Content introduction 1 Pipeline construction process and requirements 1.1 Pipeline construction process includes: surveying and setting out, removing obstacles, detecting underground obstacles, repairing construction work belts and access roads, excavation of pipe trenches, pipeline anti-corrosion insulation, pipe fitting prefabrication, transportation of anti-corrosion pipes, on-site pipe layout, pipeline assembly and welding, non-destructive testing, anti-corrosion joint coating and leak detection, pipeline laying, backfilling, and landform