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هشتمین همایش بین المللی سواحل، بنادر و سازه های دریایی
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همایش ، رویداد ، ژورنال
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  • wall thickness optimization for ultra-deepwater pipeline system

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    • تاریخ ارائه: 1387/01/01
    • تاریخ انتشار در تی پی بین: 1387/01/01
    • تعداد بازدید: 698
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     recent advances in pipe manufacturing techniques and pipeline construction have enabled the installation of larger diameter pipelines in ultra-deepwater locations (water depths greater than 1,500 meter). results of recent work have demonstrated the beneficial effect of a modified uoe (u bending, o forming, expansion e) manufacturing approach on linepipe collapse resistance (kashani 2008). through the modified uoe fabrication process, in combination with low heat treatment process significant improvements in collapse resistance is obtained. the use of modified forming parameters and heat treatment during pipe manufacture may enable to increase the collapse reduction factor given by the offshore codes. the enhanced fabrication parameters however are not considered in the present work but have only been identified as additional controlling parameters in ultra-deepwater pipeline sizing. a comparatively new method of pipeline construction in ultra-deepwater, is the j-lay method. in the j-lay method the lengths of line pipe are welded to each other whilst supported in an almost vertical position by the tower. the near-vertical configuration of the pipe at water level results in relatively small horizontal and vertical reaction load on the stinger. the method is attractive as the pipe overbend strains are low and the horizontal force required for stationkeeping is often within the capability of dynamic positioning systems. the tension capacity for most present j-lay vessels is limited to 550 tonne and the pipelay rate is shown to be inherently slower than the conventional s-lay method. for this reason, in addition to hydrostatic collapse and local buckling considerations, the designer must make sure that the vessel tension capacity is not exceeded. a careful consideration must also be given to the barge thrust in reducing the installation cost.

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