3PE anti-corrosion steel pipe manufacturer

Description :

　　The advantages of 3PE anti-corrosion steel pipes are analyzed and introduced. Ordinary steel pipes will experience severe corrosion in harsh environments, which will reduce the service life of the steel pipes. The service life of anti-corrosion and insulation steel pipes is also relatively long, usually around 30-50 years. Proper installation and use can also reduce the maintenance cost of the pipeline network. Anti corrosion and insulation steel pipes can also be equipped with alarm systems to automatically detect pipeline leakage faults, accurately identify the fault location, and automatically sound an alarm. 3PE anti-corrosion steel pipes have good insulation performance, with heat loss only 25% of traditional pipes. Long term operation can still save significant resources, significantly reduce energy costs, and have strong waterproof and corrosion-resistant capabilities. They do not require pipe trenches and can be directly purchased into underground or water. Construction is also simple and fast, and the overall cost is relatively low. They also have good corrosion and impact resistance under low temperature conditions, and can be directly buried in frozen soil in certain environments.

　　3PE anti-corrosion steel pipes are essential in current construction, and we believe that with the extension of technology, they will achieve even more brilliant results in the future In the early stage of introducing 3PE coating technology, China Petroleum Engineering Technology Research Institute formulated a Chinese 3PE coating construction acceptance specification in April 1995, referring to DIN30670 and NFA49 (March 1988 edition), for the construction of Shaanxi Beijing pipeline and Kushan pipeline. In the same year, it was upgraded to the industry standard SY/T4013. After several years of engineering construction summary and practice, it was revised to SY/T0413- in 2001 and implemented from August 1, 2002.

　　Among them, the outer 3pe and inner fusion bonded epoxy composite steel pipe used in the Henan section of the South to North Water Diversion Middle Route has been successfully applied to the supporting facilities of the South to North Water Diversion Project. Solved the characteristics of less scaling, smoothness, wear and corrosion resistance on the inner wall. 3PE anti-corrosion pipeline is a type of pipeline 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 steel pipes is extended by 3-5 times.

　　3PE anti-corrosion steel pipe is an advanced anti-corrosion technology introduced from abroad in recent years. Its full name is fusion bonded epoxy/extruded polyethylene structural protective layer, which consists of the following three layers: the bottom layer is fusion bonded epoxy; The middle layer is adhesive; The surface layer is extruded polyethylene. The total thickness of the protective layer is greater than 2.2-2.9mm. In the three-layer structure, the main function of epoxy primer is to form a continuous coating, 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 epoxy primer 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 the 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. The three-layer structure polyethylene anti-corrosion layer combines the excellent properties of epoxy coating and extruded polyethylene anti-corrosion layer, combining the interface characteristics and chemical resistance of epoxy coating with the mechanical protection characteristics of extruded polyethylene anti-corrosion layer, thus achieving their respective performance. Therefore, as an external protective layer for buried pipelines, it is very superior. According to relevant information, three-layer PE can extend the service life of buried pipelines to 50 years, and is currently considered as an external anti-corrosion technology for pipelines internationally.

　　The three-layer structure protective layer of 3PE anti-corrosion steel pipes for water supply pipelines, also known as three-layer PE (3PE), is a * * anti-corrosion technology introduced from abroad in recent years. Its full name is fusion bonded epoxy/extruded polyethylene structural protective layer, which consists of the following three layers: the bottom layer is fusion bonded epoxy (≥ 80 μ m); The middle layer is adhesive (170 to 250 μ m); The surface layer is extruded polyethylene (about 2mm). The total thickness of the protective layer is about 1.8 to 3.7mm. In the three-layer structure, the main function of the 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 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.

　　3PE anti-corrosion generally consists of three layers of structure: * * * layer of epoxy powder (FBE>100um), second layer of adhesive (AD) 170-250um, and third layer of polyethylene (PE) 2.5-3.7mm. In actual operation, the three materials are mixed and integrated, and processed to firmly bond with the steel pipe to form an excellent anti-corrosion layer. Its processing methods are generally divided into two types: winding and circular mold wrapping. The 3PE anti-corrosion steel pipe coating, also known as the three-layer polyethylene anti-corrosion coating, is a new type of anti-corrosion steel pipe coating that cleverly combines the European 2PE anti-corrosion coating with the widely used epoxy powder anti-corrosion steel pipe coating (FBE) in North America.

　　The coating of 3PE anti-corrosion steel pipe is an epoxy powder anti-corrosion coating in contact with the bottom layer and the steel pipe surface, and a copolymer adhesive with branched functional groups in the middle layer. The surface layer is a high-density polyethylene anti-corrosion coating. The 3PE anti-corrosion coating combines the high impermeability and mechanical properties of epoxy resin and polyethylene materials. So far, it is globally recognized as an effective and high-performance pipeline anti-corrosion coating, which has been applied in many engineering projects. The reason for low water absorption is that the closed cell ratio of 3PE foam is up to 92%. Low thermal conductivity and low water absorption, combined with high-density polyethylene or fiberglass shell with good anti-corrosion layer and surface waterproofing function, have greatly improved the overall heat dissipation of the heating pipeline by rotating the environment of the rigid trench laying heating pipeline "wet cotton jacket". The heat loss of the heating network is 2%, which is less than the overseas standard of 10%. Three layer PE can extend the service life of buried pipelines to 50 years, and is currently considered the best external anti-corrosion technology for pipelines internationally. In China, three-layer PE has been first applied in the oil and gas system. The Shaanxi Beijing natural gas pipeline and the Kushan oil pipeline that have been built in China, as well as the nearly 4000 kilometers of the West East gas transmission project, have all adopted a three-layer PE external anti-corrosion coating. In Tianjin, the 67 kilometer high-pressure pipeline from Shaanxi to Tianjin, the 30 kilometer high-pressure natural gas pipeline from Lijun on the outer ring road, and the 122 kilometer underground gas storage pipeline on the Shaanxi Beijing line also use three-layer PE. It has become the development direction for the external anti-corrosion coating of pipelines in the future. After the production of 3PE anti-corrosion steel pipes is completed, they need to be shipped to the construction site, but there are still a series of preparations before shipment. The main preparation work is to inspect the product and issue relevant quality certificates after passing the inspection. And there is also a list to be prepared that matches the quantity of the contracted products, which should indicate the length and quantity of each 3PE anti-corrosion steel pipe. If there are any related accessories for the products, they should also be indicated and the quantity should be checked to ensure compliance with the list. Contacting the truck is also one of the important links, by communicating with the driver of the dedicated line to ensure the delivery and delivery to the construction site within a few days. It's about loading. As the 3PE anti-corrosion steel pipe only has an anti-corrosion layer that cannot be bumped, strict attention should be paid to using hooks to hang both ends of the steel pipe for loading. This way, the anti-corrosion layer will not be damaged and the steel pipes will be neatly stacked. Once completed, the 3PE anti-corrosion steel pipes can be transported away.

　　The applicability of water supply pipelines for anti spray and sprinkler systems. Cable protection sleeves for power, communication, highways, etc. Suitable for high-rise building water supply, heating network, water supply engineering, gas transmission, buried water transmission and other pipelines. Process pipelines for transporting corrosive media in industries such as petroleum transportation pipelines and printing and dyeing. Anti corrosion engineering for sewage treatment discharge pipes, sewage pipes, and biological tanks. For agricultural irrigation pipes, deep well pipes, drainage pipes and other network applications, it can be said that 3pe anti-corrosion steel pipes are essential in current construction, and we believe that with the extension of technology, they will have even more brilliant achievements in the future.

　　Analyst's viewpoint: From a regional perspective, the recovery of production is mainly concentrated in East China, Central China, and Northwest China, mainly due to the release of some production that has been restricted due to production pressure. The increase in steel raw materials has led to a decrease in supply side pressure and weakened price support, which is bearish on steel prices in the short to medium term. Steel inventory statistics released: National building materials: social inventory of 4.9756 million tons, a decrease of 151900 tons from last week, a decrease of 2.96%; The factory warehouse has a capacity of 2.4554 million tons, an increase of 44800 tons or 1.86% compared to last week; The output was 3.8477 million tons, a decrease of 0.35 million tons from last week. In addition, the black market has been in a state of long short game recently, often showing a fluctuating adjustment situation, which has limited impact on the market. Therefore, overall, it is expected that the market price of steel billets will experience weak pressure in the near future. This week, the scrap steel market has been generally strong, and many steel mills in various regions have raised their purchase prices for scrap steel. Recently, with the support of replenishment and winter storage, steel mills have raised the purchase price of scrap steel to attract more sources of goods. Among them, Shagang, a mainstream steel plant in East China, raised its price by 150 yuan/ton, with a cumulative increase of 350 yuan/ton within the month, leading many surrounding steel plants to follow suit. The increase this time is mostly between 50-150 yuan/ton.

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