Corrosion Analysis and Control Measures of Long Distance Natural Gas Pipeline

Corrosion reasons of a natural gas long-distance pipeline in Feicheng city were analyzed. The results showed that the main reason for corrosion perforation was that water was stored at the bottom of the pipeline for a long time. The pipeline was not in use within 1 year after the laying out, and oxygen corrosion occurred. After the pipeline was put into operation, the corrosion was aggravated due to the dissolution of CO₂ from the natural gas into water. Under the combined action of oxygen corrosion and CO₂ corrosion, the perforation failure of the pipeline occurred eventually. In the view of the corrosion problems, the corresponding proposals were put forward, and the corrosion protection and control measures were developed.