Patent Application
20240059379
The present disclosure relates to mooring buoys for energy collection systems. More particularly, the present disclosure relates to mooring buoys manufactured of particular materials. Still more particularly, the present disclosure relates to manufacturing methods for mooring buoys made of particular materials.
The background description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventor, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.
Single point mooring systems have frequently been used in offshore locations for the loading and unloading of hydrocarbons or other flowable cargos into or out of marine vessels such as tankers, Floating Production Storage and Offloading (FPSO) systems, barges and the like. Offshore wind collection systems also utilize mooring systems to secure them to the seabed. These mooring systems commonly use buoys to support mooring lines and hold particular portions of the mooring lines above the sea floor and closer to the surface. In many cases, these buoys may be made from steel materials and able to be used in deep water and arctic environments to withstand the harsh conditions. The steel buoys may have a smooth surface for open sea and/or deep-water deployment to withstand the external pressure of a submerged device. Internal stiffener rings are used to help to withstand the external pressure. The stiffener rings are welded to the inside of the buoys.
The following presents a simplified summary of one or more embodiments of the present disclosure in order to provide a basic understanding of such embodiments. This summary is not an extensive overview of all contemplated embodiments and is intended to neither identify key or critical elements of all embodiments, nor delineate the scope of any or all embodiments. Examples involve a mooring buoy comprising a cylindrical structural shell. The cylindrical structural shell comprises fiberglass reinforced plastic (FRP) and has a first open end and an opposite second open end. A plurality of annular stiffeners are bonded to an inside of the cylindrical structural shell. A first endcap is disposed on the first open end of the cylindrical structural shell. The first endcap is configured to substantially cover the first open end. A second endcap is disposed on the second open end of the cylindrical structural shell. The second endcap is configured to substantially cover the second open end. At least one cylindrical attachment mechanism is coupled to an outside of the cylindrical structural shell. The cylindrical attachment mechanism is configured to attach mooring lines to the cylindrical structural shell.
A method of manufacturing a fiberglass reinforced plastic (FRP) mooring buoy comprises placing a plurality of removable annular spacers and at least one stationary annular stiffener on a mandrel. Each pair of removable annular spacers of the plurality of removable annular spacers are configured to have one of the at least one stationary annular stiffener disposed therebetween. An endcap is placed on first end of the mandrel. The endcap is disposed proximate one of the removable annular spacers. A hollow cylindrical structural shell is formed on at least the plurality of stationary annular stiffeners. The mandrel is removed from the at least one stationary annular stiffener and the plurality of removable annular spacers leaving an open end and an opposing end closed by the endcap. At least one removable annular spacer of the plurality of removable annular spacers is collapsed. The plurality of removable annular spacers are removed from the cylindrical structural shell.
An example moorage system, comprises a buoy configured to be attached to one or more of a boat and an offshore floating wind tower. A mooring buoy is coupled to the buoy, the mooring buoy comprising. The mooring buoy comprises a cylindrical structural shell comprising fiberglass reinforced plastic (FRP). The cylindrical structural shell has a first open end and an opposite second open end. A plurality of annular stiffeners are bonded to an inside of the cylindrical structural shell. A first endcap is disposed on the first open end of the cylindrical structural shell. The first endcap is configured to substantially cover the first open end. A second endcap is disposed on the second open end of the cylindrical structural shell. The second endcap is configured to substantially cover the second open end. At least one cylindrical attachment mechanism is coupled to an outside of the cylindrical structural shell. The cylindrical attachment mechanism is configured to attach mooring lines to the cylindrical structural shell. At least one mooring line configured to attach the mooring buoy to the buoy and to a sea floor.
While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter that is regarded as forming the various embodiments of the present disclosure, it is believed that the invention will be better understood from the following description taken in conjunction with the accompanying Figures, in which:
Offshore floating wind tower or other floating systems may be secured to the seabed using a mooring system. These mooring systems utilize buoys like those described herein. Steel buoys may be subject to corrosion and steel materials resistant to corrosion can be expensive and/or cost prohibitive. Examples described herein use materials not subject to corrosion. For example, buoys described herein may comprise Fiberglass Reinforced Plastic (FRP). The stiffener rings for the FRP buoys may be bonded to the shell instead of welded allowing for a significant reduction in manufacturing time by avoiding manual or automated welding. According to various configurations, the stiffener rings are laminated to the inside of the body of the mooring buoy. In some cases, the stiffener rings are integrated into the buoy during manufacture of the shell.
In this example, a cylindrical structural shell 210 has a metal band, a first attachment mechanism 230 and a second attachment mechanism 240 secured thereto. Each attachment mechanism 230, 240 may include a reinforcing ribbon or band that extends around the peripheral surface of the shell 210 and has protrusions that extend out from the attachment mechanism. For example, the first attachment mechanism 230 may have a first protrusion 232 with a first hole 234 and a second protrusion 236 having a second hole 238.
According to various examples, the first protrusion 232 is configured to be a lifting lug for transporting and/or positioning the buoy, for example. For example, the first protrusion 232 may be configured for substantially vertical load lifting. The second protrusion 236 may be configured to attach to one or more mooring lines and/or allow for travel along the mooring line.
The distance, DP1, between the first holes disposed on the first attachment mechanisms is in a range of about 5 feet to about 15 feet or in a range of about 8 feet to about 10 feet. The distance, DP2, between the second holes disposed on the second attachment mechanisms is in a range of about 5 feet to about 15 feet or in a range of about 8 feet to about 12 feet. One or both of the first hole and the second hole may be configured to accept a mooring line for securing the buoy to the power collection device or other floating element and/or the seabed.
The stiffening rings may be generally annularly shaped elements. In some cases, the stiffening rings may have a generally triangular cross-section with a base and a decreasing linear taper as they protrude toward the center of the structural shell and to an apex of the triangular cross-section. While a triangular cross-section has been described, a rectangular, square, or other cross-section may also be provided. In one or more examples, the stiffening rings may be spaced along the length of the shell 210 by a distance, DS, between adjacent stiffening rings. In one or more examples, the distance DS may be substantially identical for all of the stiffening rings. For example, DS may be in a range of about 2 feet to about 6 feet or in a range of about 3 feet to about 4 feet. In some cases, the distance between adjacent stiffening rings may vary along the length of the buoy. For example, in some cases, a tighter spacing of stiffening rings may be provided at or near the attachment mechanisms where loading of the shell may be less uniform.
In some cases, the stiffening rings may not extend along the entire periphery of the structural shell. Also, while
Each stiffener has a first end 480 adjacent to an inside surface of the cylindrical structural shell and an opposing end 490 away from the inside of the cylindrical structural shell. The first end 480 has a first width, W1, and the second end has a second width, W2. According to various configurations, W1 is different than W2. In the example shown in
A metal band 470 is configured to be coupled to the first protrusion 232 and the second protrusion 236. According to various examples, the metal band 270 is continuous around the structural shell 232. In some cases, the metal band 270 is not continuous around the structural shell 210. For example, the metal band may be a bolted clamshell to facilitate installation and/or removal. An FRP bumper stop 460 is configured to fix the metal band 270 at a particular location along the structural shell 210.
According to various configurations, at least some of the removable spacers 630 have one or more notches 650 that allow them to collapse to be removed from in between the stiffening rings after the shell is formed and the mandrel is removed.
A cylindrical structural shell 210 is formed over the alternating stiffening rings 620 and removable spacers 630. The structural shell 210 is formed and bonded 530 to at least the stiffening rings 620 using a filament winding process, for example. The cylindrical structural shell 210 may be configured to substantially cover one or both of the removable spacers 630 placed on either end of the mandrel.
According to various configurations, an attachment mechanism 910 is coupled to the outside of the cylindrical structural shell. The attachment mechanism 910 may comprise metal. For example, the attachment mechanism 910 may comprise steel. The attachment mechanism has a first protrusion 920 on a first side and a second protrusion 930 on an opposing second side of the attachment mechanism 910. The first protrusion 920 may be a lift lug, for example. The second protrusion 930 may be a cable lug.
While the example shown in
The mandrel 610 is removed 540 from the stiffening rings 620 and the removable spacers 630 leaving an open end and an opposing end closed by the endcap as shown by
In some configurations, a first buoy structure 1310 and a second buoy structure 1320 are formed and the open ends of the respective buoy structures are bonded together to create the mooring buoy as shown in
As used herein, the terms “substantially” or “generally” refer to the complete or nearly complete extent or degree of an action, characteristic, property, state, structure, item, or result. For example, an object that is “substantially” or “generally” enclosed would mean that the object is either completely enclosed or nearly completely enclosed. The exact allowable degree of deviation from absolute completeness may in some cases depend on the specific context. However, generally speaking, the nearness of completion will be so as to have generally the same overall result as if absolute and total completion were obtained. The use of “substantially” or “generally” is equally applicable when used in a negative connotation to refer to the complete or near complete lack of an action, characteristic, property, state, structure, item, or result. For example, an element, combination, embodiment, or composition that is “substantially free of” or “generally free of” an element may still actually contain such element as long as there is generally no significant effect thereof.
To aid the Patent Office and any readers of any patent issued on this application in interpreting the claims appended hereto, applicants wish to note that they do not intend any of the appended claims or claim elements to invoke 35 U.S.C. § 112(f) unless the words “means for” or “step for” are explicitly used in the particular claim.
Additionally, as used herein, the phrase “at least one of [X] and [Y],” where X and Y are different components that may be included in an embodiment of the present disclosure, means that the embodiment could include component X without component Y, the embodiment could include the component Y without component X, or the embodiment could include both components X and Y. Similarly, when used with respect to three or more components, such as “at least one of [X], [Y], and [Z],” the phrase means that the embodiment could include any one of the three or more components, any combination or sub-combination of any of the components, or all of the components.
In the foregoing description various embodiments of the present disclosure have been presented for the purpose of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obvious modifications or variations are possible in light of the above teachings. The various embodiments were chosen and described to provide the best illustration of the principals of the disclosure and their practical application, and to enable one of ordinary skill in the art to utilize the various embodiments with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the present disclosure as determined by the appended claims when interpreted in accordance with the breadth they are fairly, legally, and equitably entitled.
