Abstract
Jacket platforms are widely used for hydrocarbon production in the oil and gas offshore field so far. After years of operation in jacket platforms, a structural integrity check is required to investigate whether the structure of the jackets is fit for purpose or not. So, maintenance, repair, and strengthening become an ongoing and continual process during the jacket platform's life. Corrosion, fatigue, vessel collisions, heavy dropped objects, and severe storms are the main reasons for damages. These events lead to perforation, dent, failure, and strength reduction of jacket elements. In this paper, a set of finite element models is used to model each damage case. Moreover, Strengthening, Modification, and Repair (SMR) techniques observe the members' behavior and the efficiency of the repair action. Also, multi-criteria analysis is presented for prioritizing the SMR techniques using the technique for preference by similarity to ideal solution (TOPSIS) method. The results and insights, the ultimate strength for both damage and repaired cases, provide a supportive view to the engineers to design a proper repair method. What is more, the results provide an ideal solution in selecting alternatives for repair methods.
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