EP1433699A1 - Turret mooring apparatus for power plant - Google Patents
Turret mooring apparatus for power plant Download PDFInfo
- Publication number
- EP1433699A1 EP1433699A1 EP03257846A EP03257846A EP1433699A1 EP 1433699 A1 EP1433699 A1 EP 1433699A1 EP 03257846 A EP03257846 A EP 03257846A EP 03257846 A EP03257846 A EP 03257846A EP 1433699 A1 EP1433699 A1 EP 1433699A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vessel
- turret
- riser pipe
- mooring apparatus
- cable
- 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.)
- Withdrawn
Links
Images
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
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/4433—Floating structures carrying electric power plants
Definitions
- the present invention relates to a turret mooring system for a floating vessel which produces power from on-board power plant.
- barges located off-shore and to transfer the power to shore and into the electricity network.
- barges are spread-moored in a manner which does not allow the barge to weathervane around the mooring in response to the action of wind, wave and current.
- barges may be turret-moored wherein mooring lines are attached to a turret rotatably mounted to the barge. This system allows the vessel to weathervane around the turret and the mooring lines in response to wind, wave and current action.
- the present invention provides a vessel mooring apparatus comprising a turret structure rotatably mountable to a vessel, at least one mooring line securable to the turret, a riser pipe extending through the turret and securable to the vessel for rotation therewith relative to the turret, and an electrical cable connectable to the vessel and extending into the riser pipe, wherein the cable is operable to accommodate torsion created in use by rotation of the vessel and riser pipe relative to the turret.
- the invention avoids the need for an electrical swivel by allowing limited weathervaning of the vessel around a turret mooring system and using the torsion-absorbing capability of the subsea electrical cable to take up the torsion created by weathervaning of the vessel.
- the electrical cable may be suspended from hang-off means at the top of the riser pipe, or at the bottom of the riser pipe.
- the hang-off means may comprise a clamping device. This takes the vertical load of the cable.
- the top of the riser pipe is supported on the turret by a roller bearing, whereby the riser pipe is rotatable relative to the turret. This transfers the vertical load of the cable from the riser pipe to the turret.
- the top of the riser pipe may be rigidly supported by a support frame mountable directly on the vessel.
- the bottom of the riser pipe may be supported by a sliding bearing, to take the horizontal load of the cable.
- the apparatus further comprises means to prevent or reduce bending of the electrical cable at the lower end of the riser pipe.
- the invention also provides a vessel incorporating a mooring apparatus of the type described above.
- means is provided which is operable to restore the original heading of the vessel when a maximum permissible rotation relative to the turret has been reached.
- the apparatus may be designed such that the weathervaning up to about 360o of rotation is permissible, after which point the vessel would be rotated back to its original heading either using thrust producing devices mounted on the vessel itself, or by some external means such as tugs.
- a floating vessel 10 only part of which is shown, has a vertically extending aperture 12 through its hull in which a rotatable turret 14 is located, supported by upper and lower bearings 16, 18.
- a plurality of mooring lines, such as anchor chains 20, only one of which is shown for convenience, are attached to the turret 14 in a known manner, for example via a chain stopper 22 to a chain hawse pipe 24. In this way, the vessel 10 is able to rotate around the turret 14 and the anchor chains 20 in response to wave, wind and current action.
- a riser pipe 26 passes up through the turret 14 and is connected to the vessel 10 such that it rotates with the vessel 10 relative to the turret 14 and anchor chains 20.
- a subsea electrical cable 28 passes up inside the riser pipe 26 and is suspended from a hang-off 30, such as a clamping device at the top of the riser pipe 26. Alternatively, it may be suspended from a hang-off located at the bottom of the riser pipe 26. In this case, the cable 28 still extends up above the hang-off up through the riser pipe 26 for connection to the power plant, while the hang-off takes the vertical load of the cable 28.
- the riser pipe 26 may be supported at the top by a roller bearing 32 to take the vertical load of cable 28.
- the bottom of the riser pipe 26 may be supported by a sliding bearing 34 to take the horizontal load of the cable 28.
- Figures 2A-2D show in more detail alternative embodiments of an arrangement for supporting the turret 14, riser pipe 26 and cable 28.
- the top of the cable 28 is attached to a clamping device 30 which is itself attached to the vessel 10.
- the clamping device 30, cable 28 and riser pipe 26 are rotatably supported on the turret 14 by a bearing 32 and the turret rotatably supported on the vessel 10 by a bearing 16.
- riser 26 and cable 28 and clamping device 30 are mounted so as to be rotatable with the vessel 10 and relative to the turret 14.
- Means to prevent excessive bending of the electrical cable 28 is preferably provided at the underside of the riser pipe 26.
- This may be in the form of a known device such as a bend stiffener or bend restricter 36 as shown in Figure 3.
- the bend stiffener 36 itself may be supported from a hang-off 38 at the bottom of the riser pipe 26.
- the cable 28 is able to slide freely relative to the bend stiffener 36.
- the riser pipe 26 rotates with the vessel 10.
- the cable 28 accommodates the torsion this creates.
- the cable 28 is able to accommodate in the order of a few degrees per metre and thus the allowability angle to which the vessel 10 can rotate around the turret 14 depends upon the length of the subsea cable 28.
- Means are provided to return the vessel to its original heading when the maximum permissible amount of rotation has been achieved. This may involve thrust means of the vessel 10 itself, or thrust may be provided externally, for example by means of tugs (not shown).
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Electric Cable Arrangement Between Relatively Moving Parts (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
Description
- The present invention relates to a turret mooring system for a floating vessel which produces power from on-board power plant.
- It is known to generate power on-board floating barges located off-shore and to transfer the power to shore and into the electricity network. Normally, such barges are spread-moored in a manner which does not allow the barge to weathervane around the mooring in response to the action of wind, wave and current. Alternatively, such barges may be turret-moored wherein mooring lines are attached to a turret rotatably mounted to the barge. This system allows the vessel to weathervane around the turret and the mooring lines in response to wind, wave and current action.
- If a barge is turret-moored in this way, an electrical swivel apparatus is required on top of the turret in order to transfer the power from the weathervaning barge to stationary subsea cabling. Usually, a large amount of power is being produced in these situations, in the order of 100 to 500MW, and thus a large electrical swivel is required.
- The present invention provides a vessel mooring apparatus comprising a turret structure rotatably mountable to a vessel, at least one mooring line securable to the turret, a riser pipe extending through the turret and securable to the vessel for rotation therewith relative to the turret, and an electrical cable connectable to the vessel and extending into the riser pipe, wherein the cable is operable to accommodate torsion created in use by rotation of the vessel and riser pipe relative to the turret.
- In this way, the invention avoids the need for an electrical swivel by allowing limited weathervaning of the vessel around a turret mooring system and using the torsion-absorbing capability of the subsea electrical cable to take up the torsion created by weathervaning of the vessel.
- The electrical cable may be suspended from hang-off means at the top of the riser pipe, or at the bottom of the riser pipe. The hang-off means may comprise a clamping device. This takes the vertical load of the cable.
- In one embodiment, the top of the riser pipe is supported on the turret by a roller bearing, whereby the riser pipe is rotatable relative to the turret. This transfers the vertical load of the cable from the riser pipe to the turret.
- Alternatively, the top of the riser pipe may be rigidly supported by a support frame mountable directly on the vessel.
- The bottom of the riser pipe may be supported by a sliding bearing, to take the horizontal load of the cable.
- Preferably the apparatus further comprises means to prevent or reduce bending of the electrical cable at the lower end of the riser pipe.
- The invention also provides a vessel incorporating a mooring apparatus of the type described above. In this case, advantageously, means is provided which is operable to restore the original heading of the vessel when a maximum permissible rotation relative to the turret has been reached.
- For example, the apparatus may be designed such that the weathervaning up to about 360o of rotation is permissible, after which point the vessel would be rotated back to its original heading either using thrust producing devices mounted on the vessel itself, or by some external means such as tugs.
- The present invention will now be described in detail, with reference to the accompanying drawings in which:
- Figure 1 shows a cross-section of a turret-mooring apparatus in accordance with one embodiment of the present invention;
- Figures 2A-2D show alternative arrangements for supporting the riser pipe and electrical cable; and
- Figure 3 shows an arrangement for supporting the bottom of the riser pipe.
-
- A
floating vessel 10, only part of which is shown, has a vertically extendingaperture 12 through its hull in which arotatable turret 14 is located, supported by upper andlower bearings anchor chains 20, only one of which is shown for convenience, are attached to theturret 14 in a known manner, for example via achain stopper 22 to achain hawse pipe 24. In this way, thevessel 10 is able to rotate around theturret 14 and theanchor chains 20 in response to wave, wind and current action. - A
riser pipe 26 passes up through theturret 14 and is connected to thevessel 10 such that it rotates with thevessel 10 relative to theturret 14 andanchor chains 20. - A subsea
electrical cable 28 passes up inside theriser pipe 26 and is suspended from a hang-off 30, such as a clamping device at the top of theriser pipe 26. Alternatively, it may be suspended from a hang-off located at the bottom of theriser pipe 26. In this case, thecable 28 still extends up above the hang-off up through theriser pipe 26 for connection to the power plant, while the hang-off takes the vertical load of thecable 28. - The
riser pipe 26 may be supported at the top by a roller bearing 32 to take the vertical load ofcable 28. The bottom of theriser pipe 26 may be supported by a sliding bearing 34 to take the horizontal load of thecable 28. - Figures 2A-2D show in more detail alternative embodiments of an arrangement for supporting the
turret 14,riser pipe 26 andcable 28. - In Figure 2A, the top of the
cable 28 is attached to aclamping device 30 which is itself attached to thevessel 10. Theclamping device 30,cable 28 andriser pipe 26 are rotatably supported on theturret 14 by abearing 32 and the turret rotatably supported on thevessel 10 by abearing 16. - In Figure 2B the
riser 26 andcable 28 andclamping device 30 are mounted on asupport frame 42 secured to the part of the upper turret bearing 16 that is itself mounted on thevessel 10. - In Figure 2C the
riser 26 andcable 28 andclamping device 30 are mounted on asupport frame 44 secured directly to the deck of thevessel 10. - In Figure 2D the
riser 26 andcable 28 andclamping device 30 are mounted on a cantileveredarm 46 secured to the deck of thevessel 10. - Thus, in each case the
riser 26 andcable 28 andclamping device 30 are mounted so as to be rotatable with thevessel 10 and relative to theturret 14. - Means to prevent excessive bending of the
electrical cable 28 is preferably provided at the underside of theriser pipe 26. This may be in the form of a known device such as a bend stiffener or bend restricter 36 as shown in Figure 3. Thebend stiffener 36 itself may be supported from a hang-off 38 at the bottom of theriser pipe 26. Thecable 28 is able to slide freely relative to thebend stiffener 36. - With all the arrangements described above, when the
vessel 10 rotates around theturret 14 in response to wind, wave and current, theriser pipe 26 rotates with thevessel 10. Thecable 28 accommodates the torsion this creates. Usually, thecable 28 is able to accommodate in the order of a few degrees per metre and thus the allowability angle to which thevessel 10 can rotate around theturret 14 depends upon the length of thesubsea cable 28. Means are provided to return the vessel to its original heading when the maximum permissible amount of rotation has been achieved. This may involve thrust means of thevessel 10 itself, or thrust may be provided externally, for example by means of tugs (not shown). - In this way, the need for an electrical swivel is avoided, reducing cost and simplifying installation and maintenance procedures. It will be appreciated that variations and modifications to the precise details described can be made without departing from the scope of the invention as defined in the claims.
Claims (10)
- A vessel mooring apparatus comprising a turret structure rotatably mountable to a vessel, at least one mooring line securable to the turret, a riser pipe extending through the turret and securable to the vessel for rotation therewith relative to the turret, and an electrical cable connectable to the vessel and extending into the riser pipe, wherein the cable is operable to accommodate torsion created in use by rotation of the vessel and riser pipe relative to the turret.
- A vessel mooring apparatus as claimed in claim 1, wherein the electrical cable is suspended from hang-off means at the top of the riser pipe.
- A vessel mooring apparatus as claimed in claim 1, wherein the electrical cable is suspended from hang-off means at the bottom of the riser pipe.
- A vessel mooring apparatus as claimed in claim 2 or claim 3, wherein the hang-off means comprises a clamping device.
- A vessel mooring apparatus as claimed in any preceding claim, wherein the top of the riser pipe is supported on the turret by a roller bearing, whereby the riser pipe is rotatable relative to the turret.
- A vessel mooring apparatus as claimed in any of claims 1-4, wherein the top of the riser pipe is rigidly supported by a support frame mountable directly on the vessel.
- A vessel mooring apparatus as claimed in any preceding claim, wherein the bottom of the riser pipe is supported by a sliding bearing.
- A vessel mooring apparatus as claimed in any preceding claim, further comprising means to prevent or reduce bending of the electrical cable at the lower end of the riser pipe.
- A vessel incorporating a mooring apparatus as claimed in any preceding claim.
- A vessel as claimed in claim 9, further comprising means operable to restore the original heading of the vessel when a maximum permissible rotation relative to the turret has been reached.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0230142A GB2396593B (en) | 2002-12-24 | 2002-12-24 | Turret mooring apparatus for power plant |
GB0230142 | 2002-12-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1433699A1 true EP1433699A1 (en) | 2004-06-30 |
Family
ID=9950418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03257846A Withdrawn EP1433699A1 (en) | 2002-12-24 | 2003-12-12 | Turret mooring apparatus for power plant |
Country Status (3)
Country | Link |
---|---|
US (1) | US20050005832A1 (en) |
EP (1) | EP1433699A1 (en) |
GB (1) | GB2396593B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009156751A2 (en) * | 2008-06-25 | 2009-12-30 | Sigma Offshore Limited | Offshore vessel mooring and riser inboarding |
NO336328B1 (en) * | 2013-11-01 | 2015-08-03 | Scana Offshore Vestby As | turret |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101044262B1 (en) * | 2009-08-18 | 2011-07-01 | 유융상 | Tensioner using leaf spring |
DK2948365T3 (en) | 2013-01-25 | 2018-03-26 | Tmt Pte Ltd | OFFSHORE INSTALLATIONS |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4406333A (en) * | 1981-10-13 | 1983-09-27 | Adams Johnie R | Rotating head for rotary drilling rigs |
US4420276A (en) * | 1980-04-24 | 1983-12-13 | The British Petroleum Company Limited | Bearing assembly for a tethered buoyant platform |
US4774903A (en) * | 1986-02-12 | 1988-10-04 | The Marconi Company Limited | Mooring tether |
WO1998036153A1 (en) * | 1997-02-13 | 1998-08-20 | Hitec Asa | Support of a number of parallel pipelines/hoses/cables etc. between a surface vessel and a point on the seabed |
US5913279A (en) * | 1995-03-08 | 1999-06-22 | Single Buoy Moorings Inc. | Bearing arrangement for limiting deflection of a turret of a turret mooring device |
WO2002052150A1 (en) * | 2000-12-22 | 2002-07-04 | Beheersmaatschappij P. Buitendijk B.V. | Mast construction and erection method for offshore installation |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4639228A (en) * | 1984-12-24 | 1987-01-27 | Mobil Oil Corporation | Rotating multi-path fluid manifold |
US4597595A (en) * | 1985-02-26 | 1986-07-01 | Bechtel International Corporation | Swivel-less coupling apparatus |
US5893334A (en) * | 1993-12-03 | 1999-04-13 | Fmc Corporation | Method and apparatus for mooring floating storage vessels |
US6688930B2 (en) * | 2001-05-22 | 2004-02-10 | Fmc Technologies, Inc. | Hybrid buoyant riser/tension mooring system |
-
2002
- 2002-12-24 GB GB0230142A patent/GB2396593B/en not_active Expired - Fee Related
-
2003
- 2003-12-12 EP EP03257846A patent/EP1433699A1/en not_active Withdrawn
- 2003-12-17 US US10/738,769 patent/US20050005832A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4420276A (en) * | 1980-04-24 | 1983-12-13 | The British Petroleum Company Limited | Bearing assembly for a tethered buoyant platform |
US4406333A (en) * | 1981-10-13 | 1983-09-27 | Adams Johnie R | Rotating head for rotary drilling rigs |
US4774903A (en) * | 1986-02-12 | 1988-10-04 | The Marconi Company Limited | Mooring tether |
US5913279A (en) * | 1995-03-08 | 1999-06-22 | Single Buoy Moorings Inc. | Bearing arrangement for limiting deflection of a turret of a turret mooring device |
WO1998036153A1 (en) * | 1997-02-13 | 1998-08-20 | Hitec Asa | Support of a number of parallel pipelines/hoses/cables etc. between a surface vessel and a point on the seabed |
WO2002052150A1 (en) * | 2000-12-22 | 2002-07-04 | Beheersmaatschappij P. Buitendijk B.V. | Mast construction and erection method for offshore installation |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009156751A2 (en) * | 2008-06-25 | 2009-12-30 | Sigma Offshore Limited | Offshore vessel mooring and riser inboarding |
WO2009156751A3 (en) * | 2008-06-25 | 2010-10-28 | Sigma Offshore Limited | Offshore vessel mooring and riser inboarding |
NO336328B1 (en) * | 2013-11-01 | 2015-08-03 | Scana Offshore Vestby As | turret |
US10160522B2 (en) | 2013-11-01 | 2018-12-25 | Scana Offshore As | Turret |
Also Published As
Publication number | Publication date |
---|---|
GB2396593B (en) | 2004-11-10 |
GB0230142D0 (en) | 2003-01-29 |
GB2396593A (en) | 2004-06-30 |
US20050005832A1 (en) | 2005-01-13 |
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Legal Events
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18D | Application deemed to be withdrawn |
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