Ferramentas computacionais para a anÃlise de dutos com defeitos de corrosÃo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Pipelines are one of the safest means for transport of petroleum and gas, and the one with the smallest risk to the environment. They also possess high efficiency and productivity. In spite of their exceptional capabilities, they are also a great source of concern of the petroleum companies, since they can be subjected to several types defects, in particular defects caused by corrosion. For pipelines to operates safely, it is necessary to monitor them continually, so that found defects are found and analyzed in a fast and reliable way, to verify the structural integrity of the affected area. In this context, the analysis with the Finite Elements Method (MEF) has been showing a powerful and efficient tool in the structural evaluation of pipes with defects caused by corrosion, because the results obtained by the method are faster and more economical than those from experimental methods, and much more accurate than the results from analytic methods. Expanding the useful life of the pipelines with safety has become a fundamental and very important task for the engineers. In this work, the development of a module that automates the generation of computer models of identified defects, using structured and unstructured (mixed meshes) in the same model is described. This module was implemented with functions written in the programming language PCL (Patran Commando Language) and added to the program PIPEFLAW (Cabral, 2007) developed by the group PADMEC. Some models of pipes with corrosion defects were generated with mixed meshes were created using this program and analyzed. The results obtained with mixed meshes were compared with those obtained structured meshes, to assess the economy and reliability of the alternative meshing scheme. Computer models of pipes with corrosion defects with irregular geometry were also built and analysed. For the creation of these models the commercial program for pre and post processing, MSC.PATRAN was used. A structural non-linear analysis was done for all models to find the internal pressure that would cause rupture in the model, using the commercial finite element solver ANSYS. The results of these numerical analyses were compared with analytical, numerical and experimental results, when available

ASSUNTO(S)

defeitos de corrosao com geometria irregular engenharia mecanica patran dutos corrosion defects corrosion defects with irregular geometry elementos finitos finite elements pipelines patran defeitos de corrosao

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