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

A sacrificial anode protection and sacrificial anode technology is applied in the field of using sacrificial anodes to protect the inner wall of anti-corrosion pipeline joints, which can solve the problems of restricting the promotion of new anti-corrosion coatings, clogging of mud and sand, and inability to repair the joints.

Inactive Publication Date: 2005-03-09
PETROCHINA CO LTD +1
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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 r

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

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Embodiment Construction

[0018] In actual design and construction, the designer of the present invention realizes the technical characteristics of the present invention by following specific operations: 1. at first prepare the special alloy of sacrificial anode: its composition range is: zinc 2.0%~7.0%, preferably 4.0%; magnesium 1.0% to 5.0%, preferably 2.0%; other elements and additives 0.01% to 2%; aluminum balance. The aluminum-zinc-magnesium alloy is then fabricated into a ring-shaped sacrificial anode.

[0019] 2. First fix the aluminum-zinc-magnesium alloy sacrificial anode on the inner wall of the steel pipe to be treated by welding, bonding, mechanical inlay, interference fit, etc. at one end (or both ends) of the steel pipe, then carry out the inner wall anticorrosion, and finally use The current welding process is used for welding. This technology uses the potential difference between the aluminum-zinc-magnesium alloy and the base metal of the steel pipe and the weld seam to achieve the fu...

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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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Application Information

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IPC IPC(8): C23F13/14
Inventor 王勇赵卫民韩涛董立先韩彬
Owner PETROCHINA CO LTD
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