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X65 Steel Pipeline Effectively Laid In China Deepwater Gas Field

Offshore, polar, as well as deepwater oil and also gas fields face rough service conditions such as wave, current, and also salt water deterioration, which call for better requirements than onshore pipelines, and subsea oil and also gas pipelines typically have service durations of more than twenty years, requiring the use of high-performance pipeline steel. DNV-OS-F101 Seabed Pipe Requirements has strict needs on the transverse strength, longitudinal strength, low-temperature dynamic tear resistance, weldability, pressure resistance and also acid tool deterioration resistance of submarine pipeline steel.

offshore pipe laying

The lengthiest offshore pipeline on the planet is the Langeled gas pipeline, which was laid between Norway and also Causation from 2004 to 2007, with a size of 1173km and the deepest point is 2775m. here are offshore pipe design in recent years:

On May 23, 2020, the sea pipeline of the Lingshui 17-2 task, China's initial deepwater gas area, was successfully laid at 1,532 meters, breaking China's brand-new record for sea pipe laying as well as the initial procedure at 1,500 meters of "ultra-deepwater". The job used more than 10,000 lots of undersea steel pipeline from Henggang, Hunan province. The simulation experiments of the external pressure of these deep-sea pipes reveal that the steel tube can hold up against 35Mpa and can be used for external stress over 35m water deepness.

The deepwater steel pipeline is characterized by large wall density relative to outer size proportion, high dimensional accuracy, and so on. This is since the submarine pipe has remained in service in the aquatic atmosphere of low temperature, high stress as well as solid deterioration for a long time. It not only births a load of inner as well as external stress, axial force as well as flexing moment however likewise births the vibrant load of alternating outside stress, wave as well as existing. The strength, wall density, and also dimension satiation of steel pipeline are specifically crucial to avoid pipeline damage. Meanwhile, with the constant boost of pipe laying deepness and communicating stress, high steel grade, huge pipe diameter, and also big wall surface thickness are the growth fad for the offshore pipeline.

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