A group of tower type offshore structures in 125 m. water depth is studied. The objective is to determine design and assessment parameters for this kind of structures. The increment in the initial cost of a structure in order to reduce the probability of failure 10 times (ΔCi) yields in the optimal probability of failure. A life quality index (LQI) approach allows making a comparison. Safety factors were obtained as function of ΔCi and hydrocarbons production of the platform.

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