Medium-frequency heating cabinet
The base materials of 3PE anti-corrosion steel pipes include seamless steel pipes, spiral steel pipes and straight seam steel pipes.
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Details Introduction
The base materials of 3PE anti-corrosion steel pipes include seamless steel pipes, spiral steel pipes and straight seam steel pipes. The three-layer polyethylene (3PE) anti-corrosion coating has been widely used in the petroleum pipeline industry due to its excellent corrosion resistance, water vapor permeability resistance and mechanical properties. The anti-corrosion coating of 3PE anti-corrosion steel pipes is crucial to the lifespan of buried pipelines. Pipes of the same material may not corrode for decades when buried underground, while others may leak within just a few years. It is precisely because they adopt different external anti-corrosion coatings.
A brief description of the PE anti-corrosion process:
1) Shot blasting rust removal for steel pipes: Before rust removal, the appearance of the steel pipes is inspected. The steel pipes then enter the shot blasting room for shot blasting rust removal.
2) Medium-frequency heating: Use a medium-frequency heating device to heat the steel pipe. The heating temperature is suitable for epoxy powder thermal spraying, mainly in accordance with the technical instructions of the epoxy powder manufacturer.
3) Epoxy powder electrostatic spraying: The hot-melt epoxy coating has a strong adhesion to the steel pipe, so the hot-melt epoxy coating is used as the base layer of the polyethylene anti-corrosion layer. Epoxy powder thermal spraying is carried out by using the surface temperature of the steel pipe.
4) Adhesive winding: Due to the poor adhesion between the polyethylene layer and the fusion-bonded epoxy coating, adhesives are used to enhance the adhesion between the fusion-bonded epoxy coating and the polyethylene layer, which are two materials of different polarities.
5) Polyethylene winding: It is wound and rolled through a pressure guiding system. Adjust the pressure of the pressure guiding system to ensure the uniform thickness of the polyethylene layer.
6) Water cooling: After the steel pipe is coated with 3PE, it enters the cooling chamber for cooling and shaping.
7) Pipe end treatment: Separate the polyethylene coating layer according to the interface identification. The PE beveling system is used to bevel the pipe ends to facilitate welding construction and anti-corrosion joint repair during pipeline laying.
8) Finished products: Transport the completed beveled steel pipes to the finished product storage area, ensuring good ventilation, protection from rain and ultraviolet rays.
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