2LPE Coated Pipe

2LPE Coated Pipe

2LPE Coated pipe is a two-layer coated pipe made up of two functional components: Mastic-based adhesives and polyethylene copolymers.

Oil and gas pipeline coatings have evolved over the last 70 years from hot asphalt and coal tar or asphalt enamels to highly designed polymer coatings. These advancements enable pipe coating solution suppliers to provide a variety of solutions adapted to their client’s specific requirements. Among these popular pipeline coating materials are 2LPP (two-layer polyethylene) coating systems that offer superior anti-corrosion protection for pipelines.

 PRODUCT FEATURES

Layers of 2LPE Coated Pipe

Two-layer extruded polyethylene coated (2LPE) pipe refers to pipelines with two-layer anti-corrosion protection. Mastic-based adhesives and polyethylene copolymers are used to create the two-layer structure. This provides superior corrosion resistance, particularly at extreme temperatures.

Mastic-based bonding agents are very affordable and exhibit exceptional resistance to cathodic disbandment (CD). Additionally, they have a low peel and shear strength, limiting their use to low temperature applications. On the other hand, two-layer extruded polyethylene coatings coupled with copolymers provide superior shear resistance and adhesion but generally exhibit low CD resistance.

The Advantage of 2LPE Coating Mastic Adhesives

Two-layer coating systems are frequently comprised of two distinct adhesives. The adhesives’ qualities will define which kind is most suited to the demands of specific sectors. Each substance offers a unique set of benefits.

Mastic adhesives have the following advantages:

  • Low manufacturing costs
  • Amorphous and sensitive to pressure
  • Temperature application and surface preparation are forgiving
  • CD resistance that is acceptable
  • Excellent repellent to water
  • Simple application

Performance of 2LPE Coated Pipe

No.

Item

Performance Indicators

1

Tensile Strengh

Axial Direction, Mpa

≥20

Circumferential Direction, Mpa

≥20

Deviation, %

≤15

2

Elongation after Fracture, %

≥600

3

Indentation Hardness (mm)

23℃

≤0.2

50℃ or 70℃

≤0.3

4

Endurably Environmental Stress Cracking (F50),h

≥1000

History of 2LPE Coating

Oil and gas pipeline coatings have evolved over the last 70 years from hot asphalt and coal tar or asphalt enamels to highly designed polymer coatings. These advancements enable pipe coating solution suppliers to provide a variety of solutions adapted to their clients’ specific requirements. Two-layer systems refer to coatings comprised of an adhesive layer and a polyethylene layer.

Mastic adhesives or functionalized polyolefin-based adhesives are utilized in two-layer polyethylene (2LPE) systems. Mastic adhesives, despite their low cost and high resistance to cathodic disbondment, have poor shear and peel strengths, limiting their usage to low temperature applications. Two-layer PEs based on functionalized polyolefins have excellent adhesion and shear resistance but usually have a low resistance to cathodic disbondment.

2LPE coating technologies have developed over the last 40 years to meet the evolving demands of the pipeline business. This includes the creation of an adhesive in the 1980’s to withstand greater operating temperatures and a harder high-density polyethylene (HDPE) outer layer in the 1990’s to withstand damage during handling and storage.

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