Abstract: In order to identify precisely and comprehensively pipeline risk factors and improve the safety level of pipeline running, the composition of pipeline integrity risk assessment system was analyzed from the perspective of life cycle, Cone-ANP analysis structure of pipeline risk assessment indexes was constructed and weights of the indexes were obtained by using Cone-ANP. In the last, the results were compared with those obtained by using traditional ANP. The results show that pipeline risk factors exist in every phase of its life cycle,that supervision and serious consequence identification are two factors affecting significantly pipeline integrity, and that in the perspective of life cycle, the weight of corrosion is low, and the weights of assessment indexes obtained by using Cone-ANP method are more objective and reasonable.

Key words: oil and gas pipeline, pipeline integrity, risk assessment, Cone-ANP, life cycle