CA2778285A1 - Method for disconnecting a buoy from a vessel and device for use therewith - Google Patents
Method for disconnecting a buoy from a vessel and device for use therewith Download PDFInfo
- Publication number
- CA2778285A1 CA2778285A1 CA2778285A CA2778285A CA2778285A1 CA 2778285 A1 CA2778285 A1 CA 2778285A1 CA 2778285 A CA2778285 A CA 2778285A CA 2778285 A CA2778285 A CA 2778285A CA 2778285 A1 CA2778285 A1 CA 2778285A1
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- Prior art keywords
- buoy
- mooring
- turret
- gripper means
- vessel
- 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.)
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Classifications
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- 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
- B63B21/508—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets connected to submerged buoy
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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)
- Catching Or Destruction (AREA)
Abstract
A method is provided for disconnecting a buoy from a turret in an arrangement with a vessel of the type comprising a turret mounted rotatably in the vessel and a buoy supporting risers which is lockable to and disconnectable from the turret. The arrangement further comprises mooring lines connecting the buoy with mooring points on the seabed and loading the buoy with mooring forces. Starting before disconnecting the buoy from the turret the mooring lines are manipulated such that at least during the moment of disconnecting the buoy from the turret the mooring forces are lowered or even substantially eliminated. A hold and release device comprises a housing with at least two distanced mooring line gripper means constructed such that an excess length of mooring line may be positioned therebetween and wherein at least one qripper means is adapted to be brought in a state disengaging the mooring line.
Description
Method for disconnecting a buoy from a vessel and device for use therewith The invention firstly relates to a method for dis-connecting a buoy from a turret in an arrangement with a vessel of the type comprising a turret mounted rotatably in the vessel and a buoy supporting risers which is lockable to and disconnectable from the turret, the arrangement further comprising mooring lines connecting the buoy with mooring points on the seabed and loading the buoy with mooring forces.
Vessels of the type referred to above are used in offshore oil and gas fields. Under normal circumstances the turret and buoy are kept in a connected state and the vessel is free to weathervane around the turret under influence of external factors, such as currents, waves and wind. When the need arises the buoy may be disconnected from the turret and the vessel may travel to a different gripper means. Actual disconnection and (re)connection activities can be achieved in relative limited time, whereas the moment of reconnection and sometimes the moment of disconnection is typically con-strained by external factors such as current and waves.
One example of a situation in which it may be re-quired to relocate the vessel is the occurrence of pack ice.
in view of the long time needed for reconnecting a buoy to a turret after a disconnect (and the concurrent loss of pro-duction time) one would Like to wa:iL as long as possible with the decision to disconnect. It might happen for example that the ice built up in the end does not. proceed as feared and that, consequently, a disconnect is not needed. The pre-sent combination of turret, buoy and mooring lines, however, does not allow to wait too long before taking a decision to disconnect. The pack ice pushing against the vessel creates enormous mooring forces in the mooring lines which, at the moment of disconnecting the buoy from the turret, act on the
Vessels of the type referred to above are used in offshore oil and gas fields. Under normal circumstances the turret and buoy are kept in a connected state and the vessel is free to weathervane around the turret under influence of external factors, such as currents, waves and wind. When the need arises the buoy may be disconnected from the turret and the vessel may travel to a different gripper means. Actual disconnection and (re)connection activities can be achieved in relative limited time, whereas the moment of reconnection and sometimes the moment of disconnection is typically con-strained by external factors such as current and waves.
One example of a situation in which it may be re-quired to relocate the vessel is the occurrence of pack ice.
in view of the long time needed for reconnecting a buoy to a turret after a disconnect (and the concurrent loss of pro-duction time) one would Like to wa:iL as long as possible with the decision to disconnect. It might happen for example that the ice built up in the end does not. proceed as feared and that, consequently, a disconnect is not needed. The pre-sent combination of turret, buoy and mooring lines, however, does not allow to wait too long before taking a decision to disconnect. The pack ice pushing against the vessel creates enormous mooring forces in the mooring lines which, at the moment of disconnecting the buoy from the turret, act on the
2 buoy i.n such a manner that it may be jammed in the turret and/or that uncontrolled movements of the buoy may occur with the risk of damaging parts of the construction, such as for example the risers.
Therefore it is an object of the present invention to provide an improved method for disconnecting a buoy from a turret.
in accordance with the present invention the method is characterised in that starting before disconnect-ing the buoy from the turret the mooring lines are manipu-lated such that at least during the moment of disconnecting the buoy from the turret the mooring forces are lowered or even substantially eliminated.
Lowering or even substantially eliminating the mooring forces enables to disconnect the buoy from the tur-ret. without adverse effects, even in situations in which initially high mooring forces are present in the mooring lines. This offers the possibility to delay the moment for deciding to disconnect until, for instance, maximum al iow-able loads are present.
In a preferred embodiment of the method according to the present invention the manipulation of the mooring lines comprises allowing the mooring lines to increase their effective length, which is defined as the ma ximu: distance between the buoy and a respective mooring point allowed by a mooring line. During such an increase the mooring forces temporarily are reduced/eliminated.
The increase of effective length may be achieved when., in accordance with a special embodiment, each mooring line extends through a hold and release device and is held thereby at two distanced gripper means with an excess length of mooring line between said two distanced gripper means, and wherein the mooring line for the increase of its effec-tive length is released at one gripper means for giving out the excess length of mooring line.
Therefore it is an object of the present invention to provide an improved method for disconnecting a buoy from a turret.
in accordance with the present invention the method is characterised in that starting before disconnect-ing the buoy from the turret the mooring lines are manipu-lated such that at least during the moment of disconnecting the buoy from the turret the mooring forces are lowered or even substantially eliminated.
Lowering or even substantially eliminating the mooring forces enables to disconnect the buoy from the tur-ret. without adverse effects, even in situations in which initially high mooring forces are present in the mooring lines. This offers the possibility to delay the moment for deciding to disconnect until, for instance, maximum al iow-able loads are present.
In a preferred embodiment of the method according to the present invention the manipulation of the mooring lines comprises allowing the mooring lines to increase their effective length, which is defined as the ma ximu: distance between the buoy and a respective mooring point allowed by a mooring line. During such an increase the mooring forces temporarily are reduced/eliminated.
The increase of effective length may be achieved when., in accordance with a special embodiment, each mooring line extends through a hold and release device and is held thereby at two distanced gripper means with an excess length of mooring line between said two distanced gripper means, and wherein the mooring line for the increase of its effec-tive length is released at one gripper means for giving out the excess length of mooring line.
3 The hold and release device may be anchored to the seabed, wherein the mooring line for the increase of its ef-fective length is released at the gripper means closest to the buoy. However, as an alternative the hold and release device may be mounted to the buoy, wherein the mooring line for the increase of its effective length is released at the gripper means closest to the mooring point.
Upon increasing the effective length of the moor-ing lines the mooring forces are reduced dramatically and the vessel temporarily is free to drift (for example along with drifting pack ice). This situation will last until the excess length of the mooring lines has been given out com-pletely. This excess length should be sufficiently long to provide a period of time with reduced mooring forces within which the disconnection between the buoy and turret may be achieved.
In accordance with vet another embodiment of the method according to the present invention the buoy comprises a first buoy part to which the mooring lines are connected and a second buoy part to which the risers are connected and which is provided with auxiliary mooring lines, wherein pre-vious to manipulating the mooring lines the second buoy part is released from and lowered relative to the first buoy part.
The main mooring forces occur in the mooring lines and the mooring forces in the auxiliary mooring lines are limited. Therefore the second buoy part (with risers) al-ready may be disconnected when the main, mooring forces still are present.
Further it is possible that the connection between the turret and buoy, when connected, is water tight and wherein previous to said manipulation of the mooring lines water is pumped into the turret above the buoy, and prefera-bly until a level above sea level.
Upon increasing the effective length of the moor-ing lines the mooring forces are reduced dramatically and the vessel temporarily is free to drift (for example along with drifting pack ice). This situation will last until the excess length of the mooring lines has been given out com-pletely. This excess length should be sufficiently long to provide a period of time with reduced mooring forces within which the disconnection between the buoy and turret may be achieved.
In accordance with vet another embodiment of the method according to the present invention the buoy comprises a first buoy part to which the mooring lines are connected and a second buoy part to which the risers are connected and which is provided with auxiliary mooring lines, wherein pre-vious to manipulating the mooring lines the second buoy part is released from and lowered relative to the first buoy part.
The main mooring forces occur in the mooring lines and the mooring forces in the auxiliary mooring lines are limited. Therefore the second buoy part (with risers) al-ready may be disconnected when the main, mooring forces still are present.
Further it is possible that the connection between the turret and buoy, when connected, is water tight and wherein previous to said manipulation of the mooring lines water is pumped into the turret above the buoy, and prefera-bly until a level above sea level.
4 This water generates a large downward force on the buoy assisting in moving the buoy downward after the discon-nection has occurred. Use of this water pressure accelerates the increase in distance between the buoy and the vessel and therefore limits the probability of the buoy and vessel to collide directly after separation from each other.
in a second aspect the invention relates to a hold and release device for use in a method for disconnecting a buoy from a turret in an arrangement with a vessel of the type comprising a turret mounted rotatably in the vessel and a buoy supporting risers which is lockable to and discon-r_ectable from the turret, the arrangement further comprising mooring lines connecting the buoy with mooring points on the seabed, said device comprising a housing with at least two distanced mooring line gripper means constructed such that an excess length of mooring line may be positioned therebe-tween and wherein at least one gripper means is adapted to be brought in a state disengaging the mooring line.
The gripper means may be constructed in many dif-ferent ways, for example as hydraulically operated grippers.
It should be kept in mind that the mooring forces are trans-mitted through these gripper means which therefore have to withstand large forces.
Depending on the specific embodiment the hold and release device may be adapted to be mounted to the buoy or may be adapted to be anchored to the sea bed.
Hereinafter the invention will be elucidated while referring to the drawing, in which:
Fig. 1. schematically shows a first embodiment of an assembly for carrying out a method according to the pre-sent invention, and Fig. 2 schematically shows a second embodiment of an assembly for carrying out a method according to the pre-sent invention.
Referring to figure 1 a vessel 1 is represented of the type comprising a turret 2 mounted rotatably (by bearings 3 and 4) in the vessel and a buoy 5 supporting ris-ers 6. In a manner known per se (e.g. by means of a tapering top section 'i) the buoy 5 is lockable to and disconnectable from the turret 2. There further are provided mooring lines 8 connecting the buoy 5 with mooring points 9 (anchors or piles) on the seabed 10 and loading the buoy with mooring forces.
A hold and release device 11 comprises a housing 12 with at least. two distanced mooring .line gripper means 13 and 14 (for example hydraulically operated grippers) con-structed such that an excess length 15 of mooring line 8 may be positioned therebetween. By means not shown in detail the device 11 is adapted to be anchored to the sea bed 10 (in an alternative embodiment it could be adapted to be mounted to the buoy 5). The gripper means 13 is adapted to be brought in a state disengaging the mooring line 8.
It should be noted that such hold and release de-vices 11 may need to be provided in each and every mooring line 8.
The assembly operates as follows. When one desires to disconnect the buoy 5 from the turret 2 under circum-stances with high mooring forces in the mooring lines, the mooring lines, starting before disconnecting the buoy from the turret, are manipulated such that at least during the moment of disconnecting the buoy 5 from the turret 2 the mooring forces are lowered or even substantially eliminated.
This is achieved by allowing the mooring lines to increase their effective length, which is defined as the maximum dis-tance between the buoy 5 and a respective mooring point 9 allowed by a mooring line 8. Such an increase occurs when the gripper means 1.3 closest. to the buoy disengages the mooring line 8 (for example under remote control from the vessel by an umbilical - not shown -).
The process of disconnecting any piping from the risers 6 within the turret 2 will then very likely already take place and will not be described here because it is con-sidered standard practise.
When the gripper means 13 has disengaged the moor-ing line 8 the buoy 5 will be disconnected from the turret 2 (for example by releasing locking mechanisms therebetween) and the buoy will drop from the turret. This disconnecting under- reduced mooring forces is possible as long as the ex-cess length 15 of mooring line 8 is being handed out by the hold and .r_el.ease device 11.
A corresponding operation is conceivable in an al-ternative embodiment in which the hold and release device 11 would be mounted to the buoy 5 and wherein the mooring line 8 for the increase of its effective length is released at the gripper means closest to the mooring point 9.
it is possible that the connection between the turret 2 and buoy 5, when connected, is water tight. Then one can, previous to said manipulation of the mooring lines and disconnection of tie buoy, pump water into the turret 2 above the buoy 5, preferably until a level above sea level.
~'he water pressure then assists in the release of the buoy from the turret.
Reconnecting the buoy 5 to the turret may be achieved in the following manner: the mooring lines 8 firstly are repositioned in the hold and release devices 11 between the gr:i.pper means 13 and 14 (with the excess length 15 restored). For example, a wildcat may be associated with gripper means 13 to pay back released mooring line between gripper means 13 and 14.
A hoisting wire connected to a turret mounted winch (not illustrated) will. be lowered and connected to the buoy hovering in the water. The buoy 5 is hoisted with its upper section 7 into a corresponding recess of the turret and is locked. Finally -1- he turret is pumped dry and the ris-ers are reconnected to corresponding piping within t`e tur-ret.
Figure 2 relates to an alternative embodiment in which the buoy 5 comprises a first buoy part 51 to which the .mooring lines 8 are connected and a second buoy part 5" to which the risers 6 are connected and which is provided with auxiliary mooring lines 3.6. The operation of this alterna-tive embodiment is such that, previous to manipulating the mooring lines 8 as explained above with respect to figure 1, the second buoy part 5" is released from and lowered rela-tive to the first buoy part 5'.
The invention is not limited to the embodiments described before which may be varied widely within the scope of the invention as defined by the appending claims. Thus the hold and release device, for example, might be con-structed in such a manner that the respective mooring line is severed. fully In case of an emergency situation, for ex-ample by devising gripper means 14 as a break element.
in a second aspect the invention relates to a hold and release device for use in a method for disconnecting a buoy from a turret in an arrangement with a vessel of the type comprising a turret mounted rotatably in the vessel and a buoy supporting risers which is lockable to and discon-r_ectable from the turret, the arrangement further comprising mooring lines connecting the buoy with mooring points on the seabed, said device comprising a housing with at least two distanced mooring line gripper means constructed such that an excess length of mooring line may be positioned therebe-tween and wherein at least one gripper means is adapted to be brought in a state disengaging the mooring line.
The gripper means may be constructed in many dif-ferent ways, for example as hydraulically operated grippers.
It should be kept in mind that the mooring forces are trans-mitted through these gripper means which therefore have to withstand large forces.
Depending on the specific embodiment the hold and release device may be adapted to be mounted to the buoy or may be adapted to be anchored to the sea bed.
Hereinafter the invention will be elucidated while referring to the drawing, in which:
Fig. 1. schematically shows a first embodiment of an assembly for carrying out a method according to the pre-sent invention, and Fig. 2 schematically shows a second embodiment of an assembly for carrying out a method according to the pre-sent invention.
Referring to figure 1 a vessel 1 is represented of the type comprising a turret 2 mounted rotatably (by bearings 3 and 4) in the vessel and a buoy 5 supporting ris-ers 6. In a manner known per se (e.g. by means of a tapering top section 'i) the buoy 5 is lockable to and disconnectable from the turret 2. There further are provided mooring lines 8 connecting the buoy 5 with mooring points 9 (anchors or piles) on the seabed 10 and loading the buoy with mooring forces.
A hold and release device 11 comprises a housing 12 with at least. two distanced mooring .line gripper means 13 and 14 (for example hydraulically operated grippers) con-structed such that an excess length 15 of mooring line 8 may be positioned therebetween. By means not shown in detail the device 11 is adapted to be anchored to the sea bed 10 (in an alternative embodiment it could be adapted to be mounted to the buoy 5). The gripper means 13 is adapted to be brought in a state disengaging the mooring line 8.
It should be noted that such hold and release de-vices 11 may need to be provided in each and every mooring line 8.
The assembly operates as follows. When one desires to disconnect the buoy 5 from the turret 2 under circum-stances with high mooring forces in the mooring lines, the mooring lines, starting before disconnecting the buoy from the turret, are manipulated such that at least during the moment of disconnecting the buoy 5 from the turret 2 the mooring forces are lowered or even substantially eliminated.
This is achieved by allowing the mooring lines to increase their effective length, which is defined as the maximum dis-tance between the buoy 5 and a respective mooring point 9 allowed by a mooring line 8. Such an increase occurs when the gripper means 1.3 closest. to the buoy disengages the mooring line 8 (for example under remote control from the vessel by an umbilical - not shown -).
The process of disconnecting any piping from the risers 6 within the turret 2 will then very likely already take place and will not be described here because it is con-sidered standard practise.
When the gripper means 13 has disengaged the moor-ing line 8 the buoy 5 will be disconnected from the turret 2 (for example by releasing locking mechanisms therebetween) and the buoy will drop from the turret. This disconnecting under- reduced mooring forces is possible as long as the ex-cess length 15 of mooring line 8 is being handed out by the hold and .r_el.ease device 11.
A corresponding operation is conceivable in an al-ternative embodiment in which the hold and release device 11 would be mounted to the buoy 5 and wherein the mooring line 8 for the increase of its effective length is released at the gripper means closest to the mooring point 9.
it is possible that the connection between the turret 2 and buoy 5, when connected, is water tight. Then one can, previous to said manipulation of the mooring lines and disconnection of tie buoy, pump water into the turret 2 above the buoy 5, preferably until a level above sea level.
~'he water pressure then assists in the release of the buoy from the turret.
Reconnecting the buoy 5 to the turret may be achieved in the following manner: the mooring lines 8 firstly are repositioned in the hold and release devices 11 between the gr:i.pper means 13 and 14 (with the excess length 15 restored). For example, a wildcat may be associated with gripper means 13 to pay back released mooring line between gripper means 13 and 14.
A hoisting wire connected to a turret mounted winch (not illustrated) will. be lowered and connected to the buoy hovering in the water. The buoy 5 is hoisted with its upper section 7 into a corresponding recess of the turret and is locked. Finally -1- he turret is pumped dry and the ris-ers are reconnected to corresponding piping within t`e tur-ret.
Figure 2 relates to an alternative embodiment in which the buoy 5 comprises a first buoy part 51 to which the .mooring lines 8 are connected and a second buoy part 5" to which the risers 6 are connected and which is provided with auxiliary mooring lines 3.6. The operation of this alterna-tive embodiment is such that, previous to manipulating the mooring lines 8 as explained above with respect to figure 1, the second buoy part 5" is released from and lowered rela-tive to the first buoy part 5'.
The invention is not limited to the embodiments described before which may be varied widely within the scope of the invention as defined by the appending claims. Thus the hold and release device, for example, might be con-structed in such a manner that the respective mooring line is severed. fully In case of an emergency situation, for ex-ample by devising gripper means 14 as a break element.
Claims (11)
1. Method for disconnecting a buoy from a turret in an arrangement with a vessel of the type comprising a turret mounted rotatably in the vessel and a buoy supporting risers which is lockable to and disconnectable from the tur-ret, the arrangement further comprising mooring lines con-necting the buoy with mooring points on the seabed and load-ing the buoy with mooring forces, characterised in that starting before disconnecting the buoy from the turret the mooring lines are manipulated such that at least during the moment of disconnecting the buoy from the turret the mooring forces are lowered or even substantially eliminated.
2. Method according to claim 1, wherein the ma-nipulation of the mooring lines comprises allowing the moor-ing lines to increase their effective length, which is de-fined as the maximum distance between the buoy and a respec-tive mooring point allowed by a mooring line.
3. Method according to claim 2, wherein each moor-ing line extends through a hold and release device and is held thereby at two distanced gripper means with an excess length of mooring line between said two distanced gripper means, and wherein the mooring line for the increase of its effective length is released at one gripper means for giving out the excess length of mooring line.
4. Method according to claim 3, wherein the hold and release device is anchored to the seabed and wherein the mooring line for the increase of its effective length is re-leased at the gripper means closest to the buoy.
5. Method according to claim 3, wherein the hold and release device is mounted to the buoy and wherein the mooring line for the increase of its effective length is re-leased at the gripper means closest to the mooring point.
6. Method according to any of the previous claims, wherein the buoy comprises a first buoy part to which the mooring lines are connected and a second buoy part to which the risers are connected and which is provided with auxil-lary mooring lines, wherein previous to manipulating the mooring lines the second buoy part is released from and low-ered relative to the first buoy part.
7. Method according to any of the previous claims, wherein the connection between the turret and buoy, when connected, is water tight and wherein previous to said ma-nipulation of the mooring lines water is pumped into the turret above the buoy.
8. Method according to claim 7, wherein the water is pumped until a level above sea level.
9. Hold and release device for use in a method for disconnecting a buoy from a turret in an arrangement with a vessel of the type comprising a turret mounted rotatably in the vessel and a buoy supporting risers which is lockable to and disconnectable from the turret, the arrangement further comprising mooring lines connecting the buoy with mooring points on the seabed, said device comprising a housing with at least two distanced mooring line gripper means con-structed such that an excess length of mooring line may be positioned therebetween and wherein at least one gripper means is adapted to be brought in a state disengaging the mooring line.
10. Hold and release device according to claim 9, wherein it is adapted to be mounted to the buoy.
11. Hold and release device according to claim 9, wherein it is adapted to be anchored to the sea bed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2009/063987 WO2011047736A1 (en) | 2009-10-23 | 2009-10-23 | Method for disconnecting a buoy from a vessel and device for use therewith |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2778285A1 true CA2778285A1 (en) | 2011-04-28 |
| CA2778285C CA2778285C (en) | 2016-12-20 |
Family
ID=42633136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2778285A Active CA2778285C (en) | 2009-10-23 | 2009-10-23 | Method for disconnecting a buoy from a vessel and device for use therewith |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2490931B1 (en) |
| CA (1) | CA2778285C (en) |
| DK (1) | DK2490931T3 (en) |
| RU (1) | RU2508222C2 (en) |
| WO (1) | WO2011047736A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE1250952A1 (en) * | 2012-08-24 | 2013-07-02 | Procedure for anchoring a vehicle and its apparatus | |
| US10421523B2 (en) | 2017-07-31 | 2019-09-24 | NOV APL Limited | Spread moored buoy and floating production system |
| RU197816U1 (en) * | 2020-02-04 | 2020-05-29 | Общество с ограниченной ответственностью "Марлин-Юг" | Device for automatic deployment of an autonomous drifting buoy with an extended vertically oriented measuring line |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3770083D1 (en) * | 1986-08-27 | 1991-06-20 | Taylor Woodrow Const Ltd | FASTENING ARRANGEMENT AND METHOD FOR FASTENING A FLOATING BODY. |
| BR9206833A (en) * | 1991-11-27 | 1995-11-07 | Norske Stats Oljeselskap | System for loading / unloading a fluent medium especially oil on a ship |
| NO176130C (en) * | 1992-05-25 | 1997-07-08 | Norske Stats Oljeselskap | System for use in offshore petroleum production |
| NO302159B1 (en) * | 1994-11-04 | 1998-02-02 | Norske Stats Oljeselskap | Device for loading / unloading buoy for use on shallow water |
| NO310604B1 (en) * | 1996-06-13 | 2001-07-30 | Petroleum Geo Services As | Submersible detachable bow |
| EP0831023A1 (en) * | 1996-09-20 | 1998-03-25 | Single Buoy Moorings Inc. | Independently disconnectable buoy |
| EP0831022A1 (en) * | 1996-09-20 | 1998-03-25 | Single Buoy Moorings Inc. | Quick disconnect chainstopper |
| US5816182A (en) * | 1996-10-30 | 1998-10-06 | Imodo, Inc. | Tension mooring system |
| US7766710B2 (en) * | 2005-10-17 | 2010-08-03 | Single Buoy Moorings Inc. | Disconnectable buoyant turrent mooring system |
| GB2449488C (en) | 2007-05-24 | 2016-06-22 | Bluewater Energy Services Bv | Disconnectable turret mooring system for a vessel |
-
2009
- 2009-10-23 DK DK09748290.5T patent/DK2490931T3/en active
- 2009-10-23 WO PCT/EP2009/063987 patent/WO2011047736A1/en active Application Filing
- 2009-10-23 CA CA2778285A patent/CA2778285C/en active Active
- 2009-10-23 RU RU2012118583/11A patent/RU2508222C2/en active
- 2009-10-23 EP EP09748290.5A patent/EP2490931B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2778285C (en) | 2016-12-20 |
| EP2490931A1 (en) | 2012-08-29 |
| RU2508222C2 (en) | 2014-02-27 |
| DK2490931T3 (en) | 2016-03-14 |
| WO2011047736A1 (en) | 2011-04-28 |
| EP2490931B1 (en) | 2015-12-23 |
| RU2012118583A (en) | 2013-11-27 |
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Effective date: 20141008 |