TPEP Corrosion-Resistant Pipeline Details:
TPEP Corrosion-Resistant Pipe: Known in Chinese as "externally wrapped polyethylene, internally fused epoxy corrosion-resistant steel pipe," it represents the fourth-generation anti-corrosion technology for long-distance water conveyance pipelines. As indicated by its full Chinese name: the exterior of the pipe utilizes a 3-layer PE structure with anti-corrosion technology wrapped with polyethylene, while the interior is treated with hot-fused epoxy for anti-corrosion. The standard meets food-grade requirements. It is truly a corrosion-resistant pipeline for conveying. Both the internal and external anti-corrosion treatment technologies of the pipe reach the most advanced level currently available, with a service life of up to 50 years.
Interior Corrosion Protection Technology: Hot Melt Epoxy Powder Coating
Internal epoxy coating, epoxy resin powder is a polar molecule, a thermosetting powder coating, directly related to the heating temperature. The reaction temperature of epoxy powder is divided into gelation temperature and curing temperature, with gelation temperature lower than curing temperature. During the gelation process, the coating only undergoes melting and leveling without producing a curing reaction. It must be continuously heated again within the specified time to achieve full curing. Once the epoxy powder reaches the curing temperature, it can react and bond with the steel pipe matrix, exhibiting strong adhesion. Additionally, epoxy resin is a high polymer material with excellent corrosion resistance and dense coating with good impermeability. According to different coating processes, it is classified into general type epoxy powder and pipeline-specific epoxy powder.
Detailed外壁Anti-Corrosion Technology: Spiral 3PE Coating
3PE Corrosion Protection Technology: The full name of 3PE Corrosion-Resistant Steel Pipe in Chinese is Three-Layer Polyethylene Corrosion-Resistant Steel Pipe. It involves applying a 3PE (Three-Layer Polyethylene) corrosion protection medium to the outer wall of the main steel pipe after it has been thoroughly rust-removed in accordance with engineering requirements. The corrosion protection structure consists of three layers: one layer of heat-fused epoxy powder, and the second and third layers are adhesive and polyethylene bonded spiral layers.
The 3PE corrosion-resistant coating is generally composed of three layers:
One layer of epoxy powder (FBE > 100um)
Double-coated Adhesive (AD) 170-250um
Three-layer Polyethylene (PE) 2.5-3.7mm
In practical operation, the three materials are blended together to become one, then processed to form a durable anticorrosive coating that firmly bonds with steel pipes. The processing methods generally include winding and round mold wrapping, with winding being the more commonly used method.
3PE anti-corrosion steel pipes, with a three-layer polyethylene protective coating (3PE), combine the superior properties of both fused epoxy powder coatings and extruded polyethylene anti-corrosion layers. This integration merges the interface characteristics and chemical resistance of the fused epoxy powder coating with the mechanical protection features of the extruded polyethylene layer, significantly enhancing the performance of each. Consequently, it is highly advantageous as an external protective layer for buried pipelines. According to relevant information, a three-layer PE coating can extend the lifespan of buried pipelines to 50 years. Currently, it is recognized as an advanced external anti-corrosion technology for pipelines worldwide. In our country, three-layer PE has been率先 applied in the petroleum and natural gas systems. The Shaanxi to Beijing natural gas pipeline and the Kusun oil pipeline, a national key project with nearly 4,000 kilometers of pipeline, have all adopted three-layer PE external anti-corrosion coatings. In Tianjin, the 67-kilometer high-pressure pipeline for Shaanxi gas entering Tianjin, the 30-kilometer high-pressure natural gas pipeline along the outer ring road, and the 122-kilometer pipeline of the underground gas storage facility of the Shaanxi to Beijing line also utilize three-layer PE. It has become the development direction for future external anti-corrosion coatings of pipelines!?
