Carbon steel 3PE/3PP coated pipe

CS (Carbon steel) 3PE/3PP coated pipe refers to the use of carbon steel as the base material, and the external application of three layers of anti-corrosion coating system of the pipeline, this pipeline is widely used in oil, natural gas and other transportation media pipeline engineering. 3PE/3PP, also known as three-layer structure polyethylene/propylene protection, is an advanced external corrosion prevention technology, the use of these two coatings can effectively reduce the corrosion of carbon steel pipes, enhance the service life of carbon steel pipes.

Carbon steel 3PE coated pipe

3PE coated pipe is the abbreviation of "three-layer structure polyethylene coated steel pipe". It is a kind of pipe product that protects the surface of carbon steel pipe by three layers of anti-corrosion coating. The coated pipe mainly has three layers:

1. Epoxy primer layer (thickness >100um) : closely adhered to the surface of carbon steel substrate, providing excellent adhesion and initial anti-corrosion protection.
2. Middle bonding layer (thickness: 170um~250um) : Generally using polyester or polyethylene binder, play the role of connecting the primer and the top layer.
3. Polyethylene finish layer (thickness 1.8~3.7mm) : provides external weather resistance and UV resistance, while increasing mechanical damage resistance.
3PE coated pipe is currently the most advanced pipeline anticorrosion technology, it combines the advantages of 2PE and FBE pipe, while avoiding their disadvantages, so that the entire system has all the functions, so as to better protect the pipe.

Advantages of 3PE coated tubes

1. Excellent corrosion resistance
The 3PE coated pipe has three layers of protective barriers, and the bottom layer of epoxy resin coating is closely combined with the steel pipe substrate to provide excellent adhesion; The middle layer plays a bonding role; The top polyethylene finish has good chemical resistance, UV resistance and weather resistance, and can effectively prevent water, salt, acid and alkali from eroding the pipe wall.

2. Excellent damage resistance
Polyethylene finish has high wear resistance and impact resistance, and can effectively resist the damage of friction, collision and vibration to the pipeline during transportation, installation and operation.

3. Good adhesion
The epoxy primer is closely combined with the steel pipe substrate, and the intermediate layer ensures a good bond between the coatings, ensuring that the entire 3PE coating system is not easy to fall off or appear hollow under harsh conditions, maintaining the protective effect.

4. Easy installation
After the pre-coated pipe is installed in the field, no additional anti-corrosion treatment is required, saving construction and maintenance time, while its long service life and low maintenance costs make the overall economic benefits higher.

Carbon steel 3PP coated pipe

CS 3PP coated pipe and CS 3PE coated pipe are carbon steel as the base material, through a three-layer anti-corrosion coating system to protect the pipe products. The 3PP coating is similar to the common 3PE coating, but its outer coating is usually polypropylene (PP), which gives the product different chemical and physical properties. The following is its structural composition:

1. Epoxy primer layer: closely combined with carbon steel substrate to provide excellent adhesion as the basis of anti-corrosion system.
2. Intermediate bonding layer: Other binders are often used to ensure that there is a strong bond between the primer and the top paint, thereby enhancing the durability of the overall coating.
3. Polypropylene topcoat (PP) : Polypropylene as the top material, has excellent high temperature resistance, chemical corrosion resistance and UV resistance. Compared with commonly used polyethylene topcoat (PE), PP may show better protective effect under some special media or temperature conditions.

3PP coated tubes provide excellent corrosion resistance, temperature resistance and mechanical damage resistance to carbon steel tubes. This coating system not only extends the service life of the pipeline, but also reduces long-term maintenance costs, which is suitable for oil and gas, chemical, municipal and other fields.

Advantages of 3PP coated tubes

1. Corrosion resistance
The multi-layer coating of the 3PP coated pipe forms a complete protective barrier, which can effectively block the direct contact of water, acidic media, salt and other corrosive substances with the carbon steel substrate, thus greatly extending the service life of the pipe.

2. Temperature and chemical resistance
Polypropylene finish has high heat and chemical resistance, suitable for some high temperature or special chemical environment in the pipeline, to provide long-term stable protection.

3. Resistance to mechanical damage
Coating systems improve the resistance of pipes to mechanical shock, friction and vibration, reducing scratches and damage during transportation.

4. Economic benefits
Although the initial cost of 3PP coated pipe is slightly higher than that of carbon steel original pipe, due to its excellent anti-corrosion performance and low maintenance requirements, it can significantly reduce operation and maintenance costs and improve system reliability in the long run.

Summary

CS (Carbon steel) 3PE/3PP coated pipe By applying three layers of protective coating on the surface of carbon steel substrate, not only maintains the high strength and economy of carbon steel pipe, but also greatly improves its corrosion resistance and mechanical damage resistance. This coating system has significant advantages in the oil and gas, chemical and urban infrastructure sectors, and is an important material choice to ensure the long-term safe operation of pipeline systems.