GB2553499A - Mooring tensioner - Google Patents

Mooring tensioner Download PDF

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Publication number
GB2553499A
GB2553499A GB1613248.2A GB201613248A GB2553499A GB 2553499 A GB2553499 A GB 2553499A GB 201613248 A GB201613248 A GB 201613248A GB 2553499 A GB2553499 A GB 2553499A
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GB
United Kingdom
Prior art keywords
line
mooring
mounting
chain
connector
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.)
Pending
Application number
GB1613248.2A
Other versions
GB201613248D0 (en
Inventor
Taylor Richard
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.)
Flinstone Tech Ltd
Original Assignee
Flinstone Tech Ltd
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 Flinstone Tech Ltd filed Critical Flinstone Tech Ltd
Priority to GB1613248.2A priority Critical patent/GB2553499A/en
Publication of GB201613248D0 publication Critical patent/GB201613248D0/en
Priority claimed from GB1707671.2A external-priority patent/GB2555503A/en
Priority claimed from AU2017305635A external-priority patent/AU2017305635A1/en
Publication of GB2553499A publication Critical patent/GB2553499A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/04Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • B63B21/08Clamping devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/04Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B2021/505Methods for installation or mooring of floating offshore platforms on site

Abstract

An apparatus for mooring a structure comprising a first portion 35 for receiving a portion (15b fig 1a) of a line 15, such as a mooring line, extending from a structure, such as a floating structure, offshore structure, floating platform or buoy; a guide portion 40 movably connected to the first portion for guiding the portion of the line received by the first portion; and a second portion 45 movably connected to the first and/or guide portions for connecting the apparatus to a seabed or further structure on the seabed. There may be a line engaging device 50 connected to the first portion and movable between first and second positions in response to tension. The second portion may comprise a groove 45a and/or protrusion 45b that may support a mounting element 65 connected to at least one end of a line received in the apparatus.

Description

(,2,UK Patent Application , ,GB ,,,,2553499 ,η,Α (43) Date of A Publication_14.03.2018

(21) Application No: 1613248.2 (51) INT CL: B63B 21/50 (2006.01) (22) Date of Filing: 01.08.2016 (56) Documents Cited: WO 2015/071318 A1 WO 2012/088511 A1 (71) Applicant(s): Flinstone Technology Ltd Fowler Road, West Pitkerro Industrial Estate, Dundee, WO 2010/085156 A1 US 20020189522 A1 KR20160084396 US 20050072347 A1 DD5 3RU, United Kingdom (58) Field of Search: (72) Inventor(s): Richard Taylor INT CL B63B Other: WPI & EPODOC (74) Agent and/or Address for Service: Marks & Clerk LLP 120 Bothwell Street, Glasgow, G2 7JS, United Kingdom

Title of the Invention: Mooring tensioner Abstract Title: Mooring tensioner

An apparatus for mooring a structure comprising a first portion 35 for receiving a portion (15b fig 1a) of a line 15, such as a mooring line, extending from a structure, such as a floating structure, offshore structure, floating platform or buoy; a guide portion 40 movably connected to the first portion for guiding the portion of the line received by the first portion; and a second portion 45 movably connected to the first and/or guide portions for connecting the apparatus to a seabed or further structure on the seabed. There may be a line engaging device 50 connected to the first portion and movable between first and second positions in response to tension. The second portion may comprise a groove 45a and/or protrusion 45b that may support a mounting element 65 connected to at least one end of a line received in the apparatus.

Figure GB2553499A_D0001

At least one drawing originally filed was informal and the print reproduced here is taken from a later filed formal copy.

1/8

01 18

Figure GB2553499A_D0002

Wrap Angle (degrees) Factor (T2/T1) 0 2.0 10 1.99 20 1.97 30 1.93 40 1.87 45 1.84 50 1.81 60 1.73 70 1.64 80 1.53 90 1.41

Figure 1(c)

2/8

01 18

65b

65a

Figure GB2553499A_D0003

Figure 2(b)

15b

3/8

01 18

Tensioner in service

Figure GB2553499A_D0004

Figure 3(a)

Slack(excess) chain

Figure 3(b)

During tensioning from vessel

Figure GB2553499A_D0005

4/8

01 18

Figure GB2553499A_D0006

Figure 4(a)

Figure GB2553499A_D0007

Figure 4(c) β Figure 4(b)

35a

5/8

01 18

Figure GB2553499A_D0008

Figure 5(a)

70a J®.

Figure GB2553499A_D0009
Figure GB2553499A_D0010

Figure 5(b)

Figure GB2553499A_D0011

6/8

01 18

Figure GB2553499A_D0012

7/8

01 18

L

I

Figure GB2553499A_D0013

Figure 7(a)

Figure GB2553499A_D0014

Figure 7(b)

8/8

01 18

Locating a mooring tensioner at a subsea or underwater site or location (1010) o

Connecting the rig to the mooring tensioner (1015)

Moving or pulling-in a first end of the chain to adjust tension in the chain and/or length of the chain (1020)

Figure 8

MOORING TENSIONER

FIELD OF INVENTION

The present invention relates to an apparatus for mooring a structure, e.g. to a seabed or the like, and associated devices, systems and methods.

BACKGROUND TO INVENTION

Offshore structures, such as floating structures or floating platforms, can be moored by mooring lines. This can include attaching the mooring lines to the structure to be moored and applying a pre-determined tension to each of the mooring lines. The necessary tension can be applied to the mooring lines, e.g. by using winches that may be provided on the structure to be moored. Such winches can be costly and may only be used intermittently, e.g. during the initial mooring of the structure, relocation of the structure and in response to changing conditions at the mooring site. The installation of a winch on each structure to be moored can become cost and/or time intensive.

A coupling apparatus may be used for connecting the mooring lines from the structure to a seabed. The apparatus may include a guide that can direct a free end of a mooring line towards a surface to enable adjustment of the tension in the mooring lines, e.g. by a winch located on a vessel. During tensioning of the mooring line, bending strain can act on the mooring line due it being pulled and bend around the guide of the apparatus. This can lead to increased wear and/or damages of the mooring line and/or apparatus. In order to minimise the strain on the mooring line, the size of the coupling apparatus may be increased to accommodate larger angles for guiding the mooring line towards the surface. However, this can lead to an increased costs and weight of the coupling apparatus.

This background serves only to set a scene to allow a skilled reader to better appreciate the following description. Therefore, none of the above discussion should necessarily be taken as an acknowledgement that that discussion is part of the state of the art or is common general knowledge. One or more aspects/embodiments of the invention may or may not address one or more of the background issues.

It is an object of at least one embodiment of at least one aspect of the present invention to obviate or at least mitigate at least one of the problems in the prior art.

SUMMARY OF INVENTION

According to a first aspect of the present invention there is provided an apparatus for mooring a structure, e.g. to a seabed, river or lake bed, ocean floor or the like. The apparatus may be, be utilised as or comprise an underwater apparatus for mooring a structure or a subsea apparatus for mooring a structure. A structure may be or comprise a structure to be moored or a structure that may be moored, e.g. in use. The apparatus may be configured to permit tensioning of a line coupled and/or connected to a structure. A line may be or comprise a mooring line, offshore mooring line, underwater mooring line or subsea mooring line.

The apparatus may comprise a first portion, e.g. for receiving a portion of a line extending from a structure.

The apparatus may comprise a guide portion, e.g. for guiding a/the portion of a line received by the first portion. The guide portion may be movably, e.g. pivotably or rotatably, connected or connectable to the first portion.

The apparatus may comprise a second portion, e.g. for connecting or coupling the apparatus to a seabed or a further structure located thereon. The second portion may be movably, e.g. pivotably or rotatably, connected or connectable to the first portion and/or guide portion.

The apparatus may comprise or define an axis, e.g. a rotational axis. The first portion, the second portion and/or the guide portion may be arranged to be movable, e.g. rotatable or pivotable, around or about the axis of the apparatus. In other words, the first portion, the guide portion and/or the second portion may be coaxially arranged relative to each other. The coaxial arrangement of the first portion, guide portion and/or second portion may permit the first portion, guide portion and/or second portion to be aligned relative to each other during pull-in and/or tensioning a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus or a portion thereof, e.g. in use. This may reduce out of plane strain acting on the apparatus and/or a line, e.g. in use, e.g. during pull-in and/or tensioning of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus or a portion thereof. This may lead to a reduction of losses, e.g. due to friction between a line under tension and the apparatus, e.g. during pull-in and/or tensioning of a line. It other words, the coaxial arrangement may facilitate pull-in and/or tensioning of a line.

The apparatus may comprise a line engaging device. The line engaging device may be or comprised in a chain stopper or means for engaging a chain. The line engaging device may be or comprise a means for engaging a chain as described in

WO 2015/150770 (by the present applicant), which is hereby incorporated by reference. The line engaging device may be configured to permit movement of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus, in a first direction relative to the apparatus, e.g. in a direction towards the guide portion. The line engaging device may be configured to prohibit movement of a line, e.g. a line or a portion thereof, which may be received or threaded through the apparatus, in a second direction relative to the apparatus, e.g. in a direction towards a structure. The line engaging device may be movably connected or connectable to the first portion. For example, the line engaging device may be connected to the first portion so that the line engaging device may be moveable, e.g. rotatable or privotable and/or slidable, relative to the first portion.

The line engaging device may be connected or connectable to the first portion to be movable, actuatable and/or operable between a first position and a second position. The line engaging device may be configured to be moveable, operable and/or actuatable from the first position to the second position, e.g. when tension is applied to at least one end, e.g. a free end, or at least two ends, e.g. a free end and a distal end, of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus. The line engaging device may be configured to be moveable, operable and/or actuatable from the second position to the first position, e.g. when tension is released from at least one end, e.g. a free end, of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus. For example, in use, a distal end of a line, which may be connected or connectable to a structure may be tensioned or be under tension.

The apparatus may be or be configured to be operable, moveable and/or actuatable between a first configuration and a second configuration. In the first configuration of the apparatus, the line engaging device may be in the first position. In the second configuration of the apparatus, the line engaging device may be in the second position. In the first configuration of the apparatus, the first and second portions may be arranged relative to each other such that a longitudinal axis of the first portion may be substantially in line, collinear or coaxial with a longitudinal axis of the second portion. The apparatus may be configured or arranged such that in the first configuration of the apparatus, a/the longitudinal axis of the apparatus may be substantially in line, collinear or coaxial with a longitudinal axis of a line or a portion thereof extending from a structure. The apparatus may be configured or arranged such that in the first configuration of the apparatus the axis may be substantially co-planar with a longitudinal axis of a line or portion thereof extending from a structure and/or the axis extends in a direction substantially perpendicular to a longitudinal axis of a line or portion thereof extending from a structure. In the first configuration of the apparatus, out of plane strain acting on the apparatus and/or a line may be reduced.

In the first configuration, the line engaging means may be configured to engage or be engageable with a line or portion thereof, e.g. to prevent movement of a line in the second direction.

In the second configuration of the apparatus, the first portion and second portion may be arranged relative to each other such that a/the longitudinal axis of the first portion may extend at an angle relative to a/the longitudinal axis of the second portion. The apparatus may be configured such that in the second configuration of the apparatus a/the longitudinal axis of the first portion extends at an angle, e.g. an acute angle, relative to a longitudinal axis of a line or portion thereof extending from a structure. This may reduce out of plane strain acting on the apparatus and/or a line e.g. in use, e.g. during pull-in and/or tensioning of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus or a portion thereof. This may lead to a reduction of losses, e.g. due to friction between a line under tension and the apparatus, e.g. during pull-in and/or tensioning of a line.

In the second configuration, the line engaging means may be configured to disengage or be disengageable, e.g. partially or fully disengage or be disengageable, from a line or portion thereof, e.g. to prohibit movement of a line or portion thereof in the first direction.

The apparatus may be configured or arranged, e.g. the guide portion may be connected or connectable to the first portion, such that the axis of the apparatus may extend in a direction substantially perpendicular to a/the longitudinal axis of the first portion. The apparatus may be configured or arranged, e.g. the guide portion may be connected or connectable to the first portion, such that a/the longitudinal axis of the first portion may intersect the axis of the apparatus.

The second portion may be configured to receive, mount and/or support a mounting element of a line, e.g. a mounting element connected to at least one end, e.g. a free end, of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus. For example, the second portion may mount a mounting element of a line, when tension on at least one end of a line is released. This may permit secure parking or holding of an end of a line, e.g. a free end of a line.

The second portion may be configured to align a mounting element connected to at least one end, e.g. a free end, of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus, relative to the apparatus. The second portion may be configured to align at least one end, e.g. a free end, of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus, relative to the apparatus. This may maintain a line or an end of a line, e.g. a free end of a line, in alignment relative to the apparatus. For example in cases where the line may be or comprise a chain, the configuration of the second portion may prevent misalignment or bending of parts of a chain. This may reduce strain, damage and/or wear of a line/chain. The configuration of the second portion may facilitate connection of a wire, e.g. work wire, to a line, e.g. a mounting element of a line, e.g. during a pull-in and/or tensioning process.

The apparatus may comprise a groove or recess and/or a protrusion. The groove or recess and/or protrusion may be part of or comprised in the second portion. The groove or recess and/or protrusion may be shaped for mounting and/or supporting a mounting element of a line, e.g. a mounting element connected to at least one end, e.g. a free end, of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus. The groove or recess and/or protrusion may be arranged and/or shaped to cooperate with a further protrusion of a mounting element, e.g. a mounting element connected to at least one end, e.g. a free end, of a line, e.g. a line or a portion thereof, which may be received in or threaded through the apparatus, e.g. to enable mounting of a mounting element on the apparatus, e.g. the second portion.

The apparatus may comprise a first connector portion. The first connector portion may be part of or comprised in the second portion. The first connector portion may be (provided) for complementary mating with a corresponding second connector portion. The first connector portion may be part of or comprised in a subsea or underwater connector, e.g. a subsea or underwater mooring connector. The first connector portion may be moveably, e.g. rotatably or pivotably, connected or connectable to the second portion.

The second portion may be configured to connect or couple the apparatus to another line or a portion thereof e.g. a line extending from a seabed or a further structure located thereon. The second portion may be configured to be moveably, e.g. rotatably or pivotably, connected or connectable to another line or a portion thereof, e.g. a line extending from a seabed or a further structure located thereon.

According to a second aspect of the present invention there may be provided a system for mooring a structure. The system may comprise an apparatus for mooring a structure. The apparatus may be or comprise an apparatus for mooring a structure according to the first aspect.

The system may comprise a line. The line may be or comprise a mooring line, offshore mooring line, underwater mooring line or subsea mooring line. A portion of the line may be threaded or threadable through the apparatus, e.g. in use. The line may be or comprise a chain, wire or rope or the like. A first end, e.g. a distal end, of the line may be configured to be connected or connectable to a structure. The structure may be part of or comprised in the system. The structure may be or comprise a floating structure, offshore structure, vessel, floating platform, subsea structure, underwater structure or buoy.

The line may comprise a second end, e.g. a free end. The second end of the line may be configured to be connected or connectable to a mounting element. The mounting element may be part of or comprised in the system and/or line. The mounting element may be configured to be mounted or mountable on or to the second portion of the apparatus. The mounting element comprises a further protrusion. The further protrusion may be configured, arranged and/or shaped to cooperate with a/the groove and/or protrusion of the second portion of the apparatus, e.g. to enable mounting of the mounting element on or to the apparatus. The further protrusion may be configured, arranged and/or shaped to cooperate with a/the groove and/or protrusion of the apparatus, e.g. the second portion of the apparatus, e.g. to enable alignment of the mounting element and/or the second end of the line relative to the apparatus, e.g. the second portion of the apparatus.

The system may comprise another line. The other line may be or comprise another mooring line, offshore mooring line, underwater mooring line or subsea mooring line. A first end of the other line may be configured to be connected or connectable to a seabed or a further structure located thereon. A second end of the other line may be configured to be connected, coupled, coupleable or connectable to the second portion of the apparatus.

The system comprises a connector. The connector may be or comprise a mooring connector, underwater mooring connector or subsea mooring connector. The connector may be or comprise a subsea connector as described in WO 2013/186553 (by the present applicant), which is hereby incorporated by reference. A first connector portion may be configured to be connected or connectable to the apparatus, e.g. the second portion of the apparatus. A second connector portion may be configured to be connected or connectable to a seabed or a further structure located thereon. The first portion of the connector may be configured for complementary mating with the second portion of the connector.

According to a third aspect of the present invention there is provided a method for mooring a structure. The method may comprise providing an apparatus according to the first aspect and/or a system according to the second aspect. The method may comprise locating the apparatus at a site or location e.g. a subsea or underwater site or location. The method may comprise connecting the structure to the apparatus or a portion thereof. The step of connecting may comprise comprises connecting the first end, e.g. the distal end, of a/the line to the structure and/or threading the second end, e.g. the free end, of the line through the apparatus and/or connecting.

The method may comprise connecting or coupling the apparatus to a seabed or a further structure located thereon.

The method may comprise adjusting and/or varying a tension in the line. The method may comprise applying tension to the second end of the line, e.g. by moving or pulling-in of the second end of the line or a yet further line connected to the second end of the line.

The method may comprise moving or pulling the second end of the line or a/the yet further line connected to the second end of the line, e.g. to adjust tension in the line and/or length of the line or a portion of the line extending between the apparatus and the structure, e.g. by using a pulling and/or tensioning arrangement, e.g. a winch and/or motor or the like, or an Remotely Operated Vehicle (ROV). The pulling or tensioning arrangement may be provided on a yet further structure, e.g. a vessel, floating platform, offshore structure or the like. The step of moving or pulling the first end of the line may comprise moving, actuating and/or operating the apparatus from first configuration into the second configuration.

According to a fourth aspect of the present invention there is provided a portion, e.g. for use in an apparatus for mooring a structure and/or a system for mooring a structure. The apparatus may be or comprise an apparatus for mooring a structure according to the first aspect. The system may be or comprise a system for mooring a structure according to the second aspect. The portion may be configured to receive, support and/or mount a mounting element of a line. The portion may comprise any features of the second portion of the apparatus according to the first aspect and/or the system according to the second aspect.

According to a fifth aspect of the present invention there is provided a mounting element of a line. The mounting element may be configured to be mounted or for mounting on a portion, e.g. of an apparatus for mooring a structure according to the fourth aspect.

It should be understood that the features defined above in accordance with any aspect of the present invention or below in relation to any specific embodiment of the invention may be utilised, either alone or in combination with any other defined feature, in any other aspect or embodiment of the invention.

BRIEF DESCRIPTION OF DRAWINGS

These and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

Figures 1(a) and 1(b) show schematic views of a system for mooring a structure according to one or more described example(s);

Figure 1(c) shows a table of a wrap angle and tension factor;

Figure 2(a) shows an isometric view of an apparatus for mooring a structure according to one or more described example(s);

Figure 2(b) shows a part-sectional view of the apparatus in Figure 2(a);

Figure 3(a) shows an isometric view of the apparatus of Figure 2(a) in a first configuration of the apparatus;

Figure 3(a) shows an isometric view of the apparatus of Figure 2(a) in a second configuration of the apparatus;

Figure 4(a) shows a side view of the apparatus of Figure 2(a) in the first configuration in which a first portion of the apparatus is shown as effectively transparent;

Figure 4(b) shows a side view of the apparatus of Figure 2(a) in the second configuration in which the first portion of the apparatus is shown as effectively transparent;

Figure 4(c) shows a part cutaway view of the apparatus of Figure 2(a) in the second configuration in which a part of the first portion of the apparatus is shown as effectively transparent;

Figures 5(a) and 5(b) show isometric views of the apparatus for mooring a structure according to another described example(s);

Figures 6(a) and 6(b) show isometric views of the apparatus of Figure 5(a) connected to a further structure on seabed;

Figures 7(a) and 7(b) show isometric views of the further structure on seabed of Figure 6(b); and

Figure 8 shows a flow diagram of a method for mooring a structure according to one or more described example(s).

DETAILED DESCRIPTION OF DRAWINGS

An exemplary system 5 for mooring a structure is shown in Figures 1(a) and 1(b). The system 5 includes an apparatus for mooring a structure. The apparatus may be configured to permit tensioning of a line, such as a mooring line, offshore mooring line, underwater mooring line or subsea mooring line or the like, connected to the structure. The apparatus may be provided in the form of a mooring tensioner 10 and the line may be provided in the form of a chain 15. It will be appreciated that in other examples the line may be provided in the form of a rope, synthetic, e.g. polyester, wire or the like. A first end, e.g. a distal end, 15a of the chain 15 is connected to the structure, which in this example is provided in the form of a floating platform or rig 20. It will be appreciated that in other examples, the structure may be a floating structure, offshore structure, vessel, plat form, subsea structure, underwater structure or buoy, such a submersible buoy, semisubmersible buoy or submerged turret production buoy or submerged turret loading buoy, or the like.

In the example of Figure 1(a) and 1(b), a portion 15b of the chain 15 is threaded through the mooring tensioner 10 and guided towards a vessel 22. A second end, e.g. a free end, 15c of the chain 15 is shown as being coupled to the vessel 22 and/or a pulling or tensioning arrangement, such as a winch and/or motor or the like, for adjustment of a tension and/or length of the chain 15.

As can be seen in the exemplary mooring tensioner 10 shown in Figure 1(b), a first end 25a of a further mooring line 25 can be connected to the mooring tensioner, while the second end 25b of the further mooring line 25 is connected to a seabed 30, e.g. to a further structure 30a located on the seabed 30. The further structure 30a may be provided in the form of a drag embedment anchor, vertically loaded anchor, driven pile, suction pile, suction anchor, suction embedded plate anchor or other types of anchors or structures. It will be appreciated that in other examples the mooring tensioner may be directed connected/connectable to the seabed 30 and/or the further structure 30a located thereon.

An exemplary mooring tensioner 10 is shown in Figures 1(b), 2(a) to 6(b). The mooring tensioner 10 includes a first portion 35 for receiving the portion 15b of the chain 15 that extends from the rig 20 to the mooring tensioner 10. The exemplary mooring tensioner 10 includes a guide portion for guiding the portion 15b of the chain 15 received by the first portion 35. The guide portion may be provided in the form of a chain wheel or sheave 40. In this example the chain wheel or sheave 40 is a five pocket chain wheel. It will be appreciated that in other examples other wheels, such as wheels without any pockets or a more or less than five pockets, may be utilised as a guide portion. The chain wheel 40 is movably connected, such as rotatably or pivotably connected, to the first portion 35. The mooring tensioner 10 includes a second portion 45 for connecting or coupling the mooring tensioner 10 to the seabed 30 and/or the further structure 30a located thereon. It will be appreciated that the second portion 45 may be configured to connect the mooring tensioner 10 directly or indirectly to the seabed 30 and/or the further structure 30a located thereon, as will be described below. The second portion 45 is movably connected, such as pivotably or rotatably connected, to the first portion 35 and/or the chain wheel 40.

The mooring tensioner 10 includes an axis A, which may be provided in the form of a rotational axis A. The axis A may be provided by an elongate member, which may be in the form of a first load pin or pin 47. The first portion 35, the second portion 45 and/or the chain wheel 40 are arranged to be movable, such as rotatable or pivotable, around or about the axis A, e.g. the pin 47, of the mooring tensioner 10. In other words, the first portion 35, the chain wheel 40 and/or the second portion 45 are coaxially arranged relative to each other. The coaxial arrangement of the first portion 35, chain wheel 40 and/or second portion 45 may permit the first portion 35, chain wheel 40 and/or second portion 45 to be aligned relative to each other during pullin/tensioning of the chain 15, e.g. by the pulling and/or tensioning arrangement. This may reduce out of plane strain acting on the mooring tensioner 10 and the chain 15, e.g. during pulling-in/tensioning of the chain 15.

Referring back to Figures 1(a) to 1(c), tension T2 acting on the further mooring line can be greater than tension T1 on the chain 15, which may be applied by or due to the vessel 22 and/or the rig 20. The extent to which the load/tensioning from the vessel 22 can be increased can depend of a wrap angle Θ of the chain 15 around the chain wheel 40. As can be seen from the table in Figure 1(c), the factor of the tensions T2/T1 applied to the mooring tensioner 10 decreases with increasing wrap angle θ of the chain around the chain wheel 40. . This may lead to a reduction in the tension that needs to be applied from the vessel in order to generate the required pre-tension in the mooring line and/or may allow smaller, more readily available and/or cheaper vessels to be used.

The exemplary mooring tensioner 10 shown in Figures 1(b) to 6(b) includes a line engaging device, which may be provided in the form of a chain stopper 50. The chain stopper 50 may be or include one or more features of the chain engaging means disclosed in WO 2015/150770 (by the present applicant), which is hereby incorporated by reference. The chain stopper 50 can be configured to permit movement of the chain 15 a portion thereof in a first direction relative to the mooring tensioner 10, e.g. in a direction towards the chain wheel 45. The chain stopper 50 can be configured to prohibit movement of the chain 15 or a portion thereof in a second direction relative to the mooring tensioner 10, e.g. in a direction towards the rig 20. Th chain stopper 50 may be or act as a one-way ratchet or the like.

The chain stopper 50 is movably connected to the first portion 35. For example, the chain stopper 50 is connected to the first portion 35 so that chain stopper 50 is rotatable or privotable and/or slidable relative to the first portion 35. As can be seen in Figures 4(a) to 4(c), the chain stopper 50 is rotatably or pivotably connected to the first portion 35 at a first attachment region 35a, e.g. by a second elongate member, which may be provided in the form of a second pin or load pin 55a. The chain stopper 50 is slidably connected to the first portion 35 at a second attachment region 35b, e.g. by a third elongate member, which may be provided in form of a third pin or load pin 55b The chain stopper 50 includes a slot 60 provided in the chain stopper 50 through which the third pin extends. It will be appreciated that in other examples the slot may be provided in the first portion of the mooring tensioner additionally to or instead of the slot in the chain stopper.

The chain stopper 50 is connected to the first portion 35 to be moveable between a first position, shown in Figures 3(a) and 4(a), and a second position, shown in Figures 3(b) and 4(b). In the first position of the chain stopper 50, the third pin 55b is located at a first end 60a of the slot 60. In the second position of the chain stopper 50, the third pin 55b is located at a second end 60b of the slot 60. When tension is applied to the second end 15c of the chain 15, e.g. by the pulling and/or tensioning arrangement on the vessel 22, the chain stopper 50 is configured to move from the first position to the second position. In other words, due to the applied tension to the second end 15c of the chain 15, the third pin 55b moves from the first end 60a of the slot 60 towards the second end 60b of the slot 60. Tension may additionally act on the first end 15a of the chain 15 due to its connection to the rig 20.

When the tension is released at the second end 15c of the chain 15, the chain stopper 50 is configured to move or return to the first position. In other words, due to the release of tension at the second end 15c of the chain 15, the third pin 55b moves or returns from the second end 60b of the slot 60 towards the first end 60a of the slot 60.

The mooring tensioner 10 can be configured to be operable, moveable and/or actuatable between a first configuration and a second configuration. In the first configuration of the mooring tensioner 10, the chain stopper 50 is in the first position, as shown in Figures 3(a) and 4(a). In the second configuration of the mooring tensioner 10, the chain stopper 50 is in the second position, as shown in Figures 3(b) and 4(b).

As can be seen in the examples shown in Figures 3(a) and 4(a), in the first configuration of the mooring tensioner 10, the first portion 35 and the second portion 45 are arranged relative to each other such that a longitudinal axis B’ of the first portion 35 is substantially in line, collinear or coaxial with a longitudinal axis B” of the second portion 45. The mooring tensioner 10 can be configured such that in the first configuration of the mooring tensioner, a/the longitudinal axis B of the mooring tensioner 10 is substantially in line, collinear or coaxial with a longitudinal axis C of the second end 15c of the chain 15.

Additionally or alternatively, the mooring tensioner 10 can be configured such that in the first configuration of the mooring tensioner 10, the axis A of the mooring tensioner 10 is be substantially co-planar with the longitudinal axis C of the second end 15a of the chain 15 and/or the axis a of the mooring tensioner 10 extends in a direction substantially perpendicular to the longitudinal axis C of the first end 15a of the chain 15. In the first configuration of the mooring tensioner 10, out of plane strain acting on the mooring tensioner 10 and/or the chain 15 may be reduced.

In the first configuration, the chain stopper 50 or a portion thereof can be configured to engage or be engageable with the chain 15 or portion thereof, e.g. to prevent movement of the chain 15 in the second direction.

Referring to Figures 3(b) and 4(b), in the second configuration of the mooring tensioner 10, the first portion 35 and second portion 45 are arranged relative to each other such that the longitudinal axis of the first portion B’ extends at an angle a, which may be an acute angle, relative to the longitudinal axis B” of the second portion 45. The mooring tensioner 10 may be configured such that in the second configuration, the longitudinal axis B’ of the first portion 35 extends at an angle β, e.g. an acute angle, relative to the longitudinal axis C of the second end 15c of the chain 15, as shown in Figure 4(b). This may reduce out of plane strain acting on the mooring tensioner and/or the chain e.g. in use, e.g. during pull-in and/or tensioning of the chain 15. This may lead to a reduction of losses, e.g. due to friction between the chain under tension and the mooring tensioner, e.g. during pull-in and/or tensioning of the chain.

In the second configuration, the chain stopper 50 means can be configured to partially disengage or be disengageable from the chain 15 or portion thereof, e.g. to prohibit movement of chain 15 or portion thereof in the first direction.

As can be seen in the examples shown in Figures 1(b) to 4(b) the chain wheel 40 is be connected or connectable to the first portion 35 such that the axis A of the mooring tensioner 10 extends in a direction substantially perpendicular to the longitudinal axis B’ of the first portion 35 and the longitudinal axis B’ of the first portion 35 intersect the axis A, e.g. the first pin 47, of the mooring tensioner 10.

Referring to Figures 2(a), 3(a) and 3(b), the second portion 45 can be configured to receive, mount and/or support a mounting element 65, which is connected to the second end 15c of the chain 15. For example, the second portion 45 can mount a mounting element of the chain 15, when tension on the second end 15c of the chain 15 is released. The second end 15c of the chain 15 may become slack, i.e. non-tensioned, as shown in Figure 3(a). The mounting element 65 may permit secure parking or holding of an end of the chain 15 and/or prevent the end of the chain 15 from disengaging from or passing through the mooring tensioner 10. In other words, the mounting element 65 may act as a stopper to prevent the second end of the chain 15c from passing through the mooring tensioner 10. The mounting element 65 may facilitate access to an end of the chain 15 for subsequent tensioning of the chain 15. Additionally or alternatively, the mounting element 65 may negate the use of buoyancy element, which may be difficult to install.

The second portion 45 can configured to align the mounting element 65 and/or the second end 15c of the chain 15 relative to the mooring tensioner 10, e.g. the second portion 45. This may maintain the chain 15 and/or the second end 15c of the chain 15 in alignment relative to the apparatus. The configuration of the mooring tensioner 10, e.g. second portion 45 may prevent misalignment or bending of parts, e.g. one or more link(s), of the chain 15. This may reduce strain acting of, damage and/or wear of the chain 15.

Referring to Figures 2(a), 3(a) and 3(b), the mooring tensioner 10, e.g. the second portion 45 includes a groove or recess 45a and/or a protrusion 45b. In this example the second portion 45 includes a pair of oppositely arranged grooves or recesses 45a and/or a pair of oppositely arranged protrusions 45b. It will be appreciated that in other examples there may be provided less than two or more than two grooves or recesses and/or protrusions. The grooves or recesses 45a and/or protrusions 45b are shaped for mounting and/or supporting the mounting element 65. The grooves or recesses 45a and/or protrusions 45b are arranged and/or shaped to cooperate with a further protrusion 65a of a mounting element 65, e.g. to enable mounting of the mounting element 65 on the mooring tensioner 10, e.g. the second portion 45.

The mounting element 65 is configured to permit connecting of the mounting element 65 and/or the second end 15c of the chain 15 to a yet further line (not shown), which may be in the form of a wire, e.g. a work wire, rope or the like. For example, in use the yet further line is connected to the pulling and/or tensioning arrangement on the vessel. Tension is applied to the yet further line, e.g. using the pulling and/or tensioning arrangement generates tension, e.g. tension T1 in the work wire and T2 in the mooring line, as for example shown in Figure 1(a). For examples, the mounting element 65 may include a connection element 65b, which may be provided in the form of a pad eye or the like.

Referring to Figures 5(a) to 7(b), the mooring tensioner 10 can include a first connector portion 70. In this example the first connector portion 70 is part of the second portion 45 and it moveably connected thereto. The first connector portion 70 can be provided for complementary mating with a corresponding second connector portion 75. The first and second connector portions 70, 75 are part of a subsea or underwater connector, e.g. a subsea or underwater mooring connector. An example of such a connector is disclosed in WO 2013/186553 (by the present applicant), which is hereby incorporated by reference. The second connector portion 75 is configured to be connected or connectable to the further structure 30a located on the seabed 30. The second connector portion 75 may be configured to moveably connected to the further structure 30a, e.g. by a first connection arrangement 80. The first connection arrangement 80 may be provided in the form of a joint or uni-joint arrangement and/or be configured to permit rotational movement of the second connector portion 75, e.g. in at least one direction, relative to the further structure 30a. A first part 80a of the first connection arrangement may be part of the second connector portion 75 and another part 80b of the first connection arrangement may be part of the further structure 30a. The connection arrangement 80 may be configured to be operated or switchable between a first configuration, in which the first part 80a of the connection arrangement 80 is maintained in stationary position, e.g. as shown in Figure 6(a), and a second configuration, in which the first part 80a of the connection arrangement 80 and/or the mooring tensioner 10 or a portion thereof is permitted to move relative to the second part 80b of the connection arrangement 80 and/or the further structure 30a, e.g. as shown in Figure 6(b). The first part 80a of the connection arrangement 80 may be maintained in a stationary position by one or more locking element(s) 90. For example, in use, removal of the one or more locking elements permits movement of the first part 80a of the connection arrangement 80 and/or the mooring tensioner 10 or a portion thereof relative to the second part 80b of the connection arrangement 80 and/or the further structure 30a.

In the examples shown in Figures 5(a) to 6(b), the first connector portion 70 is provided in the form of a male part 70a and the second connector portion 75 is provided in the form of a female part 75a. The female part 75a is configured for receiving the male part 70a. The male part 70a is lowered towards the female part 75a to enable connection of the male part 70a to the female part 75a. During the lowering of the male part 70a into the female part 75a, the male part 70a may be aligned, such as rotationally aligned, relative to the female part 75a. Once the male and female parts 70a, 75a are aligned relative to each other, the male part 70a can be fully inserted into the female part 75a and secured to the female part 75a by a yet further elongate member, which may be provided in the form of a fourth load pin or pin 85.

Referring back to the exemplary system 5 shown in Figures 2(a), 3(a) and 3(b), the second portion 45 can be configured to connect the mooring tensioner 10 to the further mooring line 25, which in turn is connected to the seabed 30 and/or the further structure 30a located thereon. The second portion 45 can be configured to be moveably connected to the further mooring line 25 or a portion thereof. For example, the system 5 can include a second connection arrangement 95 for moveably connecting the mooring tensioner 10, e.g. the second portion 45, to the further mooring line 25.

Figure 8 shows a flow diagram of an exemplary method for mooring a structure. As described above, the structure may be provided as a rig 20. The method can include the step of providing the mooring tensioner 10 and/or the system 5. In step (1010), the mooring tensioner 10 is located at a site or location e.g. a subsea or underwater site or location. Subsequently to locating the mooring tensioner 10, the mooring tensioner 10 is connected to the rig 20, e.g. threading the chain 15 through the mooring tensioner 10 and connecting the first end 15a of the chain 15 to the rig 20.

The method can include the step of connecting or coupling the mooring tensioner 10 to the seabed 30 or a further structure 30a located thereon. This may be done by utilising the further mooring line 25 to connect, e.g. indirectly connect, the mooring tensioner 10 to the seabed 30 or a further structure 30a located thereon. In some examples the mooring tensioner 10 may be connected, e.g. directly connected, the seabed 30 or a further structure 30a located thereon, by utilising the connector or mooring connector, e.g. first and second connector portions 70, 75.

In step 1020 the method includes moving or pulling-in the second end 15c of the chain 15 to adjust tension in the chain 15 and/or length the chain 15 or a portion of the chain 15 extending between the mooring tensioner 10 and the rig 20, e.g. using a pulling or tensioning arrangement, e.g. a winch and/or motor or the like, or an Remotely Operated Vehicle (ROV). As described above, the yet further line may be connected to the second end 15c of the chain 15, e.g. the mounting element 65, and/or tension can be applied to the yet further line, e.g. by the pulling and/or tensioning arrangement on the vessel 22. The step of moving or pulling second end 15c of the chain 15 can include moving, actuating and/or operating the mooring tensioner 10 from first configuration into the second configuration.

It should be understood that the embodiments described herein are merely exemplary and that various modifications may be made thereto without departing from the scope of the invention.

It will be appreciated that in other examples, the line may be or include an offshore mooring line, underwater mooring line or subsea mooring line or the like.

Claims (38)

1. An apparatus for mooring a structure, the apparatus comprising:
a first portion for receiving a portion of a line, such as a mooring line, extending from a structure;
a guide portion for guiding a/the portion of a line received by the first portion, the guide portion being movably connected to the first portion;
a second portion for connecting or coupling the apparatus to a seabed or a further structure located thereon, the second portion being movably connected to the first portion and/or guide portion.
2. The apparatus according to claim 1, wherein the apparatus comprises an axis and the first portion, the second portion and/or the guide portion are arranged to be moveable around or about the axis of the apparatus.
3. The apparatus according to claim 1 or 2, wherein the apparatus comprises a line engaging device, the line engaging device being movably connected or connectable to the first portion.
4. The apparatus according to claim 3, wherein the line engaging device is connected to the first portion to be movable, actuatable and/or operable between a first position and a second position.
5. The apparatus according to claim 4, wherein the line engaging device is configured to be moveable, operable and/or actuatable from the first position to the second position, when tension is applied to at least one end of a line received in or threaded through the apparatus.
6. The apparatus according to claim 4 or 5, wherein the line engaging device is configured to be moveable, operable and/or actuatable from the second position to the first position, when tension is released from at least one end of a line received in or threaded through the apparatus.
7. The apparatus according to any one of claims 4 to 6, wherein the apparatus is operable, moveable or actuatable between a first configuration, in which the line engaging device in the first position and a second configuration, in which the line engaging device is in the second position.
8. The apparatus according to claim 7, wherein in the first configuration of the apparatus, the first and second portions are arranged relative to each other such that a longitudinal axis of the first portion is substantially in line, collinear or coaxial with a longitudinal axis of the second portion.
9. The apparatus according to claim 7 or 8, wherein apparatus is configured or arranged such that in the first configuration a/the longitudinal axis of the apparatus is substantially in line, collinear or coaxial with a longitudinal axis of a portion of a line extending from a structure.
10. The apparatus according to any one of claims 7 to 9, wherein the apparatus is configured or arranged such that in the first configuration the axis is substantially coplanar with a longitudinal axis of a line extending from a structure and/or the axis extends in a direction substantially perpendicular to a longitudinal axis of a line extending from a structure.
11. The apparatus according to any one of claims 4 to 10, wherein in the second configuration of the apparatus, the first and second portions are arranged relative to each other such that a/the longitudinal axis of the first portion extends at an angle relative to a/the longitudinal axis of the second portion.
12. The apparatus according to any preceding claim, wherein the guide portion is connected to the first portion such that the axis extends in a direction substantially perpendicular to a/the longitudinal axis of the first portion and/or that a/the longitudinal axis of the first portion intersects the axis.
13. The apparatus according to any preceding claim, wherein the second portion is configured to receive, mount and/or support a mounting element connected to at least one end of a line.
14. The apparatus according to any preceding claim, wherein the second portion is configured to align a mounting element connected to at least one end of a line received in or threaded through the apparatus and/or at least one end of a line received in or threaded through the apparatus relative to the apparatus.
15. The apparatus according to any preceding claim, wherein the second portion comprises a groove and/or a protrusion, the groove and/or protrusion being shaped for mounting and/or supporting a mounting element connected to at least one end of a line received in or threaded through the apparatus to or on the apparatus.
16. The apparatus according to any preceding claim, wherein the second portion comprises a first connector portion for complementary mating with a corresponding second connector portion.
17. The apparatus according to claim 16, wherein the first connector portion is moveably connected or connectable to the second portion.
18. The apparatus according to any one of claims 1 to 15, wherein the second portion is configured to connect the apparatus to another line or a portion thereof, such as a line extending from a seabed or a further structure located thereon.
19. The apparatus according to claim 18, wherein the second portion is configured to be moveably connected or connectable to another line or a portion thereof, such as a line extending from a seabed or a further structure located thereon.
20. A system for mooring a structure, the system comprising an apparatus for mooring a structure according to any preceding claim.
21. The system according to claim 20, wherein the system comprises a line, such as a chain, wire or rope.
22. The system according to claim 20 or 21, wherein the system comprises a structure, such as a floating structure, offshore structure, floating platform or buoy.
23. The system according to claim 21 or 22, wherein a portion of the line is threaded or threadable through the apparatus, a first end of the line being configured to be connected or connectable to a/the structure.
24. The system according to any one of claims 21 to 23, wherein the line comprises a second end, the second end of the line being configured to be connected or connectable to a mounting element.
25. The system according to claim 24, wherein the mounting element is configured to be mounted or mountable on or to the second portion of the apparatus.
26. The system according to claim 24, wherein the mounting element comprises a further protrusion configured or shaped to cooperate with the groove and/or protrusion of the second portion of the apparatus to enable mounting of the mounting element of the line and/or to enable alignment of the mounting element and/or the second end of the line relative to the second portion of the apparatus.
27. The system according to any one of claims 20 to 26, wherein the system comprises another line, a first end of the other line being configured to be connected or connectable to a seabed or a further structure located thereon and a second end of the other line being connected or connectable to the second portion of the apparatus.
28. The system according to any one of claims 20 to 26, wherein the system comprises a connector, such as a mooring connector or subsea mooring connector, a first connector portion being connected or connectable to the second portion of the apparatus and a second connector portion being configured to be connected or connectable to a seabed or a further structure located thereon.
29 A method for mooring a structure, the method comprising:
locating an apparatus for mooring a structure according to any one of claims 1 to 19 at a site or location, such as a subsea or underwater site or location; and connecting the structure to the apparatus or a portion thereof.
30. The method according to claim 29, wherein the step of connecting comprises connecting a/the first end of the line to the structure and threading a/the second end of a line through the apparatus and.
31. The method according to claim 29 or 30, wherein the method comprises connecting or coupling the apparatus to a seabed or a further structure located thereon.
5
32. The method according to any one of claims 29 to 31, wherein the method comprises moving or pulling the second end of the line or a yet further line connected to the second end of the line to adjust tension in the line and/or length of a portion of the line extending between the apparatus and the structure.
10
33. The method according to claim 32, wherein the step of moving or pulling the second end of the line comprises moving, actuating or operating the apparatus from first configuration into the second configuration.
34. A portion for use in an apparatus for mooring a structure according to any one
15 of claims 1 to 19 and/or a system for mooring a structure according to any one of claims 20 to 28, wherein the portion is configured to receive, support and/or mount a mounting element of a line.
35. A mounting element of a line, the mounting element being configured to be
20 mounted on a portion of an apparatus for mooring a structure according to claim 34.
36. A portion for use in an apparatus for mooring a structure, wherein the portion is configured to receive, support and/or mount a mounting element of a line.
25
37. The portion according to claim 36, wherein the portion comprises a groove or recess and/or a protrusion.
38. The portion according to claim 37, wherein the groove or recess and/or a protrusion are shaped for mounting and/or supporting a mounting element of a line.
Intellectual
Property
Office
Application No: GB1613248.2 Examiner: Alison Illing
GB1613248.2A 2016-08-01 2016-08-01 Mooring tensioner Pending GB2553499A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1613248.2A GB2553499A (en) 2016-08-01 2016-08-01 Mooring tensioner

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
GB1613248.2A GB2553499A (en) 2016-08-01 2016-08-01 Mooring tensioner
GB1617187.8A GB2555085A (en) 2016-08-01 2016-10-10 Mooring method
GB1707671.2A GB2555503A (en) 2016-08-01 2017-05-12 Mooring method
AU2017305635A AU2017305635A1 (en) 2016-08-01 2017-07-28 Mooring tensioner and methods thereof
EP17764430.9A EP3490880A1 (en) 2016-08-01 2017-07-28 Mooring tensioner and methods thereof
US16/319,439 US20190291824A1 (en) 2016-08-01 2017-07-28 Mooring tensioner and methods thereof
PCT/GB2017/052213 WO2018025018A1 (en) 2016-08-01 2017-07-28 Mooring tensioner and methods thereof

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020189522A1 (en) * 2001-06-15 2002-12-19 Dove Peter G. S. Method of and apparatus for offshore mooring
US20050072347A1 (en) * 2003-10-03 2005-04-07 Niebur Alvin J. Fairlead with integrated chain stopper
WO2010085156A1 (en) * 2009-01-23 2010-07-29 I.P. Huse As Device of fairlead, and use thereof
WO2012088511A1 (en) * 2010-12-23 2012-06-28 Bardex Corporation Fairlead latch device
WO2015071318A1 (en) * 2013-11-15 2015-05-21 Dcns Fairlead for guiding an anchoring element

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Publication number Priority date Publication date Assignee Title
US4090462A (en) * 1977-05-10 1978-05-23 Bossert Manufacturing Corporation Dual anchor apparatus and method of using same
GB2096963B (en) * 1981-04-22 1984-09-05 Exxon Production Research Co Off-shore mooring system
NL8105294A (en) * 1981-11-23 1983-06-16 Haak Rob Van Den Method for tensioning an anchor line, in particular for testing an anchor, and an apparatus for implementing the method including, in particular, a cable or chain tensioner.
GB0129239D0 (en) * 2001-12-06 2002-01-23 Wilson Andrew Mooring systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020189522A1 (en) * 2001-06-15 2002-12-19 Dove Peter G. S. Method of and apparatus for offshore mooring
US20050072347A1 (en) * 2003-10-03 2005-04-07 Niebur Alvin J. Fairlead with integrated chain stopper
WO2010085156A1 (en) * 2009-01-23 2010-07-29 I.P. Huse As Device of fairlead, and use thereof
WO2012088511A1 (en) * 2010-12-23 2012-06-28 Bardex Corporation Fairlead latch device
WO2015071318A1 (en) * 2013-11-15 2015-05-21 Dcns Fairlead for guiding an anchoring element
KR20160084396A (en) * 2013-11-15 2016-07-13 데쎄엔에스 Fairlead for guiding an anchoring element

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GB2555085A (en) 2018-04-25
GB201617187D0 (en) 2016-11-23
GB2555085A8 (en) 2018-05-30

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