The fatigue calculation methodology applied to flexible risers connected to FPSOs, offshore Brazil, is based on a simplified procedure considering a deterministic regular wave approach and a wave heading distribution supported by past operational experience with semi-submersible platforms. However the utilization of deterministic waves approach does not necessaries guarantee the consideration of the worst sea conditions, and the weathervaning capability of those systems are usually not accounted for when non-collinear wave, wind and current are present. A new procedure is being evaluated considering an integrated model for ship, mooring lines and risers to define the distribution of ship headings for fatigue analysis using an irregular bi-directional sea approach. The impact on a flexible riser's fatigue life will be evaluated when a new ship heading distribution with irregular bi-directional spectrum is presented for the case of a FPSO with bow turret in operation at the Marlin Field offshore Campos Basin.
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机译：应用于柔性立管的疲劳计算方法，其海上巴西连接到FPSOS，基于考虑确定常规波方法的简化程序和通过过去的半潜式平台的过去的操作经验支持的波浪标题分布。然而，确定性波动方法的利用不需要保证对最差的海洋状况的考虑，并且这些系统的风化能力通常不会占当非共线波，风和电流的情况下。考虑到船舶，系泊线和立管的综合模型进行评估新程序，以使用不规则双向海方法来定义船舶标题分布的船舶标题。当在Marlin Field Offshore Campos盆地运行的FPSO的情况下，将对具有不规则双向谱的新船舶标题分布进行新的船舶标题分布时，将评估对灵活提升机疲劳寿命的影响。
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