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Quantitative assessment of environmental risk for exposed and dangling marine pipeline

LI Jia-jun;GUO Wei-qi;ZHANG Jie;CHEN Xin-xi;College of Marine Science,Shanghai Ocean University;Shanghai East Sea Marine Engineering Survey & Design Institute;East Sea Marine Environmental Investigating & Surveying Center,SOA China;  
The submarine pipeline,whose operating conditions are directly related to the safety of the offshore oil and gas fields and quality of the marine ecological environment,is a major route of marine oil and gas transportation.In this study,an exposed and dangling submarine pipeline was used as the top of the fault tree to analyze the basic events of the marine environment.Subsequently,a submarine pipeline fault tree model for the marine environment was developed.Then,based on the theory of grey fuzzy identification,a risk assessment system of the submarine pipeline was established based on the grey fuzzy recognition theory and the analytic hierarchy process for each enhanced risk factor.With the above system,the environmental risk assessment of the submarine pipeline in the Pinghu oil and gas field was divided into four segments and risk assessment was carried out to avoid the equalization of information caused by the evaluation of the entire pipeline.The evaluation results cannot truly reflect the situation of the high-stakes segments.A comparison between the evaluation results and the on-site data from 2014 to 2016 showed that the risk level of the submarine pipeline in the P2 segment was higher than those in other segments.It was demonstrated that this model is reasonable and practical.
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