Construction
Polypropylene heat shrink field joint coatings enjoys very good compatibility with the plant applied three-layer polypropylene coated linepipe.
Structure:
The PP heat shrinkable sleeve is consist of irradiation cross-linked and stretched polypropylene backing and modified high shear strength polypropylene adhesive. It formed into pre-cut wrap around sleeve with a separate closure system, and applied on 2-component solvent-free liquid epoxy primer.
The Backing consists of a cross-linked and stretched polypropylene backing which is designed to partially or fully recover with heat from a touch during application. The backing also provides resistance against mechanical damage and UV resistance during construction and in service.
Specification
| Serial No. |
Specification |
Serial No. |
Specification |
| 1 |
FRDPΦ168×500—1.2/1.0 |
7 |
FRDPΦ508×500—1.5/1.0 |
| 2 |
FRDPΦ219×500—1.2/1.0 |
8 |
FRDPΦ529×500—1.5/1.0 |
| 3 |
FRDPΦ273×500—1.2/1.0 |
9 |
FRDPΦ610×500—1.5/1.0 |
| 4 |
FRDPΦ325×500—1.2/1.0 |
10 |
FRDPΦ711×500—1.5/1.0 |
| 5 |
FRDPΦ355×500—1.2/1.0 |
11 |
FRDPΦ813×500—1.5/1.0 |
| 6 |
FRDPΦ426×500—1.5/1.0 |
12 |
FRDPΦ1220×500—1.5/1.0 |
Note:
☑ Closure patch length and thickness are equal to sleeve axial length and thickness, respectively. Enclosure patch width: 120 mm for sleeves Φ168 ～Φ426 while 150 mm for sleeves > Φ426.
☑ Custom-made is available to meet any customer special demand.
Frequently Asked Questions
What is the maximum operating temperature for polypropylene heat shrinkable sleeves?
The polypropylene heat shrinkable sleeves are designed for pipeline field joints operating at temperatures up to a maximum of 110°C, with a 30-year design life for buried service applications.
Are these sleeves compatible with factory-applied 3LPP coatings?
Yes, polypropylene heat shrink field joint coatings have excellent compatibility with plant-applied three-layer polypropylene (3LPP) coated linepipes, forming the same three-layer structure as factory-applied coatings.
What standards do these heat shrinkable sleeves meet?
The FRDP-PP heat shrinkable sleeves meet and exceed the requirements of ISO/DIS 21809-3: Petroleum and Natural Gas Industries — External Coatings for Buried or Submerged Pipelines used in Pipeline Transportation Systems — Part 3: Field Joint Coatings.
Can custom specifications be manufactured?
Yes, custom-made sleeves are available to meet any customer special demands beyond the standard specifications listed, which range from Φ168mm to Φ1220mm.
What is the structure of the PP heat shrinkable sleeve?
The sleeve consists of irradiation cross-linked and stretched polypropylene backing with modified high shear strength polypropylene adhesive. It is formed into a pre-cut wrap-around sleeve with a separate closure system and applied on 2-component solvent-free liquid epoxy primer.
What are the key performance advantages of these sleeves?
The sleeves offer excellent corrosion resistance, UV protection, mechanical damage resistance, perfect adhesion to epoxy primer and factory coatings, low temperature flexibility down to -40°C, and high temperature performance up to 110°C with superior cathodic disbandment resistance.
CYCT
