HTLP Wrap-around Sleeve & Epoxy System
The most widely used girth weld protection system for three-layer coated pipes.
Product description:
HTLP60, 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 HTLP system is a wrap-around heat-shrinkable sleeve which replicates the structure and performance of mill-applied three-layer PE coatings. HTLP 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 HTLP.
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.
Product features/benefits:
• 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:
HTLP60
Max operating temperature: 65°C (149°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 C50
HTLP80
Max operating temperature: 80°C (176°F)
Compatible line coatings: PE, 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
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