Inside surface plastic-coated steel pipeline crater anticorrosion treatment method

Abstract

The invention discloses an inside surface plastic-coated steel pipeline crater anticorrosion treatment method and belongs to the technical field of pipeline connection construction crater anticorrosion. The method comprises the following construction steps of blanking cutting of an inside surface plastic-coated pipeline and a stainless steel pipe section; polishing of a pipe orifice and treatmentof an anticorrosive layer; assembling of pipelines; welding of the pipelines; and anticorrosion treatment of a crater. In order to ensure the welding quality and the anticorrosive layer of the craterand a welding seam, the pipe orifice needs to be subjected to groove polishing and anticorrosive layer treatment, and the anticorrosive layer in the inside surface plastic-coated pipeline is cut and scraped off at the same time, so that the inside surface plastic-coated pipeline cannot deform caused by welding and being heated; and the welding process needs to be continuously performed, after welding of the pipeline crater is finished, the welding seam is cleaned, PE powder is coated and scattered and is melted by utilizing residual heat produced during pipeline welding, and the welded pipeline is rotated to form a layer of uniform PE anticorrosive layer. The inside surface plastic-coated steel pipeline crater anticorrosion treatment method is mainly suitable for connection of inside surface plastic-coated PE composite pipes and adopts effective transition connection with addition of a stainless steel short section under the condition that a fixed length of the pipeline is not satisfied, so that the PE anticorrosive layer is ensured to form at the crate on the inner wall of the pipeline, and the anticorrosion performance and the water quality of the pipeline are strongly guaranteed.

Description

technical field [0001] The invention belongs to the technical field of pipeline installation and construction, and in particular provides a method for anti-corrosion treatment of plastic-coated steel pipeline welding joints. The material PE is used for anti-corrosion treatment of pipeline welds, which is suitable for the welding of plastic-coated steel pipelines after welding. The construction of anti-corrosion treatment engineering can improve the anti-corrosion ability of the inner wall of the pipeline after anti-corrosion treatment, prevent secondary pollution of water bodies, and thus meet the requirements of water quality standards. Background technique [0002] In pipeline construction, the anti-corrosion treatment inside the weld seam is a difficult problem that is often encountered. There are stainless steel short joints attached to both ends of the plastic-coated steel pipes. After the manufacturer has cut and shaped them, they will be cut and blanked during the ins...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for anti-corrosion treatment of plastic-coated steel pipe weld joints, which solves the internal anti-corrosion problem of plastic-coated welded pipes, and uses the waste heat during welding to internally coat the weld joints of the pipes with a PE anti-corrosion layer to ensure that the pipes are protected against corrosion. Internal corrosion protection at the weld

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