Three-Layer PE Heat Shrink Sleeve (3LPE Field Joint Coating)
The Three-Layer PE Heat Shrink Sleeve delivers mechanical protection and corrosion prevention for steel pipeline field girth welds. Engineered to match factory-applied 3LPE coatings, this system integrates a solvent-free liquid epoxy primer, a co-extruded copolymer adhesive, and a radiation-crosslinked high-density polyethylene backing. It forms a continuous, bonded moisture and cathodic disbondment barrier for onshore and offshore pipeline networks. Compliant with international infrastructure standards including ISO 21809-3, EN 12068, and AWWA C216.
Key Features
Continuous Corrosion Barrier: Triple-layer composition chemically and mechanically bonds steel, epoxy, and PE to prevent moisture ingress and soil stress corrosion.
High Peel Strength: Maintains structural adhesive bond integrity across fluctuating ground operating temperatures.
Mechanical Resilience: Withstands backfill impact, rock impingement, and soil shear stresses during shifting ground conditions.
Thermal Shrink Memory: Controlled transverse recovery ensures uniform wall thickness and tight conformity around irregular weld bead profiles.
Field Installation Efficiency: Applied using standard propane torches with clear visual heat-sensitive shrinkage indicators.
Technical Specifications
|
Property |
Test Method |
Typical Value (Class B / ) |
Typical Value (Class C / ) |
|
Backing Thickness |
ISO 21809-3 |
1.0 mm – 1.5 mm |
1.2 mm – 1.8 mm |
|
Total Thickness (As Shrunk) |
ISO 21809-3 |
2.0 mm – 2.5 mm |
2.3 mm – 3.0 mm |
|
Peel Strength () |
ISO 21809-3 |
||
|
Peel Strength (Maximum Operating Temp) |
ISO 21809-3 |
() |
() |
|
Cathodic Disbondment () |
EN 12068 |
||
|
Impact Resistance |
EN 12068 |
||
|
Indentation Hardness |
ISO 21809-3 |
||
|
Volume Resistivity |
ASTM D257 |
Coating Structure Profile: Steel Pipe Substrate (Sa 2.5) → Liquid Epoxy Primer (≥ 150 μm) → Copolymer Adhesive → Radiation-Crosslinked PE Backing
Materials & Available Options
Backing Material: Electron-beam crosslinked high-density polyethylene (HDPE).
Primer Component: Two-component solvent-free liquid epoxy or moisture-cured liquid epoxy.
Adhesive Layer: High-performance grafted copolymer adhesive.
Size Range: Fits pipe diameters from DN 100 (4 inches) to DN 1420 (56 inches). Custom widths available upon project request.
Closure Patches: Fiber-reinforced heat-shrinkable closure patches supplied separately or pre-attached.
Applications
Oil & Gas Transmission: Onshore buried steel pipelines and girth weld field joint protection.
Water Infrastructure: Municipal water transmission mains meeting AWWA standards.
District Heating: Pre-insulated steel pipe joint sealing and corrosion protection.
Specialty Crossings: HDD (Horizontal Directional Drilling) pull sections requiring enhanced shear and abrasion resistance.
Customization Options
Width & Length Dimensions: Cut precisely to match pipe circumference and minimum factory overlap requirements.
Closure Patch Configuration: Supplied as independent patches or pre-installed unit assemblies to accelerate field wrapping.
Primer Packaging: Available in standard 1L, 5L, or complete project-specific kit sets including mixing paddles and application brushes.
Private Labeling: Custom laser-etched printing on sleeve backing including project reference numbers, pipe dimensions, and batch codes.
Quality Control & Manufacturing Capability
Production utilizes automated compounding extruders and electron-beam crosslinking units to guarantee uniform molecular density across every production roll.
In-House Testing: Every production lot undergoes destructive peel adhesion testing, thickness verification, elongation testing, and shrink ratio analysis in our certified laboratory.
Traceability: Laser-etched batch numbers on the sleeve backing link directly to raw material test certificates and extrusion logs.
Compliance: Manufacturing processes operate under ISO 9001 quality management systems, meeting ISO 21809-3, EN 12068, and AWWA C216 performance benchmarks. Third-party inspection (SGS, BV, TUV) supported upon request.
Packaging & Shipping
Packaging: Sleeves are rolled, packed in heavy-duty corrugated cartons, and secured on fumigation-free wooden pallets wrapped in moisture-resistant PE film.
Storage Requirements: Store in a dry, ventilated environment below 40°C, protected from direct sunlight and UV exposure.
Shelf Life: 24 months for sleeves; 12 months for liquid epoxy primer.
Shipping Terms: EXW, FOB, CIF, or DDP via ocean freight or air cargo. Standard export documentation includes Mill Test Certificates (MTC), Packing Lists, and Commercial Invoices.
Frequently Asked Questions
Q: What pipe operating temperatures are supported by this sleeve?
A: Standard formulations support continuous operating temperatures up to 80°C (Class B). High-temperature variants formulated for up to 100°C (Class C) are available for high-enthalpy pipeline projects.
Q: Is liquid epoxy primer mandatory for installation?
A: Yes. The two-component liquid epoxy primer is a core structural component of the 3LPE system, providing active corrosion inhibition on the bare steel surface and high-strength bonding for the adhesive layer.
Q: What equipment is needed for field installation?
A: Installation requires abrasive blasting equipment (to achieve Sa 2.5), a wet-film thickness gauge, a propane torch or gas heating rig, temperature-indicating crayons, and a silicon rubber roller for air-pocket removal.
Q: Can these sleeves be applied on damp steel surfaces?
A: No. The steel surface temperature must be at least 3°C above the dew point, and the surface must be completely dry, clean, and free of oil or dust prior to epoxy application.
Q: What is the standard shelf life of the epoxy primer and sleeves?
A: The liquid epoxy primer has a shelf life of 12 months when stored properly. The heat shrink sleeves maintain mechanical and adhesive properties for up to 24 months.
Q: Do you provide third-party inspection reports with shipments?
A: Yes. Each shipment includes a comprehensive lot-specific test report covering peel strength, thickness, and elongation. Independent laboratory testing reports (SGS/BV) are available for submittal packages.
Request a Quote (RFQ)
To receive a technical proposal and quotation for your pipeline project, please submit the following specifications:
Pipeline Outer Diameter (OD):
Design Operating Temperature:
Total Quantity (Number of Girth Weld Joints):
Applicable Standard (e.g., ISO 21809-3, EN 12068, AWWA C216):
Destination Port / Project Location:
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