Pipeline Coatings | HTLP80
The most widely used girth weld protection system for three-layer coated pipes.
- HTLP80 field-joint coatings.
- Construction: Three-layer system:
- First layer: Liquid epoxy, solvent-free two-component.
- Second layer: High shear strength copolymer adhesive.
- Third layer: Radiation cross-linked, high density polyethylene with PCI (Permanent Change Indicator).
The HTLP80 system is a wrap-around heat-shrinkable sleeve which replicates the structure and performance of mill-applied three-layer PE coatings. HTLP80 also has excellent compatibility and has been extensively used on many other mill-applied coatings. By far the majority of the girth welds worldwide on three-layer coated pipes, diameters up to 100" (DN2500), have been coated with HTLP80.
During installation, the epoxy is applied to the prepared pipe surface and the heat-shrinkable sleeve is immediately wrapped around the joint over the wet epoxy. Heat is then applied to the sleeve which shrinks to form a tight fit around the joint.
While curing, the epoxy forms strong mechanical and chemical bonds to the pipe surface & to the copolymer adhesive layer. The radiation cross-linked outer layer forms a tough barrier against mechanical damage and moisture transmission.
- Fully resistant to shear forces induced by soil and thermal movements
- The HTLP is tough & lasts as long a 3-layer, mill-applied coating.
- Sleeve applied over wet epoxy---allowing formation of strong mechanical & chemical bonds
- Allows fast application, combined with high performance!
- Superior cathodic disbondment and hot water immersion resistance
- Offers the optimum barrier protection against corrosion.
- Fully reconstructs the coating of three-layer coated pipes
- Thus, the HTLP allows the pipeline to have a virtually monolithic coating system.
- Dimpled backing provides a “permanent change" indicator for application of heat
- Ensures correct application heat & allows easy post-heat inspection.
- Reliable inspectability at any time.
Product selection guide
- Max operating temperature
- 85°C (185°F)
- Compatible line coatings
- PE, FBE, Coal Tar,DFBE
- Min preheat temperature
- 70°C (158°F)
- Recommended pipe preparation
- SA 2½
- Soil stress restrictions
- EN 12068
- C60 UV
- C80 UV