Pipeline prefabrication, pipeline design, prefabrication management, pipeline cutting, pipeline groove processing, welding, logistics and anti-corrosion paint, pipeline flaw detection and other work in a fixed area. Pipeline engineering is divided into pipeline prefabrication, on-site prefabrication and on-site installation. Advantages of pipeline prefabrication: It is convenient to coordinate and control quality, progress and management in a fixed area, reduce the workload of on-site prefabrication and on-site installation, and greatly improve the installation, quality and progress of the entire project.