S-Lay
The S-Lay is a method for laying pipelines in bodies of water. The laying of these pipelines is carried out by means of specially equipped pipelayers , which belong to the class of work boats . The method got its name by the characteristic S -shaped curve of the pipeline while laying (engl. Lay (ing) ).
In contrast to the J-Lay , the S-Lay process is optimized for low and medium (so-called shallow and medium ) water depths due to the high holding force required , although the world record was achieved for the deepest pipeline ever laid in the S-Lay. The laying depth was 2775 meters (m) water depth. However, the laying performance is higher than that of the J-Lay, where up to 9000 m per day was achieved.
Modifications of the process are currently attempting to combine the advantages of both processes in order to achieve the ideal combination of performance and possible depth.
Laying method
The multi-layer plastic coated pipeline segments, which are typically 40 feet long, are typically chamfered in prep stations to prepare them for welding . In the welding station, the segments are turned into pipe pieces that can consist of up to four individual pieces, which is why they are also called quadruple joints or quadjoints . The maximum length of such a segment is then up to 48.8 m. These long pieces of pipe are then welded together horizontally and then checked non-destructively by X-rays. The weld seam is then given a multilayer plastic coating to increase corrosion protection.
After the coating has been completed, the pipeline segment is pushed backwards out of the ship and guided over the “stinger”, which provides support forces, which results in the S-shaped course that is characteristic of this process under the weight of the section of the pipeline that is not yet lying down and its flexural strength . At the beginning of the laying, the pipeline - which is closed at the beginning - is either pulled by a tug against the laying direction or simply laid on the ground.
See also
Web links
- Animation of the S-Lay procedure using the example of the Castoro Sei on Ronsrovlinks (viewed on June 22, 2011)
Individual evidence
- ↑ Report on Marinebuzz about the Solitaire (accessed May 31, 2010)
- ↑ Data on the Blue Stream and the pipelines on the Saipem website (English, PDF file, 6.13 MB, accessed on October 6, 2009) ( Memento of the original from April 24, 2009 in the Internet Archive ) Info: Der Archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
