Allseas lays pipe using the S-lay method. The term S-lay refers to the shape that the pipe forms between the vessel and the seabed as it is laid. The method is characterised by its fast installation process and its workability over a large range of water depths.
On board the pipelay vessel, pipe joints are assembled in a horizontal working plane (the firing line). Pipe joints are welded together, inspected and then coated as they move through the various firing line work stations. As welding progresses, the pipeline is gradually lowered towards the seabed behind the vessel.
During pipelay, the curvature of the upper section of the pipeline (the overbend) is controlled by the stinger, a steel structure with rollers protruding from the end of the firing line to prevent pipe buckling (failure). The curvature in the lower section (the sagbend) of the pipeline is controlled by pipe tensioners, caterpillar tracks that clamp the pipe. The amount of tension is one of the most important limiting factors in the capabilities of an S-lay vessel.
After a pipeline has been laid, and the system has been tested and commissioned, the client can transport oil or gas through it.
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