Manufacturers sell 3PE anti-corrosion seamless steel pipes for natural gas pipelines at a high price

Description :

　　In the three-layer structure, the main function of the fusion bonded epoxy powder coating is to form a continuous coating film, directly bond with the surface of the steel pipe, and have good chemical corrosion resistance and cathodic stripping 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 polar 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-polar ethylene portion 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 pipe structure: DIY layer of epoxy powder (FBE>100um), second layer of adhesive (copolymer adhesive) 170-250um, third layer of polyethylene (PE) 2.5-3.7mm. These three materials are tightly fused together and firmly combined with the steel pipe to form an excellent anti-corrosion layer. 2pe anti-corrosion steel pipe pipeline: The pipeline has a two-layer PE anti-corrosion structure, with a layer of adhesive (AD) and a second layer of polyethylene (PE). The two materials are integrated into one, and the thickness of each layer is the same as that of the three layers of PE The main components of natural gas are alkanes, the vast majority of which contain varying amounts of low-carbon alkanes such as ethane, propane, butane, and pentane, as well as non hydrocarbon substances such as carbon dioxide, sulfur compounds, etc., depending on different geological formation conditions; Some gas fields also contain helium gas. Under standard conditions, jiawan to butane exists in a gaseous state, while pentane and above are liquids. Human beings have long recognized the value of natural gas utilization. According to historical records, in 61 BC, China had fire wells, also known as natural gas wells, in cities such as Lhasa. The Ming Dynasty's "Tiangong Kaiwu" also recorded in detail the use of bamboo pipes to transport gas as fuel. After the development of bamboo and wood pipes, cast iron pipes, etc., today's natural gas pipelines mainly use steel pipes, and the use of natural gas pipelines to transport natural gas has become the main way of transporting large amounts of natural gas on land. At present, the long-distance transportation of liquefied natural gas through pipelines at low temperatures is still in the experimental stage.

　　Generally speaking, natural gas pipeline systems consist of two parts: pipeline transmission stations and line systems, the latter including pipelines, valve chambers along the line, pipeline communication systems, scheduling and automatic monitoring systems, etc. Among them, natural gas transmission pipelines are assembled by connecting single pipes one by one, which is a continuous closed transportation system. From transportation, storage to user use, natural gas is always under pressure. Polyethylene three-layer structure, also known as three-layer PE/PP, is an advanced external anti-corrosion technology introduced from abroad in recent years. Its structure consists of three layers: the bottom layer is fusion bonded epoxy, the middle layer is adhesive, and the surface layer is extruded polyethylene. The three-layer PE anti-corrosion layer combines the interface characteristics and chemical resistance of epoxy coating with the mechanical protection characteristics of extruded polyethylene anti-corrosion layer, significantly improving their respective performance. According to relevant information, three-layer PE can extend the lifespan of buried pipelines to 50 years. This anti-corrosion coating is widely used in long-distance oil and gas pipelines.

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