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System Description

High Temperatures 2-Layer (2LPE) Heat-Shrinkable Wrap-around Sleeve is superior performance heat shrinkable products designed for corrosion protection on field applied girth-weld joints of buried and exposed steel pipelines operating up to 65°C

The inner layer is two-components epoxy primer which coated on steel pipe，Intermediate level is special hot melt adhesive;Outer layer is modified radiation crossing linking polyethylene backing.

High Temperatures 2-Layer (2LPE) Heat-Shrinkable Wrap-around Sleeve is developed by this Company on the basis of the original product. It is the first of the same kind in China. Currently, the product is well above the domestic anticorrosive professional standards and reaches the standard requirement of ISO21809-3.

High Temperatures 2-Layer (2LPE) Heat-Shrinkable Wrap-around Sleeve product uses the polyethylene produced by ATOFINA of France and many other auxiliary materials as base materials. The mechanic performance targets such as indentation resistance, impact resistance and tensile strength have reached ISO21809-3 standards.

Heat shrink wrap Sleeves provide great corrosion protection, Superior resistance to Cathodic Disbandment and excellent durability against abrasion and chemical attack. The result is effective, good performance of sealing, wide application, easy to operate and preheating temperature,,long term protection against corrosion.

Executive Standard

ISO21809-3:2016

Petroleum and natural gas industries — External coatings for buried or submerged pipelines used in pipeline transportation systems — Part 3: Field joint coatings

Selection Range

Thickness: 2.0mm、2.2mm、2.3mm、2.5mm、2.6mm、2.7mm、2.8mm、3.0mm、

Width: 450mm、500mm、550mm

Length: L=π×D×1.07 +120(mm), D≤700mm. L=π×D×1.07 (mm), D＞700mm

Technical Index Property

Test Standard

Heat-Shrinkable Wrap-around Sleeve

FJC 14A-2 65℃

Holiday detection at 5 kV/ mm + 5 kV

ISO21809-3 Annex C

no holiday

Indentation resistance: Pressure Tmax=65°C, N/mm2

Residual thickness, mm

Amount of penetration, mm

ISO21809-3 Annex E

10.0

0.7

-

Peel strength at 10 mm/min to pipe surface and to polyolefin plant coating

at 23 °C, N/mm

Tmax=65°C, N/mm

ISO21809-3 Annex H

1.3

0.3

Lap shear strength a, 10mm/ min

at 23 °C, N/mm2

Tmax=65°Cx, N/mm2

ISO21809-3 Annex J

0.3

0.09

—Elongation at break E100/ E70), at 23 °C

—Peel strength to pipe sur-face (P100/P70), at 23 °C

ISO21809-3 Annex M

0.86

Installation Instructions

I. Construction tools: flame spray gun, pressure roller, wire brush, rag, etc.

II. Installation steps:

1. Sandblasting and cleaning the joint part: draw the joint installation part at the joint, and remove the water and soil at the joint installation part.

2. Preheating and sanding: preheat the pipe wall at the joint installation position to about 70 ℃ and sanding along the circumference.

3. The HSS shall be used to cover the pipe, the two ends of the pipe to be connected shall be aligned horizontally, and the gap between the two sections shall be kept as small as possible. When the gap is greater than 15mm, the end face of the pipe shall be treated to minimize the gap.

4. Heat evenly along the circumference from the middle, make it shrink completely, and then extend to both ends for heating. When heating, the allowable heating temperature of the heat shrinkable zone shall not exceed 250 ℃, and pay attention to uniform use of fire. After all shrinkage, reheat the uneven surface to make it completely flat. After the whole heating, turn down the flame and reheat again to make the hot melt adhesive overflow fully.

5. During the heating process, the joint is rolled several times with the pressure roller, and the fusion lap joint is mainly rolled to eliminate bubbles.

III. Installation quality judgment:

1. The heat shrinkable belt shrinks evenly along the circumference, and the surface is smooth without wrinkles, bubbles, voids, scorching and cracking.

2. The adhesive layer at the edge of the heat shrinkable zone is fully melted and evenly overflowed.

IV. Note:

1. When the connected pipe needs to be moved, it should be moved after the joint is cooled to below 50 ℃, and the position with less stress at the joint should be kept as far as possible.

2. The heat shrinkable tape after installation shall be covered to avoid direct sunlight. When the temperature of the joint is too high, the cooling measures (such as watering, etc.) should be taken.