Offshore, polar, and deepwater oil and also gas fields face severe service conditions such as wave, existing, and salt water corrosion, which call for higher quality needs than onshore pipelines, and also subsea oil as well as gas pipelines usually have service durations of greater than twenty years, requiring using high-performance pipeline steel. DNV-OS-F101 Seabed Pipe Spec has strict demands on the transverse strength, longitudinal toughness, low-temperature vibrant tear resistance, weldability, pressure resistance and acid tool rust resistance www.wldsteel.com of submarine pipe steel.
offshore pipeline laying
The longest overseas pipeline worldwide is the Langeled natural gas pipe, which was laid in between Norway as well as Causation from 2004 to 2007, with a size of 1173km and also the deepest factor is 2775m. right here are offshore pipeline engineering in the last few years:
On May 23, 2020, the sea pipeline of the Lingshui 17-2 project, China's initial deepwater gas area, was effectively laid at 1,532 meters, breaking China's brand-new document for sea pipe laying as well as the initial operation at 1,500 meters of "ultra-deepwater". The job utilized more than 10,000 tons of undersea steel pipeline from Henggang, Hunan province. The simulation experiments of the outside pressure of these deep-sea pipes show that the steel tube can endure 35Mpa and also can be made use of for external pressure above 35m water depth.
The deepwater steel pipe is identified by huge wall surface density about outer diameter ratio, high dimensional accuracy, and so on. This is due to the fact that the submarine pipe has actually been in solution in the aquatic setting of reduced temperature, high pressure and strong deterioration for a long time. It not just births a lots of inner and also outside stress, axial pressure as well as bending minute but additionally bears the vibrant lots of alternating external pressure, wave as well as present. The toughness, wall surface density, and dimension roundness of steel pipeline are specifically vital to avoid pipe damage. Meanwhile, with the continual rise of pipe laying depth and communicating pressure, high steel grade, big pipeline size, as well as huge wall surface density are the development trend for the offshore pipe.