On the design of integral buckle arrestors for offshore pipelines

A common method of limiting the extent of damage induced by a propagating buckle to a deep water pipeline is to periodically install along the line thick rings welded between adjacent strings of the pipe (integral buckle arrestor). The rings locally increase the resistance to collapse and, when properly designed, arrest an incoming buckle. The effectiveness of this type of local reinforcement as a buckle arrestor was studied through a series of full-scale experiments and through a numerical model. The model was first proven to be capable of accurately simulating the quasi-static crossing of such arrestors by a buckle and was then used to study the arresting efficiency of this device as a function of the pipe and arrestor geometric and material parameters. This paper briefly summarizes these results which are subsequently used to establish some bounds for the arrestor thickness and length and to develop empirical design formulae for such devices.

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