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Tuesday, May 30, 2023

HTLP80: An Excellent Three-Layer Polyethylene Pipe Coating

 HTLP80: An Excellent Three-Layer Polyethylene Pipe Coating

When it comes to girth weld protection systems for three-layer coated pipes, HTLP80 stands out as the most widely used solution. HTLP80 is a highly effective three-layer polyethylene pipe coating that provides exceptional protection for pipeline girth welds. This product has gained widespread recognition and is trusted by industry professionals around the world. Let's delve into the features, benefits, and specifications that make HTLP80 an excellent choice for pipeline coating.

Product Description: HTLP80 is part of the HTLP series, which includes HTLP60 and HTLP80 field-joint coatings. The construction of HTLP80 comprises a three-layer system:

  1. First Layer: Liquid Epoxy - This solvent-free, two-component epoxy acts as the initial layer, applied directly to the prepared pipe surface.

  2. Second Layer: High Shear Strength Copolymer Adhesive - The copolymer adhesive provides excellent bonding properties and enhances the overall strength of the coating.

  3. Third Layer: Radiation Cross-Linked, High-Density Polyethylene (PE) with PCI - The outer layer consists of radiation cross-linked, high-density polyethylene, which offers a tough barrier against mechanical damage and moisture transmission. It includes a Permanent Change Indicator (PCI) for easy post-heat inspection.

HTLP80 is designed as a wrap-around heat-shrinkable sleeve, emulating the structure and performance of mill-applied three-layer PE coatings. It also exhibits remarkable compatibility and can be used with various other mill-applied coatings.

Product Features and Benefits:

  1. Superior Resistance: HTLP80 is fully resistant to shear forces induced by soil and thermal movements. It withstands external stressors, ensuring long-term durability and reliability.

  2. Strong Mechanical and Chemical Bonds: During installation, the epoxy layer creates strong mechanical and chemical bonds to the pipe surface and copolymer adhesive. This combination enhances the overall strength and performance of the coating.

  3. Optimum Corrosion Protection: HTLP80 offers superior cathodic disbondment resistance and excels in hot water immersion tests. It provides an effective barrier against corrosion, ensuring the longevity of the pipeline.

  4. Monolithic Coating System: By reconstructing the coating of three-layer coated pipes, HTLP80 enables the pipeline to have a virtually monolithic coating system. This seamless protection further enhances the integrity of the pipeline.

  5. Easy Inspection and Application: The dimpled backing of HTLP80 serves as a "permanent change" indicator for the application of heat. It ensures correct heat application and allows for easy post-heat inspection, providing reliable inspectability at any time.

Product Selection Guide: HTLP80 is specifically designed for higher operating temperatures compared to its counterpart, HTLP60. Here is a summary of the selection guide for HTLP80:

  • Max Operating Temperature: 80°C (176°F)
  • Compatible Line Coatings: PE, PP, FBE, Coal Tar
  • Min Preheat Temperature: 70°C (158°F)
  • Recommended Pipe Preparation: SA 2½
  • Soil Stress Restrictions: None
  • Performance: EN 12068 Class C60 UV, Class C80 UV

Product Properties: HTLP80 exhibits excellent physical properties, as outlined below:

  • Backing:

    • Tensile Strength: 3000 psi (20 MPa)
    • Elongation: 580%
    • Hardness (Shore D): 55
    • Shrink Force: 40 psi
    • Dielectric Strength: 500 volts/mil (20 kV/mm)
    • Moisture Absorption: 0.05%
  • Adhesive:

    • Softening Point: 120°C (248°F)

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