EP2712800B1 - Schwimmobjekt mit einem dauerhaften Verankerungssystem und Verankerungsleine - Google Patents

Schwimmobjekt mit einem dauerhaften Verankerungssystem und Verankerungsleine 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
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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.)
Ceased
Application number
EP12186678.4A
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English (en)
French (fr)
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EP2712800A1 (de
Inventor
Willem Sievert Ganzinga
Reinder Jorritsma
Moritz Palm
Jaap Jan van Nielen
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Bluewater Energy Services BV
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Bluewater Energy Services BV
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Publication date
Application filed by Bluewater Energy Services BV filed Critical Bluewater Energy Services BV
Priority to EP12186678.4A priority Critical patent/EP2712800B1/de
Priority to PCT/EP2013/070036 priority patent/WO2014049034A1/en
Priority to CA2884782A priority patent/CA2884782A1/en
Publication of EP2712800A1 publication Critical patent/EP2712800A1/de
Application granted granted Critical
Publication of EP2712800B1 publication Critical patent/EP2712800B1/de
Ceased 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. Schwimmender Gegenstand (1), ausgestattet mit einem dauerhaften Verankerungssystem zum Befestigen des schwimmenden Gegenstands an wenigstens einem Anker (8) auf einem Meeresboden, wobei das Verankerungssystem wenigstens ein Verankerungstau (9) und wenigstens eine Führungselement (10), das angeordnet ist, um das Verankerungstau (9) von der Außenseite des schwimmenden Gegenstands (1) zur Innenseite des schwimmenden Gegenstands (1) so zu führen, dass das obere Ende (15) des Verankerungstaus (9) an einem anderen Ort als dem außenseitigen Kontaktort zwischen dem Verankerungstau (9) und dem schwimmenden Gegenstand (1) an dem schwimmenden Gegenstand (1) befestigt werden kann, umfasst;
    dadurch gekennzeichnet, dass das Verankerungstau (9) umfasst:
    einen relativ langen Hauptverankerungstauabschnitt (9b) aus einem Material, das eine relativ geringe axiale Steifheit aufweist; und
    einen relativ kurzen oberen Verankerungstauabschnitt (9a) aus einem synthetischen Material, das eine relativ hohe axiale Steifheit aufweist;
    wobei bei Verwendung das untere Ende des Hauptverankerungstauabschnitts (9b) am Anker (8) befestigt ist, das obere Ende des Hauptverankerungstauabschnitts (9b) am unteren Ende des oberen Verankerungstauabschnitts (9a) befestigt ist, der obere Verankerungstauabschnitt (9a) sich durch das Führungselement (10) erstreckt und das obere Ende des oberen Verankerungstauabschnitts (9a) am schwimmenden Gegenstand (1) befestigt ist.
  2. Schwimmender Gegenstand nach Anspruch 1, wobei das synthetische Material, das eine relativ hohe axiale Steifheit aufweist, ein extrem stabiles Fasernmaterial ist.
  3. Schwimmender Gegenstand nach Anspruch 2, wobei das extrem stabile Fasernmaterial aus einer Gruppe ausgewählt ist, bestehend aus: einem Polyethylen mit extrem hohem molekularem Gewicht, beispielsweise Dyneema™ oder Spestra™, einem Aramid, beispielsweise Twaron™ oder Kevlar™, einem warm gehärteten flüssigkristallinen Polyoxazolin, beispielsweise PBO™ oder Zylon™, einem thermotrophischen Flüssigkristallpolymer, beispielsweise Vectran™ oder Zenite™, Karbon, einem Polyester.
  4. Schwimmender Gegenstand nach irgendeinem der vorherigen Ansprüche, wobei das Führungselement (10) eine Verankerungsleinenkontaktfläche (17) umfasst, die aus einem abnutzungsfesten Material hergestellt ist im Verhältnis zu dem Material des oberen Verankerungstauabschnitts (9a) oder einer umgebenden Schutzhülle (13), wie zum Beispiel einer Beschichtung oder Ummantelung.
  5. Schwimmender Gegenstand nach Anspruch 4, wobei das abnutzungsfeste Material aus einer Gruppe ausgewählt ist, bestehend aus: Epoxid, Polymer, Polyamid, Polyester, Polyurethan.
  6. Schwimmender Gegenstand nach Anspruch 4, wobei das abnutzungsfeste synthetische Material eine synthetische Verbundmaterialmatrix mit einem Füllstoff aus verschiedenen Materialien, wie zum Beispiel PTFE, FEB oder Graphitteilchen, umfasst.
  7. Schwimmender Gegenstand nach den Ansprüchen 4, 5, oder 6, wobei das abnutzungsfeste synthetische Material des Führungselements (10) ein Material mit geringer Reibung ist im Verhältnis zu dem Material des oberen Verankerungstauabschnitts (9a) oder einer umgebenden Schutzhülle (13).
  8. Schwimmender Gegenstand nach irgendeinem der vorherigen Ansprüche, wobei das Führungselement (10) ein trompetenförmiges äußeres Ende (12) umfasst, auf dessen Innenfläche die Kontaktfläche (17) vorliegt.
  9. Schwimmender Gegenstand nach irgendeinem der vorherigen Ansprüche, wobei in Verwendung das äußere Ende (12) des Führungselements (10) unter dem oberen Wasserniveau liegt.
  10. Schwimmender Gegenstand nach irgendeinem der vorherigen Ansprüche, wobei in Verwendung der Ort, an dem das Verankerungstau (9) am schwimmenden Objekt (1) befestigt ist, oberhalb des oberen Wasserniveaus liegt.
  11. Schwimmender Gegenstand nach irgendeinem der vorherigen Ansprüche, wobei ein Teil des oberen Verankerungstauabschnitts (9a), der dafür vorgesehen ist, die Verankerungsleinenkontaktfläche (17) zu berühren, mit einer Schutzhülle (13) ausgestattet ist, um Abnutzung zu vermeiden.
  12. Schwimmender Gegenstand nach irgendeinem der vorherigen Ansprüche, wobei der Hauptverankerungstauabschnitt (9b) aus einem synthetischen Material hergestellt ist.
  13. Schwimmender Gegenstand nach irgendeinem der vorherigen Ansprüche, wobei sowohl der Hauptverankerungstauabschnitt (9b) als auch der obere Verankerungstauabschnitt (9a) Seile aus verflochtenem Garn sind, wobei das obere Ende des Hauptverankerungstauabschnitts (9b) am unteren Ende des oberen Verankerungstauabschnitts (9a) durch sich verflechtende Garne beider Enden befestigt ist.
  14. Schwimmender Gegenstand nach irgendeinem der vorherigen Ansprüche, wobei der schwimmende Gegenstand (1) eine schwimmende Meerenergieumwandlungsplattform, eine Einpunktverankerungsboje oder eine schwimmende Hochsee-Öl- oder Gasplattform ist.
  15. Verwendung eines Verankerungstaus (9) in einem dauerhaften Verankerungssystem eines schwimmenden Gegenstands (1),
    wobei der schwimmende Gegenstand an wenigstens einem Anker (8) auf einem Meeresboden befestigt ist,
    wobei das Verankerungssystem wenigstens ein Führungselement (10) umfasst, das angeordnet ist, um das Verankerungstau (9) von der Außenseite des schwimmenden Gegenstands (1) zur Innenseite des schwimmenden Gegenstands (1) zu führen, und wobei das obere Ende (15) des Verankerungstaus (9) am schwimmenden Gegenstand (1) an einem anderen Ort als dem außenseitigen Kontaktort zwischen dem Verankerungstau (9) und dem schwimmenden Gegenstand (1) an dem schwimmenden Gegenstand (1) befestigt ist,
    dadurch gekennzeichnet, dass das Verankerungstau umfasst:
    einen relativ langen Hauptverankerungstauabschnitt (9b) aus einem Material, das eine relativ geringe axiale Steifheit aufweist; und
    einen relativ kurzen oberen Verankerungstauabschnitt (9a) aus einem synthetischen Material, das eine relativ hohe axiale Steifheit aufweist;
    wobei das untere Ende des Hauptverankerungstauabschnitts (9b) am Anker (8) befestigt ist, das obere Ende des Hauptverankerungstauabschnitts (9b) am unteren Ende des oberen Verankerungstauabschnitts (9a) befestigt ist, der obere Verankerungstauabschnitt (9a) sich durch das Führungselement (10) erstreckt und das obere Ende des oberen Verankerungstauabschnitts (9a) am schwimmenden Gegenstand (1) befestigt ist.
EP12186678.4A 2012-09-28 2012-09-28 Schwimmobjekt mit einem dauerhaften Verankerungssystem und Verankerungsleine Ceased EP2712800B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12186678.4A EP2712800B1 (de) 2012-09-28 2012-09-28 Schwimmobjekt mit einem dauerhaften Verankerungssystem und Verankerungsleine
PCT/EP2013/070036 WO2014049034A1 (en) 2012-09-28 2013-09-26 A floating object provided with a permanent mooring system and a mooring line
CA2884782A CA2884782A1 (en) 2012-09-28 2013-09-26 A floating object provided with a permanent mooring system and a mooring line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12186678.4A EP2712800B1 (de) 2012-09-28 2012-09-28 Schwimmobjekt mit einem dauerhaften Verankerungssystem und Verankerungsleine

Publications (2)

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

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EP12186678.4A Ceased EP2712800B1 (de) 2012-09-28 2012-09-28 Schwimmobjekt mit einem dauerhaften Verankerungssystem und Verankerungsleine

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

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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

Family Cites Families (3)

* 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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EP2712800A1 (de) 2014-04-02
WO2014049034A1 (en) 2014-04-03
CA2884782A1 (en) 2014-04-03

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