Products Description
|
Main Indexs of Pre-insulated Pipe
|
||||
|
Product Name
|
Product Indexes
|
Reference Standard
|
Unit
|
Standard Requirement
|
|
Finished product
|
Steel pipe without thermal insulation layer
|
CJ/T114-4.4.1
|
mm
|
150-250
|
|
Increasing rate of HDPE outer protection pipe
|
CJ/T114-4.4.2
|
%
|
≤ 2
|
|
|
Axis eccentricity
|
CJ/T114-4.4.3
|
mm
|
see clause 4.4.3
|
|
|
Expectation of life
|
CJ/T114-4.4.4.1
|
year
|
120℃ 30 years
|
|
|
Shear strength(170℃，1450h after aging)
|
CJ/T114-4.4.4.2
|
MPa
|
(23±2℃）>0.12
(140±2℃) >0.08 |
|
|
Shock resistance
|
CJ/T114-4.4.5
|
3kg/2m
|
see clause 4.4.5
|
|
|
Resistance value between alarm line
|
CJ/T114-4.4.6
|
MΩ
|
more than 20MΩ
|
|
|
Outer protection pipe |
Density
|
CJ/T114-4.2.3.1
|
kg/m3
|
≥940
|
|
Elongation at break
|
CJ/T114-4.2.3.4
|
%
|
≥350
|
|
|
Tensile yield stength
|
CJ/T114-4.2.3.4
|
MPa
|
≥19
|
|
|
Longitudinal shrinkage rate
|
CJ/T114-4.2.3.5
|
%
|
≤3
|
|
|
Long term Mechanical properties
|
CJ/T114-4.2.3.6
|
80℃ 4.0MPa
|
>1500h free from damage
|
|
|
The difference of the melt flow rate
|
CJ/T114-4.2.3.2
|
g/10min
|
≤0.5
|
|
|
Carbon Black content
|
CJ/T114-4.2.3.1
|
%
|
2.5±0.5
|
|
|
Polyurethane insulation layer |
Density
|
CJ/T114-4.3.2
|
kg/m3
|
≥60
|
|
Average pore size
|
CJ/T114-4.3.1
|
mm
|
≤0.5
|
|
|
Percentage of close area
|
CJ/T114-4.3.1
|
%
|
≥88
|
|
|
Compressive strength
|
CJ/T114-4.3.3
|
MPa
|
≥0.3
|
|
|
Water absorption
|
CJ/T114-4.3.4
|
%
|
Immersion in boiling water 90 minutes, bubble water absorption should be not more than 10%
|
|
|
Coefficient of thermal conductivity before aging
|
CJ/T114-4.3.5
|
w/(m.k)
|
≤0.033
|
|
|
Cavity
|
CJ/T114-4.3.1
|
≤1/3 the thickness of insulation layer
|
||
|
Working steel pipe
|
Seamless steel pipe(≤DN150)
|
GB8163
|
20#, X42,X52,X60,X70
|
Up to standards
|
|
Spiral steel pipe (≥DN200)
|
GB/T9711 or SY/T5037
|
Q235B,Q355B,X42,X52,X60,X70
|
Up to standards
|
|
English 
