A Pipe-in-Pipe Buckle Stopper Based on Toothed Section Deformation Elements

Abstract

The invention relates to a pipe-in-pipe buckle arrestor based on a dentate section deformation element. The pipe-in-pipe buckle arrestor is characterized in that the dentate section deformation element is added between an inner pipe and an outer pipe of a pipe-in-pipe. The dentate section deformation element is buckled in the bending deformation process of the pipeline, so that the relative movement of the inner pipe and the outer pipe is prevented from becoming larger, and meanwhile, the function of resisting internal pressure is achieved. According to the pipe-in-pipe buckle arrestor composed of the dentate section deformation element and a plastic shell, the size of the pipe-in-pipe needs not be changed. The pipe-in-pipe buckle arrestor is directly installed between the inner pipe and the outer pipe, and a thermal insulation device of the pipe-in-pipe is not influenced. The buckle arrestor has further universality, and can be cut specific to pipe-in-pipes with different sizes. In addition, the buckle arrestor can be directly installed on the outer pipe by a pipe-in-pipe manufacturer. The heat insulation property of the buckle arrestor can be further improved by selecting the plastic shell made of a heat insulation material. According to the pipe-in-pipe buckle arrestor, buckling and buckling propagation of the deepwater pipe-in-pipe in storage, installation and running can be prevented, so that the installation and buckle arresting efficiency of the deepwater pipe-in-pipe is improved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of laying submarine pipeline facilities, and in particular relates to a method capable of preventing buckling propagation of submarine pipelines. Background technique [0002] With the increasing demand for oil and gas resources in countries all over the world, the development of submarine pipelines has become an irresistible trend. At the same time, there are many problems that need to be solved urgently in the design, construction and operation of submarine pipelines. The most prominent problem is the buckling of pipelines. The main reasons for buckling are: the joint action of elbows and external hydrostatic pressure, local depressions caused by collisions with other objects, and excessive bending during installation and use. Because the buckling propagation pressure is less than the local buckling pressure, once the local buckling instability occurs in the pipeline, the buckling will propagate along its ...

AI Technical Summary

Problems solved by technology

However, when the pipe is pipe-in-pipe, the diameter increase on the outer pipe is unacceptable due to shipping and storage factors

[0011] Although the welded buckle arrester has a better buckle arrest effect than the snap-in type after welding, it is also prone to welding defects and stress concentration due to the existence of the weld seam

Integral buckle arrester with good buckling effect is suitable for deep water pipelines, but the welding process is more complicated, there are problems of weld stress concentration and welding defects caused by welding, and the economic cost is also higher than that of buckle-in buckle arrester device

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