A new algorithm for fault tree of pipeline corrosion based on failure correlation

In order to predict the occurrence of pipeline corrosion failure and control the pipeline corrosion reasonably, the hazard factors of oil and gas pipeline corrosion were analyzed and its fault tree was established. Considering the effect of the accuracy of basic event failure probability to the significance of fault tree calculation, the D-S evidence theory and the basic Atanassov intuitionistic fuzzy theory were introduced to improve the fuzzy probability calculation method used for basic event. In order to increase the calculation precision of failure probability of top event and minimum cut sets of fault tree, the failure probability analysis model was established for the parallel system of minimum cut sets' basic events based on the modified Hamacher operator. A sequencing/combining method considering attributes and classification of basic event was put forward to calculate the failure probability of multi-basic event combination. It is indicated that this method can greatly improve the calculation accuracy of failure probability of top event. The research results provide theoretical basis for the effective prevention of oil and gas pipeline corrosion.