Method of protecting corrosion proof pipeline joint internal wall using sacrificing anode

Abstract

A method for protecting the inner surface of anticorrosion pipeline jointer by use of sacrificial anode features that the Al-Zn-Mg alloy ring used as the sacrificial anode is fixed to one or two ends of a steel pipe and then welded by existing welding technology.

Description

technical field [0001] The invention relates to a method for protecting the inner wall of an anti-corrosion pipeline joint by using a sacrificial anode, which belongs to the improvement of the metal pipeline anti-corrosion technology. It mainly uses special sacrificial anodes and metal pipes to be anti-corrosion to form a specific anti-corrosion system, thereby avoiding the corrosion of the inner wall of the metal pipe and the repairing process of the metal pipe after welding. The method is suitable for the anticorrosion treatment of the inner wall of the welding joint of steel pipelines with anticorrosion coatings in petroleum and petrochemical industries, as well as medium and small diameter pipelines coated with organic coatings or inorganic coatings, and has the characteristics of low cost, simple construction and reliable performance. Background technique [0002] In the petroleum and petrochemical industries, the corrosion of metal pipelines is extremely serious. There...

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Problems solved by technology

Memory alloy casing jointing method, mechanical connection method and liner welding method have high requirements on field equipment and are highly dependent on equipment quality, it is difficult to guarantee the reliability of joint jointing, and there are few applications at present

In the past two years, the automatic paint jointing machine in the pipe has been widely used, but there are also obvious deficiencies, such as: for medium and small diameter pipelines, especially small diameter welding joints, the joint repairing trolley cannot enter; the bending and elbow welding areas cannot be performed Coating; during on-site construction, mud and sand blockages make it difficult to mend the joint; during on-site emergency repairs, it is impossible to perform internal mending after welding

The stainless steel collar technology is used for bottom welding, due to the existence of the stainless steel ring, it becomes the welding of composite steel, which is difficult to weld and the quality is not easy to guarantee

[0011] In the petroleum industry, the problem of internal jointing of anti-corrosion coatings in oilfield pipelines after welding has not been effectively solved. On the one hand, the promotion of new anti-corrosion coatings is limited; Occurs frequently, seriously affecting the normal production of the oil field

However, the method of applying this protection principle to protect the inner wall of metal pipes has not been reported so far.

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