A New Function for Frequency Analysis in the Risk Assessment of Offshore Oil-Related Platforms

IF 1.3 4区 工程技术 Q3 ENGINEERING, CIVIL
F. Kaneko, T. Yuzui
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引用次数: 0

Abstract

Risk assessment of offshore oil-related platforms such as the floating production storage and offloading system (FPSO) is extremely important. In earthquakes prone to target sea areas, earthquakes should be considered as one of the important external forces that cause severe damage. In such risk assessments, for estimating the appearance frequency of seismic energy, the complementary cumulative distribution function (CCDF) of seismic energy of a considered area is usually based on the Gutenberg–Richter law. Furthermore, it is important to estimate the CCDF of the leak hole diameter when estimating the damage caused by an oil spill accident in an offshore oil-related platform. Some ship classification societies recommend using a formula based on the power law distribution as used in those processes. However, the power law distribution has a drawback in that, i.e., it is essentially impossible to accurately estimate the CCDF over the entire domain of the random variables. The authors have developed an enhanced power law distribution function that eliminates such defects in the power law distribution function and some practical methods for estimating its parameters. In this study, the developed function is applied to the CCDFs of the seismic energy and leak hole diameter. The results demonstrate that the function fits the existing data with sufficient accuracy. Therefore, the new function introduced here can be well used in the frequency analysis of the risk assessment of offshore oil-related platforms. In the risk assessment of offshore oil-related platforms like floating production storage and offloading system (FPSO), it is necessary to estimate probabilistic characteristics of external forces against them. Earthquakes are a major external force. Furthermore, it is necessary to estimate the damage when an external force is applied. The frequency of external forces, such as earthquakes, is low, but the damage is extensive. However, damage to offshore oil-related platforms is caused by not only these external forces, but also oil leaks resulting from some factors, such as operation errors and corrosion, that may cause accidents such as fire and explosion. Therefore, it is also essential to estimate the probabilistic characteristics of such damage for the risk assessment of offshore oil-related platforms.
海上涉油平台风险评估中频率分析的新功能
海上石油相关平台的风险评估非常重要,如浮式生产储油卸载系统(FPSO)。在地震易发的目标海域,地震应被视为造成严重破坏的重要外力之一。在这种风险评估中,为了估计地震能量的出现频率,考虑区域的地震能量的互补累积分布函数(CCDF)通常基于古腾堡-里希特定律。此外,在海上涉油平台溢油事故的损失评估中,泄漏孔直径的CCDF的估算是非常重要的。一些船级社建议使用在这些过程中使用的基于幂律分布的公式。然而,幂律分布有一个缺点,即,基本上不可能准确地估计整个随机变量域上的CCDF。作者提出了一种改进的幂律分布函数,消除了幂律分布函数的这些缺陷,并提出了一些实用的估计其参数的方法。本文将所建立的函数应用于地震能量和泄漏孔直径的ccdf。结果表明,该函数能较好地拟合现有数据。因此,本文引入的新函数可以很好地用于海洋涉油平台风险评估的频率分析。在浮式储油卸载系统(FPSO)等海上石油相关平台的风险评估中,有必要对其所受外力的概率特征进行估计。地震是一个主要的外部力量。此外,有必要估计施加外力时的损伤。地震等外力的频率很低,但破坏范围很广。然而,海上涉油平台的损坏不仅是由这些外力造成的,还有一些因素造成的漏油,如操作失误、腐蚀等,可能导致火灾、爆炸等事故。因此,在海上涉油平台的风险评估中,对此类损害的概率特征进行估计也是必不可少的。
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来源期刊
Journal of Ship Research
Journal of Ship Research 工程技术-工程:海洋
CiteScore
2.80
自引率
0.00%
发文量
12
审稿时长
6 months
期刊介绍: Original and Timely technical papers addressing problems of shipyard techniques and production of merchant and naval ships appear in this quarterly publication. Since its inception, the Journal of Ship Production and Design (formerly the Journal of Ship Production) has been a forum for peer-reviewed, professionally edited papers from academic and industry sources. As such, it has influenced the worldwide development of ship production engineering as a fully qualified professional discipline. The expanded scope seeks papers in additional areas, specifically ship design, including design for production, plus other marine technology topics, such as ship operations, shipping economic, and safety. Each issue contains a well-rounded selection of technical papers relevant to marine professionals.
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