Automatic PUR Spray Pre-Insulated Pipe Making Machine for Buried Pipelines with

Huashida's independently developed automatic PUR spray pre-insulated pipe making machine is a complete pre-insulated pipe production line for manufacturing large-diameter insulated steel pipes (508–1620 mm). Using a continuous polyurethane spray foaming and PE wrapping process, it produces direct buried pipes 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, making it suitable for export projects that require internationally recognized pre-insulated pipe specifications.

As a turnkey insulated pipe production line, it brings every stage into one vendor-unified pipe machine line: an external pipe Sa2.5 shot blasting and derusting line, medium-frequency induction preheating, a continuous PUR spray foaming machine, a PE wrap winding line, and a pipe end trimming machine — all managed by a PLC electrical control system. Buyers do not need to source, integrate, or coordinate separate equipment for pipeline insulation equipment projects of any scale.

This polyurethane foam 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 machine are used for:

• Direct Buried 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 spray foam 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.

• PLC Controlled Pipe Making Machine: Shot blasting, spray foaming, PE wrapping, and trimming run as one turnkey system, reducing integration risk for insulation plants.
• High Quality PUR Foam: Continuous spray foaming delivers ≥88% closed-cell ratio and ≤0.05% water absorption for stable insulation in buried heating and chilled water pipelines.
• Large Diameter 508–1620 mm: Produces insulated steel pipes at 3–4 units per hour, with 30–100 mm customizable foam thickness for heating, cooling, and oil gas pipeline projects.
• EN253 Standard Pipes: Output meets EN253, GB/T29047, and CJ/T114, with steel pipe, PU foam, and HDPE casing structure, suitable for export pipeline insulation projects worldwide.
• Patented Technology, 12-Month Warranty: Multiple national utility patents and Level 5 technology rating, backed by all-life after-sales service, operator training, and 60–80 day delivery.

1. Steel pipe surface shot blasting and de-rusting (Sa2.5 international cleanliness standard) — ensuring optimal PUR foam adhesion on the pipe production line.
2. Medium-frequency induction preheating — precision temperature control for reliable polyurethane foam bonding across the 508–1620 mm diameter range.
3. Uniform continuous polyurethane spray foaming across the full pipe surface — achieving ≥88% closed-cell ratio and 30–100 mm customizable foaming thickness.
4. HDPE strip wrapping over the PU foam layer — forming the protective PE outer casing of the trinity molding structure.
5. 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, pipe making 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 machine lines are exported to Saudi Arabia, Kazakhstan, Uzbekistan, the UAE, Turkey, Russia, and 60+ countries and regions worldwide.