Product Introduction:
Factory Fabricated Insulated cross tee weld OEM Specialised Pipe And Fittings
Cross tee,insulated specialisted pipe and fittings; factory fabricated specialised pipe and fittings;OEM specialised pipe and fittings
Advantage and characteristics:
1.project cost can be reduced by 25%.
2.reduce heat loss, energy saving, heat preservation effect increased by 4 ~ 9 times and the water absorption rate is very low, about 0.2kg / m2.
3.anti-corrosion, good insulation performance, long service life: raw material HDPE, with high mechanical strength and good corrosion resistance,effectively prevent the infiltration of water and oil, service life is up to 50 years, three or four times more than the traditional outer protection tube.
Main Indexs of Pre-insulated Pipe |
Product Name | Product Indexes | Reference Standard | Unit | Standard Requirement |
| 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 |
| 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 |
| Seamless steel pipe(≤DN150) | GB8163 | 20# | Up to standards |
Spiral steel pipe (≥DN200) | GB/T9711 or SY/T5037 | Q235B | Up to standards |

