A pipe-laying ship is a maritime vessel used in the construction of subsea infrastructure. It serves to connect oil production platforms with refineries onshore. To accomplish this goal a typical pipelaying vessel carries a heavy lift crane, used to install pumps and valves, and equipment to lay pipe between subsea structures.
Lay methods consist of J-lay and S-lay and can be reel-lay or welded length by length. Pipelaying ships make use of dynamic positioning systems or anchor spreads to maintain the correct position and speed while laying the pipe.
Recent advances have been made, with the pipe being laid in water depths of more than 2,500 meters.
The term “pipe-laying vessel” or “pipelayer” refers to all vessels capable of laying pipe on the ocean floor. It can also refer to “dual activity” ships. These vessels are capable of laying pipe on the ocean floor in addition to their primary job. Examples of dual activity pipelayers include barges, modified bulk carriers, modified drillships semi-immersible laying vessels among others.
A number of national oil companies own and operate pipe-laying barges for offshore oil projects. HYSY 202 was the first pipe laying barge to be built in China.
- “Offshore Pipelayers”.
- “[New Record] World Largest Modified Semi-Submersible Vessel”Innovation Way” Float-On China first independently Designed Pipe Laying Barge”. CCCC International Shipping Corporation. 26 October 2018. Archived from the original on 8 January 2019. Retrieved 8 January 2019.
- A.C. Palmer, R.A. King (2008) Subsea Pipeline Engineering, PennWell Books.