An offshore pipeline is a pipe laid on, or below, the seabed. They transport oil or gas to long distances. While pipelines transfer resources to the shore, an infield pipeline connects subsea wellheads, manifolds, and the platform to a development field.
Offshore pipeline construction projects require planning and considering many topographical factors, as well as offshore ecology and ecological loading. Large-scale projects particularly, are undertaken by international teams.
One of the first main offshore pipeline projects was Operation PLUTO. It was built amongst the Isle of Wight and France through World War II and stretched 48 km. This was an operation by oil companies, British engineers and the armed forces of Britain
Browse detailed – Offshore Pipeline Market Revenue Estimation and Growth Forecast Report
The Construction Process of Offshore Pipeline
Before an offshore pipeline can be laid, there is a need for a seabed survey for obstacles and for ensuring there are no ecological issues with the site. Once the seabed is cleared, the pipes are joined, tested for faults and painted.
Numerous approaches can be put to use for installing pipes on the seabed. With a tow-in fitting, sections of pipeline are attached to markers and dragged out to sea. The buoys are then detached and the pipe sinks to the seabed.
With an S-Lay Fitting, large ships lower the welded pipes onto the seabed over a ‘stinger’ that juts out water in an s-shape. With a J-Lay fitting, the pipes are eased off the ship deck at a vertical angle, which forms a j-shape.
Each pipe weighs more than a few tonnes so they are ’re laid in trenches and in some locations, secured with residue from the seabed for further security.
Upon the installation of pipes on the seabed, a part is drawn onshore with a winch. The pipes are then linked to the onshore section and a tie-in is constructed.
With the whole pipeline in place, hydro testing is done, where pipe has water to check for defects. The pipeline condition is also monitored using with electronic devices.
Coming to a Conclusion
Due to the rising demand for oil and gas all over the world, the demand for offshore pipeline is on the rise, and it will reach USD 18,716 million by 2030.
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