EP2712800B1 - Objet flottant doté d'un système d'amarrage permanent et ligne d'amarrage - Google Patents

Objet flottant doté d'un système d'amarrage permanent et ligne d'amarrage Download PDF

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Publication number
EP2712800B1
EP2712800B1 EP12186678.4A EP12186678A EP2712800B1 EP 2712800 B1 EP2712800 B1 EP 2712800B1 EP 12186678 A EP12186678 A EP 12186678A EP 2712800 B1 EP2712800 B1 EP 2712800B1
Authority
EP
European Patent Office
Prior art keywords
mooring line
floating object
line section
mooring
secured
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.)
Not-in-force
Application number
EP12186678.4A
Other languages
German (de)
English (en)
Other versions
EP2712800A1 (fr
Inventor
Willem Sievert Ganzinga
Reinder Jorritsma
Moritz Palm
Jaap Jan van Nielen
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
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Bluewater Energy Services BV
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Filing date
Publication date
Application filed by Bluewater Energy Services BV filed Critical Bluewater Energy Services BV
Priority to EP12186678.4A priority Critical patent/EP2712800B1/fr
Priority to CA2884782A priority patent/CA2884782A1/fr
Priority to PCT/EP2013/070036 priority patent/WO2014049034A1/fr
Publication of EP2712800A1 publication Critical patent/EP2712800A1/fr
Application granted granted Critical
Publication of EP2712800B1 publication Critical patent/EP2712800B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof

Definitions

  • the invention relates to a floating object provided with a permanent mooring system for securing said floating object to at least one anchor on a seabed, wherein said mooring system comprises at least one mooring line and at least one guidance member arranged to guide the mooring line from the exterior of said floating object to the interior of said floating object such that the upper end of said mooring line can be secured to said floating object at a location other than the exterior contact location between said mooring line and said floating object.
  • Said floating object may for instance be a floating marine energy converter platform, a single point mooring buoy or a floating offshore oil or gas platform.
  • Period in this context means “for a longer period”, for instance several or many years.
  • the shackle/pad eye solution is straight forward but does not allow post installation adjustment of the mooring line length.
  • the use of an upper section of chain allows adjustment of the line length but requires heavy equipment for handling of the chain section.
  • both concepts require underwater activities to make the connection and are difficult to access for release/disconnect or maintenance.
  • the concepts are not designed for quick connection-disconnection, because it's is not normally a concern for those applications.
  • said mooring line comprises: a relatively long main mooring line section of a material having a relatively low axial stiffness (and the required elastic properties); and a relatively short upper mooring line section of synthetic material having a relatively high axial stiffness; wherein in use the lower end of said main mooring line section is secured to said anchor, the upper end of said main mooring line section is secured to the lower end of said upper mooring line section, said upper mooring line section extends though said guidance member and the upper end of said upper mooring line section is secured to said floating object.
  • a high axial stiffness of the upper mooring line section will reduce wear because strain is low so the sliding motions of the pendant through the guidance member are minimized.
  • said upper mooring line section has a smaller diameter than the main mooring line section, which has the advantage that it allows for a small design of the guidance member, and decreases the bending stiffness of the upper mooring line.
  • said synthetic material having a relatively high axial stiffness is an ultra-strong fibre material.
  • said ultra-strong fibre material is chosen from the group consisting of: an ultra-high-molecular-weight polyethylene, for instance Dyneema TM or Spectra TM , an aramid, for instance Twaron TM or Kevlar TM , a thermoset liquid crystalline polyoxazole, for instance PBO TM or Zylon TM , a thermotropic liquid-crystal polymer, for instance Vectran TM or Zenite TM , carbon, a polyester.
  • the core of said upper mooring line section may be a different, axially stiff material than the outer layer, which may be a wear resistant material.
  • said guidance member comprises a mooring line contact surface which is made of a wear resistant material relative to the upper mooring line or a wear protective sleeve around it, such a s a coating or a cladding. More preferably said wear resistant material is chosen from the group consisting of: epoxy, polymer, polyamide, polyester, polyurethane, or said wear resistant synthetic material comprises a composite synthetic material matrix with a filler of different materials, such as PTFE, FEP or graphite particles. Said wear resistant synthetic material is preferably a low friction material relative to the upper mooring line or a wear protective sleeve around it.
  • said guidance member comprises a trumpet shaped outer end, on the inner surface of which said line contact surface is present.
  • Such a guidance member as such is known for example from international patent application WO 2009/127832 , which is incorporated herein by reference.
  • the geometry of the guidance member has said trumpet like shape to support the upper mooring line section in at least two degrees of freedom.
  • the geometry is designed to reduce bending fatigue.
  • the material is selected to provide minimal wear in the contact area with the upper mooring line section.
  • the outer end of said guidance member is below the upper water level. And preferably the location where the mooring line is secured to the floating object is above the upper water level. This allows for a dry and direct connection of the synthetic mooring lines at the deck of the floating object while the point of action of the force remains under the water line.
  • a part of the upper mooring line section which is intended to contact the mooring line contact surface is provided with a protective sleeve.
  • the main mooring line may be a steel wire or chain
  • the main mooring line section is also made of a synthetic material .
  • both the main mooring line section and the upper mooring line section are ropes of intertwined yarns, wherein the upper end of said main mooring line section is secured to the lower end of said upper mooring line section by intertwining yarns of both ends.
  • the main mooring line section and the upper mooring line section are connected by a splice eye and shackle connection.
  • the invention also relates to a mooring line for use in the mooring system of the floating object, comprising: a relatively long main mooring line section of a material having a relatively low axial stiffness; and a relatively short upper mooring line section of synthetic material having a relatively high axial stiffness; wherein one end of said main mooring line section is secured to one end of said upper mooring line section.
  • FIG. 1 and 2 the part of a floating object 1 which is relevant for the current invention is shown, said object 1 comprising a substantially cylindrical hollow body 2.
  • the floating object 1 is secured to anchors 8 on the seabed by four mooring lines 9, two at each end of the hollow body 2.
  • the mooring lines 9 need to have a certain elasticity.
  • FIG. 3 A cross section of the upper part of the mooring line system is shown in Figure 3 .
  • the mooring line 9 consist of two different parts: a relatively long main mooring line section 9b of a material having a relatively low axial stiffness and a relatively short upper mooring line section 9a of synthetic material having a relatively high axial stiffness.
  • the high strength and axially stiff material of the upper mooring line section 9a can for instance be any fibre based rope as for example, but not limited to, ultra-high-molecular-weight polyethylene, aramide, liquid crystal polymer, polyester, Dyneema TM , PBO TM , Zylon TM , Spectra TM , Vectran TM , Twaron TM , Technora TM , Kevlar TM , Zenite TM , carbon, etcetera.
  • the material of the main mooring line section 9b can be any suitable synthetic line. However other materials for the main mooring line 9b can be used as well, for example steel wire or chain.
  • the upper mooring line section 9a and the main mooring line section 9b are ropes of intertwined yarns, and the upper end of the main mooring line section is secured to the lower end of said upper mooring line section by intertwining yarns of both ends over a suitable length in the intermediate section 9c.
  • both ends of the sections 9a and 9b may also be connected by means of for instance spliced eyes and a shackle.
  • the mooring line connection system consists of a mooring hawser pipe 10 protruding obliquely through the hull 11 of the hollow body 2.
  • the mooring line 9 is pulled through the hawser pipe 10 and connected at deck level to connection point 14 by means of spliced eye 15.
  • the guidance member 12 at the lower end of the hawser pipe 10 supports the upper mooring line section 9a under tension and limits the bending radius of the upper mooring line section 9a.
  • the part of the upper mooring line section 9a which is in contact with the trumpet mouth 16 of the guidance member 12 is covered with a braided jacket 13 to limit wear.
  • the trumpet mouth 16 of the guidance member 12 is covered with a plastic lining 17, made of a high wear resistant and low friction material relative to the outer surface of the upper mooring line.
  • the mooring line 9 will be installed by pulling the upper mooring line section 9a thought the hawser pipe 10 using a messenger line and for example a winch.
  • the upper mooring line section 9a can be secured by a suitable connection point 14.
  • the upper mooring line section 9a can be guided to a tensioning system to (automatically) adjust the line length after installation.
  • the contact area between the upper mooring line section 9a and the guidance member 12 will be most affected by wear and fatigue.
  • the lifetime of the upper mooring line section 9a can be extended by changing the point of contact of the upper mooring line section 9a with the guidance member 12. This can be achieved by for example using connection points 14 on the floating object 1 at different heights or having different length spliced eyes 15 in the upper mooring line section 9.
  • Inspection and replacement of the upper mooring line section 9a can be done without disconnecting the floating object 1.
  • the upper mooring line section 9a can be released using the pull-in line attached and inspected above water.
  • the upper mooring line section 9a together with the main mooring line section 9b can be pulled through the hawser pipe 10 for inspection.
  • This concept offers specific advantages for (semi) permanent moored floating objects 1 suitable for wave and tidal energy converter systems. It may also offer a cost effective solution for the oil and gas industry as the concept is free of any additional moving parts under water as no equipment is required other than the main mooring line section 9b and upper mooring line section 9a to resolve issues with (bending) fatigue and wear in this invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)

Claims (15)

  1. Objet flottant (1) doté d'un système de mouillage destiné à fixer ledit objet flottant à une ancre (8) au moins sur le fond de la mer, dans lequel ledit système de mouillage comprend une ligne de mouillage (9) au moins, et un élément de guidage (10) au moins agencé de façon à guider la ligne de mouillage (9) à partir de l'extérieur dudit objet flottant (1) vers l'intérieur dudit objet flottant (1) de telle sorte que l'extrémité supérieure (15) de ladite ligne de mouillage (9) puisse être fixée audit objet flottant (1) au niveau d'un emplacement autre que l'emplacement de contact extérieur entre ladite ligne de mouillage (9) et ledit objet flottant (1) ;
    caractérisé en ce que ladite ligne de mouillage (9) comprend :
    une section ligne de mouillage principale relativement longue (9b) réalisée dans un matériau qui présente une rigidité axiale relativement faible ; et
    une section ligne de mouillage supérieure relativement courte (9a) réalisée dans un matériau synthétique qui présente une rigidité axiale relativement élevée ;
    dans lequel, en service, l'extrémité inférieure de ladite section ligne de mouillage principale (9b) est fixée à ladite ancre (8), l'extrémité supérieure de ladite section ligne de mouillage principale (9b) est fixée à l'extrémité inférieure de ladite section ligne de mouillage supérieure (9a), ladite section ligne de mouillage supérieure (9a) s'étend à travers ledit élément de guidage (10) et l'extrémité supérieure de ladite section ligne de mouillage supérieure (9a) est fixée audit objet flottant (1).
  2. Objet flottant selon la revendication 1, dans lequel ledit matériau synthétique qui présente une rigidité axiale relativement élevée est un matériau de fibres ultra-résistantes.
  3. Objet flottant selon la revendication 2, dans lequel ledit matériau de fibres ultra-résistantes est sélectionné dans le groupe constitué par : un polyéthylène à poids moléculaire ultra-élevé, par exemple du Dyneema™ ou du Spectra™, un aramide, par exemple du Twaron™ ou du Kevlar™, un polyoxazole cristallin liquide thermodurci, par exemple du PBO™ ou du Zylon™, un polymère à cristaux liquides thermotrope, par exemple du Vectran™ ou du Zenite™, un carbone, un polyester.
  4. Objet flottant selon l'une quelconque des revendications précédentes, dans lequel ledit élément de guidage (10) comprend une surface de contact de ligne de mouillage (17) qui est constituée d'un matériau résistant à l'usure par rapport au matériau de la section ligne de mouillage supérieure (9a) ou d'un manchon protecteur (13) autour de celle-ci, tel qu'un revêtement ou un gainage.
  5. Objet flottant selon la revendication 4, dans lequel ledit matériau résistant à l'usure est sélectionné dans le groupe constitué par : un époxyde, un polymère, un polyamide, un polyester, un polyuréthane.
  6. Objet flottant selon la revendication 4, dans lequel ledit matériau synthétique résistant à l'usure comprend une matrice de matériau synthétique composite avec une matière de remplissage constituée de différents matériaux, tels que du PTFE, du FEP ou des particules de graphite.
  7. Objet flottant selon l'une quelconque des revendications 4 à 6, dans lequel ledit matériau synthétique résistant à l'usure de l'élément de guidage (12) est un matériau à frottements faibles par rapport au matériau de la section ligne de mouillage supérieure (9a) ou un manchon protecteur (13) autour de celle-ci.
  8. Objet flottant selon l'une quelconque des revendications précédentes, dans lequel ledit élément de guidage (10) comprend une extrémité extérieure en forme de trompette (12), sur la surface intérieure de laquelle est présente ladite surface de contact de ligne (17).
  9. Objet flottant selon l'une quelconque des revendications précédentes, dans lequel, en service, l'extrémité extérieure (12) dudit élément de guidage (10) se situe sous le niveau d'eau supérieure.
  10. Objet flottant selon l'une quelconque des revendications précédentes, dans lequel, en service, l'endroit où la ligne de mouillage (9) est fixée à l'objet flottant (1) se situe au-dessus du niveau d'eau supérieure.
  11. Objet flottant selon l'une quelconque des revendications précédentes, dans lequel une partie de la section ligne de mouillage supérieure (9a) qui est destinée à entrer en contact avec la surface de contact de la ligne de mouillage (17) est dotée d'un manchon protecteur (13) de façon à éviter une usure.
  12. Objet flottant selon l'une quelconque des revendications précédentes, dans lequel la section ligne de mouillage principale (9b) est réalisée dans un matériau synthétique.
  13. Objet flottant selon l'une quelconque des revendications précédentes, dans lequel la section ligne de mouillage principale (9b) et la section ligne de mouillage supérieure (9a) sont des câbles de fils entrelacés, dans lequel l'extrémité supérieure de ladite section ligne de mouillage principale (9b) est fixée à l'extrémité inférieure de ladite section ligne de mouillage supérieure (9a) en entrelaçant les fils des deux extrémités.
  14. Objet flottant selon l'une quelconque des revendications précédentes, dans lequel ledit objet flottant (1) est une plate-forme de convertisseur d'énergie marine flottante, une seule bouée de mouillage ou une plate-forme en mer flottante de pétrole ou de gaz.
  15. Utilisation d'une ligne de mouillage (9) dans un système de mouillage permanent d'un objet flottant (1),
    dans laquelle ledit objet flottant est fixé à une ancre (8) au moins sur le fond de la mer, dans lequel ledit système de mouillage comprend un élément de guidage (10) au moins agencé de façon à guider la ligne de mouillage (9) à partir de l'extérieur dudit objet flottant (1) vers l'intérieur dudit objet flottant (1), et dans laquelle l'extrémité supérieure (15) de ladite ligne de mouillage (9) est fixée audit objet flottant (1) au niveau d'un emplacement autre que l'emplacement de contact extérieur entre ladite ligne de mouillage (9) et ledit objet flottant (1) ;
    caractérisée en ce que la ligne de mouillage comprend :
    une section ligne de mouillage principale relativement longue (9b) réalisée dans un matériau qui présente une rigidité axiale relativement faible ; et
    une section ligne de mouillage supérieure relativement courte (9a) réalisée dans un matériau synthétique qui présente une rigidité axiale relativement élevée ;
    dans laquelle l'extrémité inférieure de ladite section ligne de mouillage principale (9b) est fixée à ladite ancre (8), l'extrémité supérieure de ladite section ligne de mouillage principale (9b) est fixée à l'extrémité inférieure de ladite section ligne de mouillage supérieure (9a), ladite section ligne de mouillage supérieure (9a) s'étend à travers ledit élément de guidage (10) et l'extrémité supérieure de ladite section ligne de mouillage supérieure (9a) est fixée audit objet flottant (1).
EP12186678.4A 2012-09-28 2012-09-28 Objet flottant doté d'un système d'amarrage permanent et ligne d'amarrage Not-in-force EP2712800B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12186678.4A EP2712800B1 (fr) 2012-09-28 2012-09-28 Objet flottant doté d'un système d'amarrage permanent et ligne d'amarrage
CA2884782A CA2884782A1 (fr) 2012-09-28 2013-09-26 Objet flottant comprenant un systeme d'ancrage permanent et une ligne d'ancrage
PCT/EP2013/070036 WO2014049034A1 (fr) 2012-09-28 2013-09-26 Objet flottant comprenant un système d'ancrage permanent et une ligne d'ancrage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12186678.4A EP2712800B1 (fr) 2012-09-28 2012-09-28 Objet flottant doté d'un système d'amarrage permanent et ligne d'amarrage

Publications (2)

Publication Number Publication Date
EP2712800A1 EP2712800A1 (fr) 2014-04-02
EP2712800B1 true EP2712800B1 (fr) 2015-08-26

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EP12186678.4A Not-in-force EP2712800B1 (fr) 2012-09-28 2012-09-28 Objet flottant doté d'un système d'amarrage permanent et ligne d'amarrage

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EP (1) EP2712800B1 (fr)
CA (1) CA2884782A1 (fr)
WO (1) WO2014049034A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6165289B1 (ja) * 2016-03-24 2017-07-19 中本パックス株式会社 耐熱容器の製造方法
US11021216B2 (en) 2019-02-20 2021-06-01 Exxonmobil Upstream Research Company Mooring line corrosion barrier and methods of manufacture and installation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431527A1 (de) * 1984-08-28 1986-03-13 Gertrud 8070 Ingolstadt Sohmen Ankerseil mit zugdaempfungsmittel
US6575072B2 (en) * 2000-11-09 2003-06-10 Gilles Pellerin Expansion joint within an anchor rode
GB2459270B (en) 2008-04-15 2012-08-15 Nylacast Ltd A chock insert for a maritime craft

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Publication number Publication date
CA2884782A1 (fr) 2014-04-03
EP2712800A1 (fr) 2014-04-02
WO2014049034A1 (fr) 2014-04-03

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