. If sliding bearings are used the moments set up by mooring lines may not be sufficient for turning the turret. Active rotation of the turret may then be required, i.e. by turret rotating motors.
  • a complete turret assembly i.e. a turret construction comprising all components necessary to establish a satisfactory mooring of a storage or production vessel, may be installed onto the vessel while being in dock.
  • an object of the invention is to provide a turret assembly for mooring a production vessel to a seabed and for transferring fluids from a subsea flowline to the vessel, which mitigate at least some of the above mentioned short-comings.
  • a particular object of the invention is to provide a turret assembly that is not significantly affected by any deformation of the vessel hull.
  • a second particular object of the invention is to provide a turret assembly that may accept less severe requirements for tolerance, flexibility, etc., than conventional turret assemblies.
  • a third particular object of the invention it to enable turret rotation at low friction moments.
  • a fourth particular object of the invention is to provide a turret assembly that has a size and a shape that allows mounting of the turret assembly when the vessel in question is in dock.
  • the present invention relates to a turret assembly suitable for mooring a production vessel to a seabed and suitable for transferring fluids from a subsea flowline to the vessel.
  • the turret assembly comprises a geostationary inner turret unit displaying at least one through-going channel extending axially along a longitudinal axis of the inner turret unit, a turret supporting structure rotationally surrounding the inner turret unit and a bearing arrangement situated between the inner turret unit and the turret supporting structure allowing the inner turret unit to rotate relative to the turret supporting structure and to transfer forces from the inner turret unit to the turret supporting structure.
  • the turret supporting structure furthermore comprises fixing means configured to fix the turret supporting structure to a hull structure of the vessel in such a way that, in use, any deformation force acting on a hull of the vessel has insignificant impact on the turret assembly.
  • Said fixation should preferably be a rigid fixation.
  • the bearing arrangement between the geostationary inner turret unit and the turret supporting structure permits the vessel to pivot around the inner turret in response to changes in wind, waves, and currents without disturbing any seabed extending equipment being guided through the through-going channels, for example risers, cables, umbilicals, etc.
  • the inventive turret assembly may optionally be equipped with auxiliary equipment's such as bending limiters for ensuring an operation effective guiding of the seabed extending equipment through the turret assembly from the vessel to the seabed at operation site.
  • the bearing arrangement preferably comprises at least one sliding bearing.
  • the rotational axis of the turret supporting structure is concurrent with the longitudinal center axis of the geostationary inner turret unit.
  • an exterior contact surface of the turret supporting structure is designed such that, when installed in a vertical extending shaft of a vessel, both horizontal and vertical forces are transferred between the hull of the vessel and the turret supporting structure.
  • An example of such a designed may be a wedge-shaped contact surface.
  • the fixing means is, relative to the longitudinal center axis of the inner turret unit, located at or above the level of the upper bearing.
  • the fixing means is arranged asymmetric relative to a longitudinal (vertical) center plane of the inner turret unit.
  • the fixing means may be fixed at the exterior of the turret supporting structure at one side of the longitudinal center plane running through the longitudinal axis and directed perpendicular to a direction of motion of the vessel during use and/or at one side of the longitudinal center plane running through the longitudinal axis and directed parallel to the direction of motion of the vessel during use.
  • the bearings arrangements comprising an upper bearing situated at an upper part of the turret supporting structure, and a lower bearing situated at a lower part of the turret supporting structure having a larger diameter than the diameter of the upper bearing.
  • the lower bearing(s) has/have a diameter that allows chain cables to pass at the inside of the bearing surface(s), for example the diameter of at conventional turret assembly. Since the movements of the vessel causes large variations of the horizontal load that accumulates in the lower radial bearing(s), the frictional forces in this / these bearing(s) do not have large impact on the turret rotation relative to the vessel. Typically, the rotation takes place when the horizontal loads are small.
  • the upper bearing has a diameter that should accommodate guide tubes 14 for seabed extending equipment 16, but not including mooring equipment 8,11 such as chain cables 8.
  • the diameter of the upper bearing may be less than 75 % of the diameter of the lower bearing, more preferably less than 70 %, even more preferably less than 65 %, even more preferably less than 60 %, for example 50%. Even smaller diameters of the upper bearings compared to the lower bearing are foreseeable.
  • the upper part of the turret supporting structure is herein defined as the part constituting less than 20 % of the total longitudinal length of the structure measured from the structure's top, for example approximately the vertical extension of the transverse beam at the structure's upper end.
  • the lower part is defined as the part constituting less than 40 % of the total longitudinal length of the structure measured from the structure's base, for example from the base up to the start of the narrowing of the diameter of the inner turret unit. Any other parts of the turret supporting structure may be defined as the structure's mid part.
  • the exterior contact surfaces of the turret supporting structure are, relative to the longitudinal center axis, located within the lower part, at or above the lower bearings.
  • the upper bearing comprises an axial upper bearing accommodating loads predominantly parallel to the longitudinal center axis of the turret assembly and a radial upper bearing accommodating loads predominantly perpendicular to the longitudinal center axis of the turret assembly.
  • the lower bearing comprises a radial lower bearing accommodating loads predominantly perpendicular to the longitudinal center axis of the turret assembly.
  • the turret assembly comprises at least one chain cable extending at least partly between the inner turret unit and the turret supporting structure, wherein the end of the at least one chain cable is fixed at a position situated between the upper bearings and the lower bearing.
  • the end of the at least one chain cable is guided through at least one anchor winch, where said at least one anchor winch is fixed to the inner turret unit below the upper bearing.
  • the end may be fixed to a respective chain locker of the inner turret unit.
  • the turret assembly further comprises at least one pivotable fairlead for guiding and control of the chain cable.
  • the at least one pivotable fairlead is fixed at a position located below the lower bearing of the inner turret unit in order to ensure that the chain cable may be pulled in/out and may rotate during operation at varying loads and load directions.
  • the fairleads are further designed such that the total radial diameter set up by the at least one fairlead and the inner turret unit is changeable between a radial diameter being larger than the inner diameter of the base of the turret supporting structure and a radial diameter being smaller than the inner diameter of the base of the turret supporting structure. In this way the turret assembly (including the fairleads) may be arranged fully into the vessel's shaft during transport and be expanded during mooring.
  • Conventional fairleads may be used for the inventive turret assembly.
  • conventional fairleads one may use alternative solutions such as fairlead arrangements for locking chains at the outside of the fairlead, or where the fairlead has been replaced with a rotating arm having integrated chain stoppers.
  • the two latter alternatives may be particularly useful for the chain cables since they will experience a significantly reduces out-of-plane bending, and at the same time avoid being situated in the splash zone where there are higher requirements in respect of corrosion rate.
  • the invention also concerns a production vessel suitable for producing hydrocarbons from an offshore reservoir.
  • the production vessel comprises a hull displaying at least one well or shaft extending vertically within the hull.
  • the well is open in at least at its lower end.
  • the vessel further comprises a turret assembly in accordance with any one of features mentioned above which is adapted to, and mounted within, the well.
  • the invention also concerns a method suitable for mooring a vessel to a seabed.
  • the method comprises the steps of prefabricating, while in dock, a turret assembly comprising a geostationary inner turret unit displaying at least one through-going channel extending mainly parallel to a longitudinal center axis of the inner turret unit and a turret supporting structure rotationally surrounding the inner turret unit, transferring the prefabricated turret assembly into a well or shaft located within the vessel such that a base of the inner turret unit is situated in a transport position at or above a keel or base of the vessel, moving the vessel to an offshore mooring site, vertically lowering the prefabricated turret assembly to a mooring position where the base of the inner turret unit is located below the keel of the vessel and locking the prefabricated turret assembly into the mooring position.
  • the method further comprises the step of unlocking the prefabricated turret assembly from its mooring position, vertically raising the prefabricated turret assembly from its mooring position to the transport position prior to moving the vessel from the offshore mooring site.
  • the step of prefabricating includes mounting a plurality of fairleads at or near the base of the inner turret unit, the plurality of fairleads being pivotably mounted near the base enabling pivoting of the fairleads towards the exterior wall of inner turret unit.
  • the term 'near the base" is defined as the part constituting less than 20 % of the total longitudinal length of the inner turret unit measured from the base and in relation to the lowest part of each fairleads. For example, the lowest part of each fairlead may be flush with the base of the inner turret unit.
  • the prefabricated turret assembly mentioned in the method is in accordance with any of the features mentioned above.
  • the above mentioned turret assembly has thus a configuration that reduces the effect of deformations in the vessel hull, as well as reducing the required rotational moment in order to rotate the relevant part of the turret assembly.
  • fairlead is in the following referred to a device for guiding a chain line, rope or cable around an object, out of the way and/or to hinder lateral movements.
  • the prior art fairlead may be a separate piece of hardware or simply a hole into a structure.
  • the fairlead constituting part of the inventive turret assembly is a separate piece of hardware that may rotate during operation.
  • upper part and lower part of the turret assembly is referred the upper (deck) and lower (keel) parts of a vessel.
  • FIG. 1 shows an embodiment of a turret 1 for mooring a production vessel to a seabed (not shown).
  • the turret 1 comprises a geostationary unit 5 comprising guide tubes 14 which extends in the direction of the unit's 5 (and thus turret's) center axis 15.
  • the plurality of guide tubes 14 are configured to guide risers, umbilical's or cables 16 through the axial length of the turret 1 (see figure 9 ).
  • the vessel 100 may pivot around the geostationary unit 5 in response to changes in wind, waves, and currents without disturbing either the risers 16 or the mooring lines 8,11.
  • the inventive turret 1 further comprises a weathervaning unit 6 that rotationally surrounds the axial circumference of the geostationary unit 5 and which is fixed to the geostationary unit 5 and to its surrounding hull / vessel structure 110 by bearings 2,2',3 and by fixing devices 7a,7b, respectively.
  • the positions of these fixing devices 7a,7b are arranged asymmetrically around the central axis 15 of the turret 1. More specifically, the four fixing devices 7a,7b in figure 4 rigidly connects the weathervaning unit 6 to its surrounding hull 110 at one radial side of the center axis 15 only, for example at one side of the center axis 15 in the longitudinal direction of the vessel 100.
  • any distortion / deformation of the hull 110 will not be transmitted to the weathervaning unit 6, but instead cause a displacement of the weathervaning unit 6 in direction away from the fixing devices 7a,7b that avoids destructive built-up of stresses within the turret 1. I.e., any hull distortions have insignificant impact on the operation of the turret 1.
  • auxiliary equipment such as bending limiters. Such equipment may be mounted prior to setting up the vessel at the production field.
  • the turret 1 comprises a small diameter upper bearing 2,2' situated at an upper part of the weathervaning unit 6, and a large diameter lower bearing 3 (i.e. larger than the upper bearings 2,2') situated at a lower part of the weathervaning unit 6.
  • the upper bearing 2,2' may comprise both an axial upper bearing 2 and a radial upper bearing 2', while the lower bearing 3 may comprise a radial lower bearing 3 only.
  • Figure 7 also shows a plurality of chain cables 8 being connected to respective anchor winches 10.
  • the anchor winches 10 are fixed to the geostationary unit 5 below the upper bearings 2,2'.
  • Each of the chain cables 8 are guided through respective chain stoppers 9 situated on the geostationary unit 5, in figure 1 seen supported on a projecting block 18 below the upper bearings 2,2'.
  • the chain cables 8 are pulled in by the dedicated anchor winches 10. This arrangement renders pull-in of mooring lines 8,11 possible without forcing the vessel 100 to keep a fixed heading during the operation.
  • the anchor winches 10 may be arranged on a deck 108, for example at the same level as the upper bearing(s) 2,2', or arranged on or above the main deck 108 of the vessel 100.
  • Anchor winches 10 may be installed for every group of anchor lines 8,11 and/or for each of the anchor lines 8,11. If only one anchor winch 10 for each anchor line 8,11 group is used, a chain cable 8 will after pull-in be locked into position by the chain stopper 9 and the chain cable 8 is cut of. The end of the chain 8 situated above the chain stopper 9 may advantageously be suspended in a chain hang-off padeye placed on the geostationary unit 5. By use of one anchor winch 10 per anchor line 8,11 it is no longer necessary to cut the chain cable 8.
  • the turret 1 further comprises a plurality of fairleads 13 into which the chain cables 8 are guided.
  • the pivotable fairleads 13 are fixed to the lower end of the geostationary unit 5 below the lower bearing 3 such that the fairlead's outermost radial position (that is, in the outermost position in the direction perpendicular to the center axis 15) may be switched between positions outside and inside the weathervaning unit 6.
  • the latter positions of the fairleads 13, pivoted to have outermost radial positions laying within the smallest cavity diameter of the weathervaning unit 6, are useful when the turret 1 is to be lifted into the vessel 100, either in parts or in it's entirely, for example during transport from docking to production site.
  • Figures 2 (a) and (b) show cross section views of the weathervaning unit 6 viewed from the side (a) and at section C-C (b), respectively.
  • Three fixing devices 7a,7b are shown, arranged to form the mentioned asymmetric configuration.
  • a plurality of guide tubes 14 are seen extending through the geostationary unit 5 with an angle from the center axis 15 slightly larger than zero, for example between 1-10°.
  • the tubes 14 are configured to contain various equipment 16 intended to be guided down to the seabed during operation, for example risers, umbilical's or cables (see figure 9 ). Due to the bearings 2,2',3 between the geostationary unit 5 and the weathervaning unit 6, the vessel 100 is allowed to pivot around the geostationary unit 5 in response to changes in wind, waves, and currents without disturbing above mentioned equipment 16 or the mooring lines 8,11.
  • FIGs 5 and 6 shows an embodiment where the turret 1 is arranged in a transport position inside a dedicated vertical extending shaft 4 within a hull 110 of a docked production vessel 100 comprising a vessel deck 108, a keel 102, derrick 104 with winches and a winch locker, an access trunk 107 (to access mid part of the turret 1 from the deck 108) and thrusters 103.
  • the vessel 100 is situated on supporting blocks 101 on the docking base 105.
  • a water line of the vessel 100 is indicated with reference 109.
  • a plurality of fairleads 13 are shown pivotably fixed to the lower end 6' of the turret 1.
  • FIG. 5 and 6 shows a particular fairlead configuration at a vertically retracted position seen from the side and from below, respectively.
  • the vertical displacement of the turret 1 is achieved by use of the derrick 104.
  • Also shown in figure 6 are six through-going channels 14 for guiding seabed extending equipment 16 such as risers, umbilical's or cables (se figure 9 ).
  • Figure 7-9 shows the turret 1 arranged inside the dedicated shaft 4 of a production vessel 100 submerged in water 109, and where the turret 1 is in an operational position, i.e. vertically lowered by the derrick 104 to a level where the fairleads 13 may be pivoted to such a degree that their diameter exceeds the outer diameter of the shaft's 4 lowest part.
  • an operational position i.e. vertically lowered by the derrick 104 to a level where the fairleads 13 may be pivoted to such a degree that their diameter exceeds the outer diameter of the shaft's 4 lowest part.
  • any seabed extending equipment 16 may be guided through the plurality of guide tubes 14 and any seabed extending mooring lines 8,11 may be arranged as seen for conventional turrets.
  • a total of six guide tubes and a total of 12 mooring lines are illustrated as an example.
  • Each mooring lines 8,11 are in the embodiment of figure 8 composed of a chain cable 8 extending from the anchor winch to a position below its respective fairlead 13 and an anchor line 11 (for example made of polyester) extending from the submerged end of the chain cable 8 to the seabed.
  • Figure 9 shows in perspective the turret 1 in its operational position within the vessel 100 and with a swivel arrangement 20 enabling the introduction of fluid into some or all of the seabed extending equipment 16 during vessel rotation / weathervaning.
  • the axial and radial bearings 2,2' are transferring forces from the geostationary unit 5 to the weathervaning unit 6 (and vice versa).
  • fixing devices 7a,7b situated between the weathervaning unit 6 and the vessel structure / hull 110 are transferring the forces on to the vessel structure 110.
  • the fixing devices 7a,7b preferably set up a rigid fixing, creating a "single" moveable unit.
  • the lower part 6' of the weathervaning unit 6 has contact faces that are configured such that both horizontal and vertical forces may be transferred to the vessel structure 110.
  • the fastening point at the upper part 6" of the weathervaning unit 6 is configured such that the deformation of the vessel structure 110 is not transferred to the turret 1.
  • any deformation force acting on the vessel structure 110 has insignificant impact on the turret 1.
  • This feature is herein achieved by fastening only one side of the upper part 6" of the weathervaning unit 6 to the vessel structure 110.
  • the fastening of the weathervaning unit 6 should be arranged to the side of the turret 1 having a component dominantly in the vessel's 100 direction of motion.
  • the vessel 100 experiences transverse deformations it may be beneficial to fasten the weathervaning unit 6 with a component dominantly in the vessel's 100 transverse direction.
  • the diameter of the upper axial bearing(s) 2 is significantly reduced compared to a conventional turret. This diameter reduction is achieved by letting only seabed extending equipment 16 such as risers and/or umbilicals pass inside the upper axial bearing(s) 2. In this way the diameters of both the upper axial bearing(s) 2 and the upper radial bearing(s) 2' will be reduced, thereby lowering the friction moments. This again will significantly simplify the demands for bearing tolerances etc.
  • the bearing surface(s) of the upper axial bearing(s) 2 and the upper radial bearing(s) 2' may be locked to the weathervaning unit 6, for example at or near its rim. Since the fixing(s) is/are only on one side (in the longitudinal and/or transverse direction) the deformations from the vessel 100 will not be transferred to the bearing surfaces. This ensures that the bearings 2,2',3 will have an optimum contact face being at least close to independent of outer strains.
  • the main (or even the entire) mounting procedure may take place when the vessel 100 is still in dock.
  • the vessel 100 By suspending part or the entire turret 1 in a position where the lower part of the turret 1 are located in line with, or above, the keel 102, conventional docking is possible where the vessel 100 is supported on supporting blocks 101 having a conventional height.
  • at least part of the turret 1 may be lowered and locked into the operational / mooring position. In an equivalent way the at least part of the turret 1 may be lifted up to a transport position prior to further transport and/or docking.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Jib Cranes (AREA)
  • Vending Machines For Individual Products (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
EP17704002.9A 2016-02-10 2017-02-09 Slim turret Active EP3414154B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20160222A NO341161B1 (en) 2016-02-10 2016-02-10 Slim turret
PCT/EP2017/052856 WO2017137492A1 (en) 2016-02-10 2017-02-09 Slim turret

Publications (2)

Publication Number Publication Date
EP3414154A1 EP3414154A1 (en) 2018-12-19
EP3414154B1 true EP3414154B1 (en) 2019-10-09

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EP (1) EP3414154B1 (no)
CN (1) CN108602548B (no)
NO (1) NO341161B1 (no)
WO (1) WO2017137492A1 (no)

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CN111152899B (zh) * 2020-03-05 2022-02-08 招商局重工（江苏）有限公司 利用半潜驳船和浮吊放平3000吨浮吊主臂架方法

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NO20160222A1 (en) 2017-08-11
WO2017137492A1 (en) 2017-08-17
CN108602548B (zh) 2020-03-17
CN108602548A (zh) 2018-09-28
EP3414154A1 (en) 2018-12-19
NO341161B1 (en) 2017-09-04

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