3LPP-Compatible Wrap-Around Heat Shrink Sleeve
ISO 21809-3 System 14D-1 | 3 mm Total System Thickness | 450 mm Shrinkage Width
Product Overview
Our 3LPP-Compatible Wrap-Around Heat Shrink Sleeve is a high-performance, three-layer field-joint coating system designed specifically for the corrosion protection of welded joints on three-layer polypropylene (3LPP) coated pipelines. Qualified to ISO 21809-3 System 14D-1, this sleeve delivers a total system thickness of 3 mm and a post-shrinkage width of 450 mm, ensuring full coverage of the weld and cutback with sufficient overlap onto the adjacent 3LPP plant coating.
The system is engineered to match the thermal and mechanical performance of 3LPP mainline coatings, making it suitable for high-temperature and high-mechanical-stress pipeline applications where standard PE-based sleeves are inadequate.
Product Specifications
| Parameter |
Specification |
| Product Type |
3LPP-compatible wrap-around heat shrink sleeve |
| Standard |
ISO 21809-3 System 14D-1 |
| Total System Thickness |
3 mm |
| Sleeve Width After Shrinkage |
450 mm |
| Configuration |
Wrap-around with closure patch |
| Compatible Mainline Coating |
3LPP (three-layer polypropylene) |
| Service |
Buried, submerged, and above-ground pipelines |
System Construction
The 3LPP-compatible system consists of three integrated layers that together reproduce the performance of the factory-applied 3LPP coating at the field joint:
| Layer |
Component |
Function |
| First Layer |
Two-component liquid epoxy primer |
Bonds to blast-cleaned steel; provides primary corrosion barrier and cathodic disbondment resistance |
| Second Layer |
High-shear-strength polypropylene-compatible hot-melt adhesive |
Bonds to the epoxy primer and to the adjacent 3LPP plant coating; maintains shear strength at elevated temperatures |
| Third Layer |
Radiation cross-linked polypropylene backing |
Mechanical protection, thermal stability at high temperatures, moisture barrier |
The total system thickness of 3 mm provides robust mechanical protection while remaining conformable to the pipe surface during shrink application.
Key Features & Benefits
| Feature |
Benefit |
| ISO 21809-3 System 14D-1 Qualified |
Meets the international standard for heat-shrinkable field-joint coatings on 3LPP pipelines |
| 3LPP Compatibility |
Adhesive and backing are formulated to bond to and perform with polypropylene mainline coatings |
| 3 mm Total System Thickness |
Provides mechanical protection equivalent to the 3LPP plant coating |
| 450 mm Shrinkage Width |
Ensures full coverage of the weld and cutback with adequate overlap onto plant coating |
| High-Temperature Performance |
Suitable for elevated service temperatures where 3LPP coatings are specified |
| Wrap-Around Design |
Installed over completed welds without sliding over the pipe end |
| Closure Patch Included |
Ensures a secure, sealed overlap for continuous corrosion protection |
Typical Properties (Reference)
| Property |
Typical Value |
| Backing Material |
Radiation cross-linked polypropylene |
| Adhesive Type |
Polypropylene-compatible hot-melt adhesive |
| Total System Thickness |
3 mm (confirmed) |
| Sleeve Width After Shrinkage |
450 mm (confirmed) |
| Backing Tensile Strength |
≥ 20 MPa |
| Backing Elongation at Break |
≥ 400% |
| Adhesive Softening Point |
≥ 120°C |
| Peel Strength to Steel |
Per ISO 21809-3 System 14D-1 requirements |
| Cathodic Disbondment |
Per ISO 21809-3 System 14D-1 requirements |
| Impact Resistance |
Per ISO 21809-3 System 14D-1 requirements |
| Indentation Resistance |
Per ISO 21809-3 System 14D-1 requirements |
Values are indicative and shall be confirmed against the specific CNPetro product data sheet and ISO 21809-3 qualification test reports.
Compliance with ISO 21809-3 System 14D-1
ISO 21809-3 specifies requirements for field-joint coatings on buried and submerged pipelines in the petroleum and natural gas industries. System 14D-1 designates a heat-shrinkable, three-layer coating system with a polypropylene backing and polypropylene-compatible adhesive, qualified for high-temperature service on 3LPP mainline coatings.
The system is tested to the requirements of this classification, including:
-
Peel strength to steel and to the plant coating at 23°C and at maximum design temperature
-
Cathodic disbondment resistance at maximum design temperature
-
Impact and indentation resistance
-
Thermal ageing resistance
Primary Applications
3LPP-coated pipeline field joints – Girth welds, tie-ins, and repair areas
High-temperature pipelines – Where 3LPP mainline coatings are specified for elevated service temperatures
Buried and submerged pipelines – Onshore and offshore environments
High-mechanical-stress applications – Where the 3 mm system thickness provides necessary protection
Pipeline rehabilitation – Restoration of damaged field-joint coatings on 3LPP lines
Application Summary
Surface Preparation: Abrasive blast clean the steel cutback to Sa 2½ or equivalent; clean and roughen the adjacent 3LPP plant coating overlap zone.
Preheat: Preheat the steel surface to the manufacturer’s recommended temperature.
Apply Epoxy Primer: Mix two-component epoxy and apply to the prepared steel at the specified thickness.
Position Sleeve: Wrap the heat-shrinkable sleeve around the joint, centering over the weld with equal overlap onto the 3LPP plant coating on both sides.
Apply Closure Patch: Secure the closure patch along the overlap, ensuring the seam is fully sealed.
Shrink: Apply heat uniformly with a propane torch, working from the center outward, until the backing shrinks and adhesive flows at the edges.
Inspect: Verify complete shrinkage, adhesive flow, and absence of voids or lifted edges. Confirm final shrinkage width of 450 mm.
Packaging and Availability
| Item |
Details |
| Configuration |
Wrap-around sleeve with closure patch |
| System Thickness |
3 mm total |
| Shrinkage Width |
450 mm |
| Customization |
Project-specific dimensions available on request |
CNPetro — Protecting pipelines. Advancing performance.
For product data sheets, ISO 21809-3 System 14D-1 qualification reports, or technical consultation, please contact our sales team.
Keywords: 3LPP compatible heat shrink sleeve, ISO 21809-3 System 14D-1, wrap-around sleeve, 3 mm system thickness, 450 mm shrinkage width, polypropylene field joint coating, high-temperature pipeline protection
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