A buckle stopper for deep water pipes based on C-shaped cross-section deformation elements

Abstract

The invention belongs to the technical field of submarine pipeline laying and relates to a deepwater pipe-in-pipe buckle arrestor based on C-shaped section deformation elements. The Deepwater pipe-in-pipe buckle arrestor based on the C-shaped section deformation elements is characterized in that the C-shaped section deformation elements are additionally arranged between an inner pipe and an outer pipe of a pipe-in-pipe structure. The C-shaped section deformation elements are buckled so as to prevent increase of relative movement of the inner pipe and the outer pipe during buckling deformation of a pipeline and can achieve the function of resisting internal pressure. The pipe-in-pipe buckle arrestor composed of the C-shaped section deformation elements, a plastic shell and space rings is directly mounted between the inner pipe and the outer pipe without changing the pipe-in-pipe size and affecting a thermal insulation device in the pipe-in-pipe structure. The buckle arrestor is universal and can be cut according to pipe-in-pipe structures with different sizes and directly mounted on the outer pipe, and the thermal insulation property of the buckle arrestor can be improved by means of the plastic shell made of a thermal insulation material. By means of the deepwater pipe-in-pipe buckle arrestor based on the C-shaped section deformation elements, buckling and buckling propagation of the deepwater pipe-in-pipe structure during storage, installation and operation can be prevented, the installation efficiency and buckle arresting efficiency of the deepwater pipe-in-pipe structure are improved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of submarine pipeline laying, and relates to a buckle arrester for deep-water pipes based on C-shaped section deformation elements. 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 length at a sp...

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

Images