Lining stainless steel composite steel pipe and preparation method

Abstract

The invention discloses a lining stainless steel composite steel pipe. The lining stainless steel composite steel pipe comprises a steel pipe base body, a stainless steel lining and a stainless steelsealing plate. Face flanges are correspondingly welded to openings of two ends of the steel pipe base body, and stainless steel radian plates are embedded and welded to planes of the face flanges; a plurality of drilling holes are formed in the stainless steel lining and formed in the pipe wall of the inner side of the steel pipe base body, and the ends, close to the face flanges are welded to thestainless steel radian plates on the face flanges; and the stainless steel sealing plate is sealed on the drilling holes of the stainless steel lining, and the stainless steel lining is welded to thesteel pipe base body through the stainless steel sealing plate. The invention further provides a preparation method of the lining stainless steel composite steel pipe. Large-diameter lining rubber pipes are changed into lining stainless steel plates, the reliability of pipelines can be improved, the operation and maintenance costs are reduced, and the service life of the pipelines is effectivelyprolonged.

Description

technical field [0001] The invention relates to the field of pipe materials, in particular to a stainless steel-lined composite steel pipe and a preparation method thereof. Background technique [0002] At present, desulfurization in power stations and large-capacity pipelines in chemical companies use rubber-lined pipelines to transport corrosive media. Some of the media are still abrasive. These rubber linings are aging during service. Each time they are put into operation for 3 to 5 years, the pipelines need to be returned. Professional rubber lining enterprises re-line rubber, and the peeled rubber lining often blocks pipes, valves, pump inlets, etc., which can easily cause sudden abnormal operation of environmental protection equipment. These large-diameter rubber-lined pipes are generally pipelines on important equipment. Once leakage occurs, it is difficult to effectively deal with it. After the rubber liner falls off, the part of the rubber-lined pipe that is missing...

AI Technical Summary

Problems solved by technology

[0002] At present, desulfurization in power stations and large-capacity pipelines in chemical companies use rubber-lined pipelines to transport corrosive media. Some of the media are still abrasive. These rubber linings are aging during service. Each time they are put into operation for 3 to 5 years, the pipelines need to be returned. Professional rubber lining companies re-line rubber, and the peeled rubber lining often blocks pipes, valves, pump inlets, etc., which can easily cause sudden abnormal operation of environmental protection equipment

These large-diameter rubber-lined pipes are generally pipelines on important equipment. Once a leak occurs, it is difficult to deal with it effectively. After the rubber liner falls off, the part of the rubber-lined pipe that is missing the rubber-lined protection will be corroded and perforated by the slurry, and then leak.

Such defects cannot be repaired, otherwise high temperature will be generated due to welding, which will damage more rubber lining and cause a larger area of ​​rubber lining to fall off

Therefore, temporary plugging measures can only be taken for such defects, and the pipeline is removed after the shutdown. Because the rubber lining needs to be vulcanized at high temperature, the rubber lining can be firmly bonded to the iron pipe wall, and the pipeline lining cannot be restored by on-site treatment. Glue can only be returned to the factory for re-lining and reinstalling, which consumes a lot of manpower and material resources

When the corrosion is serious, it will even affect the operation of the main equipment

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