Avaliação da vida útil remanescente através de nova abordagem para análise do dano por fadiga em risers flexíveis

Abstract

Integrity Management of flexible risers should be valued for ensuring operational safety and maintaining the financial return of installed projects. Fulfill this balance, to long-term projects that is high unpredictability of events, it requires the use of conservatism to make it increasingly robust. This paper analyzes the divergence of the main factors determining the fatigue life of flexible risers installed in a SPU (Stationary Production Unit) when comparing the expected design data and the real data collected. Information regarding the fluid transported (internal pressure), draft of the unit and environmental data (wind, wave and current), as well as the simultaneity in the occurrence of the events were considered. This evaluation demonstrates the importance of considering the real data in the revaluations of the remaining useful life as a way to incorporate the happened events and have a most genuine possible result. Therefore, it deals with the relationship between the merit of the safety factors defined in the design phase as a form of contingency by chance occurrences.