EP0134313B1 - Système d'amarrage - Google Patents

Système d'amarrage Download PDF

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Publication number
EP0134313B1
EP0134313B1 EP19830201114 EP83201114A EP0134313B1 EP 0134313 B1 EP0134313 B1 EP 0134313B1 EP 19830201114 EP19830201114 EP 19830201114 EP 83201114 A EP83201114 A EP 83201114A EP 0134313 B1 EP0134313 B1 EP 0134313B1
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.)
Expired
Application number
EP19830201114
Other languages
German (de)
English (en)
Other versions
EP0134313A1 (fr
Inventor
Willem Jan Van Heijst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bluewater Terminal Systems NV
Original Assignee
Bluewater Terminal Systems NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bluewater Terminal Systems NV filed Critical Bluewater Terminal Systems NV
Priority to EP19830201114 priority Critical patent/EP0134313B1/fr
Publication of EP0134313A1 publication Critical patent/EP0134313A1/fr
Application granted granted Critical
Publication of EP0134313B1 publication Critical patent/EP0134313B1/fr
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to a mooring system comprising a turret having a rotatable part and a stationary part anchored to the seabed, and to which is connected an end of a flexible flowline which flowline is also connected to an underwater buoyant body substantially freely movable relative to the turret and anchored to the seabed.
  • Such a mooring system is known in itself from US-A-4301840.
  • the vessel which can be a tanker used for the storage of crude oil and even provided with production facilities on its deck, or a large barge, depending on the occurrence of waves, currents and winds
  • 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 up to 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 steeplyfrom the stationary part, for instance under an angle of 25° 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 resultthat 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 said end of the flowline between the buoyant body and the stationary end is 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 a moored 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.
  • US-A-4019213 describes the combination of a mooring tower and an underwater buoyant body; in the one disclosed embodiment (fig. 2) the buoyant body is carried at the end of a pivoting outrigger connected to the tower while in the second disclosed embodiment (fig. 1) the buoyant body is substantially freely movable with respect to the mooring turret and serves to keep the flowline taut. This latter arrangement has all the disadvantages of the known mooring system.
  • the vessel 1 is fitted to the rotatable part 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 up to 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 angle chains 6 which are supported by the stationary part 5 via chain stoppers 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.

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  • 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)

Claims (4)

1. Système d'amarrage comprenant une tourelle (4) ayant une partie tournante (2) et une partie fixe (5) ancrée au fond de la mer (12) à laquelle est relié un bout d'une conduite flexible (7), laquelle est également reliée à un corps flottant sous-marin (10) pratiquement libre de se déplacer par rapport à la tourelle et ancré an fond de la mer, caractérisé en ce que la partie fixe (5) porte un balancier (8) auquel ledit bout de la conduite (7), entre le corps flottant (10) et la partie fixe (5), est relié.
2. Système d'amarrage selon la revendication 1, caractérisé en ce que la partie fixe (5) porte plus d'un balancier (8).
3. Système d'amarrage selon la revendication 1 ou 2, caractérisé en ce que le corps flottant (10) est placé à courte distance sous la quille du navire amarré.
4. Système d'amarrage selon l'une des revendications 1 à 3, caractérisé en ce que chaque balancier (8) est individuellement relié par une ou plusieurs chaînes (11) au corps flottant (10).
EP19830201114 1983-07-28 1983-07-28 Système d'amarrage Expired EP0134313B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19830201114 EP0134313B1 (fr) 1983-07-28 1983-07-28 Système d'amarrage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830201114 EP0134313B1 (fr) 1983-07-28 1983-07-28 Système d'amarrage

Publications (2)

Publication Number Publication Date
EP0134313A1 EP0134313A1 (fr) 1985-03-20
EP0134313B1 true EP0134313B1 (fr) 1987-10-14

Family

ID=8190980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830201114 Expired EP0134313B1 (fr) 1983-07-28 1983-07-28 Système d'amarrage

Country Status (1)

Country Link
EP (1) EP0134313B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109415107A (zh) * 2016-07-05 2019-03-01 希弗朗特技术股份有限公司 可断开的船首转塔

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2768993B1 (fr) * 1997-09-26 1999-12-03 Doris Engineering Dispositif de liaison d'une bouee de dechargement et d'une installation marine de production de produits petroliers
WO2002060750A1 (fr) * 2001-01-24 2002-08-08 Single Buoy Moorings Inc. Systeme de dechargement absorbant le mouvement des vagues
FR3134793A1 (fr) * 2022-04-22 2023-10-27 Perenco Dispositif d’amarrage à tourelle externe et navire comportant un tel dispositif d’amarrage à tourelle externe.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109415107A (zh) * 2016-07-05 2019-03-01 希弗朗特技术股份有限公司 可断开的船首转塔
CN109415107B (zh) * 2016-07-05 2021-05-25 希弗朗特技术股份有限公司 可断开的船首转塔

Also Published As

Publication number Publication date
EP0134313A1 (fr) 1985-03-20

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