Bundle Pipeline Installation Technique for a Curved Route

초록

The pipeline consists of two 30 inch gas lines with 17.5 mm wall thickness and 70 mm weight coating. In the 3,007 m entire offshore route, around 1,000 m was curved with 1,400 m radius. The maximum water depth reaches up to 34 meter from mean sea water level. The construction area is characterized with 7.5 m tidal range with more than 4 knots current. The horizontal stability against strong current was gained in the trench, however the vertical stability was secured with specially engineered guide rollers were designed and installed at various spaces which satisfied the allowable stress of pipeline. The location of subsea piles were decided with FEM analysis. The reaction force for each pile from the analysis was applied in the design of subsea piles. Detailed investigations on the subsea pile space and quantity were conducted in the engineering phase. The diameter and penetration depth and design of bundled pipelines with key aspects on curved sectin are discussed with the applied installation method.