Abstract: This paper proposes a risk assessment approach for a tension leg platform (TLP), named hybrid fuzzy-statistical process control (SPC) model, which provides more precise estimation than other commonly used methods. The hybrid fuzzy-SPC model is designed to follow risk source identification and establishment of risk index groups. It has three components: fuzzy comprehensive evaluation method, analytic hierarchy process (AHP), and SPC theory. In comparison to applying only one of the three, the hybrid fuzzy-SPC model usually results in reduction in uncertainties and subjectivities. The fuzzy comprehensive evaluation method and the AHP are used to obtain several independent risk evaluation scheme results. Then, based on the SPC theory, a practitioner is able to derive a confidence interval using the central limit theorem. This will largely mitigate risks and enable preventive action before a platform loses floating attitude.

Key words: Tension leg platform (TLP); Risk assessment; Floating attitude; Hybrid model; Fuzzy-statistical process control (SPC)

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