Offshore, polar, and deepwater oil and also gas fields deal with rough solution problems such as wave, current, as well as seawater rust, which require higher quality requirements than onshore pipes, as well as subsea oil as well as gas pipelines normally have service durations of greater than two decades, calling for the use of high-performance pipeline steel. DNV-OS-F101 Seabed Pipeline Spec has stringent demands on the transverse stamina, longitudinal strength, low-temperature vibrant tear resistance, weldability, strain resistance and also acid tool rust resistance of submarine pipe steel.

offshore pipeline laying

The longest overseas pipe on the planet is the Langeled gas pipe, which was laid between Norway and also Causation from 2004 to 2007, with a size of 1173km and also the deepest point is 2775m. below are overseas pipe design in the last few years:

On May 23, 2020, the sea pipeline of the Lingshui 17-2 job, China's first deepwater gas Discover more here area, was efficiently laid at 1,532 meters, breaking China's brand-new record for sea pipe laying and the very first operation at 1,500 meters of "ultra-deepwater". The job made use of greater than 10,000 lots of undersea steel pipeline from Henggang, Hunan district. The simulation experiments of the outside pressure of these deep-sea pipelines show that the steel tube can hold up against 35Mpa and also can be utilized for outside stress above 35m water depth.

The deepwater steel pipe is defined by huge wall surface thickness about outer size ratio, high dimensional precision, etc. This is due to the fact that the submarine pipeline has remained in solution in the aquatic environment of low temperature, high stress and also strong corrosion for a very long time. It not only births a tons of internal as well as external stress, axial pressure and flexing minute yet also bears the dynamic tons of rotating outside pressure, wave and current. The toughness, wall thickness, and also measurement roundness of steel pipe are particularly crucial to stop pipeline damage. Meanwhile, with the continual rise of pipe laying deepness and conveying stress, high steel grade, large pipe size, and large wall thickness are the advancement pattern for the offshore pipe.