Anti-corrosive steel pipe with internal epoxy coating and external polyethylene (PE) coating

Introduction:

Anti-corrosion steel pipes with internal epoxy coating and external polyethylene coating is a new type of steel-plastic composite pipe, which has excellent mechanical properties and anti-corrosion and anti-aging properties.Widely used in water conservancy, electric power, chemical industry, petroleum and many other industries.

Classification:

The anti-corrosive steel pipes with internal epoxy and external polyethylene coating is divided into: internal epoxy powder coating and external single layer PE coating steel pipe,internal  liquid epoxy coating and external single layer PE coating steel pipe, internal epoxy powder coating and external three layers PE coating steel pipe, internal liquid epoxy coating and external three -layer polyethylene coating steel pipe.

 

Inner epoxy coating external polyethylene coating structure composition:

  1. Steel pipesubstrate: seamless steel pipe, electric welded steel pipe(straight seam welded, spiral welded).
  2. Internal anti-corrosive coating: Sanitary grade fused epoxy powder coating, heavy anti-corrosive fused epoxy resin powder.
  3. External anti-corrosive coating: hot-melt single-layer polyethylene powder coating.

The internal epoxy coating external three-layer polyethylene (3PE) structure composition:

  1. Steel pipesubstrate: seamless steel pipe, electric welded steel pipe(straight seam welded, spiral welded).
  2. Internal anti-corrosive coating: Sanitary grade fused epoxy powder coating, heavy anti-corrosive fused epoxy resin powder.
  3. External anti-corrosion coating: hot-melt three-layer polyethylene coating, the bottom layer is fused epoxy resin powder, the middle layer is hot-melt adhesive, the outermost layer is high-density polyethylene.

Anti-corrosive steel pipe with internal epoxy coating and external polyethylene (PE) coating

Production process:

  1. Intermediate frequency heating steel pipe

Compared with the traditional electric furnace heating method, if heating has a higher conversion rate, which effectively saves the electric energy.Intermediate frequency heating is adopted, and the heat in the steel pipe is distributed from the inside to the outside, so that the heating temperature is more uniform, effectively ensuring the high quality curing of epoxy coating.

  1. Monolayer polyethylene adopts internal spray and external spray process

The technology of internal spraying epoxy powder and outer spraying polyethylene powder is called curtain method, also known as dappling process, which uses the waste heat of pipe to cure the two at the same time by means of intermediate frequency heating, and does not need to be separately coated and cured.

  1. The three-layer structure polyethylene usesthe fusion knot winding process

The internal wall is anti-corrosive coated by thermal spraying epoxy powder, and the powder is evenly coated on the internal surface of the steel pipe after high temperature heating and melting.The outer coating adopts high pressure extrusion winding technology, which greatly improves the compactness, toughness, abrasion resistance, impact resistance and bending resistance of the coating, and can effectively prevent the mechanical damage during construction and damage of plant roots and soil environmental stress in the process of use.

  1. Internal and external coatings of the steel pipes are done at the same time

Internal epoxy and external three layer PE realized synchronous coating, epoxy synchronous curing the core technology of one-time film, both inside and outside surface and spray coating not only greatly reduces the time, improve work efficiency, and coating process, the steel pipe under the internal and external coating packages at the same time, maximum reduces the heat loss, make full use of the latent heat of steel pipe, further improve the thermal efficiency.

 

Internal epoxy coating and external polyethylene coating pipeline characteristics:

1) The anti-fouling and anti-moth on the inner wall of the pipeline will not be attached by the fouling and anti-moth in the Marine or sewage microbial stations such as shell-shell and fungus.

2) Smooth inner coating, less fluid friction resistance than PCCP and ductile iron pipes.

3) The corrosion resistance of the inner wall of the pipe is better than that of ordinary PCCP and ductile iron pipe.

4) The single-layer polyethylene powder thermal spraying layer on the outer wall of the pipeline has strong soil corrosion resistance and environmental protection.

5) The pipe fittings with complete specifications can adapt to various installation needs.

6) The pipe can be connected by electric welding, clamp and flange.

7) Directly connected electric welding repair and repair method is simple and reliable.

8) The design life of internal and external anti-corrosive coating can reach more than 50 years.

 

Internal epoxy and external polyethylene anti-corrosive steel pipes are coated with corrosion resistance and deformation resistance.The outer coating is made of three-layer polyethylene with uniform coating thickness, which is closely combined with the steel pipe to improve the cathodic protection efficiency.The internal coating adopts thermosetting epoxy, the coating is hygienic and safe, and has no influence on the water quality. It can not only be used in the city supply and drainage pipe network and the long-distance transportation pipeline of tap water, sewage, medium water and sea water of various water quality, but also can be used as the transportation pipeline of oil, gas and mixed medium of oil and gas.And epoxy and polyethylene anti-corrosive steel pipe comprehensive cost is low, is in line with the green, environmental protection, low carbon, energy saving excellent products.With our more than ten years’ experience in pipe coating field,IMRI will surely provide you anti-corrosion coating steel pipes which can meet your needs.

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