Offshore, polar, wldsteel co.,ltd and deepwater oil and gas fields deal with severe service problems such as wave, present, as well as salt water deterioration, which call for better demands than onshore pipes, as well as subsea oil and also gas pipes typically have service periods of more than twenty years, needing using high-performance pipe steel. DNV-OS-F101 Seabed Pipe Specification has strict demands on the transverse toughness, longitudinal toughness, low-temperature dynamic tear resistance, weldability, strain resistance and also acid tool rust resistance of submarine pipe steel.
offshore pipe laying
The longest overseas pipeline in the world is the Langeled natural gas pipeline, which was laid between Norway and also Causation from 2004 to 2007, with a size of 1173km as well as the inmost factor is 2775m. below are offshore pipeline engineering recently:
On May 23, 2020, the sea pipeline of the Lingshui 17-2 job, China's initial deepwater gas area, was successfully laid at 1,532 meters, damaging China's new document for sea pipe laying and also the very first operation at 1,500 meters of "ultra-deepwater". The task used greater than 10,000 tons of undersea steel pipeline from Henggang, Hunan district. The simulation experiments of the exterior pressure of these deep-sea pipes show that the steel tube can endure 35Mpa as well as can be made use of for outside stress above 35m water deepness.
The deepwater steel pipeline is defined by huge wall thickness relative to external size ratio, high dimensional precision, and so on. This is because the submarine pipeline has been in service in the marine atmosphere of low temperature level, high stress as well as solid rust for a long period of time. It not only births a tons of interior as well as exterior pressure, axial pressure and flexing moment yet also bears the vibrant lots of rotating external pressure, wave and also existing. The stamina, wall density, and dimension satiation of steel pipe are especially essential to avoid pipe damage. Meanwhile, with the continuous boost of pipe laying depth as well as communicating stress, high steel quality, large pipeline size, and also large wall density are the growth fad for the offshore pipeline.