3PE anti-corrosion steel pipe is a commonly used external anti-corrosion steel pipe with excellent anti-corrosion performance and a wide range of applications. The following is a detailed introduction:
Structural composition
3PE anti-corrosion steel pipe consists of a three-layer structure. The first layer is epoxy powder (FBE>100um), which is in direct contact with the surface of the steel pipe, providing initial anti-corrosion protection for the steel pipe and enhancing the adhesion between the coating and the steel pipe; the second layer is adhesive (AD) with a thickness of 170-250um. Its function is to enhance the adhesion between the epoxy powder coating and the outer high-density polyethylene anti-corrosion coating, so that the two are closely combined; the third layer is a high-density polyethylene (PE) anti-corrosion coating with a thickness of 1.8-3.7mm, which has excellent corrosion resistance, wear resistance and impact resistance.
Performance characteristics
· Excellent anti-corrosion performance：3PE coating has good resistance to chemical corrosion such as acid, alkali, salt, etc., can effectively prevent steel pipes from being corroded by the outside world, and can resist corrosion under various harsh environmental conditions 2.
· High mechanical strength：The steel pipe itself has high strength, coupled with the anti-corrosion coating on the outer layer, so that the 3PE anti-corrosion steel pipe has good mechanical properties when subjected to external forces such as pressure and tension, and is not easy to deform or damage 5.
· Good wear resistance: The outer polyethylene protective layer has a certain hardness and wear resistance, which can reduce the wear of the steel pipe during transportation, installation and use, and extend the service life of the steel pipe 2.
· Excellent impact resistance: The yellow adhesive in the middle layer has high toughness and can effectively absorb external impact force, thus improving the impact resistance of the steel pipe and enabling it to maintain structural integrity under complex geological conditions or external forces 2.
· Good high temperature resistance：The epoxy powder coating of the bottom layer can withstand higher temperatures and is suitable for use in high temperature environments. For example, in some hot oil pipelines or high-temperature steam pipelines, 3PE anti-corrosion steel pipes can also play a good anti-corrosion role 2.
· Convenient construction：It is prefabricated in the factory with uniform specifications and controllable quality. The construction process is simple and fast, which can effectively shorten the construction period and improve project efficiency 25.
· Environmental protection and energy saving：3PE coating is non-toxic and harmless, does not pollute the environment, and meets the requirements of sustainable development. In addition, its use can reduce maintenance costs and energy consumption, and has high economic benefits 2.
3. Application areas
· Oil and gas transportation：It can withstand high pressure and corrosive media for a long time, effectively protect oil and gas pipelines from corrosion, ensure transportation safety, and is widely used in the construction of oil and gas pipelines on land and undersea 234.
· Chemical Industry：Corrosive liquids are often used in chemical processes. 3PE anti-corrosion steel pipes can resist the erosion of these liquids, protect the integrity of the transportation pipeline, and are used to transport various corrosive media such as acids, alkalis, salts, etc. 234.
· Water supply system：It can prevent water supply pipes from being polluted and corroded, ensure the hygiene and safety of water supply, and is suitable for urban tap water supply pipes, industrial water delivery pipes, etc. 24.
· Heating system：Can withstand high temperature and corrosion, widely used to transport hot water and steam to ensure the stable operation of heating system 3.
· Water Conservancy Project：It plays an important role in the drainage system, water supply system and irrigation system in water conservancy projects, extending the service life of pipelines and reducing maintenance costs 3.
· Municipal Engineering：It can be used in construction projects such as urban drainage pipelines, gas pipelines, and can also be used as cable protection sleeves for electricity, communications, highways, etc.
· Other fields：It can also be used in building structures, shipbuilding, underground water supply and drainage in coal mines, underground grouting, positive and negative pressure ventilation, gas extraction and other fields.
Implementation Standards
The domestic implementation of SY/T0413-2002 standard. 3PE anti-corrosion steel pipe has a wide range of applications. The following is a detailed introduction:
1.
Oil and Gas Industry
1. Long distance pipeline。
2. Subsea pipeline.
Chemical Industry
1. Corrosive media pipeline。
2. Chemical storage facility connecting pipelines。
Water and wastewater industry
1. City water supply pipeline。
2. Sewage treatment pipes.
Heat industry
1. Hot water pipeline。
2. Steam transport pipelines.
Water conservancy engineering field
1. Irrigation system pipes。
2. Drainage system pipes.
Municipal engineering field
1. City gas transmission pipeline。
2. Urban drainage pipes.
Other fields
1. Building structural support。
2. Shipbuilding。
Raw material preparation
1. Seamless steel pipe selection。
2. Raw material inspection。
Production process of 3PE anti-corrosion seamless steel pipe
Steel pipe surface pretreatment
1. Degreasing。
2. Rust removal。
Heat treatment
1. Medium frequency induction heating。
Epoxy powder coating (FBE)
1. Electrostatic spraying principle。
2. Coating thickness control。
Adhesive (AD) and polyethylene (PE) coating
1. Co-extrusion process。
2. Thickness control and forming。
Cooling and solidification
1. Water cooling method。
Quality inspection and finished product processing
1. Appearance inspection。
2. Thickness detection。
3. Finished product labeling and packaging。
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