Pipes with UOE process shall go through the different horizontal and vertical stress cycle. These cycles combined will affect the performance of the piping materials under pressure. And pipe forming is determined in the production process, which can achieve the optimum balance between the parameters reproduced, the pipe compression and the pipe expansion. U and O-pressed combination ensures that the pipe size can be controlled to the highest precision. Improve the pipe roundness, the wall thickness and diameter tolerances can guarantee the designer the quality of the pipe, eliminate inaccuracies in the design and production and so that the wall thickness to achieve the optimum.
Recently, Perdido Norte of the Mexico gulf is one of the world's deepest pipeline system, spent about 312 km of UOE line pipe, weighing about 77000 gt and used in the deep sea of 3500 to 8300 feet. One of the sections of the pipeline transport products from Alaminos Canyon 857 to the 994 area. Length of approximately 125.5 km.
In 2001, Bluestream project uses a 94 km, weighing about 45000 gt triple coating high quality polypropylene pipes and elbows. This project is technically very challenging. It is through the Black Sea to transport natural gas from Russia to Turkey. And UOE line pipe relying on its excellent resistance to stress makes it is used for the deepest section of the seabed at a depth of 2150 m. As early as 2000, Exxon Hoover / Diana project uses 64 km of UOE steel pipe, a depth of 1450 m. Deepwater pipe is with very small dimensional tolerances, in order to enhance the anti-static pressure capacity of the pipe and the annular weld fatigue resistance. In addition, 16-inch to 28-inch pipeline is seen as the future direction of deepwater pipeline. UOE technology to replace the use of Pilger seamless steel pipe can significantly reduce costs.
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