Product Details
Detailed description:
|
Product name
|
Directly buried hot water insulated pipe |
carrier pipe |
Steel pipe, stainless steel pipe, plastic pipe, copper pipe |
Casing pipe |
HDPE pipe, galvanized iron sheet, aluminium |
Insulation |
Polyurethane |
Standard |
GB/T29047-2021,EN253 |
Medium temperature |
Less than 120℃(Accidental peak≤130℃) |
Medium pressure |
Less than 2.5 MPa |
Production range |
DN20-DN1600mm |
Production capacity |
2000km/year |
accessory |
Insulation tee, insulation elbow, insulation reducer, insulation fixed bracket, alarm system |
Application |
district heating, district cooling, crude oil transportation and so on |
Laying mode |
underground |
Service |
OEM/ODM |
Parameter of Directly buried hot water insulated pipe：
| Product Indexes |
Reference Standard |
Standard Requirement |
Our product value |
Finished product |
Steel pipe without thermal insulation layer (mm) |
CJ/T114-4.4.1 |
150～250 |
220±30 |
Increasing rate of HDPE outer protection pipe (%) |
CJ/T114-4.4.2 |
≤2 |
1.2 |
Axis eccentricity
(mm) |
CJ/T114-4.4.3 |
see clause 4.4.3 |
qualified |
Expectation of life |
CJ/T114-4.4.4.1 |
120℃30 year |
qualified |
Shear strength (MPa)
(170℃,1450h after aging) |
CJ/T114-4.4.4.2 |
（23±2℃）≥0.12
（140±2℃）≥0.08 |
0.181
0.106 |
Shock resistance |
CJ/T114-4.4.5 |
See clause 4.4.5 |
qualified |
Resistance value between alarm line
(ΜΩ) |
CJ/T114-4.4.6 |
20ΜΩ～∞ |
qualified |
Outer protection pipe |
Density (kg/m3 ) |
CJ/T114-4.2.3.1 |
≥940 |
948.2 |
Elongation at break
% |
CJ/T114-4.2.3.4 |
≥350 |
618 |
Tensile yield strength
(MPa) |
CJ/T114-4.2.3.4 |
≥19 |
20.5 |
Longitudinal shrinkage rate (%) |
CJ/T114-4.2.3.5 |
≤3 |
1.23 |
Long term Mechanical properties |
CJ/T114-4.2.3.6 |
＞1500h（80℃，4.0 MPa）free from damage |
Pass |
The difference of the melt flow rate
(g/10min) |
CJ/T114-4.2.3.2 |
≤0.5 |
0.11 |
Carbon Black Content % |
CJ/T114-4.2.3.1 |
2.5±0.5 |
2.4 |
Polyurethane insulation layer |
Density (kg/m3 ) |
CJ/T114-4.3.2 |
≥60 |
71.1 |
Average pore size
(mm) |
CJ/T114-4.3.1 |
≤0.5 |
qualified |
Percentage of close area
(%) |
CJ/T114-4.3.1 |
≥88 |
94 |
Compressive strength(MPa) |
CJ/T114-4.3.3 |
≥0.3 |
0.58 |
Water absorption
(%) |
CJ/T114-4.3.4 |
Immersion in boiling water 90 minutes , bubble water absorption should be not more than 10% |
≤5.53 |
Coefficient of thermal conductivity before aging
W/(m•K) |
CJ/T114-4.3.5 |
≤0.033 |
0.032 |
Cavity |
CJ/T114-4.3.1 |
≤1/3the thickness of insulation layer |
qualified |
Working steel pipe |
Seamless steel pipe（≤DN150） |
GB8163 |
20# |
qualified |
Spiral steel pipe（≥DN200） |
GB/T9711 or SY/T5037 |
Q235B |
qualified |
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