Abstract: Aiming at the leakage accident scenarios under different working conditions during CCUS pipeline engineering operation, the DNV PHAST quantitative calculation software was used to quantitatively calculate the leakage of supercritical/subcritical pipelines of carbon dioxide and determine the pipeline external protection distance of the pipeline. This provides technical support for the engineering design of the pipeline, safety evacuation under accident conditions, and on-site emergency management.

Key words: carbon capture, utilization and storage/ CCUS, pipeline, leakage, safety risk management and control, emergency management