Flange-free plastic coated pipeline

Abstract

The invention discloses a flange-free connected plastic coated pipeline. A steel tube of the plastic coated pipeline uses a carbon steel tube as a body and comprises stainless steel connectors, a butt welding seam, a lining plastic layer, lining plastic positioning rings and a scene butt welding seam. The stainless steel connectors are arranged at two ends of the main body carbon steel tube in a butt welding mode and used for connecting other pipelines; the lining plastic layer which is provided with an anti-corrosion effect are attached to inner wall of the carbon steel tube, and the lining plastic positioning rings are arranged at two ends of the lining plastic layer respectively. The flange-free plastic coated pipeline has the advantages that the pipeline can be connected without a flange and has mechanical strength of the whole steel tube and corrosion resistance of plastics; and when the flange-free plastic coated pipeline is compared with existing pipelines, anticorrosion blind spots are effectively eliminated, stable and reliable product qualities can be guaranteed, and the construction is convenient and rapid.

Description

technical field [0001] The invention relates to the field of pipelines, in particular to a plastic-coated composite steel pipe without flange connections. Background technique [0002] As we all know, traditional plastic-coated steel pipes are mostly connected by flanges. Rubber sealing gaskets are generally used for the sealing of the flange joint surface, which requires high technical requirements and slow speed for construction and installation, and it is difficult to realize the production of standardized spare parts pipelines due to the construction of the position and angle of the flange connection holes. Especially due to the poor aging resistance and short service life of rubber sealing gaskets, they generally need to be replaced once every 2-3 years, which is labor-intensive and time-consuming, especially for the maintenance and replacement of buried pipelines and high-altitude pipelines. The existing technologies all try to use welding to replace the traditional f...

AI Technical Summary

Problems solved by technology

Compared with Bulletin No. 2842129 "welded plastic-coated steel pipe", although this scheme has improved the alignment requirements of on-site welding, it still has the same difficulties

The technical requirements for the flanging of the stainless steel sleeve are relatively high, and the construction is difficult; especially according to the description of this plan, electrodes of different materials are still required for welding, and due to the influence of the flanging, there is a possibility of reducing the effective wall thickness of the welding place , reducing the risk of overall pipeline strength

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