Cangzhou Hengtai Zeyuan Anti-corrosion Pipeline Co., Ltd.
Detailed Introduction of Lined Plastic Steel Pipe
1. Product Overview
Lined plastic steel pipes are composite pipes that combine the high strength of steel pipes with the corrosion resistance of plastic materials. They are suitable for transporting corrosive media such as acids, alkalis, salts, and high-purity liquids. These pipes are widely used in industries such as petroleum, chemical engineering, power plants, metallurgy, and municipal water supply and drainage.
2. Product Structure
A lined plastic steel pipe consists of an outer steel pipe, an inner plastic lining, and a special adhesive layer:
- Outer Steel Pipe: Typically made from seamless steel pipes, spiral welded pipes, or straight welded pipes to provide high mechanical strength.
- Inner Lining: Made from polyethylene (PE), cross-linked polyethylene (PEX), polyvinyl chloride (PVC), polypropylene (PP), or polytetrafluoroethylene (PTFE) to ensure excellent corrosion resistance.
- Adhesive Layer: Special bonding technology, such as hot melt adhesive, ensures the firm adhesion of the plastic lining to the steel pipe, preventing delamination.
3. Main Standards
- Steel Pipe Standards: GB/T 8163 (Fluid Transmission Steel Pipe), GB/T 3091 (Low-Pressure Welded Steel Pipe), GB/T 9711 (Petroleum and Natural Gas Steel Pipe)
- Plastic Lining Standards: GB/T 13663 (Water Supply Polyethylene Pipe), GB/T 18742 (Hot and Cold Water Polypropylene Pipe)
- Composite Pipe Standards: CJ/T 136 (Water Supply Lined Plastic Steel Pipe), SY/T 6623 (Plastic-Lined Composite Steel Pipe for Oil and Gas)
- Connection Standards: GB/T 23257 (Adhesion Testing for Anti-Corrosion Layers), HG/T 20538 (Chemical Pipeline Design Specification)
4. Product Specifications
1. Common Sizes (Customizable)
- Nominal Diameter (DN): 15mm (1/2”) ~ 2000mm (80”)
- Wall Thickness (mm): 2.5mm ~ 30mm
- Length (m): 6m, 9m, 12m, or customized
2. Steel Pipe Material Options
- Seamless Steel Pipe: 20#, Q235B, Q345B, 304/316L Stainless Steel
- Welded Steel Pipe: Q235B, Q345B, L245, L360, etc.
3. Inner Lining Material and Application Scope
| Lining Material | Applicable Temperature (℃) | Corrosion Resistance | Application Field |
|---|---|---|---|
| PE (Polyethylene) | -40 ~ 60 | Acid, Alkali, Low-Temperature Resistant | Water Supply, Food Transportation |
| PP (Polypropylene) | -20 ~ 90 | Strong Corrosion Resistance | Chemical, Pharmaceutical, Pure Water Systems |
| PVC (Polyvinyl Chloride) | -10 ~ 60 | Aging Resistant, Corrosion Resistant | Municipal, Industrial Wastewater |
| PEX (Cross-Linked Polyethylene) | -30 ~ 95 | High-Temperature and Corrosion Resistant | Hot Water, Heating Pipelines |
| PTFE (Polytetrafluoroethylene) | -100 ~ 260 | Excellent Corrosion Resistance | Chemical, Semiconductor, Pharmaceutical |
5. Product Features
- Excellent Corrosion Resistance: Suitable for acid, alkali, and salt media, extending service life.
- High Strength: The outer steel layer provides mechanical support, allowing high pressure and impact resistance.
- Low Fluid Resistance: Smooth inner surface prevents scaling and reduces energy consumption.
- Hygienic and Safe: Complies with food-grade and potable water requirements, free from harmful substances.
- Easy Installation: Multiple connection methods, including flange, thread, and welding.
6. Connection Methods
- Flange Connection: Suitable for large-diameter pipes, easy to dismantle and maintain.
- Threaded Connection: Suitable for small-diameter pipes, easy to install.
- Welded Connection: Ideal for high-pressure and high-temperature environments, ensuring better sealing.
- Quick Coupling: Used in specific applications for easy disassembly.
7. Application Fields
- Municipal Engineering: Drinking water supply, wastewater treatment pipelines.
- Chemical Industry: Transportation of strong acids, alkalis, and corrosive gases or liquids.
- Oil and Gas Industry: Oilfield injection water, chemical reagent pipelines.
- Power Plants: Cooling water pipelines, desulfurization systems.
- Food and Pharmaceutical Industry: Pure water and food-grade liquid transportation.
8. Customization and Technical Support
- Customization Available: Size, material, pressure rating, color, and length can be customized.
- Accessories Provided: Flanges, elbows, tees, valves, and other pipeline fittings.
- Technical Support: Installation guidance, welding training, and maintenance manuals.
9. Quality Inspection and Certification
- Testing Items: Pressure testing, corrosion resistance testing, impact strength testing, adhesion testing, etc.
- Certifications: ISO 9001 Quality Management System, GB/T 17219 (Drinking Water Safety Certification), API (Petroleum Pipeline Certification).
10. Usage and Maintenance Guidelines
- Avoid prolonged exposure to sunlight to prevent degradation of the plastic lining.
- Operate within the rated pressure limits to prevent damage.
- Regularly inspect connection points to prevent leaks.
- Ensure compatibility of the plastic lining with the transported chemical medium.
11. Conclusion
Lined plastic steel pipes combine the advantages of steel and plastic pipes, offering corrosion resistance, high strength, long service life, and easy installation. Depending on the working conditions, different lining materials and connection methods can be selected to ensure optimal performance.
For special requirements, please contact Hebei Hengtai Zeyuan Anti-Corrosion Pipeline Co., Ltd., where we provide professional customization solutions and technical support.
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Keywords
Lined plastic pipe，Steel-plastic straight pipe, anti-corrosion pipe
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Hebei Hengtai Group, 338 National Road North, Zhenggang Industrial Park, Yanshan County, Cangzhou City, Hebei Province
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