Huashida's independently developed patented PUR spray PE wrapping pre-insulated pipe production line uses a continuous polyurethane spray foaming and PE wrapping process to manufacture large-diameter insulated steel pipes (508-1620mm) specifically engineered for industrial pipeline thermal insulation.

This complete patented turnkey PUR spray pre-insulated pipe system integrates three core production sections into one unified solution: external pipe Sa2.5 shot blasting and derusting line, continuous polyurethane spray foaming line, and PE wrap winding production line.

• Industrial Pipeline Thermal Insulation - ≥88% closed-cell PUR foam maintains process fluid temperature and prevents heat loss
• Oil Gas Transmission Pipeline Insulation - stable ≥88% closed-cell PUR spray foam maintains oil viscosity and prevents heat loss
• Chilled Water Distribution Networks - ≤0.05% water absorption rate prevents moisture ingress and insulation degradation
• Chemical Fluid Transport Pipelines - industrial chemical process pipelines requiring stable thermal insulation and corrosion protection
• District Heating and Hot Medium Transport - operating temperature ≤120°C (peak ≤140°C); medium pressure ≤2.5MPa
• Direct Burial, Trench, and Overhead Industrial Pipeline Installation - trinity molding structure provides simultaneous corrosion resistance and thermal insulation

• National Patented Technology - Multiple national utility patents and third-party certified Level 5 technology rating
• ≥88% Closed-Cell PUR Spray Foaming - Continuous PUR spray process delivers high closed-cell ratio and low water absorption (≤0.05%)
• Purpose-Built for Industrial Pipelines - Engineered for oil gas transmission, chilled water distribution, and chemical fluid transport
• 3-4 Units/Hour High Output - Processes large-diameter 508-1620mm industrial pre-insulated pipes efficiently
• Trinity Molding Structure Integrity - One-time synchronous forming eliminates delamination risk

• Steel pipe surface shot blasting and de-rusting (Sa2.5 international cleanliness standard)
• Medium-frequency induction preheating - precision temperature control for optimal polyurethane foam bonding
• Uniform continuous polyurethane spray foaming - achieving ≥88% closed-cell ratio and 30-100mm customizable foaming thickness
• HDPE strip wrapping over PU foam layer - forming the protective PE outer casing
• Finished pipe end trimming and quality inspection - meeting EN253, GB/T29047, and CJ/T114 international standards

1. External Shot Blasting & PU Foaming

2. PU Foaming Curing & PE Film Extrusion

3. Conveyor & Pipe End Repair

Founded in 2003, Qingdao Huashida Machinery Co., Ltd. has over 21 years of professional manufacturing experience in patented PUR spray PE wrapping pre-insulated pipe production lines and industrial pipeline thermal insulation equipment.

We maintain long-term technical cooperation with Beijing University of Chemical Technology, Qingdao University of Technology, and other national research institutions. Huashida Machinery has grown to become one of the top 3 manufacturers in China's pipeline equipment industry.

Our high-quality patented PUR spray pre-insulated pipe manufacturing systems are trusted by global customers and exported to Saudi Arabia, Kazakhstan, Uzbekistan, the UAE, Turkey, Russia, and 60+ countries and regions worldwide.