Clamp apparatus

Abstract

A clamp (10) apparatus for gripping an elongate object, the clamp (10) apparatus comprising: a frame (40) defining a passage (60) therethrough for receiving an elongate object; a clamping assembly (20) mounted on the frame (40) and at least partially circumscribing the passage (60), the clamping assembly (20) comprising a plurality of blades (21) movable between a clamping position in which a radial clamping force is applied to the object when located within the passage (60), and a release position in which a radial clamping force is not applied to the object when located within the passage (60), each of the plurality of blades (21) comprising an actuation surface (22); and, an actuator (30) mounted on the frame (40) and configured to impart a force on the actuation surface (22) of each blade (21) to move the plurality of blades (21) towards the clamping position.

Description

[0001] Clamp Apparatus

[0002] FIELD

[0003] The present disclosure relates to a clamp apparatus, and particularly to a clamp apparatus used to grip elongate objects.

[0004] BACKGROUND

[0005] Many industries involve the deployment or retrieval of elongate objects when assembling or dismantling the infrastructure of a project, or during routine project operations. Some examples may include the deployment or retrieval of pipe / coiled tubing within a wellbore in the oil and gas industry, laying of cables, wiring and / or tubing for communications infrastructure, or laying of pipes for water and gas network projects.

[0006] A further example is the laying of electrical cables subsea as part of creating offshore electrical energy generation plants or farms, such as a windfarm. As part of this process, it is common for electrical cables to be paid out from a floating vessel to the seabed. As it is common for offshore electrical energy generation plants or farms to be disposed many miles offshore, the electrical cables laid must be sufficient in length to cover the distance between the offshore plant or farm and their corresponding onshore distribution plant.

[0007] It may not be practical to cover such distances with a single electrical cable. Therefore, multiple electrical cables may be joined to provide an electrical cable sufficient in length to electrically connect the offshore plant or farm and the onshore distribution plant. Such an operation may involve initially laying a first electrical cable from the vessel to the seabed. A connection end of the first electrical cable may then be recovered to the vessel for connection to a second length of electrical cable, with the remaining portion of the first electrical cable hanging off the vessel towards the seabed. Once this connection has been performed, the second length of electrical cable may also be laid on the seabed. This process may be repeated until an electrical cable is produced which is sufficient in length to extend from the offshore electrical energy generation plant or farm to the onshore distribution plant.

[0008] Given the potential size and weight of a length of electrical cable, the portion of the electrical cable hanging off a vessel during connection operations may impart a strong

[0009] 55742080-1pull on the connection end of an electrical cable away from the vessel. Thus, a strong grip is required at the connection end of the electrical cable to ensure it is safely held on the vessel so connection operations can be safely and reliably performed.

[0010] Excessive or non-uniform grip force on an electrical cable must be avoided though, as this can result in damage to an electrical cable via alteration of the cross-section of the electrical cable, or crushing; with this damage potentially resulting in additional costs for replacement of the section of damaged cable, and / or lost time due to the repair / replacement.

[0011] Additionally, any means of holding a cable on a vessel must also be able to account for potentially varying loads. For example, motion of the water, vessel, or both, may cause the force required to hold the cable securely on the vessel to vary. If such varying loads are not accounted for, the cable may be prematurely released from the vessel.

[0012] SUMMARY

[0013] A first aspect of the present disclosure relates to a clamp apparatus for gripping an elongate object, the clamp apparatus comprising:

[0014] a frame defining a passage therethrough for receiving an elongate object; a clamping assembly mounted on the frame and at least partially circumscribing the passage, the clamping assembly comprising a plurality of blades movable between a clamping position in which a radial clamping force is applied to the object when located within the passage, and a release position in which a radial clamping force is not applied to the object when located within the passage, each of the plurality of blades comprising an actuation surface; and,

[0015] an actuator mounted on the frame and configured to impart a force on the actuation surface of each blade to move the plurality of blades towards the clamping position.

[0016] Increase of the force imparted on the actuation surface of each blade by the actuator may increase the radial clamping force on the elongate object held by the clamp. Alternatively, reduction of the force imparted on the actuation surface by the actuator may reduce the radial clamping force imparted on the elongate object.

[0017] 55742080-1When in the clamping position, contact between each of the blades and the elongate object may also induce friction between the clamping assembly and the object, to ensure the object is securely held by the clamp. Increase of the force imparted on the actuation surface of each blade by the actuator may therefore increase the radial clamping force imparted on the object by the clamping assembly, which in turn may increase the friction between the clamping assembly and the object. Therefore, the force imparted by the actuator may be increased to increase the friction between the clamp and the elongate object, and improve how securely the elongate object is held by the clamp. Alternatively, the force imparted by the actuator on the actuation surface of each blade may be decreased to decrease the radial clamping force of the clamping assembly on the elongate object, thus reducing the friction between the clamp and the object; which may allow the object to be released from the clamp.

[0018] The use of a plurality of blades may provide an increased contact area between the clamping assembly and the elongate object to be held by the clamp; thus increasing the friction between the clamp and the elongate object. Increased friction between the clamp and the object being gripped may improve the grip of the clamp on the object, without the need to increase the radial clamping force between clamping assembly and the object. This may help to prevent damage to the elongate object being gripped by the clamp caused by high clamping forces acting on the object damage (e.g. from changes in cross-sectional shape of the elongate object, or crushing of the object).

[0019] The increased contact area between the clamp and the elongate object (and therefore the increased frictional force between the clamp and the cable) may also help in reduction of an overall length of the clamp, as the contact area between the clamp and an elongate object being gripped by the clamp is increased by the use of additional blades, and not by an increase in the length of the blades. This may further help to reduce the overall footprint of the clamp apparatus.

[0020] The passage may be defined by the plurality of blades of the clamping assembly. The plurality of blades may be uniformly distributed to form the passage. The use of a uniformly distributed plurality of blades to form the passage may provide a uniform gripping force around the elongate object when held by the clamp. This may also help to maintain the cross-sectional shape of the object, and may also mitigate against damage to the object which may be caused by a change in the cross-sectional shape of the object.

[0021] 55742080-1However, in some examples at least some of the blades may be non-uniformly distributed.

[0022] The clamp assembly may comprise any suitable number of blades. The number of blades that may be used with the clamp may be defined by spatial limitations of the frame. The number of blades may be defined in accordance with the clamping force required from the clamp in use. The clamp assembly may comprise between 2 and 30 blades. In some examples, the clamp assembly may comprise between 5 and 15 blades. In another example, the clamp assembly may comprise at least 8 blades.

[0023] The elongate object may be a cylindrical elongate object. The cylindrical elongate object may be an electrical power cable. The cylindrical object may be a conduit such as a pipe or pipeline, umbilical, riser, or the like. The cylindrical elongate object may be an object for use in subterranean wellbore applications, such as production tubing, coiled tubing or wellbore casing.

[0024] In one example, the clamp may be used for gripping an electrical cable during subsea cable lay operations. A first length of electrical cable may have been laid on the seabed and terminated at a connection end. The connection end of the cable may then be recovered to a vessel for connection to a second length of electrical cable. A portion of the first length of cable adjacent the connection end may be fed into or otherwise disposed in the clamp of the present disclosure. Actuation of the actuator of the clamp may then result in the blades of the clamping assembly imparting a radial clamping force on the cable to hold the cable in place. The actuation force may be increased to ensure the cable is securely held by the clamp. The connection end of the first length of electrical cable may then be connected to a connection end of a second length of electrical cable. Once the connection is complete, and the second length of electrical cable is ready to be laid, the actuation force of the clamp can be decreased to release to the cable from clamp. It will be appreciated that similar principles may be applied to examples where connections are made between sections of conduit, such as conduits listed in the examples above.

[0025] The frame may comprise a first end and a second end. The passage may extend between the first and second ends of the frame.

[0026] 55742080-1The actuator may be a linear actuator acting linearly between the first and second ends of the frame of the clamp. The actuator may act linearly in directions substantially parallel to the passage of the clamp. Therefore, actuation surface of each blade may be configured to transform the linear force of the actuator to the radial clamping force applied to the object located within the passage.

[0027] In use, the linear actuator may act towards the first end of the frame to move each of the plurality of blades into the clamping position and apply a radial clamping force to the object. Conversely, the linear actuator may act towards the second end of the frame to reduce the clamping force on the object to move the blades towards the release position.

[0028] In another example, the actuator may be a linear actuator acting substantially perpendicularly to the actuation surface of each blade, with extension of the linear actuator moving each of the blades into the clamping position to apply a radial clamping force to the object; or retraction of the linear actuator reducing the clamping force on the object to move the blades towards the release position.

[0029] The linear actuator may comprise any suitable linear actuator within the knowledge of the skilled person. For example, the linear actuator may comprise one or more hydraulic rams, electric linear actuators, mechanical jacks, and / or the like.

[0030] The actuator may be a rotary actuator. The rotary actuator may comprise one or more rotors comprising a rotating cam. The rotating cam may comprise a circumferential profile which is used to engage the actuation surface of each blade to impart a force on the actuation surface of each blade to move the plurality of blades towards the clamping position. The circumferential profile of each cam may be varied dependent on the required clamping force required from the clamp.

[0031] The actuator mechanically connected to each of the plurality of blades. The actuator may be configured to mechanically connect and disconnect from each of the plurality of blades. For example, the actuator may be configured to mechanically connect to each of the plurality of blades when it is moved to impart a force on the actuation surface of each blade to move the plurality of blades towards the clamping position. Conversely, the actuator may be mechanically disconnected from each of the plurality of blades when all force imparted on each of the plurality of blades by the actuator is removed. The

[0032] 55742080-1actuator may be configured to mechanically connect to each of the plurality of blades when it engages the actuation surface of each blade. The actuator may therefore also be configured to mechanically disconnect from each of the plurality of blades when it disengages the actuation surface of each of the plurality of blades.

[0033] The mechanical connection between the actuator and the plurality of blades may be configured to manage the radial movement of each of the plurality of blades, and thus manage the radial clamping force applied by the clamp on the elongate object. For example, the mechanical connection may be configured to move each of the plurality of blades towards the clamping position when the actuator is moved towards the first end of the frame of the clamp, and to move each of the plurality of blades away from the clamping position when it is moved towards the second end of the clamp.

[0034] The mechanical connection may allow for sliding engagement between the actuator and each of the plurality of blades. In one example, the actuator may comprise a track for each of the plurality of blades. Each blade may comprise a corresponding profile to be received with its respective track, forming the mechanical connection between the actuator and the blades. The track may comprise a t-shaped slot, with each blade comprising a t-shaped profile to be received within the t-shaped slot of its respective track.

[0035] The actuator may comprise a load collar. The load collar may be substantially co-axial with, and circumscribe, the passage of the clamp. The load collar may circumscribe the plurality of blades. The load collar may be configured to engage the actuation surface of each blade and impart a force on the actuation surface of the blade.

[0036] In use, when the load collar has engaged the actuation surface of each blade, the force imparted on the actuation surface by the load collar may be increased by further travel of the load collar towards the first end of the frame. Alternatively, the force imparted on the actuation surface of each blade may be reduced by moving the load collar towards the second end of the frame.

[0037] The frame may further comprise at least one load collar guide. The at least one load collar guide may extend between the first and second ends of the frame. The at least one load collar guide may be substantially parallel to the passage of the frame of the

[0038] 55742080-1clamp. The at least one load collar guide may be configured to constrain the load collar to linear movement between the first and second ends of the frame.

[0039] The actuation surface of each blade may comprise an inclined surface. The inclined surface may extend away from the passage of the frame of the clamp. The inclined surface may define an acute angle with respect to the passage (i.e. an angle of between 0° and 90° may be defined between the inclined surface and the passage). In a preferred embodiment, the inclined surface may define an angle of between 5° and 10° with the passage. In use the actuator may impart a force on the inclined surface of the actuation surface of each blade.

[0040] The angle of inclination of the inclined surface of each actuation surface of each blade may be substantially the same. Therefore, if the actuator acts upon each actuation surface simultaneously, each blade will provide a substantially similar, or even identical, radial clamping force on the elongate object held by the clamp. This may provide a consistent clamping or gripping force around the circumference of the object being held by the clamp.

[0041] In one embodiment, the clamp may comprise both a linear actuator and an actuation surface comprising an inclined surface. When the linear actuator acts towards the first end of the frame of the clamp, it may impart a substantially linear force on the inclined surface of the actuation surface of each blade. The inclined surface of the actuation surface may then translate the substantially linear force applied by the actuator into separate radial and linear force vectors, wherein the radial force vector acts towards the passage of the clamp. Said radial force is then translated to each blade via its actuation surface; thus bringing the bringing the clamping assembly into a clamping position and applying a radial clamping force to the object located within the passage.

[0042] As will be appreciated by the skilled reader, the radial force vector may be changed by altering the angle of inclination of the inclined surface of the actuation surface.

[0043] At least one blade of the plurality of blades may comprise a removable insert. In use, the removable insert may define a portion of the blade closest to the passage of the clamp. Therefore, in use, the removable insert may define the portion of each blade that contacts

[0044] 55742080-1the object being held by the clamp. The removable insert may be removably connected to each blade via any suitable means, such as any suitable fastener.

[0045] The removable insert may comprise a contact pad, wherein contact pad may define the portion of the blade that contacts the elongate object held by the clamp. The contact pad may be formed of any suitable polymer. For example, the contact pad may be formed of a rubber, such as a fibre filled rubber. The contact pad may be formed of a material with a high coefficient of friction. This may help to increase the friction between the clamp and the object held by the clamp, thus improving the security and stability of the clamp’s grip on the object.

[0046] The contact pad may be formed of a deformable material. Therefore, the contact pad may deform when the clamp is in gripping engagement with an object. Deformation of the contact pad may increase the contact area between the object being gripped and the clamping assembly of the clamp, thus increasing the friction between the clamp and the object being gripped. Increased contact area between the contact pad and the object being gripped by the clamp may also reduce the pressure applied to the object being gripped by clamping assembly of the clamp, helping to reduce damage to the object being gripped.

[0047] The frame may be configurable between an open configuration and a closed configuration. When in the open configuration, an elongate object may be positioned laterally within the passage. Thus, the clamp may not be restricted to positioning an object laterally within the passage via feeding the object into the passage at one of the first and second ends of the frame.

[0048] The frame may comprise a lock, configurable between a locked configuration to maintain the clamp in a closed configuration, and an unlocked configuration to allow the clamp to be reconfigured to an open configuration. The lock may comprise a removable fastener, bolt, pin, or any other locking means within the understanding of the skilled reader.

[0049] The frame may comprise a hinge. The frame may pivot about the hinge to configure the clamp between the open and closed configuration. In use, the hinge may configure the frame in a ‘clamshell’ configuration for movement between the open and closed configurations.

[0050] 55742080-1Use of a hinge for configuring the frame between the open and closed configurations may be beneficial for alignment of the frame when reconfiguring the clamp from an open configuration to a closed configuration. For example, when the frame is to be moved from the open configuration to the closed configuration following the insertion of an object to be gripped into the clamp, the hinge may ensure that the frame is aligned for correct functioning of the clamp, before the object is gripped by the clamp.

[0051] The plurality of blades may be movable towards at least one of the first and second ends of the frame. In use, the plurality of blades may be movable towards one of the first and second ends when the actuator imparts a force on the actuation surface of each blade, prior to the plurality of blades moving towards the clamping position. In other words, the actuator of the clamp imparting a force on the actuation surface of the blades may result in lost motion (i.e. via the plurality of blades moving towards one of the first or second ends) prior to the plurality of blades moving towards the clamping position.

[0052] Movement of the plurality of blades of the clamp towards the first end may be advantageous when the clamp is in gripping engagement with an elongate object. For example, when an elongate object is being held by the clamp, friction may be induced between the plurality of blades of the clamping assembly and the elongate object. When the elongate object is pulled towards the first end of the clamp, a drag force may be imparted on the plurality of blades, pulling them towards one of the first end of the clamp. Such movement of the blades towards the first end of the clamp may then reduce the radial clamping force between the actuator and the actuation surface of each blade. Therefore, the radial clamping force between the clamp assembly and the object being held by the clamp may be reduced. Conversely, when a pulling force is imparted on the elongate object towards the second end of the clamp, the plurality of blades may also be pulled towards the second end of the frame via a drag force imparted on them by the cable. Such movement of the blades towards the second end of the frame may therefore increase the force between the actuator and the actuation surface of each blade. Therefore, the radial clamping force between the clamp assembly and the object being held by the clamp may be increased.

[0053] Therefore, such movement of the blades may be beneficial to help maintain sufficient gripping force on an object being held by the clamp when variable loads may be applied

[0054] 55742080-1to the elongate object. For example, if the clamp is disposed on the deck of a vessel, with the clamp being used to hold a section of subsea power cable, variable loads may be applied to the cable by the motion of the water, motion of the vessel, or both. When an increased load is applied to the cable (e.g. by falling water levels reducing the buoyancy force on the cable), the blades may move towards the second end of the clamp to increase the radial clamping force between the clamping assembly and the cable, ensuring a sufficient grip is maintained to securely hold the cable. On the other hand, when the load of the cable is reduced (e.g. by rising water levels increasing the buoyancy force on the cable), the blades may move towards the first end of the frame, reducing the radial clamping force between the clamping assembly and the cable.

[0055] Thus, movement of the blades may allow the clamp to account for varying external forces being applied to the elongate object, ensuring a secure and stable gripping force is provided by the clamp at all times. Movement of the blades may also provide the clamp with a ‘fail-safe’ mode in the event the actuator becomes locked or stuck while the clamp is gripping an elongate object subject to variable axial forces.

[0056] The frame may comprise a mechanical stop arrangement configured to limit travel distance of the blades towards at least one of the first and second ends of the frame. For example, the mechanical stop arrangement may limit the travel distance of the blades towards the first end to ensure the blades does not travel sufficiently far to remove all contact force between the clamping assembly and the object held by the clamp; which may remove the object from the grip of the clamp.

[0057] The stop arrangement may comprise a resilient member configured to bias the movement of the blades towards one of the first and second ends of the frame when the blades are engaged with the mechanical stop arrangement. In use, the stop arrangement may be configured such that the resilient member provides a preload, limiting or resisting movement of the blades towards the first end of the frame, and ensuring the blades remain in contact with the actuator when the actuator is imparting a force on the actuation surface of each blade. The preload may also assist the blades to begin to move radially towards the clamping position when the actuator is imparting a force on the actuation surface of each blade.

[0058] 55742080-1Further, when an elongate object is held by the clamp, the resilient member therefore also biases the blades towards the second end of the frame, biasing the actuation surface of each blade towards the actuator. Thus, if the elongate object imparts a drag force on the blades towards the first end of the frame, the resilient member may ensure the blades may remain in contact with the actuator until the drag force is removed. The resilient member may comprise any suitable resilient member within the understanding of the skilled person, such as a spring or resilient material.

[0059] A second aspect of the present disclosure relates to a clamp apparatus for gripping an elongate object, the clamp apparatus comprising:

[0060] a frame defining a passage therethrough for receiving an elongate object; a clamping assembly mounted on the frame and at least partially circumscribing the passage, the clamping assembly comprising at least one of blade movable between a clamping position in which a radial clamping force is applied to the object when located within the passage, and a release position in which a radial clamping force is not applied to the object when located within the passage, the at least one blade comprising an actuation surface; and,

[0061] an actuator mounted on the frame and configured to impart a force on the actuation surface of each blade to move the blade towards the clamping position.

[0062] A third aspect of the invention relates to a system for installing an elongate object, the system comprising:

[0063] a first elongate object;

[0064] a tensioner configured, in use, to control the tension of the elongate object as it is installed; and,

[0065] a clamp according to any of the foregoing aspects of the present disclosure; wherein, in use, the clamp selectively clamps a second elongate object to permit connection of the first elongate object to the second, prior to the first elongate object being installed.

[0066] The system may comprise installing the elongate object. For example, the system may comprise installing an elongate object on a seabed, or within a wellbore formed within a subterranean reservoir. The system may comprise installing the elongate object from a floating vessel, such as a boat / ship. At least one of the tensioner and the clamp may be

[0067] 55742080-1disposed a deck of the vessel. The elongate object may be disposed on the deck of the vessel prior to installation.

[0068] The system may further comprise a reel upon which the elongate object is disposed. The elongate object may therefore be at least partially reeled around the reel prior to installation.

[0069] At least one of the first and second elongate objects may comprise a cylindrical elongate object, such as a pipe, section of wellbore casing or a length of coiled tubing. At least one of the first and second elongate objects may comprise an electric cable.

[0070] A fourth aspect of the present disclosure relates to a method of clamping an elongate object. The method comprises:

[0071] providing a clamp apparatus comprising:

[0072] a frame defining a passage therethrough for receiving an elongate object; a clamping assembly mounted on the frame and at least partially circumscribing the passage, the clamping assembly comprising a plurality of blades moveable between a clamping position in which a radial clamping force is applied to the object when located within the passage, and a release position in which a radial clamping force is not applied to the object when located within the passage, the plurality of blades each comprising an actuation surface; and,

[0073] an actuator mounted on the frame and configured to impart a force on the actuation surface of the at least one blade to move the at least one blade towards the clamping position;

[0074] inserting an elongate object into passage the clamp; and,

[0075] imparting a force on the actuation surface of each of the plurality of blades, wherein said force is transferred to the blades via the actuation surface to move the clamping assembly into a clamping position and impart a radial clamping force to the elongate object.

[0076] The method may further comprise increasing the force imparted on the actuation surface by the actuator to increase the radial clamping force between the clamping assembly and the elongate object.

[0077] 55742080-1The method may further comprise reducing or removing the force imparted on the actuation surface by actuator to reduce or remove the radial clamping force between the clamping assembly and the elongate object. This may allow for the elongate object to be released from the clamp.

[0078] The frame may comprise a first end and a second end. The actuator may be a linear actuator, movable linearly between the first and second ends of the frame. The actuation surface may comprise an inclined surface inclined away from the passage of the frame. Therefore, the method may further comprise transforming, via the actuation surface, the linear force of the actuator to a radial force to move the blades towards the clamping position and apply a radial clamping force to the elongate object.

[0079] The plurality of blades may be substantially uniform with one and other. The use of a plurality of blades may provide an increased area of contact between the clamp assembly and the elongate object. The increased area of contact between the clamp and the elongate object may increase the friction between the clamp and the object, thereby improving the grip that the clamp may have on the object. Increased friction caused by the increased area of contact may result in a lower radial clamping force being required between the clamping assembly and the object to ensure the object is securely gripped by the clamp. This may help to reduce damage to the elongate object caused by high radial clamping forces imparted by the clamp, which could potentially alter the cross-sectional shape of the elongate object, or crush the elongate object.

[0080] It will be appreciated that any feature described in connection with an aspect of the present disclosure may be used in combination with other aspects of the present disclosure.

[0081] BRIEF DESCRIPTION OF THE FIGURES

[0082] Provided below is a brief description of the figures of the present disclosure, wherein;

[0083] Figure 1 A provides a side view of the clamp of the present disclosure;

[0084] Figure 1B provides a plan view of the clamp of Figure 1A;

[0085] 55742080-1Figures 1C and 1D provide a sectional view of the clamp of Figures 1A and 1B, demonstrating details of the actuator of the clamp;

[0086] Figure 1E provides a detailed view of Section A of Figure 1A;

[0087] Figures 1F and 1G provide an end view of a first end of the clamp of Figures 1A and 1B;

[0088] Figure 1 H provides an isometric view of an example removable insert of the clamp of the present invention;

[0089] Figure 11 provides an end view of the second end of the clamp of Figures 1A and 1B;

[0090] Figure 2 provides a side view of the clamp of the present disclosure, wherein the clamp is in gripping engagement with an electric cable disposed therethrough;

[0091] Figure 3A provides an isometric view of the clamp of the present disclosure, wherein the clamp is in gripping engagement with an electric cable disposed therethrough;

[0092] Figure 3B provides an isometric view of the clamp of the present disclosure, wherein the clamp is configured to release an electric cable disposed therethrough;

[0093] Figure 4A provides an isometric view of an embodiment of the clamp of the present disclosure in an open configuration;

[0094] Figure 4B provides an end view of the clamp of Figure 4A, with the clamp in the open configuration;

[0095] Figures 5A and 5B provide a detailed view of a portion of the lock arrangement of the clamp shown in each of the foregoing examples;

[0096] Figures 6A and 6B provide a schematic of a system including the clamp of the present disclosure, wherein the system demonstrates the use of the clamp in laying electrical cables subsea.

[0097] 55742080-1DETAILED DESCRIPTION

[0098] Figures 1A and 1 B provide a side view and a plan view respectively of a clamp 10 of the present disclosure, wherein the clamp is being used to hold / grip an elongate object 100 (which in this example is an electric cable).

[0099] The clamp 10 comprises a frame 40, which in this example comprises a base 43, a first end plate 46, and a second end plate 47. The frame defines a passage 60 therethrough, as indicated by the dashed line, for receipt of the electrical / dynamic cable 100.

[0100] The clamp 10 further comprises a clamping assembly 20 mounted on the frame 40. The clamping assembly 20 comprises a plurality of blades 20 extending between the first end 46 and the second end 47. In this example, the blades extend substantially parallel to passage 60 of the clamp 10. Each of the blades 21 extends radially from the passage axis 60, such that the clamping assembly circumscribes the passage 60, and is radially movable between a clamping position, wherein the clamping assembly 20 is engaged with the electric cable 100, and a release position. Each of the blades 21 are uniform in structure with one and other. Each of the blades 21 are evenly distributed around the passage 60 of the clamp 10. In this example, the clamp 10 comprises sixteen blades 21, but the skilled reader will appreciate that this number may be varied. For example, other embodiments may comprise 2 to 10 blades. In other examples, the number of blades used may be greater than 16.

[0101] Each of the blades 21 comprises an actuation surface 22. In the example of Figures 1A and 1B, each actuation surface 22 comprises an inclined surface. The inclined surface forms an acute angle with the passage 60 of the clamp 10. In one embodiment, the angle of inclination of the inclined surface may be between 5° and 10°. In this example, the angle of inclination of the inclined surface of each actuation surface is substantially the same.

[0102] The clamping assembly 20 further comprises an actuator 30 configured to impart a force upon the actuation surface 22 of each blade 21. In the example of Figures 1A and 1B, the actuator comprises a load collar 33 circumscribing the passage 60 of the clamp 10. The load collar 33 is linearly movable between the first and second ends 46, 47 of the clamp 10. In this example, the load collar 33 is moveable in directions substantially

[0103] 55742080-1parallel to the passage 60 of the clamp 10. The load collar 33 is movable towards the first end 46 to engage the with actuation surface 22 of each blade 21. When the load collar 33 engages the actuation surface 22 of each blade 21, a force is imparted from the load collar 33 to each actuation surface 22, which in turn is transferred to each blade 21. This causes the blades to move radially towards the passage 60 of the clamp 10, and impart a radial clamping force on the electric cable 100.

[0104] In the present example, the load collar 33 is mechanically connected to the each of the plurality of blades 21. This is achieved by the load collar 33 comprising a plurality of blade guides 35 extending from its inner surface 33a, as best shown in Figure 1 C, with each blade guide 35 accommodating a corresponding blade 21 of the clamp 10.

[0105] As can also be seen from Figure 1C (and in larger detail, Figure 1 D), each blade guide 35 comprises a ‘t-shaped’ slot 38 matched to a ‘t-shaped’ profile 25 at the end of each blade 21. In use, the ‘t-shaped’ slot 38 of each blade guide 35 is used as a track for a corresponding ‘t-shaped’ shaped profile 25 of each blade 21, with this track being used to manage the motion of the blades 21 into towards and away from the passage 60 of the clamp 10, bringing the plurality of blades 21 into engagement with the cable 100 when the load collar 33 is moved towards the first end 46 of the clamp 10; and to lift the blades 21 out of engagement with the cable 100 when the cable 100 is to be released, when the load collar 33 moved towards the second end 47. Although the specific example of a ‘t-shaped’ slot 38 of the blade guide 35 and a corresponding ‘t-shaped’ profile 25 of a corresponding blade 21 have been used here, the skilled reader will appreciate that other configurations may be possible to achieve this mechanical connection between the load collar 33 and each of the plurality of blades 21.

[0106] As can also be seen from this example, sufficient retraction of the load collar 33 will allow the ‘t-shaped’ profile 25 of each blade 21 to be removed from its corresponding slot 38, thereby mechanically disconnecting the load collar 33 from each of the plurality of blades 21. The skilled reader will appreciate that this may not always be the case though, and the blades 21 may be configured such that they remain in mechanical connection with the load collar 33 at all times.

[0107] In this example, the guides 35 further comprise wear resistant inserts 35a, disposed between each blade 21 and its respective load collar guide 35. These inserts 35a may

[0108] 55742080-1be used to prevent wear (which may otherwise arise from metal to metal contact) between the blades 21 and the load collar 33 when the load collar 33 is moved in and out of engagement with the blades 21. These inserts 35a may be low friction inserts, allowing for load collar 33 to move along the blades 21 without being resisted by friction between the load collar 33 and the blades 21. The inserts 35a may be formed of any suitable material, such as any suitable polymer. Examples of suitable polymers may be polytetrafluoroethylene (PTFE), nylon or polyetheretherketone (PEEK).

[0109] It will be appreciated that in other embodiments the load collar 33 may not comprise such guides 35, and the load collar 33 may comprise a simplified collar structure, wherein, for example, an inner circumference of the load collar 33 acts directly on the blades 21 of the clamp 10.

[0110] As outlined above, radial movement of the blades 21 of the clamping assembly 20 towards the electric cable 100 will bring the blades 21 into contact with the cable 100, with a radial clamping force ultimately being imparted on the cable 100, gripping the cable 100. Further travel of the load collar 33 towards the first end 46 will increase the radial clamping force between the clamping assembly and the cable 100, as the force imparted on the actuation surface 22 of each blade 21 by the load collar 33 is increased. Conversely, movement of the load collar 33 towards the second end 47 will result in a decreased radial clamping force between the clamping assembly 20 and the cable 100, as the force imparted on the actuation surface 22 of the blades 21 by the load collar 30 is reduced.

[0111] Given that in this example the load collar 33 may only move linearly between the first and second end 46, 47, and substantially parallel to the central axis 60 of the clamp 10, the inclined surface of the actuation surface 22 of each blade 20 transforms the linear force provided by the load collar 33 to a radial movement of the blades 21 towards the electric cable 100, and thus a radial clamping force being imparted by the clamping assembly 20 on the cable 100.

[0112] As also shown in Figures 1 A and 1 B, the clamp 10 further comprises a pair of guides 42 extending between the first and second ends 46, 47 of the clamp 10. In this example the guides 42 also extend substantially parallel to the passage 60 of the clamp 10. The load collar 33 is connected to the guides 42, such that the guides 42 constrain the load collar

[0113] 55742080-133 to linear travel between the first and second ends 46, 47 only. In the example of Figures 1 A and 1 B, the load collar 33 further comprises a pair of bearings 32 to connect the load collar 33 to the guides 42. Therefore, the bearings 32 allow the load collar 33 to travel along the path defined by the guides 42.

[0114] The actuator 30 further comprises a pair of load cylinders 34 (for example hydraulic cylinders / rams) connected to the load collar 33. The load cylinders 34 are used to move the load collar 33 between the first and second ends 46, 47. For example, the load cylinders 34 may be extended to move the load collar 33 towards the first end 46 to engage the actuation surface 22 of each blade 20, and retracted to move the load collar 33 towards the second end 47, to disengage the actuation surface 22 of each blade 21. When the load collar 33 has engaged the actuation surface 22 of each blade 21 , thereby imparting a force on each actuation surface 22 such that a radial clamping force is provided, the load provided by the load cylinders 34 on the load collar 33 may be increased to increase the radial clamping force. In other words, the load provided by the load cylinders 34 may be increased to increase the gripping force of the clamp 10 on the cable 100, or reduced to reduce the gripping force of the clamp on the cable 100.

[0115] Although the load cylinders 34 of the present example are shown as hydraulic rams, the skilled reader will appreciate that these may be replaced with any other suitable means of moving the load collar 33 linearly, such as one or more electric linear actuators or mechanical jacks.

[0116] As will be explained in greater detail below in relation to Figures 4A and 4B, the frame 40 may be configured between open and closed configurations (shown in Figures 4A and 4B). In the example of Figures 1A and 1B, the clamp 10 comprises a lock arrangement 50, configured to selectively maintain the frame 40 in the closed configuration. In the example of Figures 1A and 1B, the lock arrangement 50 comprises removable bolts 50a, 50b, 50c, 50d. Therefore, removal of bolts 50a, 50b, 50c, 50d from the clamp 10 allows the clamp 10 to be reconfigured to the open configuration, allowing a cable 100 to be inserted or removed. When the clamp 10 is closed in the locked configured, the bolts 50a, 50b, 50c, 50d are reinserted.

[0117] The frame 40 further comprises a pair of hinges 44a, 44b, providing a point for the frame 40 to pivot about when being configured between the open and closed configurations.

[0118] 55742080-1As will be explained in greater detail below (in relation to Figures 4A and 4B), the hinges 44a, 44b configure the clamp 10 in a ‘clamshell’ configuration, wherein an opening for insertion or removal of the electrical / dynamic cable 100 is defined opposite the hinges 44a, 44b / pivot point of the frame 40, when configuring the frame 40 between the open and closed configurations. Therefore, when the clamp 10 is opened or closed, and the frame pivots about the hinges 44a, 44b, the hinges 44a, 44b constrain the frame 40 in a single plane of motion. Constraining the frame 40 in a single plane of motion may be beneficial for alignment of the frame when it is reconfigured to the closed configuration, prior to being used to clamp the electric / dynamic cable 100, ensuring correct functioning of the clamp 10 in its closed configuration.

[0119] The clamp 10 further comprises a pair of base cylinders 48 connected between the base 43 of the frame 40 and the second end plate 47. Again, as will be explained in greater detail in relation to Figures 4A and 4B, the base cylinders 48 may assist with opening and closing the frame 40 when in an unlocked configuration. In the present example, the base cylinders 48 are hydraulic cylinders / rams. Thus, when the frame 40 is unlocked, the hydraulic cylinders 48 may be extended or retracted to control the opening and closing of the frame 40.

[0120] In some examples, the base 43 of the frame may further comprise a means of connecting / fastening the clamp 10 to the area upon which the clamp 10 is disposed (for example, the deck of a vessel). In the example wherein the clamp 10 is used to grip an electric cable on a vessel, connection of the clamp 10 to the deck of the vessel may be beneficial to ensure the clamp 10 does not move due to movements of the vessel induced by motion of the water.

[0121] The blades 21 of the clamp 10 may also be movable between the first and second ends 46, 47 of the frame 40 of the clamp 10. Therefore, movement of the blades 21 towards the first end 46 of the frame 40 of the clamp 10 may extend a portion of the blades 21 beyond the first end plate 46.

[0122] As indicated by section A of Figure 1A, the frame 40 further comprises a lost motion arrangement 90 to provide lost motion of the blades 21 when the load collar 33 engages the actuation surface 22 of each blade 21. The lost motion arrangement 90 may be used to permit a degree of linear movement of the blades 21 towards the first end 46 of the

[0123] 55742080-1frame 40 when the actuation surface 22 of each blade 21 is engaged by the load collar 33, prior to the blades 21 moving radially towards the clamping position.

[0124] Figure 1F provides an enlarged view of the lost motion arrangement 90. The lost motion arrangement comprises a lost motion plate 92 connected to the second end plate 47. The lost motion plate 92 comprises a plurality of slots (not shown) receiving each of the blades 21 of the clamping assembly 20, such that each blade 21 extends through the lost motion plate 92. Each blade 21 further comprises an end stop 94 configured to prevent each blade 20 from leaving its respective slot when the blades 20 move towards the first end 46 (indicated by the arrow towards the first end 46 in Figure 1 F) of the frame 40 of the clamp 10.

[0125] In use, when the load collar 33 engages the actuation surface 22 of each blade 21, the blades will be urged linearly towards the first end 46 of the frame 40. Sufficient linear movement of the If the blades 21 towards the first end 46 will cause the end stop 94 of each blade 21 will engage the lost motion plate 92. Once engaged, further movement of the blades 21 towards the first end 46 of the frame 40 will cause the lost motion plate 92 to compress the spring 96 of the lost motion arrangement, which will resist further motion of the blades 21 towards the first end 46 of the frame 40.

[0126] Resistance of the movement of the blades 21 towards the first end 46 will then allow the load collar 33 to further engage the actuation surface 22 of each blade 21, thereby resulting in radial movement of the blades 21 towards the electric cable 100, bringing the clamping assembly 20 into gripping engagement with the electric cable 100.

[0127] As outlined above, the spring 96 may be configured to provide a preload, configured limit the distance the blades 21 may travel towards the first end 46 of the frame 40 when engaged by the load collar 33, and urging the actuation surface 22 of each blade 21 into engagement with the load collar 33; thereby inducing radial motion of the blades 21 toward the passage 60 of the clamp and into engagement with the elongate object 100.

[0128] When the load collar 33 is retracted (i.e. moved towards the second end 47 of the frame 40), the blades 21 will begin to move radially away from cable 100. The spring 96 of the lost motion arrangement 90 biases the lost motion plate 92 towards the second end 47 of the frame 40, pulling the blades 21 (via the end stop 94 of each blade 21) towards the

[0129] 55742080-1second end 47. A pulling force may be exerted on the blades 21 until the spring 96 returns to an equilibrium position. Although in this example a spring is used with the lost motion arrangement 90, the skilled reader will appreciate that any suitable resilient means or material may be used.

[0130] Figures 1C and 1D provide an end view of the first end 46 of the clamp 10 of Figures 1A and 1B. Figures 1C and 1D show the clamp 10 in gripping engagement with electric cables 100a, 100b of different diameters.

[0131] Each of the blades 21 of the clamping assembly 20 engaging the cables 100a, 100b comprises a removable insert 24, formed of a removable insert body 28 and a contact pad 26 (as shown in Figure 1E). In use, the removable insert forms the portion of each blade 21 closest to the passage 60, and thus the portion of the clamping assembly 20 that contacts the cable 100a, 100b held / gripped by the clamp 10. The removable insert 24 may be attached to a blade 21 by any suitable means, such as a removable fastener. This may allow replacement of the removable insert 24 if it becomes worn or damaged. This may also allow the removable insert 24 to be changed to a removable insert 24 with a different configuration (e.g. a removable insert 24 with a contact pad formed of a different material, or with a different coefficient of friction).

[0132] The first end plate 46 further comprises a plurality of slots 45 extending radially from an opening 41 defined within the first end plate 46, with each slot aligned with, and configured to receive a blade 21 of the clamping assembly 20. Therefore, movement of the blades 21 towards the first end 46 of the frame 40 may extend a portion of each blade 21 beyond the first end plate 46. The slots may also be beneficial to constrain the motion of the blades 21 only on a radial path of travel to and from the passage 60, and in linear directions between first and second ends 46, 47.

[0133] To prevent wear between the blades 21 and the first end plate 46 during such movement, each slot 45 within the first end plate 46 comprises at least one wear resistant insert 45a. These inserts 45a prevent potential metal to metal contact between the blades 21 and the first end plate 46, which may ultimately damage the blades 21 and / or first end plate 46 caused by linear or radial movement of the blades 21 within the first end plate 46. Said inserts 45a may also be configured to reduce friction between the blades 21 and the end plate 46 during relative movement between the blades 21 and the end plate 46.

[0134] 55742080-1The inserts 45a may be formed of any suitable material, such as any suitable polymer. Examples of suitable polymers may be polytetrafluoroethylene (PTFE), nylon or polyetheretherketone (PEEK).

[0135] In Figure 1C, the blades 21 are in contact with the cable 100a held by the clamping assembly 20, with the blades 21 providing uniform contact around the circumference of the cable 100a for the clamp 10. As outlined above uniform contact around the circumference of a cable held by the clamp 10 may help to maintain the circular cross-sectional shape of the cable, avoiding damage to the cable that may be caused by changes in its cross-sectional shape.

[0136] Figure 1D simply shows the clamp 10 in gripping engagement with cable 100b with a larger cross-sectional diameter than that shown in Figure 1C. Again, the plurality of blades 21 uniformly distributed around the passage 60 of the clamp 10 ensures uniform contact around the circumference of the cable 100b by the clamp 10.

[0137] Figure 1E provides an isometric view of a removable insert 24 for the blades 21 of the clamping assembly 20. The removable insert comprises a body portion 28, comprising a plurality of attachment points 27 to allow the removable insert to be removably connected to a blade 21 of the clamping assembly 20. Any suitable means may be used to removably connect the removable insert to a blade 21 , for example any suitable fastener. The removable insert 24 further comprises a contact pad 26, configured to be the point of a blade 21, and thus the point of the clamping assembly 20, closest to the passage 60 of the clamp 10 in use, and therefore the portion of the clamping assembly 20 which contacts the object to be gripped by the clamp 10. The contact pad 26 may be formed of any suitable polymer. For example, the contact pad 26 may be formed of a rubber, such as a fibre filled rubber. The contact pad 26 may be formed of a material with a high coefficient of friction. This may help to increase the friction between the clamp 10 and the object held by the clamp, thus improving the security and stability of the clamp’s grip on the object.

[0138] The contact pad 26 may be formed of a deformable material. Therefore, the contact pad may deform when the clamp 10 is in gripping engagement with the cable 100. Deformation of the contact pad 26 may increase the contact area between the cable 100 and the clamp 10, thus increasing the friction between the clamp 10 and the cable 100.

[0139] 55742080-1Increased contact area between the contact pad 26 and the cable 100 may also help to reduce the pressure applied to the cable 100 by each blade 21 when gripped by the clamping assembly 20, helping to reduce damage to the cable 100.

[0140] Figure 11 provides detailed view the second end 47 the clamp 10. The second end of the clamp 47 comprises the second end plate 47, defining an opening 51 therethrough to accommodate the cable 100 within the clamp 10. As shown from figure 11, the frame 40 further comprises two support legs 49 extending from the base 43 of the frame 40 to the second end plate 47. The second end plate 47 may be locked to the support legs 49 of the frame 40, as part of the lock arrangement 50 of the clamp. For example, when the clamp 10 is in the closed position, the bolts 50d may be inserted through the support legs 49 and the second end plate 47, to help lock the clamp 10 in the closed position. When it is required to move the clamp to the open position, the bolts 50d may be removed to allow the clamp 10 to be opened.

[0141] Figure 2 provides a side view of the clamp 10 of the present disclosure, wherein the load collar 33 has engaged the actuation surfaces 22 of each blade 21, with the clamp 10 in gripping engagement with an electric cable 100. In this example, the clamp 10 is disposed on the deck 150 of a vessel, with the second end 47 of the clamp positioned towards an outboard (AFT) end of the vessel, wherein the electric cable 100 hangs off the rear of the vessel, towards the seabed. The first end 46 of the clamp 10 is directed towards an inboard / forward (FWD) end of the vessel.

[0142] As outlined above, the blades 20 of the clamp 10 may be movable towards at least one of the first and second ends 46, 47 of the frame 40 of the clamp. As the clamp 10 is in gripping engagement with the electrical cable 100, variable loads imparted on the cable 100 via the motion of the water, motion of the vessel, or both. Again, the lost motion arrangement 90 may permit movement of the blades 21 towards one of the first or second ends 46, 47 to account for such variable loads.

[0143] For example, rising water due to a wave may lift the cable 100 towards the vessel. In turn, the friction between the cable 100 and the clamping assembly 20 may provide a drag force on the blades 21 of the clamping assembly 20 towards the inboard (FWD) end of the vessel. Therefore, the blades 21 may move towards the first end 46 of the frame 40 of the clamp 10, with the force imparted on the actuating surface 22 of each

[0144] 55742080-1blade 21 by the load collar 33 being reduced, relaxing the clamp’s grip on the cable 100. How far the blades 21 may travel towards the inboard end may be limited by the lost motion arrangement 90, as movement of the blades 21 towards the inboard end will cause the end stop 94 of each blade 21 to engage the lost motion plate 92, with further motion of the blades 21 towards the inboard end being resisted by the lost motion plate 92 compressing the spring 96. Once the drag force between the cable 100 and the clamping assembly 20 has been removed, the bias of the spring 96 may assist to bias the lost motion plate 92 towards the second end 47 of the frame 40, urging the blades 21 back into engagement with the load collar 33, to ensure a sufficient clamping force is applied to the cable 100. As outlined above, the spring 96 may also be configured to provide a preload, to ensure the actuation surface of each blade remains in contact with the load collar 33, even when the blades 21 of the clamping assembly 20 are dragged towards the inboard end of the vessel / first end 46 of the clamp 40.

[0145] Alternatively, falling water levels may drag the cable 100 towards the seabed. Therefore, increased frictional forces between the cable 100 and the clamping assembly 20 may cause the cable 100 to exert a drag force on the clamping arrangement 20 towards the outboard (AFT) end. In turn the blades 21 may be urged towards the second end 47 of the frame 40 of the clamp 10. Dragging of the blades 21 in this direction will therefore increase the force between the load collar 33 and the actuating surface of each blade 21, thereby increasing the clamp’s gripping force on the cable 100, helping to account for the additional force required to now securely hold the cable 100.

[0146] Therefore, linear movement of the blades 21 of the clamping assembly 20 of the clamp 10 can naturally account for variable external forces being applied to the cable 100, ensuring the cable 100 remains stably and securely held at all times.

[0147] Figure 3A provides an isometric view of the clamp 10 of the present disclosure in gripping engagement with an electric cable 100. As shown, the load cylinders 34 have been extended (in the direction of arrow 80a) to bring the load collar 33 into engagement with the actuation surface 22 of each blade 21, thus bringing the clamping assembly 20 of the clamp 10 into gripping engagement with the cable 100.

[0148] In Figure 3B, the load cylinders 34 have been fully retracted (in the direction of arrow 80b) thereby retracting the load collar 33 and reducing or removing the force imparted

[0149] 55742080-1by the load collar 33 on the actuation surface 22 of each blade 21 , therefore reducing or removing the gripping force imparted by the clamping assembly 20 of the clamp 10 on the cable 100.

[0150] Figure 4A provides an isometric view of an embodiment of the clamp 10 of the present disclosure in an open configuration, allowing a cable 100 to be inserted or removed from the clamp 10.

[0151] As described above, the frame 40 of the clamp 10 is configurable between an open configuration and a closed configuration, to allow insertion or removal of an elongate object to be gripped. As can be seen in Figure 4A, each of the bolts 50a, 50b, 50c, 50d of the lock arrangement 50 have been removed from their respective slots, allowing the frame 40 to be reconfigured to an open configuration. Once the bolts 50a, 50b, 50c, 50d of the lock arrangement 50 have been removed, the frame 40 may pivot open about the hinges 44a, 44b (hinge 44b not shown) to open the clamp 10. Therefore, the clamp 10 may open and close in as a ‘clamshell’ style configuration; as best shown in Figure 4B.

[0152] Each end plate 46, 47 is assembled as two halves, with the two halves of the first end plate 46 joined at the lower end of the first end plate 46 at hinge 44a, and joined (when in the closed configuration) at the upper end of the first end plate 46 by bolt 50a. The two halves of the second end plate 47 are joined at their lower end at hinge 44b, and at their upper end (when in the closed configuration) by bolt 50b. As described in relation to Figure 11, each half of the second end plate 47 is also held in the closed position by the frame 40, via bolts 50d locking the second end plate 47 to legs 49 of the frame 40.

[0153] The clamping assembly 20 is also configured as an assembly of two halves, joined at the upper end of the load collar 33 (when in the closed configuration) by bolt 50c. Bolt 50c is a mechanical bolt comprising two pins 52 received within corresponding slots 53 on the load collar 33. The mechanical bolt 50c further comprises a single lever 54, connected to each pin 52 via a common mechanical linkage 55, with the lever 54 therefore able to move both pins 52 simultaneously. For example, when a pulling force is exerted on the lever 54, the common mechanical linkage 55 allows both pins 52 to be withdrawn from their respective slots 53 on the load collar 33. Conversely, exerting a push force on the lever 54 acts to move the pins 52 towards their respective slots 53 via the common mechanical linkage 55. In other words, the clamping assembly 20 may be

[0154] 55742080-1configured to the unlocked configuration by pulling on the lever 54 of the bolt 50c, and reconfigured to the locked configuration by pushing on the lever 54 of bolt 50c.

[0155] Therefore, removal of bolts 50a, 50b, 50c, 50d allows for the clamp to be unlocked, and moved to an open position. As shown in Figures 4A and 4B, each of the end plates 46, 47 may be split, and pivoted about their respective hinges 44a, 44b. As the end plates 46, 47 are mechanically connected to the load collar (in this example via the load collar guides 42 and load collar bushings 32), movement of each end plate 46, 47 to the open position will also separate the load collar 33, and thus the clamping assembly 20, to the open position.

[0156] To close the clamp, each half of each end plate 46, 47 may be pivoted back towards the closed position, thereby also moving the clamping assembly 20 back to the closed position; with bolts 50a, 50b, 50c, 50d being reinserted to lock the clamp closed.

[0157] As outlined above, the base cylinders 48 may be used to assist with opening and closure of the clamp 10, with the cylinders 48 being retracted the move the clamp 10 to the open position (as shown in Figures 4A and 4B), and extended to move the clamp 10 towards the closed position (as shown in Figures 3A and 3B, for example).

[0158] Figures 6A and 6B provide a schematic of a system 1000 including the clamp 10 of the present disclosure. In this example the system demonstrates the use of the clamp 10 in laying electric cables (500, 600) subsea.

[0159] The system 1000 of Figure 5A comprises a vessel 800 for laying a first length of electric cable 500 on the seabed 700. The vessel 800 carries a cable reel 200 (otherwise termed as a cable drum or carousel), upon which the first length of electric cable 500 is stored prior to being laid. The system 1000 further comprises a cable tensioner 300 disposed on the vessel 800, used to maintain tension in the cable 500 when it is being laid, providing a smooth and controlled laying process, minimizing the risk of snags or tangles, and regulating the tension in the cable 500 to prevent it from snapping or experiencing excessive stress.

[0160] The system 1000 further comprises the clamp 10 of the present disclosure at the rear (aft) end of the vessel 800; and a cable chute 400 to guide a cable 500 as it exits the

[0161] 55742080-1vessel 800 (at the aft end of the vessel 800) and enters the water, preventing it from rubbing against the vessel's hull or other structures, and preventing any sharp bends in the cable 500, which may cause damage to the cable 500.

[0162] In use, a first length of cable 500 is fed from the reel 200 to the seabed 700 via the tensioner 300, clamp 10 and cable chute 400 respectively, as shown in Figure 5A. While the first length of cable 500 is being laid, the clamp 10 is not in gripping engagement with the cable 500, allowing the cable 500 to freely pass through the clamp 10 and be progressively laid on the seabed 700.

[0163] In one scenario, as shown in Figure 5B, once the first length of cable 500 has been laid, the clamp 10 engages the first length of cable 500, ensuring the first length of cable 500 remains held by the vessel 800. This may allow the first length of cable 500 to be held securely in place while it is connected to a second length of cable 600, such that cable lay operations may continue and the length of cable disposed on the seabed may be increased.

[0164] In an alternative scenario, the entire length of the first length of cable 500 may be disposed on the seabed 700, with the vessel 800 returning to shore to be loaded with additional lengths of cable. The vessel 800 may then return to the site of the first length of cable 500 and lift an end of the first length of cable 500 to the clamp 10, such that the first length of cable 500 is securely gripped by the clamp 10, and therefore held by the vessel 800. Again, this may allow a second length of cable 600 to be connected to the first length 500, to allow cable lay operations to continue and the length of cable disposed on the seabed may be increased.

[0165] Although the above examples relate to the use of the clamp 10 of the present disclosure to grip an electric cable, it will be appreciated by one skilled in the art that the clamp 10 may be used to grip any suitable elongate object, such as a length of pipe, or section of wellbore casing for use in lining a wellbore in a subterranean reservoir.

[0166] 55742080-1

Claims

28CLAIMS:

1. A clamp apparatus for gripping an elongate object, the clamp apparatus comprising:a frame defining a passage therethrough for receiving an elongate object; a clamping assembly mounted on the frame and at least partially circumscribing the passage, the clamping assembly comprising a plurality of blades movable between a clamping position in which a radial clamping force is applied to the object when located within the passage, and a release position in which a radial clamping force is not applied to the object when located within the passage, each of the plurality of blades comprising an actuation surface; and,an actuator mounted on the frame and configured to impart a force on the actuation surface of each blade to move the plurality of blades towards the clamping position.

2. The clamp apparatus of claim 1, wherein the elongate object is an electrical cable.

3. The clamp apparatus of claims 1 or 2, wherein the frame comprises a first end and a second end, the passage extending between the first and second ends of the frame.

4. The clamp apparatus of claim 3, wherein the actuator is a linear actuator acting linearly between the first and second ends of the frame.

5. The clamp apparatus of claim 4, wherein the actuation surface of each blade is configured to transform the linear force of the actuator to the radial force imparted towards the central axis.

6. The clamp apparatus of claim 4 or 5, wherein the clamp comprises a load collar, wherein the load collar is configured to be substantially co-axial with, and circumscribe, the passage, and wherein the load collar is configured to engage the actuation surface of each blade.55742080-17. The clamp apparatus of claim 6, wherein the frame comprises at least one load collar guide extending between the first and second ends of the frame, wherein the at least one load collar guide is configured to constrain the load collar to linear movement between the first and second ends.

8. The clamp apparatus of any one of claims 3 to 7, wherein the plurality of blades are linearly movable towards at least one of the first and second ends of the frame.

9. The clamp apparatus of any preceding claim, wherein the actuation surface comprises an inclined surface, wherein the inclined surface extends away from the passage.

10. The clamp apparatus of claim 9, wherein the inclined surface defines an acute angle with central axis of the clamp, with the inclined surface preferably forming an angle in the range of 5° to 10° with the central axis of the clamp.

11. The clamp apparatus of any preceding claim, wherein at least one blade comprises a removable insert, wherein, in use, the removable insert defines a portion of the blade closest the passage of the clamp.

12. The clamp apparatus of claim 11, wherein the removable insert comprises a contact pad, wherein the contact pad defines the portion of the blade that contacts the elongate member held by the clamp.

13. The clamp apparatus of claim 12, wherein the contact pad is formed of a deformable material.

14. The clamp of claims 12 or 13, wherein the contact pad is formed of a polymer.

15. The clamp apparatus of any preceding claim, wherein clamping assembly comprises at least 8 blades.

16. The clamp apparatus of any preceding claim, wherein each of the plurality of blades are substantially uniform with one and other.55742080-117. The clamp apparatus of any preceding claim, wherein the frame is configurable between an open configuration and a closed configuration, wherein, when in the open configuration, the elongate object may be positioned within the passage.

18. The clamp of claim 17, wherein the frame comprises a lock arrangement configurable between a locked configuration to maintain the clamp in a closed configuration, and an unlocked configuration to allow the clamp to be reconfigured to an open configuration.

19. A system for installing an elongate object, the system comprising:a first elongate object;a tensioner configured, in use, to control the tension of the elongate object as it is installed; and,a clamp according to any one of claims 1 to 18;wherein, in use, the clamp selectively clamps a second elongate object to permit connection of the first elongate object to the second, prior to the first elongate object being installed.

20. A method of clamping an elongate object, the method comprising:providing a clamp apparatus comprising:a frame defining a passage therethrough for receiving an elongate object; a clamping assembly mounted on the frame and at least partially circumscribing the passage, the clamping assembly comprising a plurality of blades moveable between a clamping position in which a radial clamping force is applied to the object when located within the passage, and a release position in which a readily clamping force is not applied to the object when located within the passage, the plurality of blades each comprising an actuation surface; and,an actuator mounted on the frame and configured to impart a force on the actuation surface of the at least one blade to move the at least one blade towards the clamping position;inserting an elongate object into passage the clamp; and,imparting a force on the actuation surface of each of the plurality of blades, wherein said force is transferred to the blades via the actuation surface to move the clamping assembly into a clamping position and impart a radial clamping force to the elongate object.55742080-121. The method of claims 20, further comprising increasing the force imparted on the actuation surface by the actuator to increase the radial clamping force between the clamping assembly and elongate object.

22. The method of claim 21, further comprising reducing or removing the force imparted on the actuation surface by actuator to reduce or remove the radial clamping force between the blade and the elongate object, to allow for the elongate object to be released from the clamp.

23. The method of any one of claims 20 to 22, wherein the frame comprises a first end and a second end.

24. The method of any one of claims 24, wherein the actuator is a linear actuator, movable linearly between he first and second ends of the frame; and,wherein the actuation surface comprises an inclined surface inclined away from the passage of the frame; and,the method further comprising transforming, via the actuation surface, the linear force of the actuator to a radial force to move the plurality of blades towards the clamping position and apply a radial clamping force on the elongate object.

25. The method of any one of claims 20 to 25, wherein the elongate object is an electrical power cable.55742080-1

Images