Pieces of pipe are welded together in the tower and lowered vertically in to the seabed (Fig. A vessel with a vertical J-lay tower is required. The J-Lay method is used for pipelines with diameter from 10-50” in deep and ultra deep waters. Preheating for applying the field joint coating.Installation depth resticted on vessel tension capacity Pipelaying in detail Many experiece contractors and economical aspects Disadvantages: Several production stations (welding, NDT, field joint coating): 6-10 stations Long vessels with large pipe storage capacities Wide range of pipeline diameters: 4″ – 60″ OD With the completion of the vessel Pioneering Spirit (2000t tension force) from Allseas, S-lay will be possible for pipelines with OD of 68” Vessel Name S-Lay is currently used for pipelines with diameter from 10 to 30” in waterdepth up to 2500 m (1000t tension force). the main fire line 5.the tensioners, 6.the stinger The layout of an S-lay vessel is shown below. The pipeline from the vessel to the seabed takes an S-shape that is why we call the method S-Lay. This type of installation requires an S-Lay vessel, which is basically a floating welding factory, where pieces of 12 m long pipes are continuously joint and lowered to the seabed. The pipeline from the vessel to the seabed takes an S-shape that why we call the method S-Lay For this type of installation requires an S-Lay vessel, which is basically a floating welding factory, where pieces of 12 m long pipes joint to form the pipeline and lowered to the seabed (Fig. The S-Lay method is used for pipelines with diameters from 10 to 30” in water up to 5000 m.
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