China Petroleum Pipeline Engineering (CPP) was hired by PetroChina Southwest Pipeline Company to complete the work on the China-Myanmar Oil and Gas Pipeline, a pressurized 40-inch (1.02-mm) by 80-grade gas pipeline, using mechanized flux-cored arc welding (FCAW) in-service welding technology. The poor construction environment was a great challenge to the project, which is located in Guizhou Province China, a region featuring complex landform and geological hazards. The pipeline spans three kinds of terrain, but 80% of it is routed through mountainous areas. The main task of the project was to install a 1.42-inch (0.04-mm) thick Type B sleeve to repair the defective pipe girth weld without shutdown. CPP uses mechanized FCAW in-service welding technology to complete the longitudinal butt welds and circumferential fillet welds.
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