A turret connecting module for a floating offshore system of a wind turbine, and a floating offshore system comprising a turret connecting module

Abstract

A turret connecting module (100) for being selectively inserted in an operating position (O) within a weathervaning floating offshore structure (200) of a wind turbine (202) for connecting said weathervaning floating offshore structure (200) to a pre-laid mooring system (300), the turret connecting module (100) comprising: an external trunk element (1) configured to be attached to the weathervaning floating offshore structure (200); an internal shaft element (2) configured to be arranged within the external trunk element (1), and comprising a base portion (22) configured to be coupled to the pre-laid mooring system (300); and a bearing system (3) comprising at least one bearing (31, 32) configured to connect the external trunk element (1) to the internal shaft element (2) such that the external trunk element (1) is allowed to weathervane together with the weathervaning floating offshore structure (200) relative to the internal shaft element (2) and the prelaid mooring system (300).

Description

[0001] A turret connecting module for a floating offshore system of a wind turbine, and a floating offshore system comprising a turret connecting module

[0002] TECHNICAL FIELD

[0003] The present invention relates to a turret connecting module for being selectively inserted into a weathervaning floating offshore structure of a wind turbine for connecting said weathervaning floating offshore structure to a pre-laid mooring system. The invention further relates to a floating offshore wind turbine (FOWT) system comprising a weathervaning floating offshore structure of a wind turbine, a pre-laid mooring system and a turret connecting module configured to be inserted into the weathervaning floating offshore structure for connecting the weathervaning floating offshore structure of the wind turbine to the pre-laid mooring system.

[0004] PRIOR ART

[0005] The invention belongs to the field of floating offshore structures and more specifically to the field of floating offshore wind turbines (FOWT), but could be of application to the fields of wave energy converters and tidal stream turbines. Various prior art solutions have been explored in this domain, aiming to enhance the ease of installation and functionality of FOWT systems. The following overview highlights some of these prior art solutions along with their associated disadvantages.

[0006] In the field of offshore wind turbines, it is known to use a turret connector configured as a single turret element which is connected to a weathervaning floating offshore structure by means of separate bearings which are directly attached to the weathervaning floating structure. This known solution has several disadvantages.

[0007] Firstly, the fact that the bearings are independent of the turret connector means that complex operations are required in the event of having to perform any maintenance operation. The direct attachment of the bearings to the weathervaning structure makes it difficult to access and service these components, leading to increased downtime and operational costs. If there is a failure in any bearing of this prior art solutions, the turret connector must be removed for allowing the maintenance operation, wherein then the turret has to be carefully arranged again in its position relative to the weathervaning floating offshore structure. This sometimes implies having to transport the weathervaning floating offshore structure to a port.

[0008] Furthermore, in this known solution, the bearing is assembled / arranged in a static predetermined position, which causes a concentration of mechanical stresses in the same specific area of the bearing due to the wind thrust force (where in some geographical areas there is a natural tendency for the wind to flow in a certain direction, resulting in a part of the bearing normally being subjected to higher mechanical stresses), which significantly reduces bearing life and brings forward the need for maintenance work on the system. The concentration of stresses can lead to premature failure of the bearing, resulting in unplanned downtime and costly repairs which implies towing the platform to the port and taking it out of the water.

[0009] Most connectable weathervaning floating platforms are attached to a buoy that is moored to the seabed using a catenary system. This setup allows the buoy to be easily repositioned and oriented toward the turret connection interface. However, in case a tension leg platform (TLP) as a mooring system reduces the self-alignment capability and vertical displacement of quick connector engaging interfaces.

[0010] Finally, most of the weathervaning floating structures / platforms are built in welded structures. But in those processes, it is hard to achieve the needed accuracy for the bearings assembly. The roundness, flatness and concentricity (in case more than one bearings are used) are crucial for the reliability of the system. In case of deviations, it is needed to machine the interfacing structures in situ which is in most of the cases complex, expensive and not as accurate as it is achieved in machining shops.

[0011] Therefore, there is a need for a solution that overcomes these disadvantages. The present invention seeks to address these issues by providing a turret connecting module that can be selectively inserted into a weathervaning floating offshore structure for effectively connecting the weathervaning floating offshore structure to a pre-laid mooring structure. The turret connecting module comprises an external trunk element, an internal shaft element, and a bearing system, providing a more robust and maintainable solution.

[0012] SUMMARY OF THE INVENTION

[0013] The present invention aims to provide a connector for connecting a weathervaning floating offshore structure to a pre-laid mooring system (also referred to as pre-laid mooring structure) that eliminates the above-mentioned problems, reducing complexity, increasing service life, and greatly improving reliability and serviceability of the FOWT system / array.

[0014] A first aspect of the invention relates to a turret connecting module for use in a weathervaning floating offshore structure of a wind turbine (e.g. the weathervaning floating offshore structure comprising at least one wind turbine). The turret connecting module is configured to connect the weathervaning floating offshore structure to a pre-laid mooring system. In particular, the turret connecting module is configured to be selectively inserted into (and / or removed from) a receiving portion of the weathervaning floating offshore structure, and to be arranged in an operating position (i.e. within, or relative, to the receiving portion) in which the turret connecting module connects said weathervaning floating offshore structure to the pre-laid mooring system. In other words, the operating position is configured to allow the turret connecting module, once has been inserted into the receiving portion, to be connected to the pre-laid mooring system, thereby connecting the weathervaning floating offshore structure to the pre-laid system. In the context of the present invention, the term “selectively” connected / attached refers to the ability of the relevant element of the invention to be operatively engaged and disengaged as required.

[0015] The insertion of the turret connecting module into the respective receiving portion may be carried out, depending on the specific configuration of the embodiments, upwardly (i.e. by inserting the turret connecting module through a bottom part / portion of the receiving portion- e.g. through a respective base opening of the receiving portion - and then displacing the turret connecting module upwards until reaching the respective operating position) or downwardly (i.e. by inserting the turret connecting module through a top hatch of the receiving portion - and then displacing the turret connecting module downwards until reaching the respective operating position).

[0016] The turret connecting module comprises an external trunk element (also referred to as external trunk), an internal shaft element (also referred to as internal shaft), and a bearing system. The external trunk element may be configured as a tubular element / body (the external trunk element may also be referred to as external tubular element / body). The external trunk element comprises a top portion and a base portion, wherein the top portion is configured to be attached / coupled (e.g. rigidly attached / coupled) to the weathervaning floating offshore structure (e.g. the external trunk element may be attached -e.g. to the receiving portion- such that there is no relative movement between the external trunk element and the weathervaning floating offshore structure). The external trunk element is compatible with a plurality of configurations. Preferably, the external trunk element comprises an outer surface and is configured such that the outer surface is spaced apart by an assembly gap (measured in a radial direction) with respect to the receiving portion (e.g. with respect to an inner surface of the receiving portion facing the external trunk element). The external trunk element is configured to receive the internal shaft element (e.g. the external trunk element may comprise an inner receiving space configured to lodge / receive the internal shaft therein). The internal shaft element, also comprises a top portion and a base portion, is configured to be arranged within the external trunk element (e.g. the external trunk element may be configured as a casing to house the internal shaft), wherein its base portion is configured to be coupled to the pre-laid mooring system. In the context of the present invention, the terms “top portion” and “base portion” of the external trunk element or of the internal shaft element respectively refer to the upper portion and the lower portion of the said elements when the turret connecting module is arranged vertically (e.g. when arranged in its operating position). In some embodiments, the term “intermediate portion” may be used to refer to an intermediate area / portion that may be located between the respective “top portion” and the ’’base portion” of each of the external trunk element and the internal shaft element.

[0017] The bearing system includes at least one bearing that connects the external trunk element to the internal shaft element. This connection is configured to allow the external trunk element to weathervane together with the weathervaning floating offshore structure relative to the internal shaft element and the pre-laid mooring system.

[0018] The turret connecting module is configured to be arranged in an operating position within the weathervaning floating structure, effectively connecting the weathervaning floating offshore structure to the pre-laid mooring system. This innovative design allows for efficient and effective operation of offshore wind turbines, enhancing their stability and performance in various weather conditions. In particular, the fact that the turret connecting module is configured as a module configured to be selectively inserted into the weathervaning floating offshore structure may be understood as referring to the fact that the turret connecting module may be configured to be inserted into (and / or removed from) the weathervaning floating offshore structure as a whole (e.g. as a unitary device / module).

[0019] In the context of the present invention, a pre-laid mooring system (also referred to as stationkeeping system) is interpreted as referring to a system configured as an interface for connecting a floating offshore platform or structure (e.g. a weathervaning floating offshore structure for supporting a wind turbine) to the seabed to maintain the floating offshore platform / structure in a predetermined location relative to the seabed. The term “pre-laid” indicates that the mooring system is installed or anchored to the seabed prior to the deployment or installation of the floating offshore structure. The pre-laid mooring system may comprise flexible mooring elements, such as chains, ropes, synthetic cables and anchors, and / or may include rigid or semi-rigid seabed-fixed structures configured to provide a mechanical connection point for the turret connecting module and to stabilise the floating structure. This system is used, for example, to secure and stabilize floating offshore wind turbines in their designated locations, allowing them to generate electricity efficiently and safely, even in deepwater environments. A non-limiting example of pre-laid mooring system is represented by tension leg platforms TLP, wherein a plurality of mooring lines (e.g. three or more “tension legs”) are tensioned to provide the necessary stability and support for the weathervaning floating offshore structure of a wind turbine, thereby the TLP being configured to remain in a static or quasi-static position. Proper tensioning ensures that the turbine (i.e. the weathervaning floating offshore structure over which the wind turbine is installed) remains in its intended position and can withstand the dynamic forces exerted by the marine environment. However, the pre-laid mooring system is also compatible with other configurations, such as with a catenary configuration.

[0020] In the context of the present invention, a weathervaning floating offshore structure may comprise one or more wind turbines and may be configured according to a plurality of configurations (e.g. the weathervaning floating offshore structure may be interpreted as referring to a floating support structure / platform for wind turbines). The weathervaning floating offshore structure may also be referred to as floating platform. The feature “a weathervaning floating offshore structure of a wind turbine” refers to the fact that the floating offshore structure is suitable for receiving a wind turbine. The term offshore is considered to mean (i.e. is replaceable with) the term marine, while the term weathervane refers to the ability of the structure to orient / rotate (e.g. passively) depending on the wind direction (i.e. the term weathervaning is replaceable with the term orientable / rotatable). The weathervaning floating offshore structure comprises a receiving portion (e.g. configured as being part of a pivot column) configured to receive by insertion a turret connecting module according to the first aspect of the invention for connecting the weathervaning floating offshore structure to a pre-laid mooring system. The weathervaning floating offshore structure may be configured as a polygonal (e.g. triangular) floating base comprising a plurality of vertices (e.g. three vertices in the case of the triangular configuration), wherein the receiving portion may be arranged at one of the vertices. The pivot column refers to the element comprising a vertical geometrical axis (e.g. the vertical axis provided by the turret connecting module) about which the weathervaning floating offshore structure is configured to weathervane (i.e. rotate).

[0021] The turret connecting module may comprise at least one radial bearing as part of the bearing system. Each radial bearing may comprise an outer interface and an inner interface. The outer interface may be configured to be in contact with the external trunk element (e.g. with an inner surface of the inner receiving space of the external trunk element, said inner surface facing the internal shaft element), and the inner interface is configured to be in contact with the internal shaft element (e.g. with an outer surface of the internal shaft element). This arrangement of the radial bearing causes this element to be also referred to as neck bearing. The term radial refers to the configuration / capacity of this bearing to support radial loads (i.e. loads received by the bearing in a radial direction with respect to the turret connecting module, which is configured to extend longitudinally along an axial direction - which is a vertical direction in the operating position - and radially along any direction being perpendicular to the axial direction). Preferably, the radial bearing may be arranged at (or proximal to) the base portion of the external trunk and / or the base portion of the internal shaft element.

[0022] The radial bearing may be configured as a slew bearing (e.g. a ball bearing) comprising a plurality of rolling-elements arranged between two respective ring elements, thereby enabling a rotational movement between the two ring elements (i.e. one ring element being attached to the outer interface and one ring element being attached to the inner interface), such that the inner and the outer interfaces of the radial bearing are each arranged at one of the ring elements. However, in preferred embodiments, the radial bearing may be configured as a friction bearing (also known as plain bearing or journal bearing) configured to provide sliding motion between the respective surfaces of the external trunk element and the internal shaft element. In this last configuration, the outer interface may be configured to be attached to the external trunk element and the inner interface may be configured to be in sliding contact with the internal shaft element.

[0023] The bearing system of the turret connecting module may comprise a top bearing, wherein the top bearing may comprise a respective outer interface and a respective inner interface. The outer interface of the top bearing may be configured to be attached on top (i.e. above) of a contact interface of the top portion of the external trunk element. This allows the top bearing to support mainly axial loads (i.e. those loads received along the axial direction of the turret connecting module, which is a vertical direction when arranged in its operating position) and also residual radial loads (e.g. those not taken by the radial bearing). Thus, the outer interface may be configured to be supported (e.g. vertically supported) by the contact interface of the top portion of the external trunk element. Therefore, the outer interface of the top bearing may be configured such that, when the weathervaning floating offshore structure weathervanes together with the external trunk element about the internal shaft element (which is rigidly connectable to the pre-laid mooring system), then the outer interface of the top bearing also rotates / weathervanes together with the external trunk element. The inner interface of the top bearing may be configured to be in contact with the internal shaft element, preferably to be attached on top of a contact interface of the top portion of the internal shaft element.

[0024] The top bearing may be configured as a slew bearing comprising a plurality of rolling-elements arranged between two respective ring elements, thereby enabling a rotational movement between the two ring elements, such that the inner and the outer interfaces of the top bearing are each arranged at one of the ring elements. In other embodiments, the top bearing may be configured as a friction bearing (also known as plain bearing) configured to provide sliding motion between the respective surfaces of the external trunk element and the internal shaft element. The external trunk of the turret connecting module may comprise (or may be configured to include as) a first structural element arranged in the top portion of the external trunk element, a second structural element arranged in the base portion of the external trunk, and an intermediate structure configured to structurally connect the first structural element to the second structural element. Preferably, the first structural element and / or the second structural element may be configured as respective tubular portions (e.g. as a cylinder / ring or as a regular prism with regular polygon bases. The first structural element may be configured to be connected to the outer interface of the top bearing, and the second structural element may be configured to be connected to the outer interface of the radial bearing. Preferably, the intermediate structure may comprise a plurality of openings (e.g. at least one opening configured to provide access to the bearing system, e.g. to the radial bearing) and / or a plurality of elongated structural elements (e.g. wherein the elongated structural elements may be arranged such that the plurality of openings is defined by a separation space between the elongated structural elements), such as structural rods. The plurality of openings refers to a plurality of open spaces configured to provide accessibility though the external trunk element to any part arranged within the external trunk (e.g. the internal shaft element or a part of the top bearing and / or the radial bearing). The fact of having a plurality of elongated structural elements (i.e. structural elements configured, for example, as rods or bars) inherently provides openings when they are arranged providing a distance between each elongated structural element, and also makes it possible to selectively replace any of these parts being damaged. Simultaneously, the plurality of elongated structural elements also provide the external trunk element with an increased flexibility while being completely functional from an structural point of view. In addition, the plurality of elongated structural elements may be distributed so as to reduce stresses in some specific areas. The plurality of elongated structural elements may comprise three or more elongated structural elements, e.g. evenly distributed so that the plurality of separation spaces between elongated structural elements are similar or identical.

[0025] The turret connecting module may be further configured such that, when the turret connecting module is arranged in the operating position within the weathervaning floating offshore structure, the base portion of the external trunk and / or the base portion of the internal shaft element protrude (e.g. at least partially) from a bottom part of the receiving portion of the weathervaning floating offshore structure. This configuration is helpful for making the connection of the turret connecting module to the pre-laid mooring system easier.

[0026] In some embodiments, the external trunk element may further comprise a functional perimetral area / zone (also referred to as bending perimetral area / zone or perimetral area / zone with a reduced stiffness) arranged in the top portion of the external trunk element. The functional perimetral area may comprise a plurality of elongated apertures, having the purpose of providing a reduced bending stiffness of the external trunk element (i.e. with respect to the rest of the external trunk element). This has the effect of causing a reduction in the stresses of the top portion of the turret connecting module (especially those of the top portion of the external trunk element when it is connected to the receiving portion) Thus, for example, any welding arranged in the top portion of the turret connecting module receives a reduced stress caused by any changes in the direction of the radial loads, which may cause a variation in the assembly gap (optional feature described below) of the base portion of the external trunk element. Preferably, the plurality of elongated apertures may comprise: one or more rows (e.g. one, two, three, four or five) of elongated apertures horizontally distributed over the functional perimetral area; and / or one or more rows (e.g. one, two, three, four or five) of elongated apertures distributed obliquely over the functional perimetral area. The term horizontally should be interpreted when considering the turret connecting module arranged in the operating position, i.e. vertically. The term obliquely refers to an arrangement of the respective elongated opening with an inclination with respect to the horizontal direction.

[0027] Preferably, the functional perimetral area may be arranged in the top portion but spaced away from the end part (e.g. the highest part) of the top portion, e.g. by a distance being a percentage of a diameter of the external trunk element (e.g. the distance being in the range 20% to 150% of the diameter, preferably in the range 30% to 80%, more preferably 40 to 60% (being 50% a preferred value). It should be noted that the external trunk element may be configured as a tubular element having a circular cross-section, but also having a shape of a regular polygon (so that the diameter used as a reference may correspond to that of a circle being tangent to all the sides of the regular polygon or to that of a circle comprising all the points being vertices of the regular polygon). Further, the length (i.e. the height or vertical extension) of the functional perimetral area may correspond to a percentage of the diameter of the external trunk (e.g. said length may be in the range of 10% to 150% of the diameter, preferably in the range 20% to 90% of the diameter, more preferably in the range 30% to 70% or 35% to 60%).

[0028] The base portion of the internal shaft element of the turret connecting module may comprise a base connector configured to be selectively coupled to (i.e. coupled to and decoupled from) the pre-laid mooring system, preferably when the turret connecting module is arranged in the operating position. In preferred embodiments, the base portion of the internal shaft element may further comprise a coupling connector configured to connect the base connector to the base portion of the internal shaft element. More preferably, the coupling connector may be configured as an elastic coupling connector configured to absorb (i.e. receive) radial loads when the base connector is coupled to the pre-laid mooring system. The base connector feature allows for a secure and efficient connection between the turret connecting module and the pre-laid mooring system, facilitating the transfer of loads and movements between the weathervaning floating offshore structure and the mooring system.

[0029] In embodiments of the invention, the top portion of the external trunk of the turret connecting module may comprise a contact element, which may be an integral part of the top portion of the external trunk element. The contact element may be configured such that, when the turret connecting module is arranged in the operating position (i.e. relative to the weathervaning floating offshore structure), the contact element contacts on top of a contact interface (i.e. on top refers to a vertical contact between the contact element and the contact interface, wherein the contact element is above the contact interface, such that at least a part of a weight of the turret connecting module is supported by the contact interface) of the weathervaning floating offshore structure. This configuration allows the turret connecting module to be supported / kept in the operating position. In preferred embodiments, the contact element may be configured as one or more perimetral protruding portions (e.g. flange portions) configured to locally increase a radius of the turret connecting module. For example, the contact element may have an annular configuration (e.g. ring configuration). Preferably, the contact element may be configured as a contact ring (e.g. as a single flange portion defining a ring).

[0030] The contact element may further comprise one or more attaching means (e.g. mechanical connectors, such as a plurality of screws) configured to attach the contact element to the contact interface of the weathervaning floating offshore structure, such that the contact element is rigidly attached / connected to the contact interface. Thus, the aforementioned feature of “the external trunk element being configured to be attached / coupled to the weathervaning floating offshore structure” may be realized by means of the connection provided by said attaching means.

[0031] In some embodiments, the contact element may be configured to be removably connected to the top portion of the external trunk. A contact element thus configured permits a selective connection of the contact element to the top portion of the external trunk. This allows the turret connecting module to be inserted without the contact element into the weathervaning floating offshore structure, preferably through a bottom part of the receiving portion of the weathervaning floating offshore floating structure upwards, to arrange the turret connecting module in the operating position. Therefore, the contact element may be configured to be connected to (i.e. and disconnected from) the weathervaning floating offshore structure when the turret connecting module is within the receiving portion of the weathervaning floating offshore structure. In preferred embodiments, the turret connecting module may comprise one or more auxiliary connectors (e.g. configured as mechanical connectors, such as a screws) configured to selectively attach the contact element to the top portion of the external trunk element (i.e. the auxiliary connectors may be configured as removable connectors suitable for providing a selective connection between the contact element and the top portion of the external trunk element).

[0032] It should be noted that the contact element may be configured to be the widest part (e.g. the part with the greatest radial extension) of the turret connecting module (e.g. for allowing the contact element to contact with the contact interface of the weathervaning floating offshore structure). Thus, when the contact element is configured as an integral part of the top portion of the external trunk element, then the turret connecting module is suitable for being inserted into the respective receiving portion through an upper part of the receiving portion. In contrast, having a removable contact element provides the additional advantage of allowing an insertion also through a bottom part (e.g. through a base opening) of the receiving portion, since the contact element can be removed from the turret connecting module for allowing the insertion and then connected again to the turret connecting module once arranged within the receiving portion.

[0033] Preferably, the top portion of the external trunk element may be configured to be rigidly connected to the weathervaning floating offshore structure (e.g. by configuring the aforementioned contact element to be rigidly connected to the aforementioned contact interface). This feature is broadly compatible with all the embodiments of the invention. In some embodiments, the top portion of the external trunk element may be configured as the only part being rigidly attached to the weathervaning floating offshore structure, wherein the remaining of the external trunk element may be configured to provide / leave an assembly gap (also referred to as tolerance space and measurable in a radial direction) between the external trunk element (an outer surface of the external trunk element) and the receiving portion (e.g. not being in contact with the inner surface of the receiving portion), thereby not hindering the insertion of the turret connecting module within the receiving portion. This is especially compatible with those embodiments having both a top bearing and a radial bearing (wherein the radial bearing may selectively operate when there is flection in the turret connecting module causing the base portion of the external trunk element to contact with the receiving portion (e.g. with the inner surface of the receiving portion) and also is especially compatible with those embodiments having an intermediate structure and / or a functional perimetral area configured according to any of the above embodiments (wherein both the intermediate structure and the functional perimetral area provide an increased flexibility).

[0034] According to some embodiments of the invention broadly compatible with any of the preceding embodiments, the external trunk element may further comprise one or more gliding elements configured to provide an enlarged radius to the external trunk element (i.e. the gliding elements may be arranged in an outer surface of the external trunk element such that they provide the external trunk element with a greater width - i.e. distance from a central geometrical vertical axis of the turret connecting module in a radial direction). Thus, the gliding elements allow a reduction or elimination of an assembly gap (in those cases in which the assembly gap is reduced but not eliminated by the arrangement of the gliding elements, the reduced assembly gap may be referred to as radial distance, representing the distance between the gliding elements and the receiving portion -e.g. the inner surface of the receiving portion-; i.e. when the turret connecting module is inserted into the receiving portion of the weathervaning floating offshore structure, thereby enabling in some scenarios sliding contact (e.g. with a low frictional resistance) between the external trunk element and the receiving portion (e.g. with the inner surface of the receiving portion) of the weathervaning floating offshore structure (e.g. while the turret connecting module is being inserted within the receiving portion of the weathervaning floating offshore structure; or when there is an assembly gap but the external trunk element is bended or moved such that said sliding contact is produced).

[0035] Thus, the gliding elements may serve for the purpose of guiding the turret connecting module while this module is inserted into the receiving portion of the weathervaning floating offshore structure. The gliding elements may provide a greater diameter (or enlarged radius) to the part of the turret connecting module where they are arranged, such that they may be configured to be the only part of the external trunk element configured to contact with the receiving portion (e.g. with the inner surface of the receiving portion; i.e. when the turret connecting module is inserted into the receiving portion of the weathervaning floating offshore structure). The gliding elements may be configured to leave the aforementioned assembly gap between the gliding elements (which are connected to the external trunk) and the receiving portion (e.g. the inner surface of the receiving portion).

[0036] Preferably, the one or more gliding elements may be configured to be inflatable (e.g. as hydraulically mounts) (e.g. being configured as elements / pads / mounts - preferably formed by hyperelastic materials such has rubber or polyurethane - configured to vary its volume by regulating the presence of a liquid or gaseous fluid within the elements / pads / mounts, e.g. within cavities inside the elements / pads) and / or configured to be at least partially compressible and / or elastic. Thus, the gliding elements are provided with the capacity to absorb energy and / or tolerance variations between the external trunk element and the inner surface of the receiving portion of the weathervaning floating offshore structure. Furthermore, the fact of having gliding elements configured to be at least partially compressible and elastic causes these gliding elements to be able to reduce peak stresses due to high radial loads transmitted between the turret connecting module and the receiving portion. It should be noted that radial loads refer to those loads applied in a direction being perpendicular to the longitudinal direction of the turret connecting module, which is a vertical direction in the operating position, so that radial direction refers to any horizontally received load.

[0037] In the elastic and compressible configuration, the one or more gliding elements structure may be configured to elastically deform under pressure and return to its original shape upon removal of the pressure, thereby allowing a smooth sliding movement (while the turret connecting module is inserted into the receiving portion) and also allowing a reduction of the peak forces (e.g. radial forces) transmitted to the turret connecting module when this receives a radial force (e.g. when the turret connecting module is radially accelerated, for example where the turret connecting module is configured to be inserted within the receiving portion such that there is an aforementioned assembly gap between the gliding elements and the inner surface of the receiving portion.

[0038] In the selectively inflatable configuration, the one or more gliding elements structure may be configured to be selectively inflated with a fluid, such as in a hydraulic or pneumatic configuration, thereby allowing for a controlled positioning and adjustment of the turret connecting module within the receiving portion (e.g. the gliding element maybe configured to be selectively inflated to selectively eliminate the assembly gap between the gliding elements and the receiving portion, which minimize the accelerations and consequently the forces.

[0039] In some embodiments, at least one or more of the gliding elements (which may be configured according to any of the previously described configurations) may be arranged at (or proximal to) the base portion of the external trunk element, preferably coincidentally arranged with respect to the area where the radial bearing is disposed (wherein the radial bearing may be also arranged at, or proximal to, the base portion of the external trunk element). The arrangement of one or more gliding elements in the base portion of the external trunk is especially advantageous for centering the turret connecting module in the receiving portion when the turret connecting module is raised upwards (e.g. when the turret connecting module is inserted into the weathervaning floating offshore structure, or when the turret connecting module is returned to its operating position after having been moved downwards by the offset adjustment system described below).

[0040] Additionally, the gliding elements may be configured to (i.e. adapted to) operatively interact with respective gliding means of the receiving portion of the weathervaning floating offshore structure. The gliding elements may be shaped to match a shape of the gliding means having different thickness. For example, the gliding elements may be configured to provide an inclined contact surface with the gliding means for progressively centering the turret connecting module within the receiving portion. In preferred embodiments, the gliding means may be arranged in a lower part of the receiving portion to contact with gliding elements arranged coinciding with the position of the radial bearing.

[0041] Preferably, the gliding elements may be configured to have a variable thickness along a vertical direction (i.e. having different thicknesses measurable in a radial direction). For example, the gliding elements may comprise a central portion with a greater thickness (i.e. said central portion providing a greater radius to the turret connecting module) arranged between two zones / portions having a lower thickness (preferably configured as respective planar or curved slope portions). This is compatible with any configuration described for the gliding elements. Optionally, the same configuration with variable thickness (e.g. with a thicker central portion and two thinner upper and lower portions) may be replicated in the gliding means of the weathervaning floating offshore structure.

[0042] In some compatible embodiments, the gliding elements may be configured (e.g. dimensioned) to leave / provide an assembly gap (also referred to as tolerance space; which is measured in a radial direction) between them and the inner surface of the receiving portion (e.g. such that the gliding elements may be configured to contact the inner surface upon a movement a relative movement (e.g. in a radial direction) between the turret connecting module and the receiving portion - e.g. when the weathervaning floating offshore structure is moved by the water over which it is floating).

[0043] A second aspect of the invention refers to a floating offshore system (e.g. a floating offshore wind turbine FOWT) comprising: a weathervaning floating offshore structure (which may be according to the any of the aforementioned configurations described for this structure), preferably comprising at least one wind turbine; and a turret connecting module according to any of the embodiments of the first aspect of the invention. The turret connecting module is configured to be inserted in an operating position into the receiving portion of the weathervaning floating offshore structure for connecting the weathervaning floating offshore structure to a pre-laid mooring system. The pre-laid mooring system may preferably be configured as a tension-leg platform TLP, such that the weathervaning floating offshore structure is configured to rotate relative to the pre-laid mooring system to align the wind turbine to an incoming wind (i.e. when effectively connected by means of the turret connecting module). It should be noted that the pre-laid mooring system is an optional feature of the system of the second aspect of the invention, since in a first stage of connection only the turret connecting module and the weathervaning floating offshore structure are required.

[0044] According to certain embodiments, the receiving portion of the weathervaning floating offshore structure may be configured to house the turret connecting module in such a manner that the turret connecting module is transportable together with the weathervaning floating offshore structure, for example, when disconnected from the pre-laid mooring system. Preferably, the receiving portion may comprise a lower opening configured to allow the base portion of the internal shaft element of the turret connecting module to be coupled to the pre-laid mooring system. Additionally or alternatively, the receiving portion may comprise an upper opening configured to receive the turret connecting module by downwardly vertical insertion. These configurations are transversally compatible with all the embodiments of the second aspect of the invention.

[0045] In some embodiments, the floating offshore system may further comprise an offset adjustment system (also referred to as height adjustment system / device or height control system / device or offset system / device) configured to operatively connect the turret connecting module and the weathervaning floating offshore structure, and further configured to selectively cause a vertical displacement of the turret connecting module with respect to the operating position relative to the weathervaning floating offshore structure.

[0046] In some embodiments, the turret connecting module may comprise, or may be configured to be connected to, the offset adjustment system / device. Thus, the invention is compatible with embodiments in which the offset adjustment system is part of the turret connecting module of the first aspect of the invention, and with other embodiments in which the turret connecting module is part of the system of the second aspect of the invention, but not part of the turret connecting module (e.g. the offset adjustment system may be configured as an independent element of the system of the second aspect of the invention, or may be configured to be arranged in the weathervaning floating offshore structure, for example in the receiving portion). Furthermore, the invention is also compatible with embodiments in which a part (e.g. a first subsystem) of the offset adjustment system is included in the turret connecting module, while a complementary part (e.g. a second subsystem) is external to the turret connecting module (e.g. part of the weathervaning floating offshore structure or independent). However, it is noted that the technical purpose of the offset adjustment system is the same irrespective of its arrangement, namely: the offset adjustment system may be configured to selectively cause a vertical displacement of the turret connecting module with respect to the operating position (e.g. in an upward and / or in a downward direction). This feature provides several technical advantages that are developed below.

[0047] The offset adjustment system according to any of the embodiments described herein may comprise one or more mechanical means configured to provide the ability to cause the vertical displacement. The mechanical means may include, but are not limited to, components such as one or more pistons, and / or one or more winches (e.g. configured to connect the turret connecting module to the weathervaning floating offshore structure), and / or one or more strand jacks (e.g. configured to connect the turret connecting module to the weathervaning floating offshore structure). The mechanical elements may be part of the turret connecting module, although in some embodiments, some or all of the mechanical elements may be part of the weathervaning floating offshore structure.

[0048] In preferred embodiments, the offset adjustment system may be configured to cause the vertical displacement of the turret connecting module to selectively elevate the position of the turret connecting module relative to the weathervaning floating offshore structure from the operating position upwards (e.g. to reach a retracted position). Preferably, this displacement (e.g. upwards, preferably until reaching the retracted position) may reduce or eliminate a projection of the turret connecting module from a bottom part of the receiving portion of the weathervaning floating offshore structure. This configuration is especially advantageous when the turret connecting module is inserted into a weathervaning floating offshore structure that has to be transported to be arranged / deployed in a particular location (e.g. where a pre-laid mooring system has been previously arranged), since the offset adjustment system provides the possibility of moving vertically upwards the turret connecting module to protect the base of the turret connecting module (e.g. the base of the external trunk element and / or the base of the internal shaft element). The base of the turret connecting module is the part of this module that is configured to be connected to the pre-laid mooring system (e.g. by means of the optional base connector), so that is a sensible part of the overall device playing an important role in the connection to the pre-laid mooring system. The invention therefore confers an additional protection to this sensible part.

[0049] In other embodiments, the offset adjustment system may be configured to cause the vertical displacement of the turret connecting module to selectively lower the position of the turret connection module with respect to the weathervaning floating offshore structure from the operating position downwards (e.g. to reach an extended position). Preferably, this displacement (e.g. downwards, preferably until reaching the extended position) may increase a projection of the turret connection module from a bottom part of the receiving portion of the weathervaning floating offshore structure. More preferably, the base portion of the external trunk and / or the base portion of the internal shaft element may completely protrude from a bottom part of the receiving portion of the weathervaning floating offshore structure (i.e. as a result of the displacement caused by the offset adjustment system). This has the advantage of allowing an easy connection of the turret connecting module to the pre-laid mooring system, without requiring the weathervaning floating offshore structure to reduce its floatability / buoyancy for allowing the connection. This is effect is further increased when the offset adjustment system is subsequently activated to cause a relative movement of the turret connecting module upwards with respect to the weathervaning floating offshore structure, wherein the fact that the turret connecting module has already been connected to the pre-laid mooring system, causes the weathervaning floating offshore structure to descend towards (i.e. relative to) the pre-laid mooring system by the effect of the offset adjustment system.

[0050] The offset adjustment system of any of the preceding embodiments may be further configured to decouple the external trunk element from the weathervaning floating offshore structure for allowing a relative rotation of the turret connecting module with respect to the weathervaning floating offshore structure. Allowing a relative rotation of the turret connecting module with respect to the weathervaning floating offshore structure makes it possible (as a result of the rotation) to modify the part of the bearing system (e.g. of the radial bearing and / or of the top bearing) that is receiving a higher concentration of mechanical stresses and wearing the most, thereby providing a longer service life for the turret connecting module. In this regard, it should be noted that a rotation of the turret connecting module implies that the bearing system is rotated together with the turret connecting module. The offset adjustment system may comprise guiding elements configured to enable and guide rotational movement of the turret connecting module when the turret connecting module is vertically displaced as a result of an operation (e.g. a previous or a simultaneous operation) of the offset adjustment system. The guiding elements may comprise, for example, wheels and / or guides arranged in the connection between the external trunk element and the receiving portion, wherein said guiding elements may be configured to be selectively recruited for actuating (i.e. they may be configured to be movable between a functional position and a nonfunctional position).

[0051] In preferred embodiments, the system of the second aspect may further comprise a drive system (e.g. comprising one or more motors or actuators configured to cause the aforementioned relative rotation of the turret connecting module with respect to the weathervaning floating offshore structure) configured to rotate (i.e. to provide the necessary mechanical energy to cause the rotation) the turret connecting module within the weathervaning floating offshore structure about a vertical axis (e.g. a central geometrical vertical axis of the turret connecting module) when the turret connecting module is vertically displaced from the operating position due to the action of the offset adjustment system.

[0052] In some embodiments, the drive system may be configured to be independent from the offset adjustment system, while in other embodiments the drive system may be external to the turret connecting module (e.g. the drive system may be part of the weathervaning floating offshore structure or an independent element being part of the system of the second aspect of the invention). In some embodiments, the drive system may be configured to cooperate with an external drive system (e.g. arranged in the weathervaning floating offshore structure).

[0053] According to some embodiments, the receiving portion may comprise one or more gliding means arranged in an inner surface of the receiving portion. These gliding means may be configured to provide sliding contact between the inner surface of the receiving portion and the external trunk element (preferably with the one or more gliding elements of the external trunk element), e.g. when the turret connecting module is inserted within the weathervaning floating offshore structure. In a preferred embodiment, the gliding means may be further configured to be selectively inflatable and / or to be at least partially compressible (and / or elastic). This configuration allows the gliding means to absorb potential tolerance variations and potential radial loads between the external trunk element and the inner surface of the receiving portion. This feature enhances the durability and operational efficiency of the floating offshore system, and reduces the complexity of centering the turret connecting module with respect to the receiving portion for inserting it therein.

[0054] Further, at least one or more of the gliding means are preferably located at a part of the inner surface of the receiving portion arranged to coincide with the base portion of the external trunk element. This strategic placement of the gliding means facilitates optimal contact and interaction between the external trunk element and the receiving portion of the weathervaning floating offshore structure (e.g. the gliding means may be configured to have a low frictional coefficient for protecting the inner surface of the receiving portion from damages during the insertion of the turret connecting module).

[0055] In some embodiments, the receiving portion of the weathervaning floating offshore structure may be arranged in a pivot column of the weathervaning floating offshore structure. Preferably, the pivot column may comprise one or more connecting means configured to selectively engage and disengage the pivot column from the rest of the weathervaning floating offshore structure. This selective engagement and disengagement allows for a flexible and adaptable connection, providing the option to detach or attach the pivot column (e.g. together with the turret connecting module) based on specific needs or circumstances, such as for maintenance purposes.

[0056] BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figs. 1A-1 B depict different lateral views of a system 400 according to the second aspect of the invention comprising a turret connecting module 100 according to the first aspect of the invention.

[0058] Fig. 2A shows a detailed view of a turret connecting module 100 according to some embodiments of the invention. Fig. 2B depicts a receiving portion 201 of a weathervaning floating offshore structure 200 configured to receive a turret connecting module 100. Fig. 2C shows a turret connecting module 100 arranged in its operating position O within the receiving portion 201 of Fig. 2B. Figs. 2D-2E depict respective detailed views of the top 11 , 21 and base 12, 22 portions of the external trunk element 1 and the internal shaft element 2 of the turret connecting module 100 of Fig. 2A and 2C.

[0059] Figs. 3A-3B, Fig. 4A-4B and 5A-5B show views of three configurations for an external trunk element 1 compatible with the embodiments of the preceding figures.

[0060] Figs. 6A-6B depict two positions of a turret connecting module 100 connected to a weathervaning floating offshore structure 200 by means of an offset adjustment system 104, which is broadly compatible with the embodiments of the preceding figures.

[0061] Fig. 7A shows detailed view of an exemplary embodiment showing a particular configuration for the turret connecting module 100 compatible with an offset adjustment system 104. Fig. 7B shows a detailed view of Fig. 7A.

[0062] Fig. 8A and 8B show the turret connecting module 100 arranged in two different positions displaced from the operating position O (e.g. due to the action of an offset adjustment system).

[0063] Fig. 9A-9C depict a sequence of steps representing a possible method for connecting a turret connecting module 100 (already inserted into a weathervaning floating offshore structure 200, thereby forming a floating offshore system 400) with a pre-laid mooring system 300.

[0064] Fig. 10A-10B show respective lateral and top views of a floating offshore system 400 according to the invention. Figs. 10C-10D depict two different embodiments in which the pivot column 205 is configured to be selectively engaged with the rest of the weathervaning floating offshore structure 200.

[0065] DETAILED DESCRIPTION OF THE DRAWINGS

[0066] Figs. 1A-1 B show two different schematic lateral views (in which the pre-laid mooring system 300 and part of the floating offshore structure 200 are represented in cross-section views for illustrative purposes) of a floating offshore system 400 according to the second aspect of the invention comprising a turret connecting module 100 according to the first aspect of the invention (see Fig. 1 B) and a weathervaning floating offshore structure 200. The floating offshore system 400 comprises a turret connecting module 100 and a floating weathervaning floating offshore structure 200 having a wind turbine 202. The weathervaning floating offshore structure 200 comprises a receiving portion 201 configured to receive the turret connecting module 100. In Figs. 1A-1 B, the receiving portion 201 is optionally arranged in a pivot column 205 of the weathervaning floating offshore structure 200.

[0067] Fig. 1 B specifically shows the floating offshore system 400 connected to a pre-laid mooring system 300 by means of the turret connecting module 100, such that the weathervaning floating offshore structure 200 is rotatable relative to the pre-laid mooring system 300 about a vertical axis A defined by the turret connecting module 100 (e.g. about a central geometrical vertical axis of the turret connecting module 100), which is arranged in an operative position O. Figs. 1A-1 B represent the pre-laid mooring system 300 specifically configured as a tension leg platform (TLP). The tension leg platform 300 comprises a floating body 301 (e.g. a buoy), which is connected to the seabed S though a mooring system that comprises three tension / leg elements 302 (although only two of them are visible). In other compatible embodiments, the number of tension legs 302 may be different (e.g. three, four, five or more). However, it should be noted that the floating offshore system 400 is also compatible with other pre-laid mooring systems 300 configured differently, such as catenary configurations.

[0068] Fig. 2A depicts a detailed lateral view of a turret connecting module 100 according to the first aspect of the invention, which is compatible with the floating offshore system 400 of Figs. 1A-1 B. The turret connecting module 100 comprises an external trunk element 1 , an internal shaft element 2 and a bearing system 3. The external trunk element 1 comprises a top portion 11 and a base portion 12, wherein the top portion 11 is configured to be attached / coupled to the weathervaning floating offshore structure 200 (e.g. to the receiving portion) to avoid a relative movement (e.g. relative rotation) between the external trunk element 1 and the weathervaning floating offshore structure 200. Fig. 2A shows the external trunk 1 configured as columnar body configured as a tubular element, however the turret connecting module 100 of Fig. 2A is also compatible with any of the configurations described for the external trunk element 1 in this description (e.g. with the configuration in which the external trunk element 1 comprises a functional perimetral area and / or with the configuration in which the external trunk element 1 comprises a first and a second structural elements arranged between a respective intermediate structure, which may comprise a plurality of openings and / or a plurality of elongated structural elements). The external trunk element 1 is configured to receive the internal shaft element 2 in a respective inner receiving space configured to lodge / receive the internal shaft element 2.

[0069] The internal shaft element 2 comprises a top portion 21 and a base portion 22, and is configured to be arranged within the external trunk element 1 (as shown in Fig. 2A). The base portion 22 of the internal shaft element 2 is configured to be coupled to a pre-laid mooring system 300 (as the one shown in Figs. 1A-1 B). In the preferred embodiment shown in Fig. 2A, the internal shaft element 2 is configured as a tubular element, which represents a preferred configuration for the internal shaft element 2 broadly compatible with all the embodiments of the turret connecting module 100.

[0070] The bearing system 3 of the turret connecting module 100 of Fig. 2A includes two bearings: a radial bearing 31 and a top bearing 32 that connect the external trunk element 1 to the internal shaft 2. The connection of the bearings 31 , 32 is configured to allow the external trunk element 1 to weathervane (e.g. to rotate) together with the weathervaning floating offshore structure 200 relative to the internal shaft element 2 and the pre-laid mooring system 300 (i.e. when the turret connecting module 100 is effectively connecting the weathervaning floating offshore structure 200 to a pre-laid mooring system 300, as shown in Fig. 1 B).

[0071] The embodiment of Fig. 2A shows the turret connecting module 100 comprising one radial bearing 31 (also referred to as neck bearing) as part of the bearing system 3, but in other embodiments the bearing system 3 may comprise a plurality of radial bearings 31 (e.g. two or three). The radial bearing 31 comprises an outer interface 311 and an inner interface 312. The outer interface 311 is configured to be in contact with the external trunk element 1 (e.g. with an inner surface of the inner receiving space facing the internal shaft element 2), and the inner interface 312 is configured to be in contact with the internal shaft element 2 (e.g. with an outer surface of the internal shaft element 2). This arrangement of the radial bearing 31 causes this element to be capable to support radial loads (i.e. loads received by the radial bearing 31 in a radial direction with respect to the turret connecting module 100, which is configured to extend longitudinally along an axial direction - which is a vertical direction in the operating position O - and radially along any direction being perpendicular to the axial direction). Fig. 2A represents the preferred option in which the radial bearing 31 may be arranged at the base portion (in other compatible embodiments, the radial bearing 31 may be arranged proximal to said base portion) of the external trunk element and / or the base portion of the internal shaft element. The radial bearing 31 may be configured as a ball or a roller bearing. However, in preferred embodiments, the radial bearing 31 may be configured as a friction bearing (also known as plain bearing) configured to provide sliding contact / motion between the respective surfaces of the external trunk element 1 and the internal shaft element 2. For example, the outer interface 311 may be configured to be attached to the external trunk element 1 and the inner interface 312 may be configured to be in sliding contact with the internal shaft element 2. The bearing system 3 of the turret connecting module 100 shown in Fig. 2A also comprises an optional top bearing 32 (also shown more in detail in Fig. 2D), which comprises a respective outer interface 321 and a respective inner interface 322. The outer interface 321 of the top bearing 32 is configured to be attached on top (i.e. above) of a contact interface 111 of the top portion 11 of the external trunk element 1 , which allows the top bearing 32 to support mainly axial loads. Thus, the outer interface 321 is configured to be supported by the contact interface 111 of the top portion 11 of the external trunk element 1. Therefore, the outer interface 321 of the top bearing 32 is configured such that, when the weathervaning floating offshore structure 200 weathervanes together with the external trunk element 1 about the internal shaft element 2 (when the internal shaft element 2 is rigidly connected to the pre-laid mooring system 300), then the outer interface 321 of the top bearing 32 also rotates / weathervanes together with the external trunk element 1. The inner interface 322 is configured to be attached to the internal shaft element 2. Fig. 2A shows the preferred and optional embodiment in which the inner interface 322 of the top bearing 32 is configured to be attached on top of a contact interface of the top portion of the internal shaft element 2 (this is shown more in detail in Fig. 2D).

[0072] The top bearing 32 may be configured as a slew bearing (e.g. as a bearing comprising a plurality of rolling-elements arranged between two respective ring elements, thereby enabling a rotational movement between the two ring elements, such that the inner and the outer interfaces of the top bearing are each arranged at one of the ring elements). In other compatible embodiments, the top bearing 32 may be configured as a friction bearing.

[0073] The base portion 22 of the internal shaft element 2 of Fig. 2A comprises an optional base connector 23 configured to be selectively coupled to (i.e. coupled to and decoupled from) the pre-laid mooring system 300 (see Fig. 1 B). In Fig. 2A, the base portion 22 of the internal shaft element 2 further comprises an optional coupling connector 24 configured to connect the base connector 23 to the base portion 22 of the internal shaft element 2. The coupling connector 24 may be configured as an elastic coupling connector configured to minimise tilting moments caused by any inclination of the weathervaning floating offshore structure 200 (e.g. due to the water movement) when the base connector 23 is coupled to the pre-laid mooring system 300.

[0074] The top portion 11 of the external trunk element 1 shown in Fig. 2A comprises a contact element 112, which is optionally configured as an integral part of the top portion 11 of the external trunk element 1 . As shown in Fig. 2D, the contact element 112 is configured such that, when the turret connecting module 100 is arranged in the operating position “O”, the contact element 112 contacts on top of a contact interface 203 of the weathervaning floating offshore structure 200. This configuration allows the turret connecting module 100 to be supported / kept in the operating position “O” by the contact interface 203. Fig. 2A shows a contact element 112 configured as a perimetral protruding portion (e.g. as a ring or a flange portion) configured to locally increase a radius of the turret connecting module 100. However, in other compatible embodiments, the contact element 112 may be configured as one or more perimetral protruding portions (e.g. one or more independent protruding portions or flange portions arranged along the perimeter of the top portion 11 of the external trunk element 1). The term “perimetral protruding portion” is equivalent to (i.e. replaceable with)” perimetral protrusion / projection” or to “perimetral protruding element” or to “perimetral projecting element”.

[0075] Although not visible in Fig. 2A, the contact element 112 may further comprise one or more attaching means 1121 (e.g. mechanical connectors, such as a plurality of screws; see Figs. 7A-7B) configured to attach the contact element 112 to the contact interface 203 of the weathervaning floating offshore structure 200, such that the contact element 112 is rigidly attached / connected to the contact interface 203.

[0076] In some embodiments based on the disclosure of Fig. 2A, the contact element 112 may be optionally configured to be removably connected to the top portion 11 of the external trunk element 1 (as depicted in Figs. 7A and 7B). Preferably, the turret connecting module 100 may comprise one or more auxiliary connectors 1122 (e.g. configured as mechanical connectors, such as screws) configured to selectively attach the contact element 112 to the top portion 11 of the external trunk element 1 (i.e. the auxiliary connectors 112 may be configured as removable connectors suitable for providing a selective connection between the contact element 112 and the top portion 11 of the external trunk element 1).

[0077] As shown in Fig. 2D-2E, the external trunk element 1 comprises an outer surface 13 and is preferably configured such that, when the turret connecting module 100 is arranged in the operating position “O”, the outer surface 13 is spaced apart by an assembly gap “G” (measured in a radial direction) with respect to the receiving portion 201 (e.g. with respect to an inner surface 2011 of the receiving portion 201 facing the external trunk element).

[0078] The external trunk element 1 of Fig. 2A further comprises (optional feature) one or more gliding elements 105 (shown in more detail in Fig. 2E) configured to provide an enlarged radius to the external trunk element suitable for providing sliding contact (e.g. with a lower frictional resistance) between the external trunk element 1 and the inner surface 2011 of the receiving portion 201 of the weathervaning floating offshore structure 200 (e.g. while the turret connecting module 100 is inserted within the weathervaning floating offshore structure 200). The gliding elements 105 provide a greater radius / diameter to the part of the turret connecting module 100 where they are arranged, thereby reducing or eliminating the assembly gap “G” between an outer surface 13 of the external trunk element 1 and the inner surface 2011 of the receiving portion 201. The turret connecting module 100 (i.e. the external trunk element 1 of the turret connecting module 100) is configured to contact with the weathervaning floating offshore structure 200 by means of at least (or only by means of) the gliding elements 105 and the top portion 11 (e.g. the contact element 112) of the external trunk 1 , being at least a part of the remaining outer surface 13 of the external trunk 1 arranged at a distance (e.g. a radial distance) from the receiving portion 201 (i.e. from the inner surface 2011 of the receiving portion 201).

[0079] Figs. 2C-2E show that the turret connecting module 100 is arranged within the receiving portion 201 such that an assembly gap “G” is provided between the outer surface 13 of the external trunk 1 and the inner surface 2011 of the receiving portion 201 , wherein this assembly gap “G” is not shown in those areas where the one or more gliding elements 105 are arranged. However, it should be noted that, in some compatible embodiments, the gliding elements 105 may be configured (e.g. dimensioned) to absorb / occupy partially the assembly gap “G” (i.e. to reduce the assembly gap, but without fully eliminating it - i.e. the gliding elements 105 may be configured to be arranged at a radial distance “d” from the inner surface 2011 of the receiving portion 201 , wherein this radial distance “d” is depicted in Fig. 8A) between them and the inner surface 2011 of the receiving portion 201 (e.g. such that the gliding elements 105 only contact the inner surface 2011 upon a movement a relative movement between the turret connecting module 100 and the receiving portion 201 - e.g. when the weathervaning floating offshore structure 200 is moved by the water over which it is floating). Thus, the gliding elements 105 may be configured to absorb at least partially the assembly gap.

[0080] The gliding elements 105 shown in Fig. 2A are arranged at the base portion 12 of the external trunk element 1 coincidentally arranged with respect to the area where the radial bearing 31 is arranged. However, in other compatible embodiments additional gliding elements 105 may be arranged in other locations of the external trunk element 1.

[0081] Preferably, the one or more gliding elements 105 may be configured to be inflatable (e.g. being configured as pads configured to vary its volume by regulating the presence of a liquid or gaseous fluid within the pads) and / or configured to be at least partially compressible and / or elastic. The gliding elements 105 may be configured to (i.e. adapted to) operatively interact with respective gliding means 204 (as those shown in Figs 8A-8B) of the receiving portion 201 of the weathervaning floating offshore structure 200. Fig. 2B represents a weathervaning floating offshore structure 200 (which may comprise one or more wind turbines) comprising a receiving portion 201 configured to receive a turret connecting module 100 as the one shown in Fig. 2A. The receiving portion 201 is shown as comprising an inner surface 2011 and a contact interface 203. Fig. 2C shows a floating offshore system 400 resulting from inserting the turret connecting module 100 of Fig. 2A into the receiving portion 201 of the weathervaning floating offshore structure 200. In Fig. 2C the turret connecting module 100 is shown arranged in the operating position “O”. Figs. 2D and 2E show respective detailed views of Fig. 2C.

[0082] Each pair of Figs. 3A-3B, Figs. 4A-4B and Figs. 5A-5B shows a respective configuration of an external trunk element 1 compatible with any of the preceding embodiments.

[0083] Figs. 3A-3B and 4A-4B show an external trunk element 1 comprising a functional perimetral area 113 arranged in the top portion 11 of the external trunk element 1 , wherein said functional perimetral area 113 comprises a plurality of elongated apertures 1131. The plurality of apertures 1131 may be distributed in one or more rows of elongated apertures horizontally distributed over the functional perimetral area 113 (Figs. 3A-3B show a preferred embodiment comprising three rows); and / or may be distributed in one or more rows of elongated apertures 1131 distributed obliquely over the functional perimetral area 113 (Figs. 4A-4B show a preferred embodiment comprising one row). The wide block identified with the reference sign 12 represents the base portion 12 of the external trunk element in the optional configuration in which the gliding elements 105 are arranged providing a locally widened diameter for contacting with the inner surface 2011 of the receiving portion 201.

[0084] The functional perimetral area 113 shown in Figs. 3A-3B is arranged at a distance from the end part (i.e. the highest part) of the external trunk element 1 of about 40% of the diameter of the external trunk element 1 , while the functional perimetral area of Figs. 4A-4B is arranged at a distance from said end part of about 35% of the diameter. However, it should be noted that both configurations are compatible with a distance being in the range 20% to 150% of the diameter, preferably in the range 30% to 80%, more preferably 40 to 60%.

[0085] Further, the functional perimetral area 113 shown in Figs. 3A-3B has a length (i.e. a vertical length or height distance) of about 67% of the diameter of the external trunk element 1 , while the functional perimetral area 113 of Figs. 4A-4B has a length of about 38% the diameter of the external trunk element 1 . However, it should be noted that both configurations are compatible with a length being in the range 10% to 150% of the diameter, preferably in the range 20% to 90%, more preferably 30% to 70%. Figs. 5A-5B show an optional configuration for the external trunk element 1 in which the external trunk element 1 of Figs. 5A-5B comprises a first structural element 101 arranged in the top portion 11 of the external trunk element 1 , a second structural element 102 arranged in the base portion of the external trunk element 1 , and an intermediate structure 103 configured to structurally connect the first structural element 101 to the second structural element 102. The first structural element 101 is configured to be connected to the outer interface 321 of the top bearing 32, and the second structural element 102 is configured to be connected to the outer interface 311 of the radial bearing 31. The intermediate structure 103 of Figs. 5A-5B comprises a plurality of openings 1031 and a plurality of elongated structural elements 1032 (wherein the elongated structural elements 1032 are arranged such that the plurality of openings 1031 is defined by a separation space between the elongated structural elements 1032), such as structural rods 1032. The first 101 and / or second structural element 102 may be configured as respective tubular portions (e.g. as a cylinder / ring or as a regular prism with regular polygon bases). Fig. 5A shows the preferred configuration in which the second structural element 102 is arranged within another element (shown as a rectangular element) that represents the gliding elements 105 (preferably these elements are arranged in an area surrounding the position of the radial bearing 31 , as shown in Fig. 2A).

[0086] The embodiment of Figs. 5A-5B is compatible with the functional perimetral area 113 of Figs. 3A- 3B and 4A-4B and is also combinable with the embodiments of any of the preceding figures.

[0087] Figs. 6A-6B show an embodiment of the floating offshore system 400 compatible with the embodiment of Figs. 1 A-1 B, the floating offshore system 400 comprising: a weathervaning floating offshore structure 200 (which may be according to the any of the aforementioned configurations described for this structure), preferably comprising at least one wind turbine (not shown); and a turret connecting module 100 according to any of the embodiments of the first aspect of the invention. The floating offshore system 400 shown in Figs. 6A-6B further comprises an offset adjustment system 104 configured to operatively connect the turret connecting module 100 and the weathervaning floating offshore structure 200, and further configured to selectively cause a vertical displacement of the turret connecting module 100 with respect to the operating position “O” relative to the weathervaning floating offshore structure 200. The offset adjustment system 104 may optionally be part of the turret connecting module 100 and / or part of the weathervaning floating offshore structure 200.

[0088] The offset adjustment system 104, which is schematically represented in Figs. 6A-6B, may comprise one or more mechanical means configured to provide the ability to cause a vertical displacement of the turret connecting module 100. The mechanical means may include, but are not limited to, components such as one or more pistons (Figs. 6A-6B represent the offset adjustment system 104 as comprising two pistons), and / or one or more winches (e.g. configured to connect the turret connecting module 100 to the weathervaning floating offshore structure 200), and / or one or more strand jacks (e.g. configured to connect the turret connecting module 100 to the weathervaning floating offshore structure 200). The mechanical means / elements may be part of the turret connecting module 100, although in some embodiments, some or all of the mechanical means may be part of the weathervaning floating offshore structure 200.

[0089] Fig. 6A shows the turret connecting module 100 arranged in the same operating position “O” previously shown in Fig. 2C, while Fig. 6B shows the turret connecting module 100 retracted within the receiving portion 201 of the weathervaning floating offshore structure 200. Accordingly, in the embodiment of Fig. 6B the offset adjustment system 104 is configured to cause the vertical displacement of the turret connecting module 100 to selectively elevate the position of the turret connecting module 100 relative to the weathervaning floating offshore structure 200 from the operating position upwards (e.g. to reach a retracted position, as shown in Fig. 6B). Preferably, this displacement (e.g. upwards, preferably until reaching the retracted position) may be configured to reduce or eliminate a projection of the turret connecting module 100 from a bottom part of the receiving portion 201 of the weathervaning floating offshore structure 200. This configuration is especially advantageous when the turret connecting module 100 is inserted into a weathervaning floating offshore structure 200 that has to be transported to be arranged / deployed in a particular location (e.g. where a pre-laid mooring structure / system 300 has been previously arranged). Figs. 6A and 6B show an optional top hatch 207 arranged in the weathervaning floating offshore structure 200 (e.g. in a top part of the pivot column 205) which is configured to allow a vertical insertion of the turret connecting module 100 within the receiving portion 201.

[0090] Alternatively or additionally to the displacement upwards, the offset adjustment system 104 may be configured to cause the vertical displacement of the turret connecting module 100 to selectively lower the position of the turret connection module 100 with respect to the weathervaning floating offshore structure 200 from the operating position downwards (e.g. to reach an extended position). Preferably, this displacement (e.g. downwards, preferably until reaching the extended position) may increase a projection of the turret connection module 100 from a bottom part of the receiving portion 201 of the weathervaning floating offshore structure 200. This configuration (which is shown, for example, in Figs. 8B and 9B) is generally compatible with any embodiment of the turret connecting module 100 having a contact element 112 configured to be removably connected to the top portion 11 of the external trunk element 1 . Further, this displacement downwards enables the possibility of connecting the floating offshore system 400 to a pre-laid mooring system 300 as shown in the sequence depicted in Figs. 9A-9C. More particularly, the fact of having the turret connecting module 100 arranged below the operating position “O” causes the base portion 12 of the external trunk 1 and / or the base portion 22 of the internal shaft element 2 to protrude from the receiving portion, such that a lower part of the turret connecting module 100 becomes movable in a radial direction (since there is there is no contact with the receiving portion 201 , which is advantageous for aligning the turret connecting module 100 for connecting it with the pre-laid mooring system 300.

[0091] Although not shown in the figures, the offset adjustment system 104 may be further configured to decouple the external trunk element 1 from the weathervaning floating offshore structure 200 for allowing a relative rotation of the turret connecting module 100 with respect to the weathervaning floating offshore structure 200. Thus, this decoupling provides / enables the possibility of rotating the turret connecting module 100 to modify the part of the bearing system 3 (e.g. of the radial bearing 31 and / or of the top bearing 32) that is receiving a higher concentration of mechanical stresses, thereby wearing the most. In this regard, it should be noted that a rotation of the turret connecting module 100 implies that the bearing system 3 is rotated together with the turret connecting module 100. In some embodiments, the offset adjustment system 104 may further comprise guiding elements configured to enable and guide rotational movement of the turret connecting module 100 when the turret connecting module 100 is vertically displaced from is operating position “O” due to the action of the offset adjustment system 104. The guiding elements may comprise, for example, wheels and / or guides arranged in the connection between the external trunk element 1 and the receiving portion 201 .

[0092] Further, although not shown in the figures, the floating offshore system 400 may also comprise a drive system (e.g. comprising one or more motors or actuators configured to rotate the turret connecting module 100 within the weathervaning floating offshore 200 structure about a vertical axis A (e.g. a central geometrical vertical axis A of the turret connecting module 100) when the turret connecting module 100 is vertically displaced from the operating position “O” due to the action of the offset adjustment system 104. The drive system may be configured to be independent from the offset adjustment system 104 or may be configured to be part of the weathervaning floating offshore structure 200.

[0093] Fig. 7A shows the same configuration shown in Figs. 6A, but in this case having a contact element 112 configured to be removably connected to the top portion 11 of the external trunk element 1. The turret connecting module 100 comprises one or more auxiliary connectors 1122 (e.g. configured as mechanical connectors, such as one or more screws) configured to selectively attach the contact element 112 to the top portion 11 of the external trunk element 1. In this configuration, the contact element 112 may further comprise one or more attaching means 1121 configured to attach the contact element 112 to the contact interface 203 of the weathervaning floating offshore structure 200, such that the contact element 112 is rigidly attached / connected to the contact interface 203. Fig. 7B provides an enlarged view of a part of Fig. 7A marked with a rectangle.

[0094] Fig. 8A and 8B depict a particular embodiment of the system 400 in which the turret connecting module 100 comprises one or more gliding elements 105 (which may be configured according to any of the options described for Fig. 2A) and the weathervaning floating offshore structure 200 comprises respective gliding means 204 arranged in an inner surface 2011 (shown in Fig. 2B) of the receiving portion 201 , wherein the gliding elements 105 and the gliding means 204 are configured to (i.e. adapted to) operatively interact with each other for centering the turret connecting module 100 within the receiving portion 201 , e.g. under sliding contact between them. It should be noted that the invention is compatible with embodiments optionally comprising one or more gliding elements 105 and / or one or more gliding means 204.

[0095] The configuration shown in Figs. 8A and 8B is broadly compatible with any of the preceding embodiments (e.g. it is not restricted to those embodiments in which the offset adjustment system 104 is configured to move the turret connecting module 100 downwards as shown in Fig. 8A). In preferred embodiments, the gliding means 204 may be arranged in a lower part of the receiving portion 201 to contact with gliding elements 105 arranged coinciding with the position of the radial bearing 31. Preferably, the gliding elements 105 may be configured to have a variable thickness along a vertical direction, for example, such that a central portion 105a with a greater thickness (i.e. said central portion 105a providing a greater radius to the turret connecting module 100) is arranged between two portions 105b (e.g. an upper portion 105b) and 105c (e.g. a lower portion 105c) having a lower thickness (preferably configured as respective planar or curved slope portions). Optionally, the same configuration may be replicated in the gliding means 204 of the weathervaning floating offshore structure 200, as shown in Fig. 8B, wherein the gliding means 204 are shown as comprising a central portion 204a arranged between two respective portions 204b and 204c having a lower thickness

[0096] It should be noted that in some embodiments, the gliding elements 105 may be configured to have a variable thickness along a vertical direction as above described even when the system 400 does not comprise any gliding means 204.

[0097] Further, Fig. 8A shows the optional configuration in which the one or more gliding elements 105 are configured to be arranged in contact with the external trunk 1 (e.g. with the outer surface 13 of the external trunk 1 and at a radial distance “d” from the inner surface 2011 of the receiving portion 201 , such that the gliding elements 105 are configured to contact the inner surface 2011 upon a relative movement in a radial direction between the turret connecting module 100 and the receiving portion 201 (e.g. when the turret connecting module 100 is arranged in the operating position “O” and / or when the turret connecting module 100 is moved away from the operating position “O”).

[0098] Figs. 9A-9B show a sequence of steps for connecting the floating offshore system 400 to a pre-laid mooring system 300 by means of a turret connecting module 100 that have been moved downwards (e.g. until reaching an extended position) by the offset adjustment system 104. This configuration has the advantage of allowing an easy connection of the turret connecting module 100 to the pre-laid mooring system 300 (since the fact of having the turret connecting module 100 arranged below the operating position “O” causes the base portion 12 of the external trunk 1 and / or the base portion 22 of the internal shaft element 2 to protrude from the receiving portion 201 , such that a lower part of the turret connecting module 100 becomes movable in a radial direction, thereby allowing the turret connecting module 100 to be easily aligned to be connected to the pre-laid mooring system 300; this is also depicted in Fig. 8B), without requiring the weathervaning floating offshore structure 200 to reduce its floatability / buoyancy for allowing the connection. Fig. 9A shows the turret connecting module 100 in an extended position such that a functional block comprising the radial bearing 31 and the gliding element 105 is arranged outside from the receiving portion 201 , which provides the turret connecting module 100 with the ability to have an adjustment movement relative to the weathervaning floating structure 200. Fig. 9B shows how the turret connecting module 100 is aligned with a respective connector of the pre-laid mooring system 300 and is connected thereto. Finally, Fig. 9C depicts how the turret connecting module 100 is forced to be moved upwards (by the offset adjustment system 104, which is not visible in the figure) to reach its operating position “O”, thereby reducing the distance between the weathervaning floating offshore structure 200 and the pre-laid mooring system 300.

[0099] Fig. 10A-10B show a schematic representation of an embodiment of a floating offshore structure 200 in which a turret connecting module 100 according to any of the preceding embodiments is configured to be inserted into a receiving portion 201 (which may be configured as described for any of the aforementioned embodiments) of a weathervaning floating offshore structure 200, wherein the receiving portion 201 of the weathervaning floating offshore structure 200 is arranged in a pivot column 205 of the weathervaning floating offshore structure 200 (so far this may also be compatible with the preceding embodiments). However, Figs. 10A-10B depict the optional configuration in which the pivot column 205 is configured to be detachable from the rest of the weathervaning floating offshore structure 200. For this purpose, the pivot column 205 comprises one or more connecting means 206 configured to selectively engage and disengage the pivot column 205 from the rest of the weathervaning floating offshore structure 200.

Claims

CLAIMS1. A turret connecting module (100) for being selectively inserted into a receiving portion (201) of a weathervaning floating offshore structure (200) of a wind turbine (202) for connecting said weathervaning floating offshore structure (200) to a pre-laid mooring system (300), the turret connecting module (100) comprising: an external trunk element (1) comprising a top portion (11) and a base portion (12), the top portion (11) being configured to be attached to the weathervaning floating offshore structure (200); an internal shaft element (2) configured to be arranged within the external trunk element (1), the internal shaft element (2) comprising a top portion (21) and a base portion (22), said base portion (22) being configured to be coupled to the pre-laid mooring system (300); and a bearing system (3) comprising at least one bearing (31 , 32) configured to connect the external trunk element (1) to the internal shaft element (2) such that, the external trunk element (1) is allowed to weathervane together with the weathervaning floating offshore structure (200) relative to the internal shaft element (2) and the pre-laid mooring system (300); wherein the turret connecting module (100) is configured to be vertically arranged in an operating position (O) within the receiving portion (201) of the weathervaning floating offshore structure (200) for connecting the weathervaning floating offshore structure (200) to the pre-laid mooring system (300).

2. The turret connecting module (100) of claim 1 , wherein the at least one bearing (31 , 32) of the bearing system (3) comprises a radial bearing (31) comprising an outer interface (311) and an inner interface (312), wherein the outer interface (311) is configured to be in contact with the external trunk element (1), and wherein the inner interface (312) is configured to be in contact with the internal shaft element (2); wherein preferably the radial bearing (31) is arranged at, or proximal to, the base portion (12) of the external trunk (1) and / or of the base portion (22) of the internal shaft element (2).

3. The turret connecting module (100) of any of the preceding claims, wherein the at least one bearing (31 , 32) of the bearing system (3) comprises a top bearing (32) comprising an outer interface (321) and an inner interface (322), wherein the outer interface (321) is configured to be attached on top of a contact interface (111) of the top portion (11) of the external trunk element (1), wherein the inner interface (322) is configured to be in contact with the internal shaft element (2).

4. The turret connecting module (100) of claims 2 and 3, wherein the external trunk element (1) comprises a first structural element (101) arranged at the top portion (11) of the external trunk(I), a second structural element (102) arranged at the base portion (12) of the external trunk (1), and an intermediate structure (103) configured to structurally connect the first structural element (101) to the second structural element (102); wherein the first structural element (101) is configured to be connected to the outer interface (321) of the top bearing (32) and wherein the second structural element (102) is configured to be connected to the outer interface (311) of the radial bearing (31); wherein preferably: the intermediate structure (103) comprises a plurality of openings (1031); and / or the intermediate structure (103) comprises a plurality of elongated structural elements (1032), such as structural rods.

5. The turret connecting module (100) according to any of the preceding claims, wherein the external trunk element (1) further comprises a functional perimetral area (113) arranged in the top portion (11) of the external trunk element (1), wherein said functional perimetral area (113) comprises a plurality of elongated apertures (1131); wherein preferably the plurality of elongated apertures (1131) comprises: one or more rows of elongated apertures (1131) horizontally distributed over the functional perimetral area (113); and / or one or more rows of elongated apertures (1131) distributed obliquely over the functional perimetral area (113).

6. The turret connecting module (100) of any of the preceding claims, wherein the base portion (22) of the internal shaft element (2) comprises a base connector (23) configured to be selectively coupled to the pre-laid mooring system (300), wherein preferably the base portion (22) of the internal shaft element (2) further comprises a coupling connector (24) configured to connect the base connector (23) to the base portion (22) of the internal shaft element (2), wherein more preferably the coupling connector (24) is an elastic coupling connector configured to absorb radial loads when the base connector (23) is coupled to the pre-laid mooring system (300).

7. The turret connecting module (100) of any of the preceding claims, wherein the top portion(I I) of the external trunk element (1) comprises a contact element (112) configured such that, when the turret connecting module (100) is arranged in the operating position (O), the contact element (112) contacts on top of a contact interface (203) of the weathervaning floating offshore structure (200), thereby allowing the turret connecting module (100) to be supported in the operating position (O);wherein preferably: the contact element (112) is configured as one or more perimetral protruding portions configured to locally increase a radius of the turret connecting module (100); and / or the contact element (112) comprises one or more attaching means (1121) configured to attach the contact element (112) to the contact interface (203) of the weathervaning floating offshore structure (200).

8. The turret connecting module (100) of claim 7, wherein the contact element (112) is configured to be removably connected to the top portion (11) of the external trunk element (1); wherein preferably the turret connecting module (100) comprises one or more auxiliary connectors (1122) configured to selectively attach the contact element (112) to the top portion (11) of the external trunk (1).

9. The turret connecting module (100) of any of the preceding claims, wherein the external trunk element (1) further comprises one or more gliding elements (105) arranged in an outer surface (13) of the external trunk element (1) and configured to provide an enlarged radius to the external trunk element (1); wherein preferably: the gliding elements (105) are further configured to be selectively inflatable and / or to be at least partially compressible and / or elastic for absorbing tolerance variations and potential radial loads between the external trunk element (1) and an inner surface (2011) of the receiving portion (201) of the weathervaning floating offshore structure (200), when the turret connecting module (100) is inserted into the receiving portion (201) of the weathervaning floating offshore structure (200); and / or at least one or more of the gliding elements (105) are arranged at the base portion (12) of the external trunk element (1).

10. The turret connecting module (100) of claim 9, wherein: the one or more gliding elements (105) are configured to have a variable thickness along a vertical direction, the one or more gliding elements (105) preferably comprising a central portion (105a) arranged between an upper portion (105b) and a lower portion (105c), the central portion (105a) having a thickness being greater than a thickness of the upper (105b) and the lower (105c) portions, wherein more preferably the upper (105b) and lower (105c) portions are configured as planar or curved slope portions; and / or the one or more gliding elements (105) are configured such that, when the turret connecting module (100) is inserted into the receiving portion (201) of the weathervaning floating offshorestructure (200), the one or more gliding elements (105) are arranged in contact with the external trunk (1) and at a radial distance (d) from an inner surface (2011) of the receiving portion (201), such that the gliding elements (105) are configured to contact the inner surface (2011) upon a relative movement in a radial direction between the turret connecting module (100) and the receiving portion (201).

11. A floating offshore system (400) comprising: a weathervaning floating offshore structure (200) preferably comprising at least one wind turbine (202); and a turret connecting module (100) according to any of the preceding claims, the turret connecting module (100) being configured to be inserted in an operating position into a receiving portion (201) of the weathervaning floating offshore structure (200) for connecting the weathervaning floating offshore structure (200) to a pre-laid mooring system (300), preferably configured as a tension-leg platform TLP, such that the weathervaning floating offshore structure(200) is rotatable relative to the pre-laid mooring system (300) to align the wind turbine to an incoming wind; wherein preferably the turret connecting module (100) is configured to be inserted within the receiving portion (201) such that an assembly gap (G) in a radial direction is provided between an outer surface (13) of the external trunk element (1) and an inner surface (2011) of the receiving portion (201).

12. The floating offshore system (400) according to claim 11 , wherein the receiving portion(201) of the weathervaning floating offshore structure (200) is configured to house the turret connecting module (100) such that the turret connecting module (100) is transportable together with the weathervaning floating offshore structure (200) when disconnected from the pre-laid mooring system (300); wherein preferably: the receiving portion (201) comprises a lower opening configured to allow the base portion (22) of the internal shaft element (2) of the turret connecting module (100) to be coupled to the prelaid mooring system (300); and / or the receiving portion (201) comprises an upper opening configured to receive the turret connecting module (100) by downwardly vertical insertion.

13. The floating offshore system (400) of claim 11 or 12, further comprising an offset adjustment system (104) configured to operatively connect the turret connecting module (100) and the weathervaning floating offshore structure (200), the offset adjustment system (104) being furtherconfigured to selectively cause a vertical displacement of the turret connecting module (100) with respect to the operating position (O) relative to the weathervaning floating offshore structure (200); wherein preferably the offset adjustment system (104) is part of the turret connecting module (100) and / or part of the weathervaning floating offshore structure (200).

14. The floating offshore system (400) of claim 13, wherein the offset adjustment system (104) is configured to cause the vertical displacement of the turret connecting module (100) with respect to the operating position (O) to selectively elevate the position of the turret connecting module (100) from the operating position (O) upwards, preferably such that a projection of the turret connecting module (100) from a bottom part of the receiving portion (201) of the weathervaning floating offshore structure (200) is reduced or eliminated; and / or to selectively lower the position of the turret connection module (100) from the operating position (O) downwards, preferably such that a projection of the turret connecting module (100) from a bottom part of the receiving portion (201) of the weathervaning floating offshore structure (200) is increased, more preferably such that the base portion (12) of the external trunk (1) and / or the base portion (22) of the internal shaft element (2) completely protrude from a bottom part of the receiving portion (201) of the weathervaning floating offshore structure (200).

15. The floating offshore system (400) of claim 13 or 14, wherein the offset adjustment system (104) is further configured to decouple the external trunk element (1) from the weathervaning floating offshore structure (200) for allowing a relative rotation of the turret connecting module (100) with respect to the weathervaning floating offshore structure (200); wherein preferably the floating offshore system (400) further comprises a drive system (106) configured to rotate the turret connecting module (100) within the weathervaning floating offshore structure (200) about a vertical axis when the turret connecting module is (100) vertically displaced from the operating position (O) due to the action of the offset adjustment system (104).

16. The floating offshore system (400) of any of claims 11 to 15, further comprising one or more gliding means (204) arranged in an inner surface (2011) of the receiving portion (201), said one or more gliding means (204) being configured to provide sliding contact between the inner surface (2011) of the receiving portion (201) of the weathervaning floating offshore structure (200) and the external trunk element (1); wherein preferably:the gliding means (204) are further configured to be selectively inflatable and / or to be at least partially compressible and / or elastic for absorbing tolerance variations and potential radial loads between the external trunk element (1) and the inner surface (2011) of the receiving portion (201 ; and / or at least one or more of the gliding means (204) are located at a part of the inner surface(2011) of the receiving portion (201) arranged to coincide with the base portion (12) of the external trunk element (1).

17. The floating offshore system (400) of any of claims 11 to 16, wherein the receiving portion (201) of the weathervaning floating offshore structure (200) is arranged in a pivot column (205) of the weathervaning floating offshore structure (200); wherein preferably the pivot column (205) comprises one or more connecting means (206) configured to selectively engage and disengage the pivot column (205) from the rest of the weathervaning floating offshore structure (200).

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