Jiangsusirbang Petrochemical mainly constructs and operates 2.4 million tons/year alcohol-based polygeneration project, which uses methanol as raw material to produce propylene, ethylene and derivative fine chemical products.  The EVA reaction dam in the plant is a high pressure and high-risk protection area. There are a large number of pipe flanges and key unit production equipment in this area, which requires 24-hour monitoring and inspection.  Traditional manual inspection is time consuming, slow, low efficiency and high safety risk, and the quality and reliability of inspection are restricted by objective factors such as individual experience.