EP0134313A1 - Vertäuungssystem - Google Patents
Vertäuungssystem Download PDFInfo
- Publication number
- EP0134313A1 EP0134313A1 EP83201114A EP83201114A EP0134313A1 EP 0134313 A1 EP0134313 A1 EP 0134313A1 EP 83201114 A EP83201114 A EP 83201114A EP 83201114 A EP83201114 A EP 83201114A EP 0134313 A1 EP0134313 A1 EP 0134313A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flowline
- buoyant body
- outrigger
- stationary part
- mooring system
- 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.)
- Granted
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
Definitions
- the invention relates to a mooring system comprising a turret of which the stationary part is anchored to the seabed, and to which is to be connected the end of a flexible flowline which is subsequently connected to an underwater buoyant body anchored to the seabed.
- Such a mooring system is known in itself from for instance, U.S: Patent Specification 3,335,690; U.K. Patent 1,115,155; and from the advertisement of Imodco Inc. in, for example, "Ocean Industry", June 1982, Page 73.
- the use of a buoyant body and the requirements thereof are described in the 1982 Offshore Technology Conference Paper No. OTC.4321.
- the vessel can rotate through an angle of 360 with regard to the stationary second part of the mooring system.
- a swivel coupling at the upper part of this stationary part allows for the transfer of fluids from the flexible flowline upto the vessel deck.
- the flexible flowline must be kept within the periphery of the anchor chains or anchor cables with which the second part of the mooring is anchored to the seabed. In deep water these anchor chains or cables hang relatively steeply from the stationary part, for instance under an angle of 25 0 with the vertical. To prevent chafing and subsequent damage of the flowline it must be assured that the flowline stays within the space delimited by the anchor chains, with the result that the buoyant body must be a considerable distance below the surface of the water. As, however, the section of the flexible pipe between the stationary member and the buoyant body is dynamically loaded, due-to vessel movement, this part needs regular checking and maintenance which, in view of the deep level at which the buoyant body is positioned, is a difficult and expensive task.
- the invention aims to provide an alternative arrangement of the submerged flowline layout which obviates the disadvantages of the known layout.
- the stationary part carries an outrigger to which the flowline is to be connected. This simple measure makes it possible to locate the dynamic portion of the flowline outside the periphery of the anchor chains, eliminating any possibility of chafing or physical contact between the anchor chains and the flexible pipe, and greatly facilitating maintenance of this dynamically loaded flowline part.
- the latter preferably carries more than one outrigger.
- the buoyant body is preferably positioned at a short distance under the keel of the vessel, which of course greatly facilitates its maintenance. As the part of the flowline between the buoyant body and the floor shows very little dynamic motion, maintenance or repair of this part is practically nil.
- each outrigger can be individually connected by one or more chains to the buoyant body.
- the vessel 1 is fitted to the rotatable part 2 of the turret mooring 4 which in the shown embodiment is integrated with the bow 3 of the vessel 1.
- the stationary part 5 is interconnected with the rotatable part 2 in a basically vertical direction so that the vessel 1 can swing around the centre axis of the stationary part 5 to take the position of least resistance due to weather.
- the flexible flowline 7 is connected to the stationary part 5 via an outrigger 8.
- the length of the outrigger 8 is such that the flexible flowline remains clear of touching the anchor chains 6 in all circumstances.
- the flexible flowline 7 is connected to the buoyant body 10 and the configuration of the flexible flowline 7 is a catenary shape.
- the buoyant body 10 is anchored to an anchor on the seafloor 12 via a taut mooring line 14.
- the vertical position of the buoyancy tank 10 is just below the keel of the vessel 1 so that it can freely rotate over this buoyant body 10.
- the flexible flowline 7 continues from the buoyant body 10 down to the seafloor 12 via a free-hanging section 16.
- the flowline 7 continues with a rigid pipe 18 to the stationary part 5 upto deck level of the vessel 1.
- a swivel joint 20 is incorporated in the rigid pipe 18.
- Fig. 3 the top view shows again the vessel 1, the anchor chains 6, the stationary part 5, the rotatable part 2 and the outrigger 8.
- the outrigger 8 could be extended into a triangular frame 9 so that between the outrigger 8 and the buoyant body 10 a certain offset can be obtained so that the flowline 7 can be maintained and lifted over the side of the vessel 1 in the particular heading of that vessel 1.
- one or more tension chains 11 are fitted between the triangular part of the outrigger 9 and the buoyant body 10.
- Fig. 4 in more detail shows a typical configuration of the outrigger 8, the triangular frame 9, the flexible flowlines 7, the rigid pipe 18 and the anchor chains 6 which are supported by the stationary part 5 via chainstoppers 15. Also shown are the tension chains 11, the number and weight of which are dependent on the size, weight and number of flowlines 7.
- An alternative design for more flowlines could comprise two or more outriggers to the stationary part, positioned such that an equilibrium is obtained.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Revetment (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19830201114 EP0134313B1 (de) | 1983-07-28 | 1983-07-28 | Vertäuungssystem |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19830201114 EP0134313B1 (de) | 1983-07-28 | 1983-07-28 | Vertäuungssystem |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0134313A1 true EP0134313A1 (de) | 1985-03-20 |
EP0134313B1 EP0134313B1 (de) | 1987-10-14 |
Family
ID=8190980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19830201114 Expired EP0134313B1 (de) | 1983-07-28 | 1983-07-28 | Vertäuungssystem |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0134313B1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2768993A1 (fr) * | 1997-09-26 | 1999-04-02 | Doris Engineering | Dispositif de liaison d'une bouee de dechargement et d'une installation marine de production de produits petroliers |
WO2002060750A1 (en) * | 2001-01-24 | 2002-08-08 | Single Buoy Moorings Inc. | Wave motion absorbing offloading system |
US10974793B2 (en) | 2016-07-05 | 2021-04-13 | Seasystems As | Disconnectable bow turret |
GB2619409A (en) * | 2022-04-22 | 2023-12-06 | Perenco | External turret mooring device and ship comprising such an external turret mooring device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4019213A (en) * | 1972-11-09 | 1977-04-26 | Coflexip | Piping apparatus for a floating or semi-submersible platform |
US4301840A (en) * | 1979-06-18 | 1981-11-24 | Amtel, Inc. | Fixed turret subsea hydrocarbon production terminal |
-
1983
- 1983-07-28 EP EP19830201114 patent/EP0134313B1/de not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4019213A (en) * | 1972-11-09 | 1977-04-26 | Coflexip | Piping apparatus for a floating or semi-submersible platform |
US4301840A (en) * | 1979-06-18 | 1981-11-24 | Amtel, Inc. | Fixed turret subsea hydrocarbon production terminal |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2768993A1 (fr) * | 1997-09-26 | 1999-04-02 | Doris Engineering | Dispositif de liaison d'une bouee de dechargement et d'une installation marine de production de produits petroliers |
WO2002060750A1 (en) * | 2001-01-24 | 2002-08-08 | Single Buoy Moorings Inc. | Wave motion absorbing offloading system |
US6916218B2 (en) | 2001-01-24 | 2005-07-12 | Single Buoy Moorings Inc. | Wave motion absorbing offloading system |
US10974793B2 (en) | 2016-07-05 | 2021-04-13 | Seasystems As | Disconnectable bow turret |
GB2619409A (en) * | 2022-04-22 | 2023-12-06 | Perenco | External turret mooring device and ship comprising such an external turret mooring device |
Also Published As
Publication number | Publication date |
---|---|
EP0134313B1 (de) | 1987-10-14 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19840621 |
|
AK | Designated contracting states |
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RBV | Designated contracting states (corrected) |
Designated state(s): FR GB IT NL |
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ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO MILANO S.P.A. |
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