X65 Steel Pipeline Effectively Laid In China Deepwater Gas Area

Posted by Donald on January 24th, 2021

Offshore, polar, and also deepwater oil and gas fields face severe solution problems such as wave, current, as well as seawater rust, which require higher quality demands than onshore pipelines, and subsea oil as well as gas pipes generally have solution durations of greater than 20 years, requiring using high-performance pipe steel. DNV-OS-F101 Seabed Pipeline Specification has strict requirements on the transverse toughness, longitudinal toughness, low-temperature vibrant tear resistance, weldability, stress resistance and acid medium corrosion resistance of submarine pipe steel.

offshore pipeline laying

The lengthiest overseas pipeline on the planet is the Langeled natural gas pipeline, which was laid between Norway as well as Causation from 2004 to 2007, with a length of 1173km and the deepest factor is 2775m. below are offshore pipeline design in recent times:

On May 23, 2020, the sea pipeline of the Lingshui 17-2 task, China's very first deepwater gas area, was effectively laid at 1,532 meters, breaking China's new record for sea pipeline laying as well as the initial operation at 1,500 meters of "ultra-deepwater". The job utilized greater than 10,000 lots of undersea steel pipeline from Henggang, Hunan district. The simulation experiments of the exterior pressure of these deep-sea pipelines show that the steel tube can hold up against 35Mpa and Click here for more info can be used for exterior pressure over 35m water depth.

The deepwater steel pipeline is defined by large wall surface thickness relative to outer diameter ratio, high dimensional accuracy, etc. This is because the submarine pipeline has actually remained in solution in the marine setting of reduced temperature, high pressure as well as solid rust for a long period of time. It not just births a load of interior and also exterior pressure, axial force and also bending minute however additionally bears the dynamic tons of alternating exterior stress, wave and also existing. The strength, wall density, as well as dimension satiation of steel pipe are especially important to avoid pipe damages. At the same time, with the continual increase of pipeline laying deepness and also conveying stress, high steel grade, big pipe diameter, and also large wall surface density are the growth fad for the overseas pipe.