Heat-Shrinkable Double-Layer Cuff (1422 × 450 × 2.4 mm)

DIN EN 12068 Compliant | Large-Diameter Pipeline Field Joint Protection

Product Overview

Our Heat-Shrinkable Double-Layer Cuff is a high-performance wraparound sleeve engineered for the corrosion protection of field joints on large-diameter steel pipelines. With a specified dimension of 1422 mm × 450 mm × 2.4 mm, this cuff is designed for DN 1400 (1422 mm OD) pipelines, providing reliable sealing, mechanical protection, and long-term corrosion resistance in buried and submerged service conditions.

Manufactured in accordance with DIN EN 12068, this double-layer system combines a cross-linked polyolefin backing with a high-performance hot-melt adhesive, delivering consistent performance across a wide range of operating temperatures and soil environments.

Product Specifications

System Construction

The double-layer construction provides a balance of mechanical strength, flexibility, and adhesive performance:

The cross-linked backing provides the shrink force required to conform tightly to the pipe surface, while the adhesive flows under heat to form a continuous bond to the prepared steel and adjacent plant coating.

Key Features & Benefits

Typical Properties (Reference)

Values are indicative and shall be confirmed against the specific product data sheet and the applicable EN 12068 class.

Compliance with DIN EN 12068

DIN EN 12068 specifies requirements for external organic coatings for the corrosion protection of buried or immersed steel pipelines used in connection with cathodic protection. The standard classifies coatings by their mechanical and thermal performance, with designations such as C30, C50, C60, C80, and C100 indicating the maximum operating temperature and mechanical class.

A 2.4 mm double-layer heat-shrinkable cuff in the 1422 mm width range is typically specified for large-diameter transmission pipelines where mechanical protection and long-term sealing are critical. The product is tested and certified to the applicable EN 12068 class based on the project's temperature and mechanical requirements.

Primary Applications

• Large-diameter transmission pipelines – Field joint corrosion protection for DN 1400 (1422 mm OD) pipelines

• Buried and submerged service – Onshore and offshore pipeline joints

• High-capacity gas and oil transmission – Mainline field joints where mechanical protection is essential

• Coating repair and rehabilitation – Restoration of damaged plant coating at joint areas

• Compatible plant coatings – PE, PP, FBE, and bitumen mainline coatings

Installation Summary

1. Surface Preparation: Abrasive blast clean the steel cutback to Sa 2½ or equivalent; clean and roughen the adjacent plant coating overlap zone.

2. Preheat: Preheat the steel surface to the manufacturer's recommended temperature.

3. Position Cuff: Wrap the heat-shrinkable cuff around the joint, centering it over the weld with equal overlap onto the plant coating on both sides.

4. Apply Closure Patch: Secure the closure patch along the overlap, ensuring the seam is fully sealed.

5. Shrink: Apply heat uniformly with a propane torch, working from the center outward, until the backing shrinks down and adhesive flows at the edges.

6. Inspect: Visually inspect for wrinkles, voids, or lifted edges; verify adhesive flow at the overlap and closure seam.

Packaging and Availability

• Dimensions: 1422 mm × 450 mm × 2.4 mm (customizable to project requirements)

• Configuration: Wraparound cuff with closure patch

• Packaging: Individually wrapped rolls in cartons

• Customization: Other pipe sizes, widths, and thicknesses available on request

CNpetro — Protecting pipelines. Advancing performance.

For product data sheets, EN 12068 compliance certificates, or project-specific technical consultation, please contact our sales team.