Advantages and installation points of plastic-coated steel pipes

Plastic-coated steel pipes, also known as plastic-coated pipes, steel-plastic composite pipes, and plastic-coated composite steel pipes, are based on steel pipes. A layer of plastic anti-corrosion layer or plastic anti-corrosion layer is fused to the inner surface of the steel pipe (bottom pipe) through spraying, rolling, dipping, and suction processes. A steel-plastic composite steel pipe with a plastic anti-corrosion layer fused to the inner and outer surfaces.

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Plastic-coated steel pipes use ordinary carbon steel pipes as the base pipe, and the inner and outer walls of the pipe are coated with thermoplastics with excellent chemical stability. It is a special chemical composite pipe that has been treated with anti-corrosion technology. It can effectively prevent the acid and alkali salts contained in the chemical fluid medium from corroding the pipe. In the past, chemical pipes could not withstand corrosion, so the pipes had to be replaced every year. Later maintenance costs are very high. This product improves its shortcomings and increases the service life to 20 years. Generally, there are more chemical pipelines buried underground. The previous pipelines cannot withstand such harsh usage environments as buried underground, so the chemical industry of previous generations has accelerated The aging of pipelines may even lead to leakage. Plastic-coated steel pipes for the chemical industry have changed this situation. Therefore, they are also known by more and more chemical plants and have become a popular pipeline material in the chemical industry.

Advantages of plastic-coated steel pipes:
1. Hygienic, non-toxic, no scale accumulation, no breeding of microorganisms, ensuring fluid quality
2. Resistant to chemical corrosion, soil and marine biological corrosion, and cathodic stripping resistance
3． The installation process is mature, convenient, and fast, and the connection is the same as that of ordinary galvanized pipes.
4． Good weather resistance, suitable for harsh environments such as deserts and saline-alkali
5. Smooth pipe wall, improved conveying efficiency, and long service life

Key points for construction and installation of plastic-coated steel pipes
1. It should be implemented by the “Technical Regulations for Plastic Coated Composite Pipe Engineering for Building Water Supply” CECS125:.
2. The following construction machines should be used for plastic-coated steel pipes:
(1) Cutting should be done with a metal saw;
(2) A special rolling groove machine should be used for grooving;
(3) The bent pipe should be cold-bent using a pipe bending machine;
(4) An electric threading machine should be used to process pipe threads;
(5) Files should be used for deburring and rounding corners of plastic-coated steel pipe ports;
(6) A small brush or toothbrush should be used to apply high-strength inorganic solvent liquid epoxy resin coating.
3. The construction procedures of plastic-coated steel pipes should meet the following requirements:
(1) Plastic-coated steel pipes should not be buried in reinforced concrete structural layers;
(2) Welding is prohibited during the installation of plastic-coated steel pipes;
(3) The installation of plastic-coated steel pipes should be gradually connected from large diameter to small diameter, and the pipe openings should be blocked in time;
(4) Throwing and violent impact of plastic-coated steel pipes are strictly prohibited during transportation, loading and unloading, and construction on construction sites;
(5) When installing plastic-coated steel pipes, if the pipe diameter is not larger than DN50, a pipe bending machine can be used for cold bending, but the bending radius of curvature shall not be less than 8 times the pipe diameter, and the bending angle shall not be greater than 10°.

The buried pipeline adopts the transmission line iron tower of plastic-coated steel pipe, which is composed of towers connected by tower pole devices. The tower is made of section steel. The steel surface of the tower rod and the inner and outer surfaces of the tower rod are hot-dipped with a modified polyethylene plastic layer. Plastic-coated steel pipes are steel pipes coated with red modified epoxy resin powder inside and outside. It is a new type of steel pipe made on the basis of steel pipes through sandblasting chemical pretreatment, preheating, internal and external coating, curing, and post-treatment.

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Successfully solved the problems of burial, corrosion and scaling of plastic-coated steel pipes. There will be no pipe blockage and spray blockage, which improves the service life of the fire water supply pipe. Plastic-coated steel pipes mainly focus on the excellent mechanical properties of steel and the excellent chemical corrosion resistance of polymer materials. The product has excellent antistatic, high voltage and flame retardant properties, and can withstand harsh operating environments. Its ultra-corrosion resistance greatly improves the service life of the pipeline.

This kind of steel pipe has good pressure resistance and heat preservation performance. It mainly protects the wires, so there will be no leakage at all. So far, manufacturers of plastic-coated steel pipes are changing these advantages. The tube wall is relatively smooth without burrs. Suitable for spanning cables or wires during construction.

Plastic-coated steel pipes for fire-fighting buried pipelines have the advantages of smooth wall thickness, good drainage performance, low fluid resistance, and no scaling. Compared with other pipelines, they can greatly reduce losses. At the same time, the linear expansion coefficient of the large-diameter plastic-coated pipe is very small, which makes it very beneficial as a main pipe, and greatly overcomes the defects of other plastic pipes and ordinary pipes with a large linear expansion coefficient.

Plastic-coated steel pipe is an upgraded product of traditional steel-plastic pipe and galvanized pipe. It has comprehensive properties such as high strength, high elongation, good low temperature brittleness, low expansion coefficient, corrosion resistance, wear resistance, and low fluid resistance. It is a new type of water supply and drainage, anti-corrosion green large-diameter pipeline, and it is more and more widely used in domestic industries.

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