Product Details
Tianjin High Density Polyurethane Insulation Coating Hdpe Outer
Jacket Steel Pipe
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 |
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 |
Company Profile
Hebei Zexu Pipeline Manufacturing Co., Ltd. has a complete
production and operation management system and is one of the first
companies in the industry to pass the ISO9001 quality management
system certification, HSE environment, and occupational health and
safety management system certification. The company has three
manufacturing branches for steel pipes, pipe fittings, and boiler
vessels, and has functional departments such as marketing
department, technology department, purchasing department,
production department, inspection department, quality assurance
department, and comprehensive department. It has established a
complete and complete set of quality, Safety, production and
management procedures.
After years of development, Hebei Zexu Pipeline Manufacturing Co.,
Ltd. has a nationwide business network and radiates to the United
States, India, Pakistan, Russia, the Middle East and other
countries and regions.
Hebei Zexu Pipe Manufacturing Co., Ltd. has always adhered to the
business philosophy of honesty, innovation and cooperation to
promote development, customer satisfaction and trust as the
foundation, sustainable development as the goal, relying on
scientific management to improve quality, reduce costs, and create
brands. For many consecutive years, it has been awarded as
"Advanced Unit for Safety Production Standardization Construction",
"Hebei Province Industrial Cluster Leading Enterprise", "AAA Credit
Enterprise", "Hebei Province Metal Products Industry Leading
Enterprise", "Hebei Province Key Employment Service Enterprise",
"Star Enterprise", "Top 50 Industrial Enterprises in Cangzhou
City", "Famous Trademark of Hebei Province", "Contract-abiding and
Promise-keeping Unit", "Recommended Supplier of Main Auxiliary
Equipment for Thermal Power Units" and other honorary titles.

