Covalence WPCT: Product Overview and Frequently Asked Questions
Covalence (formerly Raychem) WPCT is a widely recognized solution for field-joint corrosion protection in pipelines. Originally developed by Raychem, a pioneer in heat-shrinkable technology, Covalence WPCT continues to set industry standards for reliability and ease of use in pipeline protection applications.
Product Overview
What is Covalence WPCT?
Covalence WPCT is a two-layer, wraparound, heat-shrinkable sleeve system designed for corrosion protection of field girth weld joints in distribution and transmission pipelines. It is suitable for pipelines operating at ambient and moderately elevated temperatures, up to 140°F (60°C).
Key Features:
Two-Layer Construction:
First Layer: Visco-elastic butyl-based low preheat adhesive.
Second Layer: Radiation cross-linked, high-density polyethylene with a Permanent Change Indicator (PCI) for correct installation verification.
No primer required; the sleeve is wrapped around the cleaned and preheated pipe surface and then shrunk using a heat source, forming a tight, protective fit.
Compatibility: Works with all standard pipe coatings and can be used on bare replacement sections or large-radius bends.
Application: Designed for ease of installation with minimal preheating, making it ideal for large diameter water pipes and standard buried applications (not recommended for road bores or directional drilling).
Corrosion Protection: The adhesive flows during installation to bond with the pipe, while the outer layer provides a durable barrier against mechanical damage and moisture ingress.
Frequently Asked Questions (FAQ)
1. What does WPCT stand for?
WPCT stands for "Wraparound Pipe Coating with Thermal indicator," referencing its wraparound, heat-shrinkable design for pipe joint protection.
2. What temperatures can WPCT withstand?
WPCT is rated for pipelines operating at temperatures up to 140°F (60°C).
3. Is a primer required for installation?
No primer is needed. The system is designed for direct application to cleaned and preheated pipe surfaces, simplifying installation and reducing labor time.
4. How do I know if WPCT has been installed correctly?
The sleeve features a dimpled backing that smooths out when heated, serving as a Permanent Change Indicator (PCI) to visually confirm proper installation.
5. What pipeline coatings is WPCT compatible with?
WPCT is compatible with all standard pipeline coatings, including those commonly used for distribution and transmission systems.
6. Can WPCT be used for directional drilling or road bores?
WPCT is not recommended for high-shear or high-stress environments such as road bores or directional drilling. For such applications, higher-performance sleeves like DIRAX are required.
7. What pipe sizes are supported?
WPCT is available in standard widths (11", 17", 24", 34") and can be custom-sized to fit any pipe diameters.
8. What are the main benefits of using WPCT?
Fast, primerless installation
Reliable corrosion protection
Visual installation indicator (PCI)
Compatibility with standard coatings
Durable, mechanical and moisture barrier
9. Who manufactures Covalence WPCT?
Covalence is a brand under Seal For Life Industries, carrying forward the legacy of Raychem’s heat-shrinkable technology.
10. What is the history of Covalence and Raychem?
Raychem, founded in 1957, pioneered heat-shrinkable tubing and related technologies. The Covalence brand continues this legacy, offering advanced pipeline protection products worldwide.
Summary Table: Covalence WPCT Key Facts
| Feature | Description |
|---|---|
| Product Type | Two-layer, heat-shrinkable wraparound sleeve |
| Application | Field girth weld joints, replacement sections, bends |
| Temperature Range | Up to 140°F (60°C) |
| Installation | No primer, minimal preheat, PCI visual indicator |
| Compatibility | Most standard pipe coatings |
| Recommended Use | Standard buried pipelines, not for HDD/road bores |
| Sizes | 11", 17", 24", 34" widths; custom sizes available |
Covalence WPCT remains a trusted, efficient solution for pipeline corrosion protection, combining ease of installation with proven field performance.
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