According to the division of the offshore oil industry, the oil and gas resources in the sea of more than 300 metres water depth are called deep water oil and gas, and the oil and gas resources in the sea of more than 1500 metres water depth are called ultra-deep water oil and gas. Submarine pipeline is an important way to transport the oil and gas resources extracted from the seabed to the land over long distances.
Due to the harsh marine environment than the land, submarine pipeline construction and operation safety requirements are much higher than the land pipeline, so the reliability of the deepwater submarine pipeline has put forward higher requirements, then, deepwater submarine pipeline why use LSAW steel pipe?
As a result of hydrostatic pressure collapse of deep-water submarine pipelines, pipeline in place, pipeline construction and pipeline suspension across a variety of conditions, in addition to the need to meet the high strength, high toughness, as well as good welding performance and corrosion resistance and other general requirements, compared to land pipelines, deep-water submarine pipelines in the design of the following characteristics.
1.wall thickness. Deep-water submarine pipeline wall thickness design is larger, LSAW steel pipe with a higher level of internal stress, with a larger calibre, the limitations are small, not only to ensure a high level of strength, but also good toughness and welding performance, the technical requirements of the process is high.
anti-deformation requirements. Due to the complexity and variability of offshore pipe-laying operations and deep-water submarine pipeline operating environment, the pipeline is sometimes subjected to large displacements and strains, LSAW steel pipe in the total elongation of its tensile test, a larger uniform plastic deformation of the elongation of one of the characteristics of its performance, and the homogeneity of the microstructure of the pipeline to provide a guarantee of uniform plastic deformation.
In general, LSAW steel pipe can well complete the requirements of deep-water submarine pipeline, Huayang Steel Pipe has formulated a detailed quality plan of rolling and welding process according to the requirements of deep-water submarine pipeline's mechanics and performance, and adjusted the parameters of production line according to the different needs of customers to ensure the qualified quality of LSAW steel pipe.
