Anti-corrosion steel pipe refers to the commonly used three-layer structure polyolefin coating (MAPEC) external anti-corrosion steel pipe, other anti-corrosion methods are IPN8710, FBE epoxy powder, epoxy coal asphalt, etc., generally refers to the outer wall of steel pipe anti-corrosion, the parent material includes seamless steel pipe, spiral steel pipe and straight seam steel pipe. 3PE anti-corrosion coating with its good corrosion resistance, water water and gas permeability and mechanical properties in the oil pipeline industry has been It is widely used in oil pipeline industry. Next, the anti-corrosion process of 3PE steel pipe is introduced.
Steel pipe inner wall anti-corrosion is divided into two kinds: is hot melt epoxy resin powder anti-corrosion (high temperature melt), the other is liquid epoxy coating, commonly used liquid epoxy ipn8710 (room temperature cold spray).
Pressure steel pipe (pipeline) anti-corrosion coating construction method as the pressure pipeline corrosion prevention technology, the application of more, universal is the coating and composite materials. For the corrosive medium is particularly strong use of non-metallic corrosion-resistant materials. In the petroleum and petrochemical industries, individual parts of the pipeline also use corrosion inhibitor technology. For urban underground pipelines and underground long-distance pipelines using cathodic protection technology is also more common.
The use of coatings for pipeline corrosion prevention is a simple and easy to use method. The main basis for the selection of coatings is the merits of its performance.
There are three main requirements for the coating as follows.
(1) good corrosion resistance coating formed by the coating, in contact with various acids, alkalis, salts, industrial sewage, chemical atmosphere and other corrosive media, should be relatively stable, can not be dissolved by the corrosive medium, swelling or decomposition, and can not react chemically with the medium to generate new harmful substances.
(2) good impermeability coating in contact with the permeability of the liquid or gas medium, have a better stop its permeability to prevent its corrosive effect on the surface of the pipeline.
(3) better adhesion and flexibility: the coating cannot fall off because of the vibration or slight deformation of the pipeline, requiring the coating to have a certain mechanical strength.
3PE anti-corrosion steel pipe is widely used in industry, with wide functional coverage, suitable for pipeline networks such as underground coal mine water supply and drainage, underground slurry spraying, positive and negative pressure ventilation, gas extraction, fire sprinkling, etc., process water waste and return water transmission pipeline of thermal power plant; for water supply pipeline of anti-spray system; cable protection casing of electric power, communication, highway, etc.; for pipelines of high-rise building water supply, heat network, water plant, buried water transmission, etc. Pipelines for conveying corrosive substances such as petroleum pipelines, chemical and pharmaceutical, printing and dyeing, etc. It can be said that 3PE anti-corrosion steel pipe is an indispensable part of industrial construction in China, and there is a greater upside in the future.