Abstract
Pipelines are one of the most important and key elements that align with transferring hydrocarbon products in coastal and offshore industries which are exposed at various risks during their servicing. In this project, we are studding and describing free spanning of marine pipeline based on DNVGL-RP-F-105 regulation applying the finite element method by Abaqus software. For modeling, case studies of Gorze to Kish oil pipeline have been used. In order to provide and study the integrity of the structure against fatigue, the exact place as well as the free span length using software under environmental loading based on DNVGL-RP-F205 has been determined. Since based on DNVGL-TS-F101 free span causes local buckling, fatigue, and pipe burst then given to the servicing as well as environmental conditions, pipe condition has been monitored. Finally, using sensitivity analysis, the effect of different soil classes, elasticity module, and temperature on the pipe condition has been studied. At the end, the question if it is allowed to use a cross model for bed has been answered in previous studies.
Highlights
Marine pipelines are used to align with transferring gas and oil products under the sea water
Increasing demand for oil and gas with expansion of industry and, deficiency of fossil sources of energy causes offshore projects to develop dramatically to discover, extraction, and hydrocarbon transfer. e first marine pipe line to transfer fuel for the Second World War was the PULTO project which was installed using a ship and a large spool, a small diameter pipe between Europe and Britain with a gun. e first offshore pipeline was installed in the Gulf of Mexico
Iran as one of the countries which is located at this sensitive region has great, in Asalouyeh gas field, Oman Sea, etc., oil productions that this issue can be understood well, Figure 1
Summary
Marine pipelines are used to align with transferring gas and oil products under the sea water. Determining the natural frequency of a marine pipeline at the free span state and effective parameters on it were studied by Yaghubi, Mazaheri, and Jabari [5] in 2011. The natural frequency of the marine pipeline was calculated analytically and the effect of pipe mass, axial force, soil type, and friction between the pipe and soil parameters was assessed at different support conditions so that the effect of each parameter on the natural frequency of free span in different lengths and soils can be seen [6]. Using finite element modeling and taking into account a linear model for soil behavior, soil behavior against vortex flow has been predicated [9]
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