EMAIL:
wr@insulatedpipeline.com
wyy@insulatedpipeline.com
Update time：2025-04-12
High-density polyurethane foam steel pipe insulation has become a mature advanced technology in foreign developed countries.
In recent years, China's heating engineers and technicians through the study of this technology, promoting the domestic pipe laying technology to a higher level of development.
High-density polyurethane foam steel pipe insulation construction is simple, energy-saving anti-corrosion, light weight, high strength, thermal insulation, flame retardant, cold resistance, corrosion, non-absorbent and other characteristics.
Core implementation standards
(1) National standards
GB/T 29047-2021: Provide for the structure of prefabricated direct buried thermal insulation pipe, technical requirements, test methods and GB/T 29047-2021: specifies the structure of prefabricated buried thermal insulation pipe, technical requirements, test methods and inspection rules, covering the core indexes such as density of polyurethane foam, closure rate and compressive strength.
GB/T 29046-2012:urban heating prefabricated buried thermal insulation pipe technical indicators of testing methods standard.
(2) Industry standard
SY/T 115-2001: Technical specification for polyurethane insulation pipe with high-density polyethylene sheath in petroleum industry.
Key Performance Parameters
(1) Polyurethane foam layer
Density: ≥60 kg/m³ (minimum requirement of national standard), conventional range 60-80 kg/m³; Closed cell ratio: ≥88% (to ensure waterproof);
Thermal conductivity: ≤0.033 W/(m-K) (at 50℃);
Compressive strength: radial compression Strength ≥ 0.3 MPa (10% deformation condition);
Temperature range: long-term operation -50℃ to +120℃, short-time can withstand +190℃.
(2) Steel pipe and protective layer
Steel pipe material: 20# carbon steel, Q235-B, etc seamless steel pipe GB/T 8163, spiral welded pipe SY/T 5037; Outer protection layer: high-density polyethylene (HDPE), density ≥ 950 kg/m³, carbon black content 2.5% ± 0.5% (UV resistance);
anti-corrosion requirements: steel pipe surface shot blasting rust removal to Sa2 level, roughness R = 12.5 microns.
Other technical indicators
Axial shear strength: ≥0.12 MPa (23℃);
Water absorption: ≤10% (100℃ boiling water immersion for 90 minutes);
Service life: design life of 30-50 years (thermal insulation and outer sheath);
Pipe diameter specifications: DN20-DN1200, support customized length (such as 6m, 12m, 24m, etc.).
Applications
High-density polyurethane foam steel pipe insulation is widely used in the following fields:
Centralized heating pipe network: used for conveying hot water or steam, to ensure that the loss of heat in the process of transmission is minimized.
Petrochemical pipeline: suitable for the transportation of oil, natural gas and other chemical media.
Municipal engineering: used for urban water supply and drainage, fire-fighting pipelines, etc.
Industrial pipeline: such as chemical, pharmaceutical and other industries in the high or low temperature medium transportation.
Storage method
1. The ground should be level and free from hard impurities such as gravel.
2. Placement site should be dug drainage ditch, the site should not accumulate water.
3. The stacking site should be set up with pipe supports, and the outer protection pipe should be 150mm above the ground.
4. The stacking height of the insulation pipe should not be more than 2 meters.
5. Insulation pipe shall not be subject to sunlight, rain and soaking, open storage is appropriate to cover with a tarpaulin, stacking should be away from heat and fire sources.
Structure
The first layer of working steel pipe: seamless pipe, spiral welded pipe, straight seam welded pipe, ppr and glass fiber reinforced plastic pipe can be used.
The second layer of polyurethane insulation layer: with low and high pressure foaming machine in the sandwich between the steel pipe and the outer shell, a one-time injection of rigid polyurethane foam raw materials and become.
The third layer of high-density polyethylene plastic pipe: its role is to protect the polyurethane insulation layer from the destruction of mechanical hard objects, and the second is anti-corrosion, waterproof.
High-density polyurethane foam steel pipe insulation specification model sheet
|
Working Steel Pipe OD (mm) |
Pipe wall thickness (mm) |
Sheath OD (mm) |
Outer protection tube Wall thickness
(mm) |
Polyurethane insulation thickness (mm) |
|
25 |
2.5 |
60 |
2.5 |
15 |
|
32 |
2.5 |
90 |
2.5 |
26.5 |
|
45 |
3.0 |
130 |
3.0 |
39.5 |
|
57 |
3.5 |
120 |
3.0 |
28.5 |
|
60 |
3.5 |
160 |
3.0 |
27.0 |
|
76 |
4.0 |
160 |
3.0 |
39.0 |
|
89 |
4.0 |
180 |
3.2 |
42.5 |
|
108 |
4.0 |
180 |
3.5 |
33.0 |
|
133 |
4.5 |
225 |
3.5 |
42.5 |
|
140 |
4.5 |
250 |
3.9 |
41.6 |
|
159 |
4.5 |
250 |
3.9 |
49.1 |
|
219 |
6.0 |
315 |
4.9 |
43.1 |
|
273 |
6.0 |
365 |
5.6 |
40.4 |
|
325 |
7.0 |
420 |
7.0 |
40.5 |
|
377 |
7.0 |
500 |
7.8 |
53.7 |
|
426 |
7.0 |
560 |
8.8 |
58.2 |
|
478 |
8.0 |
600 |
8.8 |
52.2 |
|
529 |
8.0 |
655 |
9.8 |
53.2 |
|
630 |
8.0 |
760 |
11.5 |
53.5 |
|
720 |
8.0 |
850 |
12.0 |
53.0 |
|
820 |
10.0 |
960 |
14.0 |
56.0 |
|
920 |
10.0 |
1055 |
14.0 |
53.5 |
|
1020 |
14.0 |
1220 |
14.0 |
86.0 |
|
1220 |
14.0 |
1380 |
15.0 |
65.0 |
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E-mail：wr@insulatedpipeline.com
E-mail：wyy@insulatedpipeline.com
Address：Chengnan Development Zone, Yanshan County, Cangzhou City, Hebei Province, China
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