WO2002072415A1 - A method and a means for connecting two floating units - Google Patents
A method and a means for connecting two floating units Download PDFInfo
- Publication number
- WO2002072415A1 WO2002072415A1 PCT/NO2002/000099 NO0200099W WO02072415A1 WO 2002072415 A1 WO2002072415 A1 WO 2002072415A1 NO 0200099 W NO0200099 W NO 0200099W WO 02072415 A1 WO02072415 A1 WO 02072415A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- unit
- friction
- buoyancy
- position keeping
- cofferdam
- Prior art date
Links
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
Definitions
- the present invention is related to a method and a means for connection two units floating in the sea.
- connection of two floating units in the sea is done by use of ropes, wires, hawsers or by a mechanical system such as hinged rigid yokes or male/female type of connections.
- Other methods have been proposed without having been implemented, e.g. use of magnets.
- Connection of two floating units for transfer of mooring forces from one unit to the other is a typical operation, e.g. during offshore loading of crude oil from a loading terminal to a tanker.
- Figure 1 illustrates schematically a cross section through two floating units connected to each other according to the present invention
- figure 2 discloses a top view of the lower unit
- figure 3 discloses the two floating units in figure 1 equipped with a thrusters system
- figure 4 discloses correspondingly the two units equipped with a morring system.
- the attachment system or mooring force transfer system according to the present invention uses a combination of buoyancy for the lower unit that will force the unit upwardly towards the upper unit, and a "suction coup" using the hydrostatic pressure at the relevant water depth to create a pressure differential over the suction coup seals.
- the lower unit 2 is equipped with buoyancy tanks that when emptied will provide a net buoyancy force in the upwards direction towards the bottom of the upper unit 1 , such that the lower unit 2 will be attached to the upper unit 1.
- the lower unit 2 is equipped with seals 3 that will get in contact with the upper unit 1 when the lower unit 2 is forced towards the upper unit 1 by increased buoyancy, where the seals will create closed compartments or cofferdams 4 between the lower unit 2 and the upper unit 1.
- the lower unit 2 is equipped with friction pads 5 and 6, typically made of rubber with high friction coefficient, covering the majority of the area surrounded by the seals.
- the friction pads will make sure that the contact force is equally distributed over the contact area, and provide that horizontal loads can be transferred between the units by friction.
- the lower unit 2 will typically be equipped with means for position keeping, such as a mooring system 9 or a thrusters system 8 as disclosed in figures 3 and 4.
- the attachment system as described herein will be the means for transferring such position keeping forces to the upper unit 1 as this unit is being subject to environmental loads such as current, waves and wind.
- the water entrapped in the cofferdams can be pumped out through a water outlet line 10, at the same time as air is being let into the cofferdam through an air inlet line 11, to utilize the hydrostatic pressure at the actual draft.
- the difference in pressure inside the cofferdam and the hydrostatic pressure outside the cofferdam will force the lower unit 2 towards the upper unit 1 in addition to the buoyancy force provided by the emptied buoyancy tanks.
- the hydrostatic pressure will be 10 T/m .
- the lower unit 2 With a cofferdam footprint area of 100 m , the lower unit 2 will be forced towards the upper unit 1 by a load of 1 000 T. This load will have no effect on the upper unit 1, since it is the initial buoyancy that will be replaced by the distributed load from the friction pads.
- the number and size of the cofferdams can be varied to fit the relevant purpose and application.
- Figure 2 shows shock absorbing fenders 7 that will provide a smooth connection as the two units are brought together.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02705632A EP1377497A1 (en) | 2001-03-09 | 2002-03-11 | A method and a means for connecting two floating units |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20011232A NO20011232D0 (en) | 2001-03-09 | 2001-03-09 | Method and device for connecting two floating units |
NO20011232 | 2001-03-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002072415A1 true WO2002072415A1 (en) | 2002-09-19 |
Family
ID=19912241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO2002/000099 WO2002072415A1 (en) | 2001-03-09 | 2002-03-11 | A method and a means for connecting two floating units |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1377497A1 (en) |
NO (1) | NO20011232D0 (en) |
WO (1) | WO2002072415A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003078243A1 (en) * | 2002-03-19 | 2003-09-25 | Hitec Vision As | A device and a method of a mooring buoy |
FR2857347A1 (en) * | 2003-07-10 | 2005-01-14 | Doris Engineering | FLOATING TERMINAL FOR LOADING / UNLOADING SHIPS SUCH AS METHANIERS |
WO2005118389A1 (en) | 2004-06-03 | 2005-12-15 | Remora Technology As | A method of dynamic positioning of a vessel |
CN115430845A (en) * | 2022-08-01 | 2022-12-06 | 汕头大学 | Leveling device of 3D printer |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000075008A1 (en) * | 1999-06-09 | 2000-12-14 | Hitec Marine As | System for loading and unloading fluid products |
-
2001
- 2001-03-09 NO NO20011232A patent/NO20011232D0/en unknown
-
2002
- 2002-03-11 WO PCT/NO2002/000099 patent/WO2002072415A1/en not_active Application Discontinuation
- 2002-03-11 EP EP02705632A patent/EP1377497A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000075008A1 (en) * | 1999-06-09 | 2000-12-14 | Hitec Marine As | System for loading and unloading fluid products |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003078243A1 (en) * | 2002-03-19 | 2003-09-25 | Hitec Vision As | A device and a method of a mooring buoy |
FR2857347A1 (en) * | 2003-07-10 | 2005-01-14 | Doris Engineering | FLOATING TERMINAL FOR LOADING / UNLOADING SHIPS SUCH AS METHANIERS |
WO2005118389A1 (en) | 2004-06-03 | 2005-12-15 | Remora Technology As | A method of dynamic positioning of a vessel |
US8028638B2 (en) | 2004-06-03 | 2011-10-04 | Remora Technology As | Method of dynamic positioning of a vessel |
CN115430845A (en) * | 2022-08-01 | 2022-12-06 | 汕头大学 | Leveling device of 3D printer |
CN115430845B (en) * | 2022-08-01 | 2023-06-06 | 汕头大学 | Leveling device of 3D printer |
Also Published As
Publication number | Publication date |
---|---|
EP1377497A1 (en) | 2004-01-07 |
NO20011232D0 (en) | 2001-03-09 |
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