roducts 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 | ||||
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 | Up to standar | ||
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