EP2070812A1 - Ensemble d'amarrage - Google Patents

Ensemble d'amarrage Download PDF

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Publication number
EP2070812A1
EP2070812A1 EP07122733A EP07122733A EP2070812A1 EP 2070812 A1 EP2070812 A1 EP 2070812A1 EP 07122733 A EP07122733 A EP 07122733A EP 07122733 A EP07122733 A EP 07122733A EP 2070812 A1 EP2070812 A1 EP 2070812A1
Authority
EP
European Patent Office
Prior art keywords
floating
assembly according
piston
mooring
surge motion
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Withdrawn
Application number
EP07122733A
Other languages
German (de)
English (en)
Inventor
Marinus Uittenbogaard
Jaap-Jan Van Nielen
Jelte Kymmell
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 Energy Services BV
Original Assignee
Bluewater Energy Services BV
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 Energy Services BV filed Critical Bluewater Energy Services BV
Priority to EP07122733A priority Critical patent/EP2070812A1/fr
Publication of EP2070812A1 publication Critical patent/EP2070812A1/fr
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a mooring assembly for mooring a floating structure, such as a vessel, to a further floating or fixed structure, comprising a connecting structure acting with the vessel as a mass spring system with respect to at least the surge motion between the floating structure and the further floating or fixed structure.
  • the connecting structure enables the floating structure to maintain a position with respect to the further floating or fixed structure which may vary within predetermined margins (defining a 'position window').
  • the floating structure may be a vessel, whereas the further floating or fixed structure may be a buoy, a further vessel or a fixed tower anchored to the seabed.
  • the mass spring system character of the connecting system provides a reciprocating surge motion (motion along the longitudinal axis of the floating structure). Such a reciprocating surge motion can become undesirably large when the mass spring system (connecting structure with vessel) is excited in or close to a natural frequency (generally as a result of environmental loads, such as current, waves and wind).
  • the mooring assembly is characterized by a damping system for damping at least said surge motion.
  • the damping system provides damping forces for damping the reciprocating surge motion of the floating structure relative to the further floating or fixed structure, such that said surge motion is kept within acceptable limits.
  • the damping system in a very simple, yet nevertheless reliable manner provides an additional functionality to the mass spring system which, on itself, does not provide adequate damping.
  • the damping system only dampens the surge motion of the floating structure away from the further floating or fixed structure. This means that only when the reciprocating surge motion is in a phase in which the floating structure (such as a vessel) moves away from the further floating or fixed structure (such as a fixed tower) damping forces are generated to dampen the surge motion.
  • the complexity of the damping system can be kept at a minimum.
  • the damping system is devised for transforming kinetic energy of the surge motion into heat.
  • the damping system is devised for transforming the surge motion into a displacement of a fluid through a restriction means and thus for transforming the displacement of the fluid into the generation of heat.
  • the surge motion will force a fluid (such as for example a hydraulic fluid) through the restriction means, as a result of which the kinetic energy of the fluid is transformed into heat which can be drained to the environment. As a result part of the kinetic energy of the surge motion is transformed into heat, thus limiting the resultant surge motion.
  • a fluid such as for example a hydraulic fluid
  • the restriction means is a narrowed orifice in a line for the fluid, which line is in communication with a piston chamber of a cylinder-piston assembly of which the piston is movable in correspondence with the surge motion.
  • the surge motion (or part of the surge motion in case the damping system only dampens the surge motion of the floating structure away from the further floating or fixed structure) leads to a corresponding motion of the piston, thus displacing fluid from the piston chamber into the fluid line and through the narrowed orifice. It is noted that 'corresponding motion' not necessarily means that the surge motion and the motion of the piston are equally large.
  • the cylinder of the cylinder piston assembly is connected to the floating structure, whereas the piston of the cylinder piston assembly is connected to a point externally of the floating structure of which the distance to the floating structure varies as a result of the surge motion.
  • the main part of the damping system is part of the floating structure and can be used in combination with several further floating or fixed structures and is always at hand when needed.
  • said point externally of the floating structure is part of the further floating or fixed structure.
  • said point externally of the floating structure is part of the further floating or fixed structure.
  • this may mean that the piston of the cylinder piston assembly is connected to a fixed tower.
  • 'connected' is to be understood as comprising an indirect connection too, for example by means of intermediate constructive members (which, however, generally will have a stationary position relative to, in this example, the fixed tower).
  • the second possibility comprises embodiments in which said point externally of the floating structure is part of the connecting structure.
  • the connecting structure comprises first and second parts movable relative to each other and moveable connected to a vessel and fixed tower, respectively, said point may be located at the interconnection between said parts. Then, not only a damping of the surge motion of the vessel, but also a damping of the movement of components of such connecting structure is obtained.
  • the transformation of the surge motion into the motion of the piston may be obtained, for example, when the piston carries a pulley around which a flexible member, such as a cable, rope or alike, extends of which a first end is connected to said point externally of the floating structure and of which the second end is attached to the floating structure.
  • a flexible member such as a cable, rope or alike
  • This embodiment is an example of a damping system which only dampens the surge motion of the floating structure away from the further floating or fixed structure.
  • the magnitude of the piston motion is half, or even less, the magnitude of the surge motion, thus keeping the piston motion within acceptable limits.
  • the piston of the cylinder piston assembly is provided with a pretension such as to keep the flexible member taut during the entire surge motion.
  • a pretension such as to keep the flexible member taut during the entire surge motion.
  • Such a pretension of the piston may be caused by a hydraulic actuator connected to the cylinder piston assembly.
  • a hydraulic actuator may be active but also passive (in the latter case, for example, comprising a pressurised accumulator with large volume).
  • the damping system is devised for transforming the surge motion into a relative motion between friction plates, or the damping system is devised for transforming the surge motion into the flow of an electric current through an electrical resistance.
  • One solution could be the use of a pretension winch with hydro- or electromotors.
  • the mooring assembly may be of any type, in one embodiment it is provided with a connecting structure of the type comprising pendulum members and a rigid arm assembly, which at a first end are hingedly interconnected and each at a second end are connected to the floating structure and further floating or fixed structure, respectively, and further comprising ballast weights at the interconnected ends.
  • a vessel 1 (for example a tanker) is moored to a fixed tower 2 anchored to the seabed 3.
  • the mooring assembly for mooring the vessel 1 is of the type comprising pendulum members 4 and rigid arm assemblies 5, which at a first end 6,7 are hingedly interconnected and each at a second end 8,9 are hingedly connected to the vessel 1 and fixed tower 2, respectively, and further comprising ballast weights 10 at the interconnected first ends 6,7.
  • the ballast weights 10 are rigidly connected to the first end 7 of the rigid arm assemblies 5.
  • the pendulum members 4 at their second ends 8 are connected to support arms 11 mounted on the vessel 1.
  • the connection between the second ends 9 of the rigid arm assemblies 5 and the fixed tower 2 occurs through a turntable 12 rotatably supported on the fixed tower 2 around a vertical axis 13.
  • the mooring assembly defines a connecting structure acting with the vessel as a mass spring system with respect to at least the reciprocating surge motion (movement along the longitudinal axis) between the vessel 1 and the fixed tower 2 in a manner known and thus not described in detail here. It is noted only that such a reciprocating surge motion can become undesirably large when the mass spring system (connecting structure with vessel) is excited in or close to its natural frequency (generally as a result of environmental loads, such as current, waves and wind).
  • the mooring system is provided with a damping system 14 for damping said surge motion.
  • the damping system 14 only dampens the surge motion of the vessel 1 in its stage away from the fixed tower 2 (which, of course, results in damping the entire surge motion and, thus, also any swaying motion of other components, e.g. the ballast weight 10).
  • the damping system 14 comprises a cylinder piston assembly with a cylinder 15 mounted to the vessel 1 and a piston 16 movable relative to the cylinder 15.
  • the piston 16 at its free end is provided with a pulley 17 around which a flexible member 18 (cable, rope etc.) extends.
  • a first end 19 of the flexible member 18 is attached to the fixed tower 2 (or to the turntable 12 thereof) whereas a second end 20 of the flexible member is attached to the vessel 1.
  • a bypass line 21 ends extends between a piston chambers at one end of the piston head 22 and a hydraulic control unit 25, and comprises a restriction 23 (e.g. a narrowed orifice).
  • a restriction 23 e.g. a narrowed orifice
  • the damping system is devised for transforming the surge motion (movement of the vessel 1 away from the fixed tower 2) into a displacement of a fluid through said restriction 23 and thus for transforming the displacement of the fluid into the generation of heat.
  • this movement away from the fixed tower is dampened (and therefore the entire surge motion).
  • the piston 16 of the cylinder piston assembly has to be connected to a point externally of the vessel 1 of which the distance to the vessel varies as a result of the surge motion.
  • said point externally of the vessel 1 is part of the fixed tower 2.
  • said point externally of the vessel 1 is part of the connecting structure, and for example located at the ballast weights 10 or rigid arm assemblies 5. In such a case also a sideways motion of such components could be dampened by the damping system.
  • the piston 16 of the cylinder piston assembly is provided with a pretension such as to keep the flexible member 18 taut during the entire surge motion, and especially when the vessel 1 closes in to the fixed tower 2.
  • the pretension of the piston 16 is caused by the hydraulic control unit 25 connected to the cylinder piston assembly in a manner known per se and indicated only schematically here.
  • 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.
  • the cylinder piston assembly also may be attached to the fixed tower 2 mutatis mutandis.
  • the invention for example, also applies to a situation in which pendulum members are provided which are hingedly connected to the fixed tower in stead of to the vessel.
EP07122733A 2007-12-10 2007-12-10 Ensemble d'amarrage Withdrawn EP2070812A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07122733A EP2070812A1 (fr) 2007-12-10 2007-12-10 Ensemble d'amarrage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07122733A EP2070812A1 (fr) 2007-12-10 2007-12-10 Ensemble d'amarrage

Publications (1)

Publication Number Publication Date
EP2070812A1 true EP2070812A1 (fr) 2009-06-17

Family

ID=39433839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07122733A Withdrawn EP2070812A1 (fr) 2007-12-10 2007-12-10 Ensemble d'amarrage

Country Status (1)

Country Link
EP (1) EP2070812A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102785761A (zh) * 2012-08-02 2012-11-21 江苏科技大学 自调节型单点系泊系统
CN104260831A (zh) * 2014-08-25 2015-01-07 集美大学 一种用于漂浮式波浪发电平台的系泊系统
WO2020050724A1 (fr) * 2018-09-05 2020-03-12 Apl Technology As Agencement d'absorption d'énergie pour réduire des charges d'amarrage de pointe
WO2021092385A1 (fr) * 2019-11-08 2021-05-14 Sofec, Inc. Système d'amortissement de surpression et procédés d'utilisation associées
US11267532B2 (en) 2019-04-05 2022-03-08 Sofec, Inc. Disconnectable tower yoke mooring system and methods for using same
US11279446B2 (en) 2019-04-05 2022-03-22 Sofec, Inc. Disconnectable tower yoke mooring system and methods for using same
US11319036B2 (en) 2019-08-19 2022-05-03 Sofec, Inc. Mooring systems and processes for using same
US11679844B2 (en) 2019-11-08 2023-06-20 Sofec, Inc. Mooring support structures, systems for mooring vessels, and processes for using same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2043008A (en) * 1979-03-08 1980-10-01 Bluewater Terminal Systems Nv Permanent single-point mooring system
JPS57184113A (en) * 1981-05-08 1982-11-12 Hitachi Zosen Corp Mooring of large-size float
US20010029879A1 (en) * 2000-01-07 2001-10-18 Fmc Corporation Mooring systems with active force reacting systems and passive damping
DE102004056462A1 (de) * 2004-11-23 2006-06-01 Marine-Service Gmbh Verfahren und Vorrichtung zur Verringerung von Bewegungen eines Schiffes an einer Pier
EP1826116A1 (fr) * 2006-02-23 2007-08-29 Bluewater Energy Services B.V. Système d'amarrage pour une structure flottante

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2043008A (en) * 1979-03-08 1980-10-01 Bluewater Terminal Systems Nv Permanent single-point mooring system
JPS57184113A (en) * 1981-05-08 1982-11-12 Hitachi Zosen Corp Mooring of large-size float
US20010029879A1 (en) * 2000-01-07 2001-10-18 Fmc Corporation Mooring systems with active force reacting systems and passive damping
DE102004056462A1 (de) * 2004-11-23 2006-06-01 Marine-Service Gmbh Verfahren und Vorrichtung zur Verringerung von Bewegungen eines Schiffes an einer Pier
EP1826116A1 (fr) * 2006-02-23 2007-08-29 Bluewater Energy Services B.V. Système d'amarrage pour une structure flottante

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102785761A (zh) * 2012-08-02 2012-11-21 江苏科技大学 自调节型单点系泊系统
CN104260831A (zh) * 2014-08-25 2015-01-07 集美大学 一种用于漂浮式波浪发电平台的系泊系统
WO2020050724A1 (fr) * 2018-09-05 2020-03-12 Apl Technology As Agencement d'absorption d'énergie pour réduire des charges d'amarrage de pointe
US11679843B2 (en) 2018-09-05 2023-06-20 Apl Norway As Energy absorption arrangement for reducing peak mooring loads
US11267532B2 (en) 2019-04-05 2022-03-08 Sofec, Inc. Disconnectable tower yoke mooring system and methods for using same
US11279446B2 (en) 2019-04-05 2022-03-22 Sofec, Inc. Disconnectable tower yoke mooring system and methods for using same
US11319036B2 (en) 2019-08-19 2022-05-03 Sofec, Inc. Mooring systems and processes for using same
WO2021092385A1 (fr) * 2019-11-08 2021-05-14 Sofec, Inc. Système d'amortissement de surpression et procédés d'utilisation associées
US11560203B2 (en) 2019-11-08 2023-01-24 Sofec, Inc. Surge damping systems and processes for using same
US11679844B2 (en) 2019-11-08 2023-06-20 Sofec, Inc. Mooring support structures, systems for mooring vessels, and processes for using same

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