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3LPE steel pipe coating machine
3LPE coating steel pipe’s material includes seamless steel pipe, spiral steel pipe and straight seam steel pipe.
3PE anti-corrosion steel pipe’s material includes seamless steel pipe, spiral steel pipe and straight seam steel pipe. 3PE anticorrosive coating has been widely used in petroleum pipeline industry for its good corrosion resistance, water permeability resistance and mechanical properties. 3PE anticorrosive steel pipe an anticorrosive layer for buried pipeline life is very important, the same material of the pipeline, some buried in the underground for decades not corrosion, some years leak, is because they use different external anticorrosive layer.
3PE anticorrosion is generally composed of 3 layers:
No. |
Materials |
Coating thickness |
First layer |
FBE |
>100um |
Second layer |
AD |
170-250um |
Third layer |
PE |
1.8-3.7mm |
In practice, the 3 materials will be mixed into one, after processing to make it firmly combined with steel pipe to form an excellent anti-corrosion layer.
The coating of 3PE anticorrosive steel pipe integrates the high impermeability and high mechanical properties of epoxy resin and polyethylene materials. So far, it is recognized globally as the best pipeline anticorrosive coating with the best performance and the best use effect, so as to be applied in many projects.
The internal pipe is divided into 2 kinds of anticorrosion: one is hot melt epoxy powder anticorrosion (High temperature fusion), other one is liquid epoxy coating, commonly used liquid epoxy IPN8710 (Cold spraying at room temperature). These 2 kinds of internal anticorrosion form process and performance are different, specifically shown in:
Requirement of pipeline using |
Internal coating thickness (um) |
|
Drag reduction pipeline (Liquid epoxy coating) |
≥50 |
|
Anticorrosive pipeline (High temperature fused epoxy powder coating) |
Common level |
≥250 |
Strengthen level |
≥350 |
Pipe feeding → Pre heating → External shot blasting → Rust removal quality inspection → Intermediate frequency heating → Epoxy powder spraying → AD extrusion and coating → PE extrusion and coating → Water cooling → Coating detection → Appearance detection → Pipe end grinding → Internal shot blasting or sand blasting → Rust removal and cleaning → Epoxy power or Liquid spraying
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