Coated Plastic Steel Pipes and Lined Plastic Steel Pipes are our company’s core main products, widely applied in construction, fire protection, water supply and drainage, and many other fields. However, there are significant differences between the two in production processes, performance and applicable scenarios, which often cause confusion among purchasers. Combined with professional product parameters, this article clearly breaks down their core differences in a table to help domestic and overseas customers make accurate model selection and avoid procurement risks.
| Comparison Dimension | Coated Plastic Steel Pipe | Lined Plastic Steel Pipe |
| Process Principle | With steel pipe as the base material, plastic anti-corrosion layers (PE/EP) are fusion-bonded to the inner and outer surfaces through spraying, rolling, dipping and suction processes. | With steel pipe as the base material, a plastic lining (PE/PP) is mechanically attached to the inner wall of the steel pipe, with no outer coating. |
| Anti-corrosion Performance | Dual internal and external anti-corrosion, excellent corrosion and aging resistance, capable of resisting erosion from various acid and alkaline media, suitable for harsh and complex environments. | Only inner wall anti-corrosion; the outer wall requires additional anti-corrosion treatment, ideal for scenarios with non-strongly corrosive media. |
| Connection Methods | Supports threaded, grooved, flange, welding and other connection methods, compatible with all pipe diameters for convenient construction. | Mainly connected by threading and flanging; welding may easily damage the inner lining, resulting in multiple construction limitations. |
| Applicable Scenarios | Fire protection systems, chemical medium transportation, buried water supply and drainage, mine ventilation and other complex working conditions. | Civil water supply and drainage, food-grade fluid transportation, ordinary industrial medium transportation (non-strongly corrosive). |
| Executive Standard | CJ/T 120-2016 Plastic-Coated Composite Steel Pipes for Water Supply | GB/T 28897-2022 Steel-Plastic Composite Pipes |
Shandong Baoju Reminder:
During model selection, it is necessary to take into account the service environment, medium type and construction requirements. Priority shall be given to products compliant with international standards to ensure long-term and stable operation. Our company can provide customized selection solutions and sample testing services based on customers’ specific demands.