PUR Foaming PE Wrapping Pre-Insulated Pipe Line for Heating Pipelines with PLC

Huashida's PUR foaming and PE wrapping pre-insulated pipe production line is a complete pipe insulation machine system for manufacturing large-diameter insulated steel pipes (508–1620 mm). A continuous polyurethane foaming machine applies uniform foam onto the rotating steel pipe, and a PE wrapping machine then winds an HDPE outer casing over it. The result is factory-prefabricated direct buried pipe for district heating pipe networks, chilled water distribution, and oil & gas pipeline insulation. The line follows the EN253 construction standard and also meets GB/T29047 and CJ/T114.

As a turnkey heating pipe production line, it joins every stage in one vendor-unified system: Sa2.5 shot blasting and derusting, medium-frequency induction preheating, continuous PUR foaming, PE strip wrapping, and pipe end trimming, all managed by a PLC electrical control system. Buyers get one matched insulated pipe making machine line instead of sourcing and integrating separate equipment.

This spray foam insulation machine system delivers a high closed-cell ratio (≥88%), low water absorption rate (≤0.05%), and a stable trinity molding structure (steel carrier pipe → PU foam insulation layer → HDPE PE outer casing). Pipes withstand operating temperatures up to 120 °C (peak 140 °C) and medium pressure up to 2.5 MPa. The line is supported by multiple national utility patents, a third-party certified Level 5 technology rating, and the Shandong Province First Set of Technical Equipment honor.

Pipes produced on this pre-insulated pipe production line are used for:

• District Heating Pipe Networks — ≥88% closed-cell PUR foam minimizes heat loss across long-distance buried heating pipelines and improves municipal energy efficiency.
• Chilled Water and District Cooling Pipelines — ≤0.05% water absorption rate prevents moisture ingress and insulation degradation where condensation risk is persistent.
• Oil & Gas Pipeline Thermal Insulation — stable closed-cell PUR foam insulation maintains medium temperature and reduces heat loss in long-distance buried transmission lines.
• Industrial Hot Medium Pipelines — suitable for operating temperature ≤120 °C (peak ≤140 °C) and medium pressure ≤2.5 MPa.
• Direct Burial, Trench, and Overhead Installation — the trinity molding structure gives corrosion resistance, mechanical protection, and thermal insulation in one pipe.

• PUR Foaming Precision: Continuous spray foaming forms foam with ≥88% closed-cell ratio and ≤0.05% water absorption, cutting heat loss in buried heating and cooling pipelines.
• Tough PE Wrapping: HDPE strip winding forms a protective outer casing over the foam, giving corrosion resistance and mechanical protection for direct buried pipelines.
• High Output Production: Processes 508–1620 mm steel pipes at 3–4 units per hour with 30–100 mm customizable foam thickness, matching large heating, cooling, and oil & gas projects.
• Complete Turnkey Line: Shot blasting, induction heating, PUR foaming, PE wrapping, and end trimming come under one PLC control system from a single supplier.
• Proven Technology and Support: National utility patents, EN253 compliant pipes, 12-month warranty, and all-life after-sales service back every line shipped to over 60 countries worldwide.

• Steel pipe surface shot blasting and de-rusting (Sa2.5 international cleanliness standard) — ensuring strong PUR foam adhesion to the carrier pipe.
• Medium-frequency induction preheating — precise temperature control for reliable polyurethane foam bonding across the 508–1620 mm diameter range.
• Continuous PUR foaming across the full pipe surface — achieving ≥88% closed-cell ratio and 30–100 mm customizable foam thickness.
• HDPE strip wrapping over the PU foam layer — forming the protective PE outer casing of the trinity molding structure.
• Finished pipe end trimming and quality inspection — meeting EN253, GB/T29047, and CJ/T114 pre-insulated pipe standards.

Founded in 2003, Qingdao Huashida Machinery Co., Ltd. — Bureau Veritas (BV) Audited Supplier (ID: MIC-ASR2551964) — has over 21 years of professional manufacturing experience in pre-insulated pipe production lines, PUR foaming machines, PE wrapping machines, district heating pipeline equipment, oil & gas pipeline thermal insulation systems, 3PE anti-corrosion pipe production lines, and large-diameter underground pipeline equipment.

We maintain long-term technical cooperation with Beijing University of Chemical Technology, Qingdao University of Technology, and other national research institutions. Huashida Machinery ranks among China's top 3 pipeline equipment manufacturers, with project experience in direct buried district heating, chilled water distribution, and oil & gas pipeline insulation. Our pipe insulation machine lines are exported to Saudi Arabia, Kazakhstan, Uzbekistan, the UAE, Turkey, Russia, and 60+ countries and regions worldwide.