3LPE Coated Pipes



Three layer Polyethylene (3LPE) coating according to DIN 30670

 

A three-layer polyethylene coating (3LPE) is multilayer, anti-corrosive steel pipe coatings. The three layers consist of Epoxy layer followed by Adhesive layer and Polyethylene layer as in figure 1:

Figure 1

  1. Epoxy layer: protects the steel and improves the adhesive surface.
  2. Adhesive layer: improves the adhesion of the polyethylene layer for epoxy layer and increase its resistance to peeling. 
  3. Polyethylene layer: Protects the pipe from any mechanical damage or corrosion, and works as an electric insulator to the steel pipe.

 

Features and Benefits:

 

  • A 3LPE designed to provide maximum long-term protection to steel pipes buried underground against corrosion caused by soil minerals.

 

  • The layers provide tough and durable protection for pipes.

 

  • Good Mechanical Protection: Polyethylene layer protects pipes during transportation and installation, thereby reducing costly repairs.

 

  • Strong chemical resistance that makes 3LPE applicable even in the most aggressive environments, including all forms of soil. The chemical resistance of this coating prevents its corrosion.

 

  • 3LPE can applied on outer surface of both black and galvanized steel pipes.

 

 

Production Stages:              

 

  1. Steel pipes fully cleaned of any dirt and scales by shot blasting.
  2. The pipes heated, using Induction heater, to a suitable degree, so that the Epoxy powder adheres to the pipe outer surface forming the epoxy layer.
  3. Epoxy powders applied to pipe surface by electro–static spray process to a minimum thickness of 60 microns.   
  4. Special PE adhesive layer applied to the pipe surface by extrusion method. This layer provides a good adhesion between epoxy layer and polyethylene, minimum thickness is 140 microns.
  5. Polyethylene layer applied by extrusion method according to specification and technical requirement. Polyethylene layer provides protection against mechanical damage and environmental factors.
  6. Pipe cooled immediately after extrusion for safe handling and inspection.
  7. A special machine does a length of 100 mm cut back.
  8. Marking & packing done for easy traceability & storage.

 

 

 

Polyethylene coating thickness:

Nominal Size

Minimum Thickness ( mm)

Normal ( N )

    2"

1.80

    4"

1.80

    6"

2.00

    8"

2.00

    10"

2.00

 

 

 

Internal Lining:

 

  • Zinc by Hot Dip Galvanizing process.
  • Cement.

 

 Zinc internal Lining vs. Cement Lining:

 

Hot Dip Galvanization

(Zinc ) lining

Cement Lining

Weight

Light

Heavy

Corrosion Resistance

High

Low

Internal diameter

Large

Narrow

Liquid flow rate

high

low

Adhesion

High

Low (cement is fragile)

Handling and installation

Easy (less weight)

Difficult due to heavy weight

Mechanical impact resistance

High

Low

Life cycle

Long

Short

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