A new repair method for steel epoxy sleeve

Abstract

The invention discloses a new method for repairing steel epoxy sleeves. Firstly, epoxy resin is poured into thin-walled steel pipes to form epoxy particle tubes, and then the epoxy particle tubes are installed on both ends according to the closest arrangement. In the chamfered sleeve, put the sleeve on the vibration table to shatter the epoxy resin, and finally control the temperature around the tube body to form an interference fit between the sleeve and the tube body, thereby fixing the sleeve on the tube body . The benefits of the present invention are: (1) the epoxy resin in the sleeve exists in the form of particles, and is filled in thin-walled steel pipes one by one, and the epoxy resin no longer exists in a large plate-like structure, so it does not Brittle cracking will occur, thereby avoiding the possibility of steel epoxy sleeve being damaged due to brittle cracking of epoxy resin, and significantly improving the bending resistance and impact resistance of large-diameter pipes; (2) the sleeve passes through the Ying fit is installed on the pipe body, and there is no need to use epoxy resin to seal the two ends of the sleeve, which is convenient to operate, easy to implement, and saves time and effort.

Description

technical field [0001] The invention relates to a method for repairing a large-diameter pipeline, in particular to a new method for repairing a steel epoxy sleeve that can make a large-diameter pipeline have better bending resistance and impact resistance, and belongs to the technical field of pipeline repair . Background technique [0002] Existing high-grade and large-diameter transmission pipelines have an increasing demand for repairing defects, while the shortcomings of traditional pipeline defect repairing technologies are becoming increasingly apparent. [0003] There are four main types of pipe body defects: metal loss, cracks, deformation, and weld defects. Generally, in the process of pipeline operation, the existence of girth weld defects is the most harmful to pipeline operation, so it is very necessary to study the repair methods and processes of girth weld defects. [0004] At present, the common defect repair methods in China include: repair welding, patch r...

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Problems solved by technology

[0007] (1) During the welding process, it is necessary to stop the oil and gas transmission;

[0008] (2) During the welding process, due to the existence of welding heat, it is easy to cause danger to flammable and explosive oil and gas pipelines;

[0011] Compared with the repair of B-type sleeve, the steel epoxy sleeve has greatly improved the repair of girth weld defects. For example, no welding process is required, and hydrogen embrittlement will not occur. However, due to the steel epoxy sleeve and The pipe body is sealed by epoxy resin, and the condensed epoxy resin is highly brittle, so when the pipe undergoes a large deformation or is subjected to severe impact, the epoxy resin is likely to be brittle and cracked. The steel epoxy sleeve is likely to be damaged, which will have a huge impact on the overall performance of the pipeline (including: bending resistance, impact resistance)

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