Transition joint for connection of thin-walled lining steel pipeline and blind plate

Abstract

The invention discloses a transition joint for connection of a thin-walled lining steel pipeline. The transition joint comprises a first pipe part, a second pipe part and a third pipe part, wherein the first pipe part, the second pipe part and the third pipe part are sequentially welded. The first pipe part is welded and fixed to the pipeline. The third pipe part is fixed to a blind plate. The inner diameters of the first pipe part, the second pipe part and the third pipe part are all the same as the inner diameter of the pipeline. The wall thicknesses of the first pipe part, the second pipe part and the third pipe part are sequentially increased, a step structure is formed, the wall thickness of the first pipe part is larger than that of the pipeline, and the outer diameter of the third pipe part is smaller than that of the blind plate. Compared with the prior art, the transition joint for connection of the thin-walled lining steel pipeline and the blind plate has the following beneficial effects that by means of the transition joint, the weld joint quality problem generated due to the fact that an existing thin-walled steel lining pipe and the blind plate are directly welded is solved, the problem that the medium running pressure cannot be borne is solved, the welded junction quality is ensured, meanwhile, the welded junction stress is uniform, and therefore the pipeline can bear the medium running pressure.

Description

technical field [0001] The invention belongs to the field of stainless steel pipes, and in particular relates to a transition joint connecting a thin-wall lined steel pipe with a blind plate. Background technique [0002] Underground pipeline is one of the important projects in my country's economic construction. In the 60 years since the founding of the People's Republic of China, more than 380,000 kilometers of underground water supply pipelines have been laid, most of which have reached the end of their service period, and some have found that the water supply leakage rate has reached about 20%. These underground pipelines urgently need to be updated and repaired. At present, with the development of the economy, the scale of domestic cities is getting larger and larger, and the demand for water transportation and drainage is also increasing. Many water supply and drainage pipes in the city have been in disrepair for a long time and have serious water leakage. Some of the...

AI Technical Summary

Problems solved by technology

However, in order to ensure the water delivery capacity, both stainless steel and steel pipes are lined with thin-walled pipes, so the welding joints directly connected between the thin-walled pipes and the blind plate are relatively fragile and cannot withstand the operating pressure of the medium

At present, there is no professional method at home and abroad to deal with the quality of the weld seam at the direct connection between the thin-walled steel pipe and the blind plate

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