Two-section type inter-anticorrosion-mouth-repair-free dead-mouth tie-in method for steel pipelines

Abstract

The invention relates to a two-stage method for repairing dead ports and joints without internal anti-corrosion for steel pipelines. The method includes the following steps: (1) Processing steps of connecting short pipes: (1) Cutting two sections of short steel pipes according to the steel pipe specifications specified in the design; (2) Surfacing stainless steel material on the inner wall circumference of the pipe end by a surfacing machine; (3) Lathe Process the anti-corrosion alloy pre-filling layer and the bevel at both ends of the short pipe; (2) The steps of connecting the dead ends of the pipeline on site: respectively weld the non-surfacing end of the short pipe to the pipes at both ends; After the anti-corrosion filling treatment, use the same welding material as the pre-filling welding to weld the dead seam. The beneficial effects are: the present invention can realize the elimination of internal anti-corrosion repairing of steel pipe dead ends through two sections of pre-welding surfacing welding short pipes, solves the technical bottleneck of internal anti-corrosion repairing of pipe dead ends, and simplifies the connection of internal anti-corrosion pipeline dead ends. The head process reduces the construction cost of the internal anti-corrosion steel pipe dead end connection.

Description

technical field [0001] The invention relates to the field of steel pipelines, in particular to a two-stage steel pipeline-free internal anti-corrosion mending dead joint connection method. Background technique [0002] In order to avoid the corrosion of the conveying medium to the steel pipeline, it is necessary to carry out industrial anti-corrosion treatment on the inner wall of the steel pipe. Since the heat input of the pipeline welding will cause the damage of the anti-corrosion coating in the weld joint area, after the on-site welding construction, it is necessary to enter the interior of the pipeline manually or by equipment Anti-corrosion treatment is carried out on the inner wall of the welding joint. This process is called internal anti-corrosion repairing of the welding joint; pipeline welding joints that cannot be repaired internally by equipment or manually are called "pipeline dead joints"; [0003] Through pipe fittings such as elbows, tees or short pipes, or ...

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Problems solved by technology

[0006] The above invention adopts three prefabricated pup joints, and there are 4 welding seams in the on-site connection, two of which ar

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