Study on Fuzzy Evaluation of Municipal Underground Gas Pipeline

Municipal underground gas pipeline (MUGP) takes a high risk, because it would cause serious social and environmental impacts when it once failed. In order to ensure the safety and robustness of MUGP, a fuzzy integrate assessment and AHP are used together to analyze their randomness and fuzziness. This paper firstly reviews the research about MUGP. Based on the assessment theory of risk, the factors, which influence the fault frequency and consequence, are analyzed. Furthermore, the compartmental rule of fault frequency and fault consequence is given. Through comparative research, we get the conclusion that the main factors resulting in MUGP failing are corrosion, manufacture and installation bug, social environment and nature hazard. The common practice that using R = P⋅C to evaluate the risk may lead to unfavorable results. So, the assessment is divided into three stages: the first stage is to assess the risk probability (RP), the second one is evaluating the risk of consequences (RC), and the last one is giving the risk scores according to the risk matrix (RM). At the end of this research, the author gives a case study, which testifies that the proposed method is so valid and feasible.