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This paper presents the effect of external corrosion, material properties,operation condition and design thickness in pipeline on failure prediction using a failureprobability model. The effects of environmental, operational, and design random variables suchas a defect depth, a pipe diameter, a defect length, fluid pressure, a corrosion rate, a materialyield stress and a pipe thickness on the failure probability are systematically studied using afailure probability model for the corrosion pipeline.