Pre Insulated Pipe
Thermal insulation direct buried pipe can also be called pre insulated pipe, they are a kind of heat pipeline. We can supply high quality Heating Pipeline, welcome to choose us!
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Product Indexes
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Reference Standard
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Standard Requirement
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Our product value
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Outer protection pipe
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Density (kg/m3 )
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CJ/T114-4.2.3.1
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≥940
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948.2
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Elongation at break (%)
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CJ/T114-4.2.3.4
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≥350
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618
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Tensile yield strength (MPa)
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CJ/T114-4.2.3.4
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≥19
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20.5
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Longitudinal shrinkage rate (%)
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CJ/T114-4.2.3.5
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≤3
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1.23
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Long term Mechanical properties
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CJ/T114-4.2.3.6
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>1500h(80℃,4.0 MPa)free from damage
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Pass
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The difference of the melt flow rate (g/10min)
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CJ/T114-4.2.3.2
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≤0.5
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0.11
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Carbon Black Content %
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CJ/T114-4.2.3.1
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2.5±0.5
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2.4
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Polyurethane insulation layer
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Density (kg/m³)
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CJ/T114-4.3.2
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≥60
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71.1
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Average pore size (mm)
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CJ/T114-4.3.1
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≤0.5
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qualified
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Percentage of close area(%)
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CJ/T114-4.3.1
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≥88
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94
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Compressive strength(MPa)
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CJ/T114-4.3.3
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≥0.3
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0.58
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Water absorption(%)
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CJ/T114-4.3.4
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Immersion in boiling water 90 minutes, bubble water absorption should be not more than 10%
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≤5.53
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Working steel pipe
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Seamless steel pipe(≤DN150)
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GB8163
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20#
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qualified
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Spiral steel pipe(≥DN200)
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GB/T9711 or SY/T5037
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Q235B
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qualified
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PRODUCT FEATURES
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Product name
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Thermal insulation direct buried pipe
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Length
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5.8m-12m, or by customer's requirements
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Nominal diameter
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DN25-1800
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Laid way
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Buried
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Application
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Fluid Pipe, Natural gas, Gas, Oil, Hydraulic, chemical, drill, etc.
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Production Standard
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The national standard GB/T29047-2012, CJ/T114-2000, CJ/T155-2001
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