Construction of an underwater pipeline by Medgaz (Algeria gas pipeline Spain Europe)
The offshore pipeline will be built using a "Lay Barge". This is to use a boat or a mobile platform in which the tubes are welded before being placed at the bottom of the sea.
There are two methods for this type of facility, "S-lay" and "J-lay". The first can be applied both in the shallow areas in very deep zones (up to 2.500 meters). These weld and lay the pipes in a horizontal position, like so the pipeline will take a shape "S" at the exit of the boat to the point where it rests on the seabed.
The "J-lay" involves welding of upright tubes. It is only used for depths between 400 and 3.500 meters, depending on the tube diameter. While the platform advance the pipeline plunge in the form of offshore vertical "J" from the point of launch to the bottom.
MEDGAZ will use both systems for the construction of the pipeline in very deep waters. Following we describe the J-lay ...
More: the Medgaz pipeline in the Mediterranean