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A methodology to prevent process piping failures during vapor cloud explosions
International Journal of Pressure Vessels and Piping ( IF 3 ) Pub Date : 2021-06-15 , DOI: 10.1016/j.ijpvp.2021.104436
Ali Sari , Baris Sayin , Majid Pasbani Khiavi

The design and evaluation of offshore structures’ piping systems subject to blast events are of significance and require advanced analysis approaches. They are important because during an explosion rupture of a piping and vessel system leads to the leakage or release of hydrocarbons which will likely cause another explosion. Advanced nonlinear analysis in time domain is required in order to agreeably determine the dynamic behavior of the piping and vessels against blast loadings. A linear approach, for example using Caesar II software package, often gives very conservative results. This conservative design approach results in pipes and vessels with high wall thickness. Such pipes and vessels bring more weight to offshore facilities and are not desirable, especially for floating structures. In other words, advanced non-linear time domain analysis is required if weight reduction is a must. This analysis type, broadly, should consider; i. Drag load and blast overpressure, ii. Nonlinear material features for instance thermal and strain-rate dependence, iii. Effects of nonstructural masses and adjacent piping systems; iv. Pipe supports, v. Failure of flanges and piping detail, vi. Effects of operating temperature on material characteristics, vii. Blast direction/Ignition location/Attenuation sensitivity; viii. Shielding effect, i.e. pipes behind large objects such as vessels, and ix. Effects of pipe insulation, e.g. raised pipe diameters. The study, firstly, examines the approach/techniques to describe for such effects with finite element analysis. This paper then uses case studies to demonstrate the methodology that includes advanced simulation techniques for pipe blast behavior. The case studies include a piping system that is simulated from overall to detail modeling. Simulations are carried out using the general-purpose, FEA package, ABAQUS. The goal of the paper is to discuss the challenges and propose the methodology for realistic simulation of response of a piping system in a blast event. The paper is expected to serve as a complimentary example to recommended practice (FABIG Technical Notes and API 2FB 2006).



中文翻译:

在蒸气云爆炸期间防止过程管道故障的方法

受爆炸事件影响的海上结构管道系统的设计和评估非常重要,需要先进的分析方法。它们很重要,因为在管道和容器系统的爆炸破裂期间,会导致碳氢化合物泄漏或释放,这可能会导致另一次爆炸。需要在时域中进行高级非线性分析,以便满意地确定管道和容器抵抗爆炸载荷的动态行为。线性方法,例如使用 Caesar II 软件包,通常会给出非常保守的结果。这种保守的设计方法导致管道和容器具有高壁厚。这样的管道和容器给海上设施带来了更多的重量并且是不可取的,尤其是对于浮动结构。换句话说,如果必须减轻重量,则需要高级非线性时域分析。从广义上讲,这种分析类型应该考虑;一世。拖曳载荷和爆炸超压,ii。非线性材料特征,例如热和应变率相关性,iii。非结构体和相邻管道系统的影响;四、管道支架,v. 法兰和管道细节的故障,vi。工作温度对材料特性的影响,vii。爆炸方向/点火位置/衰减灵敏度;八. 屏蔽效应,即大型物体(如船只)后面的管道,以及 ix。管道绝缘的影响,例如增加管道直径。该研究首先检查了用有限元分析描述此类影响的方法/技术。然后,本文使用案例研究来演示包括管道爆破行为的高级模拟技术的方法。案例研究包括从整体建模到细节建模的管道系统。使用通用的 FEA 包 ABAQUS 进行模拟。本文的目的是讨论挑战并提出在爆炸事件中真实模拟管道系统响应的方法。该论文有望作为推荐实践的补充示例(FABIG 技术说明和 API 2FB 2006)。本文的目的是讨论挑战并提出在爆炸事件中真实模拟管道系统响应的方法。该论文有望作为推荐实践的补充示例(FABIG 技术说明和 API 2FB 2006)。本文的目的是讨论挑战并提出在爆炸事件中真实模拟管道系统响应的方法。该论文有望作为推荐实践的补充示例(FABIG 技术说明和 API 2FB 2006)。

更新日期:2021-06-18
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