Accident Analysis And Risk Assessment Of Gathering Line Of Yan-Chang Gas Field

Pipeline transportation is a special mode of transport. It has a large volume, and doesn’t affected by climate and other factors, continuous operation and relatively low cost advantage. With the development of pipeline transportation, pipeline safety and reliability issues have become increasingly prominent. In order to effectively prevent the occurrence of pipeline accidents, reduce property damage and casualties. From a security perspective piping system, Analysis, demonstrate and evaluate their risks in the operation, and Propose practical control measures. It has great significance for the safe operation of the pipeline.In this paper, based on the detailed analysis of the safety checklist analysis, Preliminary Hazard Analysis, pipeline risk assessment and probabilistic risk evaluation methods. According to the characteristics of Yan Chang Gas Field Gathering Pipeline (hereinafter referred to as "Gathering Pipeline"), the data has been collected, comprehensive measured. Risk assessment Fault Tree Analysis (FTA) has been Selected as a method for risk assessment of the system.In introducing the constitute the fault tree, using a variety of data of gathering pipeline, analysing the failure reasons both home and aboard, Combining with China Petroleum Standards, the accident cause of gathering pipeline has proposed for5categories and12subcategories. Gathering pipeline failure has been determined as Top Event. Analysis the cause of accident and the mutual logical relationship, identify the Bottom Event, and Fault Tree has been established.67basic events that may lead to pipeline failure has been found and analysed. Using ascending method,88minimum cut sets has been obtained. It indicates that pipeline failure has88kinds of method. From these approaches can find economic, reasonable measures to prevent the pipeline failure.According to the gathering pipeline five failure reason for detailed analysis, the mainly risk status of gather pipeline has been determined. Proceed from the design, material, construction, natural environment, social environment and the pipeline operation management etc, to prevent the pipeline failure countermeasures and preventive measures was expounded, and lay the foundation for the later quantitative analysis.Reference equipment failure rates and reliable factor of human behavior, use of expert subjective judgment and fuzzy algorithm, to estimate the probabilities of basic events of transportation pipeline. In the precondition of meeting the practical engineering application,Assumed the basic events of gathering pipeline failure are random and independent events.To compare the leading approximation progress, interval method and independentapproximation method, calculation the failure probability of gathering pipeline with independentapproximation method, the failure probability is0.4553. By calculating the coefficient ofprobability importance degree, in the basic events, with reducing the occurrence probability ofbasic events, you can quickly and effectively reduces the occurrence probability of the top event.Relative to the coefficient of probability important degree, the critical importance of the morereasonable and practical significance in the evaluation and analysis, therefore, according to thecritical importance of the results of the analysis, proposed the control direction of preventionpipeline failure from the existing defects, corrosion, third party damage and wrong operation.The above research on pipeline system, standardized and scientific management has importantsignificance.