Annular sealing connection method of lining pipeline

Abstract

An annulus sealing connection method for a lined pipeline. It is characterized in that an annular coupling is pre-welded at the nozzle, and a hole is opened on the upper surface of the coupling at the horizontal axis position, and then made of glass fiber reinforced plastic or coating lining. At the construction site, first apply a special adhesive on the end face of the lining pipe and the inner wall of the centralizing joint, and then coat the centralizing joint on the ends of the two connected lining pipes. The end faces of the two lining pipes should be close to the centralizing joint On the butt joint end face of the annular coupling, weld the butt weld of the annular coupling; then pressurize and inject special sealant into the annular gap through the opening of one annular coupling, and when the opening of the other annular coupling When the sealant overflows, screw the bolts into the two holes and weld them well. The invention has the advantages of changing the direct welding at the pipe mouth to the collar welding outside the pipe, avoiding the damage to the lining caused by welding high temperature, simple design, quick construction, good sealing effect, reliable quality, and long-term safe operation of the pipeline.

Description

technical field [0001] The invention relates to an annulus sealing connection method for surface oil and water gathering and transportation lining pipelines. Background technique [0002] In order to achieve long-term safe operation of surface oil and water gathering and transportation pipelines, there must be good basic conditions in five aspects, namely reasonable anti-corrosion measures, excellent connections, normal and balanced operation, strong ability to resist natural damage and perfect maintenance management system. At present, among the causes of various destructive accidents in pipelines at home and abroad, the damage caused by human beings takes the first place, and the corrosion damage of pipelines takes the second place. [0003] In order to prevent corrosion and perforation of the ground pipeline network, some pipelines currently use FRP lining or coating technology to isolate the corrosive medium from the steel body, but the bottleneck of pipeline lining ant...

AI Technical Summary

Problems solved by technology

But the joint welding temperature is as high as thousands of degrees, no matter what kind of lining it is, it will be cracked and damaged, and the welded joint becomes a bare pipe, and the lined steel pipe forms a small anode and a large cathode, and its corrosion rate is faster than that of a bare pipe without anti-corrosion coating , the entire pipeline will lose its anti-corrosion ability in a very short time

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