Huashida's independently developed turnkey pre-insulated pipe production line uses a continuous PUR spray and PE wrapping process to manufacture large-diameter insulated steel pipes (508-1620mm) for district heating, chilled water distribution, and oil & gas pipeline networks.

This complete turnkey polyurethane foam pipe insulation system integrates three core production sections into one matched line: external pipe shot blasting and derusting, polyurethane spray foaming, and PE wrap winding production - eliminating the need to source, integrate, or coordinate separate vendor equipment.

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

• District heating and chilled water distribution networks - primary application for large-diameter 508-1620mm pre-insulated pipe systems in municipal infrastructure
• Oil and crude oil pipeline thermal insulation - stable polyurethane foam insulation maintains fluid viscosity and prevents heat loss
• Municipal and industrial hot/cold medium transport (operating temperature ≤120°C, peak ≤140°C; medium pressure ≤2.5MPa)
• Direct burial, trench, and overhead pipeline installation - trinity molding structure provides corrosion resistance and mechanical protection

• Fully Turnkey Pre-Insulated Pipe System: One matched, integrated production line engineered to run together from day one, reducing commissioning time and integration risk
• Continuous PUR Spray Foaming Process: Delivers high closed-cell ratio (≥88%) and low water absorption rate, ensuring stable long-term thermal conductivity
• National Patented, Third-Party Verified Technology: Backed by multiple national utility patents and certified Level 5 technology rating
• 3-4 Units/Hour High Output: Processes large-diameter pre-insulated steel pipes significantly faster than standard single-station foaming lines
• Trinity Molding Structure Integrity: One-time synchronous forming ensures dimensional consistency and eliminates delamination risk

• Steel pipe surface shot blasting and de-rusting (Sa2.5 international cleanliness standard)
• Medium-frequency induction preheating for optimal PUR foam adhesion
• Uniform continuous polyurethane spray foaming across the full pipe surface
• HDPE strip wrapping over PU foam layer - forming the protective PE outer casing
• Finished pipe end trimming and quality inspection

Founded in 2003, Qingdao Huashida Machinery Co., Ltd. has over 20 years of professional manufacturing experience in turnkey pre-insulated pipe production lines, PUR spray PE wrap insulated pipe equipment, polyurethane foam pipe insulation systems, 3PE anti-corrosion pipe production lines, and plastic pipe fitting production machinery.

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 with a proven track record across municipal district heating, oil & gas, and industrial pipeline infrastructure projects worldwide.

Our high-quality 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.