Research on the detachment of pig components and the rescue

This paper aims to verify the effectiveness of the rescue plan for detached pig components in pipelines. Initially, the causes of bolt breakage were analyzed through fracture surface analysis, metallographic inspection, and hardness testing. Next, CAXA simulation software was used to model and analyze the postures of detached pig components within the pipelines. Additionally, simulations were conducted for rescue pigs passing through the one-way valve with these components in various postures, providing theoretical support for formulating pipeline rescue plans for real-world scenarios. The simulation results indicate that rescue pigs can effectively push out detached pig components from pipelines, regardless of their posture, offering valuable insights for future pigging rescues of similar pipelines.