Patent Application
20130087650
Noon The invention is generally related to the storage of flexible product such as flexible pipe and cable and, more particularly, to the use of multiple reels for storage of such flexible product on a vessel and for laying the product on the sea floor.
For the laying of product such as flexible pipe or cable on the sea floor, the product has been wound onto a large reel on a vessel. The vessel then sails to the location for laying the product and slowly moves along the intended sea floor path for laying the product as the reel is rotated to release the product. Rotation of the reel requires a drive arrangement capable of handling the weight of the reel and the product and also maintaining a certain minimum amount of tension on the product during laying operations.
In some instances, such as for flexible product of cable or flexible pipe, multiple smaller reels have been loaded with product at the point of manufacture, transported on the smaller reels, and stored on the deck of the vessel.
One disadvantage of using multiple small reels is that they occupy a large amount of deck space on a vessel where efficient use of deck space is important. Another disadvantage is that multiple lifts are required to move the reels onto and off of the vessel as well as to move the reels between the storage positions on deck and the laying position on deck. A disadvantage of using large reels for flexible pipe is that the amount of pipe that can be wound onto the reel may be limited to prevent crushing of the flexible pipe on the reel due to the weight of the flexible pipe wound upon itself. Another problem with large reels is they cannot be easily transported due to the complex logistics of finding equipment capable of lifting larger reels and transporting these reels in the public way.
Therefore, it can be seen there is a need for an improved arrangement for storing flexible product on vessels before and during laying operations offshore.
The present invention addresses the above need and is directed to a reel arrangement on a vessel for storage and laying of flexible product from the vessel offshore that solves the shortcomings in the known art. A cartridge reel is designed to receive multiple smaller, flexible product standard storage reels in an epicyclic wheel arrangement for storing and laying the flexible product. The cartridge reel is rotated to bring a selected standard product storage reel from a storage position into a laying position where the product may be taken from the product storage reel and laid on the sea floor. A reel drive head is mounted with the product storage reel for laying product and maintaining proper tension on the product during laying operations.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming part of this disclosure. For a better understanding of the present invention, and the operating advantages attained by its use, reference is made to the accompanying drawings and descriptive matter, forming a part of this disclosure, in which a preferred embodiment of the invention is illustrated.
In the accompanying drawings, forming a part of this specification, and in which reference numerals shown in the drawings designate like or corresponding parts throughout the same:
As seen in FIGS. 1 and 6-8, the invention is generally indicated by reference numeral 10. Carousel product reel 10 is generally comprised of a cartridge reel 12 and a plurality of product reels 14, means 16 for holding the cartridge reel 12 in a selected position and rotating the cartridge reel 12 into a different position, and means 18 for selective, individual rotation of each of the product reels 14.
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Because the invention is configured to lay product stored on the smaller product reels 14, the cartridge reel 12 of the invention may be provided with structural side members 20 of a smaller diameter than those on a typical reel. The cartridge reel 12 is provided with a drive ring 22, best seen in
The product reels 14 are typical storage reels used for flexible product such as cable or flexible pipe. Each product reel 14 is paired with means 18 for selective rotation and holding the reel 14 in place in the form of a reel drive head 26 that locks into the central core of the product reel 14. For ease of availability and use, the reel drive head 26 is preferably a standard reel drive head as typically used in the offshore industry.
In operation, product reels 14 are loaded at an onshore location with product 28 such as cable or flexible pipe. The product reels 14 may be installed onto a cartridge reel 12 at an onshore location so that the cartridge reel 12, filled with product reels 14 having product, is ready for lifting and installation onto a product laying vessel 15 in a single lift as seen in
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It should be understood that, while the drawings illustrate equipment for vertical lay of the product, equipment for horizontal lay of the product may also be used.
The invention provides several advantages over the previously used pipe and cable laying reels.
The invention will allow the storage of more reels in a smaller area/footprint.
The invention also allows multiple storage reels to be lifted for installation onto, or removal from, the laying vessel in a single lift of the main reel instead of multiple smaller lifts from a supply vessel.
While specific embodiments and/or details of the invention have been shown and described above to illustrate the application of the principles of the invention, it is understood that this invention may be embodied as more fully described in the claims, or as otherwise known by those skilled in the art (including any and all equivalents), without departing from such principles.
