US20160059936A1 - Anchoring system - Google Patents

Anchoring system Download PDF

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Publication number
US20160059936A1
US20160059936A1 US14/783,987 US201414783987A US2016059936A1 US 20160059936 A1 US20160059936 A1 US 20160059936A1 US 201414783987 A US201414783987 A US 201414783987A US 2016059936 A1 US2016059936 A1 US 2016059936A1
Authority
US
United States
Prior art keywords
mooring system
hawser
fairlead
chafing
ship
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.)
Abandoned
Application number
US14/783,987
Other languages
English (en)
Inventor
Per-Anders ÅKERSTRÖM
Christer WOCKATZ
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.)
Bassoe Technology AB
Original Assignee
Bassoe Technology AB
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 Bassoe Technology AB filed Critical Bassoe Technology AB
Assigned to BASSOE TECHNOLOGY AB reassignment BASSOE TECHNOLOGY AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ÅKERSTRÖM, Per-Anders, WOCKATZ, Christer
Publication of US20160059936A1 publication Critical patent/US20160059936A1/en
Abandoned 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
    • B63B21/04—Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • 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
    • 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
    • B63B21/04—Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • B63B21/06—Bollards
    • 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
    • B63B21/04—Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • B63B21/10—Fairleads
    • 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
    • B63B21/16—Tying-up; Shifting, towing, or pushing equipment; Anchoring using winches
    • 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
    • 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
    • B63B2021/203—Mooring cables or ropes, hawsers, or the like; Adaptations thereof

Definitions

  • the present invention relates to a mooring system for mooring a floating object to another object, the mooring system comprising a hawser and the hawser comprising two rope segments.
  • Hawser is a nautical term for a thick cable or rope used in mooring or towing. Mooring refers to any means of attaching a vessel to an object such as a bollard, pier, quay, other floating object/vessel or a mooring.
  • a hawser that is long enough to provide sufficient elastic to allow the vessel to move due to movements in waves. If a boat is tied with a short and/or stiff hawser while offshore mooring, it cannot move when in large waves and could be swamped or it could result in excessive loads in the mooring hawsers. A more elastic hawser will allow movement both up and down as well as significant side movement to avoid to become swamped or to avoid excessive loads in the mooring hawser.
  • An object of the present invention is to provide an improved mooring system. This can be achieved by the mooring system as described in the detailed embodiments below.
  • the present invention discloses a mooring system comprising a hawser and a first and a second object, wherein at least said first object is adapted to be floating.
  • the hawser of the mooring system is provided a first end attached to said first object, and a second end attached to said second object, such that the hawser thereby moors the two objects to each other.
  • the hawser comprises at least two rope segments with an intermediate chafing member arranged between the at least two rope segments, wherein the intermediate chafing member runs via a fairlead and said fairlead is arranged adjacent a side of said first object, which side facing the second object and said first end being attached to an attachment point on said first object, which attachment point is arranged distanced to said fairlead.
  • the attachment point of the first object is provided at a distance to said fair lead at least corresponding to a length of said chafing member.
  • ends of the hawser is meant where the hawser is attached to the first and the second object.
  • the actual rope segment can be extending beyond an attachment point to the objects. An extension of the rope segments beyond the attachment point does however not have any technical benefits in relation to the objects of the present invention.
  • the rope segments is adapted to have an inner elasticity in relation to said chafing member, whereby the relation between the rope segments elasticity and the chafing members elasticity is such that the chafing member can be considered to be stiff and the rope segments to be elastic.
  • the chafing member is adapted to have a high friction durability in relation to said rope segments, whereby the relation between the chafing member's friction durability and the rope segments durability is such, that said chafing member can withstand friction loads without any substantial damages, which friction loads would wear down said rope segments.
  • a relation between the length of the intermediate chafing member and the distance between the intermediate chafing member and the attachment point is such, that it allows a stretching of the rope segment compensating for normal motions of the first object and still maintaining the intermediate chafing member within the fairlead.
  • the distance between the fairlead and said attachment point is such, that at least the length of the rope segment between the intermediate chafing member and the attachment point, at least corresponds to the length of the intermediate chafing member. Further, the distance between the intermediate chafing member and the attachment point is such, that it allows a stretching of the rope segment compensating for the stiffness of the chafing member, such that the elasticity of the inventive hawser at least corresponds to single rope hawser with the length corresponding of the first rope segment and the intermediate chafing member of the present invention.
  • the construction of the inventive hawser with an intermediate chafing member allows the second rope segment to be longer, due to that it can be attached further away from the side of the first object facing the second object, whereby a greater elasticity in the hawser can be achieved than in previously known hawsers, due to the increased total length of rope segments.
  • the fairlead creates a joint in which side forces upon the hawser is absorbed when the first and the second objects career relative each other.
  • the fairlead thereby enables that the rope segments on each side can be subjected to lengthwise directed forces only and further that the first end can be attached at a point of the first object located distanced from the side facing the second object.
  • distanced is meant; the distance along the second rope segment from the intermediate chafing member to the attachment point, whereby the rope segment might pass guiding points, changing the direction of the rope segment, on its way to the attachment point.
  • the hawser can thereby become an increased length that in most cases is close to twice the length compared to prior art solutions.
  • the rope segments having some elasticity will thus totally give a more elastic mooring in this system.
  • a rope is generally more elastic than a cable or chain and the hawser will thus have added elasticity with two rope segments.
  • the invention combines the advantages with mooring with a rope, which provides elasticity with the advantages with mooring with a more durable hawser member such as a chain or wire.
  • distance of said attachment point of said first object to said fairlead at least corresponds to half a distance between said fairlead and said second end or at least corresponding to the distance between said fairlead and said second end.
  • the fairlead and the attachment point of said first object is arranged such relative each other that said chafing member leaves said fairlead with an angle between 0 and 90 degrees from said fairleads main opening direction, or preferably with an angle between 0 and 45 degrees from said fairleads main opening direction, or even more preferably with an angle between 0 and 25 degrees from said fairleads ( 6 ) main opening direction.
  • the second object can be provided with a fairlead in corresponding manner, whereby the hawser is provided with another intermediate chafing member adapted to run via said fairlead upon the second object and having a third rope segment attached thereto in order to attach to the second object.
  • the elasticity of the hawser can thereby be increased even more due to the added length of stretchable rope.
  • the chafing member of the hawser is a chafing chain.
  • the part of the hawser in contact with the fairlead will apart from the pulling force have a friction load and it will thus be advantageous to have a chain instead of a rope and thereby increasing the lifetime of the hawser.
  • the chafing member of the hawser is a chafing cable which will also extend the lifetime as compared to a rope.
  • the rope is made from nylon or polyester.
  • Nylon and polyester presents increased elasticity as well as being lighter than a wire or chain.
  • the fair lead is a hawser pipe arranged such that the hawser runs through the pipe.
  • a pipe do not require that much maintenance as for instance with a pulley and a hawser pipe can also be made quite light.
  • the system comprises two hawsers. This allows for better control of the lateral balance of the object with the main part of the hawser system. If further strength is desired the mooring system could be made using two pairs of hawsers. Further hawsers could of course be added if the required strength is very high.
  • a parallel arrangement of a plurality of inventive hawsers increases the strength of the mooring system.
  • a plurality of inventive hawsers are arranged parallel with each other between the first and second object, especially is a pair of hawsers arranged parallel or a two pairs of hawsers.
  • the mooring system comprises a bridle holding the fairlead and that is fastened to the object by using pad eyes or other means of fastening.
  • Pad eyes can be produced using different methods.
  • the floating object is a semi-submersible platform.
  • the bridle holds the fair lead underneath the deck-structure and is at least fastened to columns of the semi-submersible platform located on the side closest to the other object.
  • the floating object is a ship-shaped structure, such as a ship or a barge.
  • the mooring system is preferably arranged on the sides of ship.
  • the bow or stern of the floating object is positioned towards the other object, the fairlead is arranged adjacent the end of the ship-shaped structure facing the other object and wherein the hawser run along the side of the ship-shaped structure and having one end attached to the farther half of the ship-shaped structure.
  • the hawser runs within a pipe along the side of the ship-shaped structure. More preferably is of course to have hawsers on both sides of the ship-shaped structure and thus pipes on both sides.
  • the other object is according to one aspect of the present invention also a floating object.
  • the other object is a tension leg platform.
  • the surface of the hawser pipe has a coating for either decreasing the friction or protection against corrosion or both of these. This could for instance be applied using hot spraying the hawser pipe with thermal spraying and zinc/aluminium powder or cold and hot spraying of polymeric solutions.
  • FIG. 1 is a schematic bottom view of a mooring system used in an embodiment with the floating object being a platform.
  • FIG. 2 is a schematic side view of a mooring system according to the invention.
  • FIG. 1 shows an inventive mooring system 1 for mooring a floating object 2 to another object 3 .
  • the mooring system comprises the first and the second object 2 , 3 and four hawsers 4 which are attached to a first and the second object 2 , 3 with their first and second end 13 , 14 respectively.
  • the floating object 2 is a platform equipped with the fairleads in the form hawser pipes 6 .
  • the hawsers 4 run through of hawser pipes 6 , thereby creating a joint about which the hawser can bend when the first and the second object 2 , 3 moves relative each other.
  • the hawser 4 comprises two rope segments 10 , 10 ′ which are made of an elastic material such as a nylon or polyester rope.
  • the two rope segments 10 , 10 ′ are separated by a chafing chain 9 .
  • the chafing chain 9 is more durable concerning the friction against the hawser pipe 6 than the rope segments 10 , 10 ′.
  • the hawser 4 has its second end 14 attached to the second object 3 and the first end 13 is attached to the first object 2 adjacent the side 8 facing away from the second object 3 .
  • the hawser 4 of the present invention is longer by as much as the first object allows, i.e. decided by the length of the object 2 .
  • FIG. 1 What also is shown in FIG. 1 is that there are two pairs of parallel hawsers 4 for increased strength of the mooring system.
  • the hawser pipes 6 are held together laterally with bridles 11 and fixed at both sides using pad eyes 12 .
  • FIG. 2 can be seen a side view of the mooring system 1 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Bridges Or Land Bridges (AREA)
US14/783,987 2013-04-12 2014-04-11 Anchoring system Abandoned US20160059936A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1350466-7 2013-04-12
SE1350466A SE538099C2 (sv) 2013-04-12 2013-04-12 Ett förtöjningssystem
PCT/SE2014/050446 WO2014168572A1 (en) 2013-04-12 2014-04-11 A mooring system

Publications (1)

Publication Number Publication Date
US20160059936A1 true US20160059936A1 (en) 2016-03-03

Family

ID=51690151

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/783,987 Abandoned US20160059936A1 (en) 2013-04-12 2014-04-11 Anchoring system

Country Status (6)

Country Link
US (1) US20160059936A1 (sv)
CN (1) CN105377687B (sv)
BR (1) BR112015025395A2 (sv)
SE (1) SE538099C2 (sv)
SG (1) SG11201507956XA (sv)
WO (1) WO2014168572A1 (sv)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114435537A (zh) * 2022-01-25 2022-05-06 中国一冶集团有限公司 用以抛石作业的船舶定位装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109823478A (zh) * 2018-12-29 2019-05-31 南通中远船务工程有限公司 一种海上支持平台靠泊连接系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164378A (en) * 1977-09-02 1979-08-14 Samson Ocean Systems, Inc. Rope fitting
US5522336A (en) * 1990-01-15 1996-06-04 Petroleo Brasileiro S.A. Method and system for the casting of anchors and mooring of platforms and anchor casting unit for same
US5730425A (en) * 1995-08-15 1998-03-24 Gec Alsthom Limited Method and apparatus for paying out, securing and hauling in a flexible elongate tensile member
US20130220201A1 (en) * 2012-02-28 2013-08-29 Seahorse Equipment Corp. Method and Apparatus for Hawser Connection in a TLP - TAD System

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371371A1 (fr) * 1976-11-22 1978-06-16 Emh Perfectionnements aux moyens pour proteger les cables, notamment les aussieres, a leur passage a travers les organes creux de guidage
GB2139977A (en) * 1983-04-13 1984-11-21 Copson George Collingwood Semi-submersible marine platform
US6619223B2 (en) * 2001-05-01 2003-09-16 Drillmar, Inc. Tender with hawser lines
AU2002256234B2 (en) * 2001-05-01 2008-03-13 Itrec, B.V. Multipurpose unit with multipurpose tower and method for tendering with a semisubmersible
US7383784B2 (en) * 2005-11-30 2008-06-10 Technip France Lashing of tender assist drilling unit to a floating production facility
DK2154059T3 (da) * 2008-08-08 2011-09-05 Bluewater Energy Services Bv Fortøjningskædeforbindelsessamling til en flydende indretning
EP2496469B1 (en) * 2009-11-08 2018-07-25 Jurong Shipyard Pte. Ltd. Offshore buoyant drilling, production, storage and offloading structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164378A (en) * 1977-09-02 1979-08-14 Samson Ocean Systems, Inc. Rope fitting
US5522336A (en) * 1990-01-15 1996-06-04 Petroleo Brasileiro S.A. Method and system for the casting of anchors and mooring of platforms and anchor casting unit for same
US5730425A (en) * 1995-08-15 1998-03-24 Gec Alsthom Limited Method and apparatus for paying out, securing and hauling in a flexible elongate tensile member
US20130220201A1 (en) * 2012-02-28 2013-08-29 Seahorse Equipment Corp. Method and Apparatus for Hawser Connection in a TLP - TAD System

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114435537A (zh) * 2022-01-25 2022-05-06 中国一冶集团有限公司 用以抛石作业的船舶定位装置

Also Published As

Publication number Publication date
CN105377687A (zh) 2016-03-02
SE538099C2 (sv) 2016-03-01
SG11201507956XA (en) 2015-10-29
WO2014168572A1 (en) 2014-10-16
CN105377687B (zh) 2017-07-07
BR112015025395A2 (pt) 2017-07-18
SE1350466A1 (sv) 2014-10-13

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AS Assignment

Owner name: BASSOE TECHNOLOGY AB, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AKERSTROEM, PER-ANDERS;WOCKATZ, CHRISTER;SIGNING DATES FROM 20151207 TO 20151209;REEL/FRAME:037832/0676

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION