RELIABILITY ANALYSIS OF PITTING-CORRODED OFFSHORE PIPELINE UNDER UPHEAVAL BUCKLING CONDITION

This research presents a development of a fatigue analysis for different corroded pipeline to estimate the pipeline reliability when subjected to upheaval buckling caused by thermal expansion. This assessment will be used to initialize the stress-strain diagram so that the result will be adaptable to predict the reliability and probability of failure for oil and gas pipelines under buckling. the input of this assessment was the pitting-corroded pipelines and the loads it is subjected to, the inputs are validated through a methodology that includes testing the pipeline for buckling under different rates of pitting-corrosion, the output was the reliability of the pipeline expressed via graphical presentation using MATLAB, the generated graphs indicates that a corrosion ratio of >2.34% is considered crucial for pipes subjected to upheaval buckling. Finite Element Modeling-ANSYS was used in this thesis to give the broadest possible comparison between the obtained results and the theoretical behavior of the pipe, it was used to follow up the stress-strain shape of sub-sea corroded pipelines under upheaval buckling during its propagation.