Study examines causes of upheaval buckling in shallow subsea PIP lines

Temperature, initial slope imperfections, and downward restraints on a pipeline all affect its propensity for upheaval buckling. A restrained pipeline is subject to compressive loads as the temperature of the transported medium rises.A pipeline laid on the seabed is likely to experience lateral buckling. Partially or fully burying the pipeline restrains it laterally in the horizontal plane, but upheaval buckling is likely where initial imperfections of the seabed exist.Hobbs derived analytical solutions for the buckling and post-buckling behavior of a heated pipeline assuming a buckling curve for the pipeline.1 Hobbs established the relationship between the buckling temperature and length...

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