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3LPE Coated Pipes

Pipes

3LPE Coated Pipes
Three-layer Polyethylene (3LPE) coating in accordance to DIN 30670
 
A three-layer polyethylene coat (3LPE) is multilayer, anti-corrosive steel pipe coating. The three layers consist of an Epoxy layer followed by an adhesive layer and a polyethylene layer, as illustrated in figure 1:
 
 
figure 1
 
⦁ Epoxy layer: protects the steel portion and improves the adhesive surface.
⦁ Adhesive layer: improves the adhesion of the polyethylene layer for the epoxy layer and increase its resistance to peeling. 
⦁ Polyethylene layer: Protects the pipe from any mechanical damage or corrosion, and works as an electric insulator to the steel pipe.
 
Features and Benefits:
 
The 3LPE is designed to provide long-term protection to the underground steel pipes, and fights against corrosion caused by soil minerals.
The layers provide tough and durable protection for pipes.
Mechanical Protection: The Polyethylene layer protects the pipes during transportation and installation, which consequently reducing costly repairs. 
It also offers strong chemical resistance that makes 3LPE applicable even in the most aggressive of environments, including all forms of soil. The chemical resistance of this coating prevents corrosion.
3LPE can be applied on the outer surface of both black and galvanized steel pipes.
 
Production Stages:              
 ⦁ Steel pipes are fully cleaned of dirt and scales using the shot blasting method.  
⦁ The pipes are heated using an induction heater set to the suitable temperature, so that the Epoxy powder adheres to the pipe’s outer surface, forming the epoxy layer.
⦁ Epoxy powder is applied to the pipe’s surface by an electro–static spray process to a minimum thickness of 60 microns.   
⦁ A special PE adhesive layer is applied to the pipe’s surface using the extrusion method. This layer provides good adhesion between the epoxy layer and the polyethylene, at a minimum thickness of 140 microns.
⦁ A Polyethylene layer is then applied using the extrusion method according to the exact specifications and technical requirements. The Polyethylene layer provides protection against mechanical damage and other environmental factors. 
⦁ The pipe is cooled immediately after extrusion for safe handling and inspection. 
⦁ A special machine performs 100 mm cut-back. 
⦁ Marking and packing is completed for easy traceability and 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