Heat Shrink Three-Layer Corrosion Protection Sleeve (GTWS)
GTWS is a three-layer, cross-linked polyethylene heat shrink sleeve that protects the weld joint of buried or exposed steel pipeline, Ø159–1016 mm at 500 mm width, with hot-melt adhesive bonded to the pipe's PE coating and cathodic disbondment of 3 rad to ISO 21809-3.
- ASTM D638
- ASTM G14
- ASTM D2240
Dimensional data
Technical Specifications
| Selection Chart | ||||
|---|---|---|---|---|
| Gala Code | Heat Shrink Sleeve | Closure Patch | ||
| Length | Width | Length | Width | |
| GTWS Ø 159 x 500 | 620 | 500 | 100 | 500 |
| GTWS Ø 219 x 500 | 830 | 500 | 100 | 500 |
| GTWS Ø 273 x 500 | 1000 | 500 | 100 | 500 |
| GTWS Ø 325 x 500 | 1200 | 500 | 120 | 500 |
| GTWS Ø 377 x 500 | 1370 | 500 | 120 | 500 |
| GTWS Ø 406 x 500 | 1500 | 500 | 150 | 500 |
| GTWS Ø 426 x 500 | 1560 | 500 | 150 | 500 |
| GTWS Ø 457 x 500 | 1660 | 500 | 150 | 500 |
| GTWS Ø 508 x 500 | 1840 | 500 | 170 | 500 |
| GTWS Ø 529 x 500 | 1900 | 500 | 170 | 500 |
| GTWS Ø 610 x 500 | 2160 | 500 | 170 | 500 |
| GTWS Ø 711 x 500 | 2480 | 500 | 170 | 500 |
| GTWS Ø 720 x 500 | 2500 | 500 | 170 | 500 |
| GTWS Ø 813 x 500 | 2800 | 500 | 170 | 500 |
| GTWS Ø 1016 x 500 | 3430 | 500 | 200 | 500 |
Technical Specification
| Technical Specification | ||
|---|---|---|
| Properties | Value | Standard |
| Sleeve and Closure Patch | ||
| Tensile Strength | 22 N/mm² (Mpa) | ASTM D638 |
| Ultimate Elongation | 550 % | ASTM D638 |
| Impact Resistance | >15J | ASTM G14 |
| Hardness | 50 ±5 Shore D | ASTM D2240 |
| Water absorption | 0.5 % | ASTM D570 |
| Corrosion Protection against | ||
| Chemicals after 24 hrs. | Elongation | ASTM D2671 |
| immersion in 10% HCL, | 100 % | |
| 10% NaOH, 10% NaCl | 97%, 98% | |
| Abrasion Resistance | 30 mg | ASTM D1044 |
| Cathodic Disbondment | 3 rad | ISO 21809-3 |
| Thermal Ageing | (150 °C for 504 hrs) | ASTM D2671 |
| Tensile Strength | 21 N/mm (Mpa) | ASTM D638 |
| Ultimate Elongation | 575 % | ASTM D638 |
| Low Temperature Flexibility (-15 °C for 4 hrs.) | No Cracking | ASTM D2671 |
| Dielectric Strength | 36 MV/m. | ASTM D149 |
| Volume Resistivity | 1 × 10¹³ Ohm.cm | ASTM D257 |
| Hot Melt Adhesive | ||
| Softening Point | 95 °C | ASTM E28 |
| Peel Strength | ASTM D2671 | |
| PE/Steel (25 °C/50 °C) | 100 N/cm / 30 N/cm | |
| PE/FBE(25 °C/50 °C) | 120 N/cm / 35 N/cm | |
| PE/PE(25 °C/50 °C) | 110 N/cm / 30 N/cm | |
GTWS protects the weld joint of buried or exposed steel pipeline and of insulated pipeline, with a sleeve manufactured from cross-linked polyethylene.
Hot-melt adhesive bonds to the steel pipeline surface and its PE coating, forming a continuous anti-corrosive system across the joint. The sleeve resists liquid pressure, bacteria, mildew, pipeline cathodic-protection current and chemical corrosion from liquids and solvents, and prevents the coat separation caused by UV light.
Sizes run Ø159 mm to Ø1016 mm at 500 mm width, sized to pipeline outer diameter, each supplied with a closure patch.
Covered on this page
- Pipeline / Corrosion Protection Products
- Three Layer Corrosion Protection Sleeve
Features & Benefits
- Cathodic disbondment 3 rad (ISO 21809-3)
- Tensile strength 22 N/mm², elongation 550% (ASTM D638)
- Impact resistance >15 J (ASTM G14); hardness 50±5 Shore D (ASTM D2240)
- Abrasion resistance 30 mg (ASTM D1044); water absorption 0.5% (ASTM D570)
- Hot-melt adhesive: softening point 95°C (ASTM E28), peel strength 120 N/cm to FBE at 25°C (ASTM D2671)
- Thermal-aged (150°C for 504 hrs) tensile strength 21 N/mm², elongation 575% (ASTM D2671)
- Low-temperature flexibility: no cracking at -15°C for 4 hrs (ASTM D2671)
- Chemical resistance after 24 hrs immersion: elongation 100% in 10% HCl, 97% and 98% in 10% NaOH and 10% NaCl (ASTM D2671)
- Dielectric strength 36 MV/m (ASTM D149); volume resistivity 1×10¹³ Ω·cm (ASTM D257)
Applications
- Weld joints on buried or exposed steel pipeline
- Joints on insulated pipeline
Standards & Compliance
- ASTM D638
- ASTM G14
- ASTM D2240
- ASTM D570
- ASTM D2671
- ASTM D1044
- ISO 21809-3
- ASTM D149
- ASTM D257
- ASTM E28
FAQs
Frequently Asked Questions
What is the Heat Shrink Three-Layer Corrosion Protection Sleeve used for?
It is used for:
- Weld joints on buried or exposed steel pipeline
- Joints on insulated pipeline
How is it installed?
Clean and degrease the surface, position the part, then shrink it with a gas torch or a hot-air gun: keep the heat moving round it with a smooth, brushing motion so it recovers evenly without scorching. Start at one end and work steadily along to the other.
Which standards and test methods are quoted for it?
These, with the values in the Technical Specification on this page:
- ASTM D638
- ASTM G14
- ASTM D2240
- ASTM D570
- ASTM D2671
- ASTM D1044
- ISO 21809-3
- ASTM D149
- ASTM D257
- ASTM E28
Where can I download the datasheet?
From the "Download datasheet" button at the top of this page, or here:
Can I get a quote, a sample or a size that is not listed?
Send your cable details, quantity and application with the "Request a Quote or Sample" form at the foot of this page. For a size or variant that is not in the chart, describe what you need there, or use Technical support at the top of the page, and the technical team will confirm what can be supplied.
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