Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Reliability assessment of corroded pipelines considering the real corrosion profile
Submission Author:
Rodolfo Miiller Santos Cabral , PE
Co-Authors:
Rodolfo Miiller Santos Cabral, RENATO MOTTA, Silvana Maria Bastos Afonso da Silva, Adriano Dayvson Marques Ferreira, Paulo Roberto Maciel Lyra, Marco Antônio Figueirôa da Silva Cabral
Presenter: Rodolfo Miiller Santos Cabral
doi://10.26678/ABCM.COBEM2021.COB2021-1410
Abstract
The use of computational tools to assess the structural integrity of pipelines with corrosion defects has made significant progress in recent years. These tools can evaluate pipelines models with simple idealized corrosion defects or pipelines with complex corrosion defects. Although the evaluations through the computational tools are accurate, their input data for the construction of the geometric model and the material properties have a certain degree of uncertainty that must be considered when assessing the structural integrity of the pipelines. The reliability analysis of corroded pipeline has been studied for the last 30 year and today is considered in standards code and is used in practice. But almost the totally of the literature in this issue is focused in defects with uniform depth, called idealized defects. In the present work the reliability analysis of corroded pipelines will be studied considering the real remain wall thickness profile of the pipe in the corrosion region (river bottom profile). In this work, the reliability analysis of the corroded pipelines will be performed using the FORM (First-Order Reliability Method). The structural integrity assessment (internal pressure capacity) will be computed via nonlinear numerical simulation (FEM – finite element method) of 2D axisymmetric pipelines models. The objective will be to compare the probability of failure using two geometries, the first will consider idealized defects and the second model will consider the river-bottom profile of the corrosion defect. The results shown that the consideration of the rbp can increase the reliability index between 10% and 40%.
Keywords
Pipelines, reliability, River-bottom profile, Internal Pressure, Real Corrosion Profile
