What is the service condition and material structure of 3PE

1. External wall anti-corrosion coating: data type and application conditions of pipeline outer wall coating.

 

② Inner wall anti-corrosion coating: the film applied on the inner wall of 3PE steel pipe to avoid internal corrosion, reduce friction resistance and improve throughput. The commonly used coatings are amine cured epoxy resin and polyamide epoxy resin, the coating thickness is 0.038 ~ 0.2mm. In order to ensure that the coating and the pipe wall are firmly bonded, the inner wall of the pipe must be treated externally. Since the 1970s, it has tended to use the same data for the coating on the inner and outer wall of the pipe, so that the coating on the inner and outer wall of the pipe can still be carried out.

 

③ 3PE anti-corrosion and thermal insulation coating for anticorrosive steel pipe: in order to reduce the heat dissipation from the pipeline to the soil, a composite coating of thermal insulation and anti-corrosion is added on the outside of the pipeline to reduce the heat dissipation from the pipeline to the soil. The commonly used thermal insulation material is rigid polyurethane foam, and the temperature is between 18 and 95 degrees. In order to improve the strength of the data, a layer of high-density polyethylene (HDPE) was applied outside the insulation layer to form a composite data layout to avoid groundwater entering into the insulation layer.

 

What is the service condition and material structure of 3PE anticorrosive steel pipe coating

 

2. If the outer protective pipe is polyethylene pipe, it is unnecessary to do anti-corrosion

 

Polyethylene is odorless, nontoxic, waxy, with excellent low temperature resistance (the lowest operating temperature can be up to - 70 ~ - 100 ℃), good chemical stability, ability to most acid-base corrosion (not resistant to oxidizing acid), insoluble in ordinary solvents at room temperature, water absorption is small, but because of its linear molecules, it can slowly dissolve in some organic solvents, without swelling, electrical insulation function Excellent.

 

3PE steel pipe coating is one of the most basic methods for 3PE steel pipe anti-corrosion, which is evenly and finely coated on the surface of the metal pipe after rust removal, so as to block it from various corrosive media. More and more composite materials or composite layout are used for anticorrosive coating of steel pipe. These data and layout should have outstanding dielectric, physical, chemical and wide temperature habits