High-temperature resistant heat shrinkable sleeves are essential components in pipeline construction and maintenance, providing effective corrosion protection and mechanical support. These sleeves are typically made from cross-linked polyolefin materials, which exhibit excellent thermal stability and resistance to various environmental factors.
Composition and Functionality
Heat shrinkable sleeves are designed to fit snugly around the joints of pipelines, particularly at field welds where protective coatings may be compromised. The sleeves start as thick extruded sheets that undergo a cross-linking process, enhancing their durability and elasticity. When heat is applied, these sleeves shrink to conform tightly to the surface of the pipeline, creating a robust barrier against moisture and other corrosive elements. This process not only seals the joints but also protects against mechanical stress and abrasion from soil and other environmental conditions.
Applications
The primary application of high-temperature resistant heat shrinkable sleeves is in the protection of steel pipelines used in various industries, including oil and gas. They are particularly effective for high-profile joints, flanges, and casings, where traditional coatings may fail under extreme conditions. The adhesive layer within the sleeve bonds effectively to both the steel substrate and existing pipeline coatings, ensuring a reliable seal that withstands high temperatures and pressures.
Advantages
Corrosion Resistance: The primary benefit of using heat shrinkable sleeves is their ability to prevent corrosion at welded joints, significantly extending the lifespan of pipelines.
Ease of Installation: These sleeves are straightforward to apply in the field, requiring minimal tools and training. This efficiency reduces labor costs and downtime during installation.
Mechanical Protection: Beyond corrosion resistance, these sleeves provide mechanical protection against impacts and abrasions, making them suitable for harsh environments.
Versatility: High-temperature resistant heat shrinkable sleeves can be used in various applications beyond pipelines, including electrical insulation and sealing for cables.
In conclusion, high-temperature resistant heat shrinkable sleeves play a vital role in ensuring the integrity and longevity of pipeline systems. Their advanced material properties make them an indispensable choice for industries requiring reliable corrosion protection under extreme conditions.
Technical Performance
Property | Test temp. | Unit | Requirement | Test result | Test method |
Thickness | — | mm | ≥ 0.85 × nominal value | 0.88 × nominal value | Annex A
ISO21809-3 |
Holiday detection at 5 kV/mm + 5 kV | — | — | no holiday | no holiday | Annex B
ISO21809-3 |
Impact resistance (holiday detection at 5 kV/mm 5 kV after recovery) | 20℃ | J/mm | ≥ 5 | 6.8 | Annex G
ISO21809-3 |
Indentation resistance (holiday detection at 5 kV/mm 5 kV after recovery)
Residual thickness | 50℃ | N/m㎡ | 1.0 | 1.0 | Annex H
ISO21809-3 |
— | mm | ≥ 0.6 | 1.26 |
Cathodic disbondment at 30 days | 23℃ | mm | ≤ 10.0 | 6.5 | Annex F
ISO21809-3 |
50℃ | mm | ≤15 | 10 |
Peel strength at 10 mm/min to pipe surface primed with epoxy and to plant coating | 23℃ | N/mm | ≥ 2.50 | 8.5 | Annex D
ISO21809-3 |
50℃ | N/mm | ≥ 0.20 | 0.46 |
Peel strength at 10 mm/min
to pipe surface and to plant coating | 23℃ | N/mm | ≥ 0.4 | 8.2 | Annex D
ISO21809-3 |
Peel strength at 10 mm/min
to pipe surface after 28-day
hot-water immersion test at Tmax limited as per Annex I | 23℃ | N/mm | ≥ 0.2 | 7.0 | Annex I
ISO21809-3 |
Peel strength at 10 mm/min
to plant coating after 28-day
hot-water immersion test at Tmax limited as per Annex I | 23℃ | N/mm | ≥ 0.4 | 7.5 | Annex I
ISO21809-3 |
Lap shear strength at 10 mm/min | 23℃ | N/m㎡ | ≥ 0.05 | 3.8 | Annex L
ISO21809-3 |
50℃ | N/m㎡ | ≥ 0.07 | 0.39 |
Thermal ageing resistance (aged at Tmax + 20 °C)
– Elongation at break (E100/E0)
– Peel strength to pipe surface (P100/P100) | 23℃ | E100/E0 | ≥ 0.75 | 0.89 | Annex N
ISO21809-3 |
23℃ | P100/P70 | ≥ 0.80 | 0.92 |
23℃ | A100/A70 | ≥ 0.80 | 0.88 |
Ordering Information |
Select sleeve width that will overlap onto the mill-applied coating by 2 inches( 50mm) minimum on each side of the weld joint. Take a 10% shrinkage during installation of sleeve width into account when calculating the minimum sleeve width. | Range for available dimension: |
Sleeve length | Length of PE shrink sleeves
The length should be calculated as the following formula:
L=π×D×1.07+120mm (when pipe OD ≤42inch) L=π×D×1.07( when pipe OD ＞42inch) |
Sleeve width | We can provide 450mm, 480mm, 500mm, 520mm and 550mm supplied PE shrink sleeves width. |
Sleeve thickness | We can provide 1.8mm, 2.0mm, 2.2mm, 2.5mm, 2.8mm , 3.0mm and 3.2mm supplied PE shrink sleeves thickness. |
Primer thickness | There are two kinds of primer application way, wet film and dry film. We can provide 120um, 150um, 200um, 300um and 400um primer thickness. |
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