Material analysis of 3PE anti-corrosion steel pipe
Date of Publication:2022-10-09

The base material of 3PE anti-corrosion steel pipe includes seamless steel pipe, spiral steel pipe and straight seam steel pipe. Three-layer polyethylene (3PE) anticorrosive coating has been widely used in the oil pipeline industry for its good corrosion resistance, water and gas permeability resistance and mechanical properties.

Introduction to the anticorrosive layer of 3PE anticorrosive steel pipe

3PE anti-corrosion steel pipe anticorrosive layer for buried pipeline life is crucial, the same material of the pipeline, some buried in the ground for decades without corrosion, some years of leakage. It's because they use a different coating.

3PE anticorrosion is generally composed of 3 layers:

A layer of epoxy powder (FBE> 100 um)

Two-layer adhesive (AD) 170 ~ 250UM

Three layers of polyethylene (PE) 2.5 ~ 3.7mm

In practice, the three materials will be mixed and integrated, and the steel pipe will be firmly combined to form an excellent anti-corrosion layer after processing. Its processing mode is generally divided into twining type and round die coating type two.

3PE anti-corrosion steel pipe advantages

The coating of 3PE anticorrosive steel pipe is epoxy powder anticorrosive coating which contacts the bottom layer with the steel pipe surface, and the middle layer is a copolymerizing adhesive with branch structure functional groups. The surface layer is high density polyethylene anti-corrosion coating. 3PE anti-corrosion steel pipe coating is also (three layers of polyethylene anti-corrosion coating), is the 2PE anti-corrosion layer in Europe and North America widely used epoxy powder anti-corrosion steel pipe coating (FBE) cleverly combined and produced a new anti-corrosion steel pipe coating. It has been recognized and used worldwide for more than a decade.

3PE anti-corrosion steel pipe inspection process

Firstly, the anti-corrosion steel pipe is tested, and the steel pipe is tested under various conditions to make it meet the conditions of making insulation steel pipe. Check whether the steel pipe is corroded, check and remove the embroidery on the steel pipe. The next step is to cover the steel pipe after rust removal and corrosion protection in the polyethylene sleeve, pipe forming. After the head repair, polyurethane foam is injected into it to fully fill the gap, so that it is fully filled. Inspect the anticorrosive steel pipe and the finished product of the insulation steel pipe.

3 PE anticorrosive pipe parent metal before do anticorrosive processing need to enter into GuanPing steel pipe inspection, record, on external surface of the steel pipe shot blasting derusting, then on the depth of the cleanliness of the surface outside steel pipe and anchor lines check whether meet the requirements, does not conform to the requirements of qualified with the hand wheel grinding, and the pipe end winding adhesive paper, dust processing, medium frequency heating to the required temperature, Epoxy powder spraying, adhesive extruder side winding, PE extruder side winding, water cooling of anti-corrosion pipes, spray labeling of qualified products, pipeline platform, stacking ready for shipping.

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