Observable pipeline inner wall cathodic protection device

Abstract

The invention belongs to an anti-corrosion protection device for the inner wall of a liquid conveying pipeline, in particular to an observable cathodic protection device for the inner wall of a pipeline. The center of the upper cover of the lower connecting flange is provided with a through hole. The upper cover is connected to the upper opening of the upper chamber through the lower connecting flange. The upper end of the rod protrudes from the through hole of the upper cover, and the central rod is sealed with the through hole of the upper cover through the packing. One end of the conductive cable is connected with the upper end of the central rod, and the other end is connected with the lower chamber. The pressure relief cock is installed on the pipe wall of the chamber, and the lower chamber is fixedly connected with the pipe and connected with each other through through holes. The invention has a novel structure, not only has the cathodic protection function of preventing and slowing down the corrosion of the inner wall of the pipeline, but also has the function of inspecting and replacing the anode block when the pipeline does not stop running, and can continuously monitor the corrosion rate of the pipeline.

Description

technical field [0001] The invention belongs to an anti-corrosion protection device for the inner wall of a liquid conveying pipeline, in particular to an observable cathodic protection device for the inner wall of the pipeline. Background technique [0002] At present, the steel metal pipes used in the petrochemical industry and urban water supply (heating) are usually only anti-corrosion on the outer wall, but the corrosion damage to the pipeline by the medium transported by the pipeline is becoming more and more prominent, and the prevention and treatment of the corrosion on the inner wall of the pipeline has become particularly important , The plastic-coated steel pipe industry has developed from the earliest inner and outer polyethylene, due to adhesion problems, to inner and outer epoxy, but the outer epoxy layer is not resistant to bumps, and later developed to the third generation of inner epoxy outer polyethylene, but single-layer polyethylene Directly combined with...

AI Technical Summary

Problems solved by technology

Existing problems: Since the cathodic protection device is installed outside the pipeline, the anode block is located outside the pipeline. In the environment of electrochemical corrosion, the anode block, pipeline and soil form an ion transfer system. The system has no flow medium with the inside of the pipeline. Therefore, the cathodic protection system can only provide anti-corrosion protection for the outer wall of the buried pipeline, but cannot protect the inner wall of the pipeline for anti-corrosion protection.

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