3PE anti-corrosion steel pipes for natural gas pipelines are more affordable

Description :

　　3PE anti-corrosion steel pipe is a type of pipeline (steel pipe) used in different working environments. In order to slow down or prevent the pipeline from being eroded and deteriorated by the chemical or electrochemical action of the external medium or the metabolic activity of microorganisms, 2 or 3 layers of polyethylene (3PE) are coated on its outer wall to achieve pipeline anti-corrosion. The service life of 3PE anti-corrosion pipe is extended by 3-5 times. The main function of fusion bonded epoxy powder coating is to form a continuous coating film, which is directly bonded to the surface of the steel pipe and has good chemical corrosion resistance and cathodic peel resistance; Reacts with the active groups of the intermediate layer adhesive to form a chemical bond, ensuring that the overall anti-corrosion layer has good adhesion at higher temperatures. The intermediate layer is usually a copolymer adhesive, which is mainly composed of polyolefin. Currently, ethylene based copolymer adhesives are widely used. The functional groups of the copolymer adhesive can react with the epoxy groups of the fusion bonded epoxy powder coating to form hydrogen bonds or chemical bonds, forming a good bond between the intermediate layer and the bottom layer; The non sexual ethylene part has a good affinity with the surface layer polyethylene, so the intermediate layer also has good bonding performance with the surface layer. The main function of polyethylene surface layer is to provide mechanical protection and anti-corrosion, which is the same as the traditional two-layer structure polyethylene anti-corrosion layer.

　　3PE anti-corrosion steel pipes for oil pipelines are impeccable! Oil is an important resource, and transportation safety is crucial to people's livelihoods. In the process of oil transportation, there are many corrosive media that can easily cause major accidents due to the corrosion of metals. The media that cause corrosion during the operation of oil pipelines are mainly chlorides and sulfides. Chloride can uniformly corrode carbon steel. There are over 200 types of sulfides in crude oil that corrode metals, including hydrogen sulfide, thiol, and sulfide. The high content of H2S in crude oil can cause cracks or even through cracks in pipelines. Furthermore, the laying of pipelines is carried out in harsh geographical environments in the wilderness, where there are many corrosive media to metals in the soil. Therefore, it is crucial to choose suitable transportation pipelines. The anti-corrosion steel pipe (three-layer polyethylene) process is an advanced anti-corrosion technology introduced from abroad in the late 1990s. Its full name is fusion bonded epoxy/extruded polyethylene structural protective layer. 3PE anti-corrosion technology combines the excellent performance of epoxy coating and extruded polyethylene anti-corrosion layer, and combines the interface characteristics and chemical resistance of epoxy coating with the mechanical protection characteristics of extruded polyethylene anti-corrosion layer, thereby significantly improving their respective performance. Its characteristics include high mechanical strength, wear resistance, corrosion resistance, heat resistance, cold resistance, and can be applied to media at 150 degrees Celsius, making it suitable for use in cold regions. Therefore, 3PE anti-corrosion coating is an ideal external protective layer for buried pipelines. According to departmental testing, buried pipelines using 3PE anti-corrosion technology can have a lifespan of up to 50 years.

　　The general thickness of 3PE anti-corrosion steel pipes is 1.8-3.7mm, or the thickness may be increased according to the special requirements of the project. Pipelines (steel pipes) are used in different working environments. In order to slow down or prevent the corrosion and deterioration of pipelines under the chemical and electrochemical action of external media or the metabolic activity of microorganisms, 2 or 3 layers of polyethylene (3PE) are coated on their outer walls to achieve pipeline anti-corrosion. The service life of 3PE anti-corrosion pipes is extended by 3-5 times. (1) Through a review of the 30-year application history of polyethylene anti-corrosion coatings in Europe, although theoretically corrosion or stress corrosion cracking may occur under peeling anti-corrosion coatings, there have been no cases of under film corrosion or stress cracking under peeling anti-corrosion coatings so far. At the Mannesmann Institute in Germany, long-term corrosion laboratory experiments were conducted to simulate the application effect of anti-corrosion coatings. Strengthen the price of 3PE anti-corrosion steel pipes. Its function as an adhesive is to connect the bottom layer and the outer protective layer with a thickness of 200-400 μ m. The protective layer polyethylene is a non functional polymer, and it is difficult to directly bond it to the surface of the steel pipe or the epoxy layer. Therefore, the intermediate layer adhesive must have both functional and non functional genes in order to achieve chemical bonding between polyethylene and epoxy. Adhesive is a type of ethylene copolymer, block copolymer, or trimer with a sex gene (the copolymer contains three monomers). Through copolymerization or block reaction, the end epoxy and the partially cured epoxy primer undergo chemical reaction, resulting in good adhesion. At the same time, the non sexual chain of the adhesive has a chemical affinity with polyethylene, causing it to melt and bond above the softening point temperature, blending with polyethylene and exhibiting strong adhesion. So, the adhesive in the three-layer PE has the advantages of strong adhesion, high water absorption, and resistance to cathodic peeling. Moreover, it can be extruded together with the protective layer polyethylene during the construction process, which is convenient for construction. Three layer (protective layer): Polyolefin, such as low-density polyethylene, high/medium density polyethylene, or modified polyethylene (PP).

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