EN253 PUR Spray PE Wrap Pre-Insulated Pipe Production Line for Buried Pipelines with Shot Blasting

Huashida's independently developed EN253 PUR spray pre-insulated pipe production line uses a continuous polyurethane spray foaming and PE wrapping process to manufacture large-diameter insulated steel pipes (508–1620 mm) for direct buried pipelines, including district heating, chilled water distribution, and oil and gas thermal insulation networks. Built around the EN253 construction standard, the line produces factory-prefabricated pipes that also meet GB/T29047 and CJ/T114, making it a practical choice for export projects that require internationally recognized pre-insulated pipe specifications.

As a complete turnkey PUR spray pre-insulated pipe system, this line integrates every production stage into one matched, vendor-unified solution: an external pipe Sa2.5 shot blasting and derusting line, medium-frequency induction preheating, a continuous polyurethane spray foaming line, a PE wrap winding production 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 buried pipeline insulation projects of any scale.

This advanced direct buried pre-insulated pipe manufacturing system ensures excellent polyurethane foam insulation quality, a high closed-cell ratio (≥ 88%), a low water absorption rate (≤ 0.05%), and a stable trinity molding structure (steel carrier pipe → PU foam insulation layer → HDPE PE outer casing). The 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 honor of Shandong Province First Set of Technical Equipment.

Pipes produced on this EN253 PUR spray pre-insulated pipe production line are used for:

• Direct Buried District Heating Networks — ≥ 88% closed-cell PUR foam minimizes heat loss across long-distance buried heating pipelines, improving energy efficiency for municipal networks.
• Chilled Water and District Cooling Pipelines — ≤ 0.05% water absorption rate prevents moisture ingress and insulation degradation where condensation risk is persistent.
• Oil and 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 provides corrosion resistance, mechanical protection, and thermal insulation in one pipe.

• EN253 Standard Compliance: Produces pre-insulated pipes meeting EN253, GB/T29047, and CJ/T114 standards, ready for international direct buried district heating and industrial pipeline projects.
• Sa2.5 Shot Blasting Included: Integrated external wall derusting gives clean carrier steel pipe surfaces, improving polyurethane foam adhesion and long-term bonding strength in buried service.
• ≥ 88% Closed-Cell PUR Foam: Continuous spray foaming keeps water absorption at ≤ 0.05%, protecting insulation performance across 30–100 mm customizable foam thickness for buried pipelines.
• 508–1620 mm Large Diameter Range: Handles big carrier steel pipes at 3–4 units per hour, keeping heating, cooling, and oil and gas pipeline projects on schedule.
• PLC Controlled Turnkey Line: Shot blasting, induction preheating, PUR spray foaming, PE wrapping, and end trimming come as one matched system with 12-month warranty.

1. Steel pipe surface shot blasting and de-rusting (Sa2.5 international cleanliness standard) — ensuring optimal PUR foam adhesion to the carrier pipe.
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 EN253 PUR spray pre-insulated pipe production lines, district heating pipeline equipment, oil and 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 and gas pipeline insulation. Our systems are exported to Saudi Arabia, Kazakhstan, Uzbekistan, the UAE, Turkey, Russia, and 60+ countries and regions worldwide.