Correction of risk assessment method for gathering and transportation pipelines in Sebei Gas Field

To assess the risks of natural gas gathering and transportation pipelines in Sebei Gas Field and obtain more accurate risk assessment results, the failure possibility and failure consequence assessment factors of China's current semi-quantitative risk assessment specifications were compared and analyzed. According to the operation status of the gas gathering and transportation pipeline in Sebei Gas Field, 11 first-grade factors and 59 second-grade factors for risk assessment were determined. Analytic hierarchy process (AHP) method was used to calculate and correct the weight of failure consequence assessment factors for the gas gathering and transportation pipeline in Sebei Gas Field, and the calculation method of semi-quantitative risk assessment was determined. Two representative natural gas gathering and transportation pipelines in Sebei Gas Field were selected as examples and the risk assessment was carried out with the methods before and after correction respectively. Comparison of the assessment results of the two methods shows that the corrected semi-quantitative risk assessment method is more consistent with the regional characteristics of Sebei Gas Field and the actual risk condition of the pipeline.