Why do deep sea pipelines use straight seam submerged arc welded steel pipes?
According to the classification of the offshore oil industry, oil and gas resources with a water depth of more than 300 meters are called deepwater oil and gas, and oil and gas resources with a water depth of more than 1,500 meters are called ultra-deepwater oil and gas. The oil and gas resources mined from the seabed of pipelines are an important way to carry out long-distance pipelines from the seabed.
Because the marine environment is higher than the seismometer, the requirements for the construction and operation safety of submarine pipelines are higher than pipeline connections, and higher requirements are therefore placed on the reliability of deepwater submarine pipelines. So why should deepwater submarine pipelines use straight seam submerged arc welded steel pipes?
Considering various working conditions such as deepwater pipe hydrostatic damage, pipeline placement, pipeline construction, and pipeline span, in addition to meeting general requirements such as high strength, high strength, good welding performance and corrosion resistance, deepwater pipes and pipeline construction are compared below, and also have the following design features.
1. Increased wall thickness. The wall thickness of deepwater submarine pipelines is designed to be increased, the internal stress of straight seam submerged arc welded pipes is greater, the caliber is increased, and the restrictions are greater. It is necessary to ensure the above-mentioned strength grade, higher strength grade, and increased wall thickness. It has good psychological and supporting performance, and the requirements for process technology remain high.
2. Anti-deformation requirements. Due to the complex and changeable environment of simulated pipe operations and deep-water submarine operations, the pipeline will sometimes be more deformed than at sea. The uniform plastic deformation elongation of the total elongation of the straight seam submerged arc welded pipe in the tensile test is its performance, and the uniformity of the organization provides one of the uniform plastic deformation of the pipeline.
From the overall process point of view, the straight seam submerged arc welded steel pipe can well meet the requirements of deep-water submarine pipelines. Huayang Steel Pipe has formulated a detailed rolling and welding quality plan based on the mechanical and performance requirements of deep-water submarine pipelines, and adjusted the production line parameters according to the different needs of customers to ensure the quality of the straight seam submerged arc welded pipe.
