Production Technology Flow of Polyurethane Coating Steel Pre-insulated Pipe Equipment:
The standardized production process of the polyurethane (PU) coating steel pre-insulated pipe equipment (for industrial/oil-gas/water pipeline projects) follows 5 core steps, ensuring high-quality insulation performance and efficient continuous production:
1. Steel Pipe Surface Shot Blasting Derusting: Remove rust, oxide scale and impurities from the steel pipe surface thoroughly (matches the external shot blasting system of the production line), ensuring the surface cleanliness meets the requirements for PU foam adhesion—critical for insulation durability.
2. Steel Pipe Preheating: Preheat the derusted steel pipe to the optimal temperature (customizable based on pipe specification), laying a solid foundation for uniform polyurethane (PU) spraying and improving foam bonding strength.
3. Uniform PU Foam Spraying: Spray polyurethane (PU) foam evenly on the outer surface of the preheated steel pipe using professional PU foam spraying equipment, ensuring consistent foam thickness, high closed-cell rate, and low water absorption.
4. HDPE Strap Winding: Wrap melted high-density polyethylene (HDPE) strap tightly around the cured PU foam layer, forming a protective outer layer that is corrosion-resistant, wear-resistant, and waterproof—key for long-term pipeline service.
5. Pipe Ends Trimming: Trim the two ends of the finished pre-insulated pipe precisely, ensuring flatness and standard size, which facilitates subsequent pipe connection and installation in actual engineering projects
Main line Composition of the polyurethane coating steel preinsulated pipe equipment:
| No. |
Name |
| 1 |
External wall shot blasting rust removal machine |
| 2 |
Medium-frequency induction heating furnace |
| 3 |
Polyurethane spray foaming unit |
| 4 |
Pipe rotator trolley |
| 5 |
Single screw extruder and diehead mould |
| 6 |
Finished pipe ends trimming machine |
| 7 |
Pipe Conveyers and racks |
| 8 |
Electrical system and PLC |
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