Problems and Application on External Coating of Long-distance Pipeline

The description on the application of external coating for long-distance pipeline in China is given in this article. Viewpoints upon the design criteria of external coating of pipelines is presented on the basis of technical requirements on the property and selection standards of external coating for buried pipelines. The authors analyze the technical limitations in necessary field coating for welded joint, coating operation and quality control, and put forward solutions for the application of external coating of pipelines.