A methodology to assess the structural reliability of a pressurized subsea pipeline combing hydraulic analysis of gas-liquid flow and reliability assessment of corroding pipeline is proposed in this paper. The corrosion rate of given corroding subsea pipeline is investigated by analyzing the corrosion mechanism in gas-liquid regime. The limit state functions of the small leak and burst recommended in the general specification ASME B31G are employed to calculate the failure probabilities of the small leak and burst. Due to uncertainties of the basic parameters in the limit state functions, a probabilistic approach rather than deterministic approach is applied to evaluate the failure probabilities with the Monte Carlo method. According to the evaluation result, several suggestions about the in-line inspection and preventive maintenance are given. Furthermore, a detailed procedure for structural reliability analysis of corroding subsea pipeline is presented, and its feasibility is confirmed with a numerical example.
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