Offshore, polar, and also deepwater oil and gas areas deal with harsh service problems such as wave, current, and also seawater corrosion, which require higher quality requirements than onshore pipelines, as well as subsea oil and gas pipes normally have service periods of greater than two decades, calling for the use of high-performance pipeline steel. DNV-OS-F101 Seabed Pipe Requirements has rigorous demands on the transverse stamina, longitudinal stamina, low-temperature dynamic tear resistance, weldability, strain resistance and acid medium rust resistance of submarine pipeline steel.
offshore pipe laying
The longest overseas pipe worldwide is the Langeled gas pipeline, which was laid between Norway as well as Causation from 2004 to 2007, with a length of 1173km as well as the deepest point is 2775m. right here are overseas pipeline design in recent years:
On May 23, 2020, the sea pipeline of the Lingshui www.wldsteel.com 17-2 job, China's very first deepwater gas area, was effectively laid at 1,532 meters, damaging China's new record for sea pipe laying as well as the very first operation at 1,500 meters of "ultra-deepwater". The task used greater than 10,000 lots of undersea steel pipe from Henggang, Hunan province. The simulation experiments of the exterior stress of these deep-sea pipes reveal that the steel tube can hold up against 35Mpa and can be made use of for outside pressure over 35m water depth.
The deepwater steel pipeline is characterized by big wall thickness relative to outer size ratio, high dimensional accuracy, and so on. This is because the submarine pipeline has been in service in the marine atmosphere of low temperature, high pressure as well as strong corrosion for a long time. It not only bears a tons of interior and exterior stress, axial force and also bending minute but additionally births the dynamic lots of rotating outside stress, wave and present. The stamina, wall surface thickness, and also dimension roundness of steel pipeline are especially vital to avoid pipe damage. On the other hand, with the continual rise of pipeline laying deepness and sharing pressure, high steel quality, big pipe size, and big wall thickness are the development fad for the overseas pipeline.