Study On Risk Assessment Of Urban Gas Pipeline Network

Urban gas pipeline network is an important infrastructure for the continuous transmission of gas for the production of various enterprises and the life of residents in the city.The human factors,pipeline and equipment factors,environmental factors and management factors involved in its construction and operation will lead to gas leakage,combustion or explosion accidents.Therefore,it is of practical significance to carry out risk assessment and identify the weak links of the system to ensure its safe and stable operation.Hazard and Operability Analysis method is lack of quantitative basis when applied to risk assessment of urban gas pipeline network,which leads to the lack of objectivity of the proposed measures.In this paper,the risk matrix is introduced into the HAZOP analysis process,and the risk matrix and acceptable risk level are used to judge the necessity of adding or improving the safety protection measures,so as to improve the pertinence of the proposed measures.This paper selects the storage and distribution station in the urban gas network system as the application object,takes the filtration process and pressure regulating process as examples,gives the detailed analysis process,and puts forward the corresponding safety measures.According to the accident cause theory,leakage accident of gas pipeline is caused by many factors,such as man machine environment pipe.There is an uncertain relationship among the factors,but the bow tie model can not express the uncertain relationship among the factors.Therefore,based on Bayesian network,this paper carried out quantitative risk assessment method of urban gas pipeline leakage accident probability.Through five simulation scenarios,the occurrence probability of dangerous consequences such as gas leakage,combustion or explosion of urban gas pipeline in different situations is simulated,which provides decision support for the safe and stable operation of urban gas pipeline.