For Water Gas And Oil Submerged Arc Welded Steel Pipe Large Diameter

In the process of oil and gas transmission pipeline anticorrosion construction, straight seam steel pipe surface treatment is one of the key factors determine the service life of the pipeline corrosion, it is a solid combination of anti-corrosion layer and straight seam steel pipe can be provided. Research study of the specialized institutions, the life of the coating depends on the quality of coating types, coating and construction environment factors, such as straight seam steel pipe surface treatment effects on coating life accounted for about 50%, therefore, should be in strict accordance with the specification on the coating on the surface of straight seam steel pipe requirements, continuously improve the straight seam steel pipe surface treatment.

3PE anticorrosive pipe is used in different working environment. In order to slow down or prevent the corrosion and deterioration of the pipe under the chemical and electrochemical action of the external medium or the metabolic activity of microorganisms, two or three layers of polyethylene (3PE) are coated on the outer wall of the pipe to achieve the anticorrosion of the pipe. The service life of 3PE anticorrosive pipe is extended by 3-5 times.

Polyethylene three-layer structure protective coating, also known as three-layer PE (3pe), is an advanced anti-corrosion technology introduced from abroad in recent years.

Its full name is fused epoxy/extruded polyethylene structural protective layer, which consists of three layers: the bottom layer is fused epoxy (> 80 micron); the middle layer is adhesive (170-250 micron); and the surface layer is extruded polyethylene (about 2 mm). The total thickness of the protective layer is about 1.8-3.7 mm. In the three-layer structure, the main function of fused epoxy powder coating is to form a continuous coating and bond directly with the surface of steel pipe, which has good chemical corrosion resistance and cathodic peeling resistance, and react with the active group of the intermediate layer adhesive to form chemical bonding, so as to ensure that the overall anti-corrosion coating has good performance at high temperature. Cohesiveness. Intermediate layer is usually copolymer binder, the main component of which is polyolefin. At present, vinyl copolymer binder is widely used. The polar functional groups of copolymer adhesives can react with the epoxy groups of fused epoxy powder coatings to form hydrogen bonds or chemical bonds, which can form a good bond between the middle layer and the bottom layer. The non-polar functional groups of ethylene have a good affinity with the surface layer polyethylene, so the middle layer and the surface layer also have good bonding properties. 

About the use of anti-corrosion steel pipe top place, underground coal used in coal mine drainage, shotcrete, positive negative pressure ventilation, drainage, gas, such as fire sprinkler pipe network. Power plant, thermal power plant process water slag, backwater walks. Walked oil, oil pipelines, chemical pharmaceutical, printing and dyeing industries walks the process piping of corrosive medium. Sewage disposal, sewage discharge pipe, sewage pipe and biological pond anti-corrosion engineering. Agriculture, agriculture irrigation pipe, deep well pipe and drainage pipe network. Fire, about the sprinkler, sprinkler system water supply pipe has outstanding usability. Highway, electric power, communication, highway cable casing maintenance, etc. Municipal engineering, used in high-rise building water supply, heat supply network heating, water engineering, gas walks, buried water pipe, etc.