Weld Joint Heat Shrink Sleeve - Product Page Content
The Weld Joint Heat Shrink Sleeve is a wraparound corrosion protection system engineered for field-welded girth joints in steel pipelines. Comprising a radiation cross-linked high-density polyethylene (HDPE) backing and a high-performance hot-melt adhesive, the sleeve shrinks radially upon torch heating. The adhesive melts, flows, and bonds aggressively to the steel pipe and factory-applied coatings (PE, FBE, PP), creating a durable barrier against moisture, soil stress, and cathodic disbondment. Designed for pipeline operating temperatures up to 80°C or 100°C.
Key Features
High Peel Adhesion: Forms a robust molecular bond with FBE and PE mainline coatings, preventing moisture migration at the cutback edge.
Controlled Shrinkage: Balanced longitudinal and radial shrinkage ensures uniform thickness across the weld bead and transition zones.
Shear and Impact Resistance: Withstands backfill soil stress, ground settlement, and directional drilling friction without puncture.
Moisture and Chemical Barrier: Impermeable to water vapor, acids, alkalis, and soil bacteria.
Visual Indication: Backing material exhibits a clear color change or surface texture shift upon reaching proper installation temperature, reducing operator error.
Technical Specifications
|
Property |
Test Method |
Typical Value |
|
Backing Thickness |
ISO 21809-3 |
1.0 mm - 2.5 mm (Customizable) |
|
Adhesive Thickness |
ISO 21809-3 |
0.8 mm - 1.5 mm |
|
Peel Strength (23°C) |
EN 12068 / ISO 21809-3 |
≥ 40 N/cm (on PE/FBE) |
|
Cathodic Disbondment (65°C, 30 days) |
ASTM G95 |
< 6 mm radius |
|
Tensile Strength |
ASTM D638 |
≥ 20 MPa |
|
Elongation at Break |
ASTM D638 |
≥ 400% |
|
Impact Resistance |
EN 12068 |
≥ 15 J |
|
Operating Temperature |
Operational |
Up to 80°C (Class B80) or 100°C (Class C100) |
Materials & Available Options
Backing Material: Electron-beam cross-linked radiation HDPE.
Adhesive Layer: Viscoelastic hot-melt sealant specifically formulated for compatibility with FBE, PE, and PP mainline coatings.
Closure Patch: Fiber-reinforced heat-shrinkable patch secured across the overlapping seam during installation.
Available Sizes:
- Fits pipeline diameters from 2 inches to 56 inches (60 mm to 1422 mm).
- Supplied in bulk rolls or pre-cut lengths matched to specific pipe circumferences.
- Accessories: Low-profile closure patches, epoxy primer kits (two-component solvent-free liquid epoxy), and roller application tools.
Applications
Onshore Oil & Gas Transmission: Girth weld corrosion protection for buried and above-ground steel pipelines.
Water and Wastewater Networks: Ductile iron and steel pipeline joints in aggressive soil conditions.
District Heating / Pre-insulated Pipes: Joint sealing for pre-insulated steel pipe systems.
Offshore & Coastal Transitions: Splash zone and marshland pipeline crossing protection (when paired with proper mechanical shields).
Manufacturing Context: Produced via co-extrusion lines with inline corona treatment and automated radiation cross-linking accelerators, ensuring uniform gel fraction and consistent adhesive coating weight across every batch.
Customization Options
Width & Length: Custom cut lengths to match exact pipe cutback dimensions and overlap requirements.
Adhesive Weight / Thickness: Adjusted for high-temperature service classes or rough surface profiles.
Color Coding: Standard black, white, or yellow; custom branding/logos printed on the backing upon request.
Packaging Formats: Supplied as complete kits (Sleeve + Closure patch + Epoxy primer + Mixing tools) tailored for specific project spreads.
Quality Control
Raw Material Verification: Melt Flow Index (MFI) and density tests performed on incoming virgin polyolefin resins and adhesive polymers.
In-Line Monitoring: Automated thickness gauges control backing and adhesive extrusion tolerance within ±5%.
Laboratory Testing: Every production lot undergoes peel strength, tensile elongation, and cathodic disbondment testing in our internal testing facility.
Third-Party Inspection: Factory audits and pre-shipment inspections accepted from SGS, BV, TÜV, and LR. Compliance with ISO 21809-3, EN 12068, and AWWA C216 standards.
Packaging & Shipping
Packaging: Sleeves are interleaved with release film, rolled, and packed in heavy-duty corrugated cartons or moisture-resistant wooden crates to prevent deformation during transit.
Storage Conditions: Store in dry, ventilated areas below 40°C, away from direct sunlight and heat sources. Shelf life: 24 months.
Shipping: Port loading from Qingdao/Shanghai with containerized sea freight or air freight for urgent site replenishment. Export documentation includes Mill Test Certificates (MTC) and TPI reports.
Frequently Asked Questions
Q: What pipe surface preparation is required before installing the sleeve?
A: The steel surface must be abrasive blasted to ISO 8501-1 Sa 2.5 with a surface profile of 50 - 85 μm. Pre-heat the bare steel to the specified temperature (typically 60°C - 80°C) using a propane torch prior to applying the liquid epoxy primer.
Q: Can these sleeves be installed over factory-applied FBE and PE coatings?
A: Yes. The factory coating cutback area must be lightly abraded, cleaned, and wiped free of dust and grease to ensure optimal adhesive anchorage.
Q: What is the recommended torch type for shrinking the sleeves?
A: Propane or butane ring torches with adjustable flame intensity are recommended. Heating should start from the center of the sleeve and circumferentially move toward both edges to prevent air entrapment.
Q: How do you prevent edge lifting or blisters during application?
A: Ensure the steel pipe is preheated to the correct minimum temperature so the hot-melt adhesive melts uniformly. Use a roller immediately after shrinking while the sleeve is still hot to eliminate trapped air bubbles and ensure edge drawdown.
Q: Do you provide liquid epoxy primer with the sleeves?
A: Yes. We supply solvent-free, two-component liquid epoxy primer packaged in matched sets (Part A and Part B) sized proportionally to the sleeve quantities ordered.
Q: What third-party test reports are available for your heat shrink sleeves?
A: We provide complete type test reports issued by independent laboratories confirming compliance with ISO 21809-3 and EN 12068 standards, along with batch-specific MTCs.
Request a Quote (RFQ)
To receive a precise technical proposal and commercial quotation, please provide the following project details:
Pipeline Outer Diameter (OD) & Wall Thickness
Mainline Coating Type (FBE, 3LPE, 3LPP, or Coal Tar)
Design Operating Temperature
Applicable Standard / Specification Requirement (e.g., ISO 21809-3, EN 12068)
Total Quantity / Number of Joints Required
Target Delivery Port / Destination
[Submit RFQ / Contact Technical Sales]
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