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A Study on Reliability-Based Assessment of Ageing Fixed Offshore Platforms Located in the Arabian Gulf


 Offshore platforms and tubular structures are examples of lightweight supporting structures for oil and gas and wind energy production units. However, their reduced weight is obtained at the expense of increased susceptibility to fatigue failure because of their tubular welded joints or connections. Hence extra consideration must be given to the fatigue design of the hot spots. The objective of the proposed shell fatigue design methodology for critical jacket joints is to calibrate the fatigue reliability for inspection planning studies. This study summarises research on the development and use of reliability-based jacket joints inspection planning approaches for offshore structures. The main objective of the study is to reduce the uncertainty introduced by SCF calculations on crucial joints by modelling such joints as an FEM shell model. The study also provides an application process and workflow for a standard Arabian Gulf jacket for fatigue reliability assessment. First Order Reliability Method (FORM) is used to determine the reliability index. The study also provides insights into methods for planning in-service inspections of ageing offshore platforms.