Issue 52

S. Budhe et alii, Frattura ed Integrità Strutturale, 52 (2020) 137-147; DOI: 10.3221/IGF-ESIS.52.12 137 Prediction of the burst pressure for defective pipelines using different semi-empirical models S. Budhe, M.D. Banea Federal Center of Technological Education in Rio de Janeiro – CEFET/RJ, Rio de Janeiro/RJ, Brazil sandipiit@gmail.com, http://orcid.org/0000-0002-3235-9232 mdbanea@gmail.com , http://orcid.org/0000-0002-8378-2292 S. de Barros Federal Center of Technological Education in Rio de Janeiro – CEFET/RJ, Rio de Janeiro/RJ, Brazil GeM Institute, UMR 6183 CNRS, CESI, Saint-Nazaire, France silvio.debarros@gmail.com, http://orcid.org/0000-0002-2520-569X A BSTRACT . The main aim of this work is to predict the theoretical burst pressure of defective pipelines using different semi-empirical models and compare them with the hydrostatic test results. A new methodology was formulated with accounting for a minimum thickness (weakest section of the pipe) over the length of the pipe to predict the most conservative burst pressure. With a simple analytical expression, a reasonable accuracy and more conservative burst pressure can be obtained for any arbitrary defect shapes. A variation of burst pressure was found between theoretical prediction and hydrostatic burst test results with respect to the different semi-empirical models even for the same corroded defects. Different defect geometry shape and pipe material conditions are the possible causes for variation in the burst pressure between the semi-empirical models, so a careful selection of these parameters is necessary. The proposed methodology predicted a more conservative burst pressure for all arbitrary defects shapes and can predict reasonably accurate values if it accounts for the axial stress. K EYWORDS . Burst pressure; Metallic pipelines; Remaining strength; Pipeline corrosion; Empirical model ; Corroded pipeline. Citation: Budhe, S., Banea, M. D., de Barros, S., Prediction of the burst pressure for defective pipelines using different semi- empirical models, Frattura ed Integrità Strutturale, 52 (2020) 137-147. Received: 28.11.2019 Accepted: 28.01.2020 Published: 01.04.2020 Copyright: © 2020 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION etallic pipelines are extensively used to transport fluids (oil, gas, water) over a long distance, especially in the oil, gas and petroleum industries. Pipelines are exposed to harsh environmental conditions which lead to defects, such as metal-loss corrosion, gouges and stress corrosion cracking, etc. [1-4]. However, natural corrosion is the M