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- W2022809733 abstract "Abstract In most cases derrick barges are forced to suspend operations when wave heights exceed five feet and, in many cases, as low as three feet. This severe limitation called for a new approach to derrick barge design. Close analysis of the life span of a typical heavy duty barge shows that during about 85 percent of her life, the barge negotiates lighter loads than her maximum capacity. Before and after setting a package weighing as much as 500 to 800 tons, the barge will spend time driving piles, assisting construction and hoisting small weights which, in most cases, will not exceed 100 tons. The objective of this design was to build a column stabilized derrick barge capable of handling up to 800 tons on the crane or 2, 000 tons on the shear leg when hull borne and up to 250 tons when column stabilized in waves exceeding 10 feet. The further objective of this design was to build a vessel which is competitive in cost with existing vessels of similar capacity. The above objectives were realized by an extensive development program which was conducted in two phases. The first phase was the preliminary design phase in which system operational considerations, such as self-sustaining characteristics, crane load, accommodations, machinery, towing speed, etc., were pitched against engineering considerations, such as CG, weight distribution, natural periods, etc. The result of the preliminary evaluation was a twin hull, variable draft, column stabilized derrick barge having a beam of 106 feet, to enable it to pass through the Panama Canal, and a length of 400 feet. The next phase in the development was a series of three tank tests. A preliminary one, conducted in General Dynamics Electric Boat Division, and two additional ones conducted at The Netherlands Ship Model Basin in Wageningen, The Netherlands. The purpose of these tests was to analyze the vessel's motions, to evaluate mooring forces, to determine various dimensions and to assess the bending moments imposed on the vessel. Most important, the above tests made it possible to evaluate the operational feasibility of the proposed design. In conclusion, it may be stated that this paper demonstrates a way to approach and solve a complex engineering and economic problem, one of many encountered daily in the new and expanding field of offshore technology Introduction Recent developments in offshore construction have brought about an increase in size and capacity of derrick barges in order to satisfy the demands of the industry and make it possible" @default.
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- W2022809733 modified "2023-09-24" @default.
- W2022809733 title "A New Approach to Derrick Barge Design" @default.
- W2022809733 doi "https://doi.org/10.4043/1079-ms" @default.
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