Probabilistic Investigation of Explosion Effect on Fluid Pipe Lines

Babaei, MohammadHosein (2019) Probabilistic Investigation of Explosion Effect on Fluid Pipe Lines. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Abstract: One of the most important forces that may apply to transmission lines is the force caused by the explosion in the water. Buried pipes are used to transport energy and water supplies. The underwater explosion can lead to fatal damages to water pipelines and cause critical threatening damages for pipeline bearing capacity, which is one of the major threats to the security of maritime structures. Although the pipelines are one of the surest and most reliable ways to transport oil, it can cause irreparable environmental effects in case of damages.This is important when the pipeline passes near to residential areas or water resources. Therefore, due to the energy stored in the transmission lines, the prevention of explosion is an important role. In the past, it has been observed that these lines are vulnerable to damage caused by blasts and any disruption of their performance can cause irreparable damages. Therefore, they should be designed to resist against phenomena such as earthquakes and explosions. Due to the necessity of protection of pipelines, the design of pipe lines to transport oil throughout the pipeline life cycle is an important role. According to the importance of safety of the pipeline behavior against the charge of the blast, the dynamic behavior of the pipeline system with surrounding soil, water and air is investigated under the load of the TNT with a mass of 1000 kg. In order to simulate the behavior models of explosion, the JWL equation is used for explosion. Research Aim:In this thesis, the pipeline transmission system with surrounding domains is investigated under nonlinear dynamic analysis to investigate the system failure mechanism affected by the underwater explosion. The main purpose of this thesis is extracting the system response which consists of deformation, principle stresses in the body, as Contour and time history curves. Also, the effect of TNT on the dynamic performance of the pipeline under the explosion load effect is investigated. Research method:For modeling and analysis of finite element method, Ansys workbench is used and the desired outputs are obtained. To evaluate the effect of the explosion and the weight of TNT on the dynamic response of the system, the probabilistic analysis is used and the results are extracted from the output responses. Findings: The first finding consists of pipeline deformation in the three directions, principle stresses in the body and hydrodynamic pressure that have been illustrated in the form of Contour and time history curves. Conclusion:Due to the obtained curves and Contour, the critical state of the system and the failure mechanism can be investigated. According to the results, the necessary prediction can be applied during the pipeline design to minimize the damage when the system blast occurs.

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