I. Production Line Introduction
Our Polyurethane (PUR) spraying Polyethylene (PE) wrapping pre - insulated pipe production line is dedicated to manufacturing polyurethane prefabricated direct - buried thermal insulating pipes. These pipes find extensive applications in the fields of heating, cooling, and crude oil transportation. As a testament to the strength of "Made in China" in the energy transmission sector, they have become the ideal choice for numerous engineering projects.
II. Product Structure
The rigid polyurethane spraying polyethylene winding prefabricated direct - buried insulation pipe consists of three well - designed layers:
- Working Steel Pipe: Acts as the carrier for conveying the medium, ensuring stable fluid transportation.
- Sprayed Polyurethane Rigid Foam Insulation Layer: Provides efficient thermal insulation for the pipe, reducing heat loss.
- Winding Polyethylene Outer Casing: Protects the internal structure from external environmental corrosion.
III. Scope of Application of the Insulation Pipe
- Application Fields: Anti - corrosion and thermal insulation pipelines in heating, cooling, and crude oil transportation.
- Medium Temperature: ≤120°C (with occasional peak values <140°C), meeting the requirements of various working conditions.
- Medium Pressure: ≤2.5MPa, ensuring the safe operation of the pipeline under high - pressure environments.
- Laying Methods: Primarily suitable for direct burial laying. It can also be used for trench or overhead laying according to actual needs, flexibly adapting to different engineering scenarios.
IV. Advantages of Polyurethane Spray Insulation Pipe
- Uniform and Controllable Density: The density of polyurethane is uniform and can be precisely controlled according to actual requirements, ensuring stable and reliable thermal insulation performance.
- Void - Free Structure: The polyurethane rigid foam has no voids, effectively preventing heat transfer and enhancing the insulation performance.
- High Friction Strength: The surface of the polyurethane foam is rough, with a shear strength (friction) to the polyethylene outer casing greater than 200Kpa, strengthening the overall stability of the pipeline.
- Adjustable Thickness: The thicknesses of both the polyurethane insulation layer and the polyethylene outer casing can be adjusted according to design requirements, meeting the individual needs of different engineering projects.
- Highly Automated Production: The production line has a high degree of automation, resulting in high production efficiency, stable product quality, and reduced labor costs and human errors.
V. Product Specifications
No. |
(DN) |
The thickness of the insulation layer |
Outer casing dia. |
Min. thickness of the outer casing |
| 1 |
500 |
30-60 |
598-658 |
4.5 |
| 2 |
600 |
30-60 |
700-760 |
5.0 |
| 3 |
700 |
30-60 |
790-850 |
5.0 |
| 4 |
800 |
30-60 |
891-951 |
5.5 |
| 5 |
900 |
30-60 |
992-1052 |
6.0 |
| 6 |
1000 |
30-60 |
1093-1153 |
6.5 |
| 7 |
1100 |
30-60 |
1194-1254 |
7.0 |
| 8 |
1200 |
40-100 |
1316-1436 |
8.0 |
| 9 |
1400 |
50-100 |
1538-1678 |
9.0 |
| 10 |
1620 |
50-100 |
1738-1840 |
10.0 |
VI. Technical Process
The spraying and winding production process ensures the uniformity of the density of the insulation layer, significantly improving product quality and reducing production costs.
The PUF spray PE winding pre - insulated pipe production line mainly consists of the following parts:
- Steel Pipe Outer Wall Shot Blasting Line: Cleans the outer wall of the steel pipe, removing impurities and rust to provide a good surface condition for subsequent spraying.
- Polyurethane Spray Molding Line: Precisely controls the amount and uniformity of polyurethane spraying to form a high - quality insulation layer.
- Polyethylene Sheet Extruding Winding Line: Extrudes and winds the polyethylene material onto the insulation layer to form a sturdy outer casing.
- Water Cooling Line: Cools the formed pipe to ensure stable product dimensions.
- End - Cutting Equipment: Precisely cuts the two ends of the pipe to meet installation requirements.
Company Profile
Qingdao Huashida Machinery Co., Ltd was established in 2003. Since its inception, Huashida has focused on plastic polyurethane insulation pipe production line, 3PE anti-corrosion pipe production line, large diameter underground pipe production line and plastic pipe joints for 20 years. We always attach great importance to research and development,
collaborating closely with Beijing University of chemical technology, Qingdao university of technology and scientific research institutions. by absorbing advanced technology home and abroad, after 20 years of endeavor we now rank one of the top 3 manufacturers in the industry in China. Huashida machines have been well received in Saudi Arabia, Kazakhstan, Uzbekistan, United Arab Emirates, Turkey, Russia, etc.
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