New method sets concrete coating’s effect on pipeline stiffness, stress

Alexander Aynbinder, Technip USA, HoustonThe thickness of concrete coating on a large-diameter offshore pipeline may be up to eight times the wall thickness of its steel pipe, requiring that its effects on the stiffness, stresses, and strains of the line as a whole be understood as precisely as possible.Concrete coating of offshore pipes increases a pipeline’s specific gravity, ensuring that on-bottom stability is not affected by environmental loads. One existing calculation procedure, used in calculating stresses and deflections, assumes the external concrete coating increases the weight but does not contribute to bending stiffness. The other current method considers the effective ...

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