PUR Spray PE Wrapping Pre-Insulated Pipe Line for District Water Cooling Heating

Huashida's independently developed BV Audited continuous 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) for district heating networks, chilled water distribution, and oil gas pipeline thermal insulation.

As the only listing in this pre-insulated pipe production line family independently verified by Bureau Veritas (BV) factory audit (ID: MIC-ASR2551964) - the strictest international third-party supplier verification standard - alongside multiple national utility patents and a third-party certified Level 5 technology rating, this line delivers independently verified technical and manufacturing credentials that most competing pre-insulated pipe production lines at this price point cannot claim.

As a complete BV Audited turnkey PUR spray pre-insulated pipe system, this line integrates three core production sections into one matched, vendor-unified solution: an external pipe Sa2.5 shot blasting and derusting line, a continuous polyurethane spray foaming line, and a PE wrap winding production line - eliminating the need to source, integrate, or coordinate separate equipment for district heating and industrial pipeline thermal insulation projects of any scale.

This advanced continuous PUR spray district heating pre-insulated pipe manufacturing system ensures excellent polyurethane foam insulation quality, 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) - the internationally recognized EN253 construction standard for factory-prefabricated direct-burial district heating pre-insulated pipe systems.

The eco-friendly, low-carbon insulated pipes feature stable long-term thermal performance, outstanding pressure resistance up to 2.5MPa, and significant economic value for large-scale district heating pipeline infrastructure projects worldwide.

• District Heating Networks - the primary application; ≥88% closed-cell PUR foam maintains hot water temperature and minimizes heat loss across long-distance buried district heating pipeline infrastructure
• Chilled Water Distribution Networks - ≤0.05% water absorption rate prevents moisture ingress and insulation degradation in district cooling and chilled water pipeline systems
• Oil Gas Transmission Pipeline Thermal Insulation - stable high closed-cell PUR spray foam maintains oil viscosity and reduces heat loss over long-distance buried oil gas transmission pipelines
• District Heating and Hot Medium Transport - operating temperature ≤120°C (peak ≤140°C); medium pressure ≤2.5MPa; suitable for municipal district heating networks and industrial hot medium pipeline systems
• Direct Burial, Trench, and Overhead Pipeline Installation - the trinity molding structure (steel + PU foam + HDPE PE casing) provides simultaneous corrosion resistance, mechanical protection, and thermal insulation

• BV Audited Manufacturing Facility: Bureau Veritas independently audited Huashida's factory capabilities, manufacturing processes, and quality management systems (ID: MIC-ASR2551964)
• Continuous PUR Spray Foaming - ≥88% Closed-Cell: Continuous PUR spray process delivers high closed-cell ratio, low water absorption (≤0.05%), and stable long-term thermal conductivity
• National Patented & Level 5 Technology Certified: Multiple national utility patents, third-party Level 5 technology rating, and Shandong Province First Set of Technical Equipment honor
• 3-4 Units/Hour High Output: Processes large-diameter 508-1620mm district heating pre-insulated pipes faster than standard single-station foaming lines
• Fully Turnkey District Heating System: Shot blasting, continuous PUR spray foaming, and PE wrapping in one matched line - no separate vendors, no integration risk

• Steel pipe surface shot blasting and de-rusting (Sa2.5 international cleanliness standard)
• Medium-frequency induction preheating for optimal PUR foam bonding across 508-1620mm diameter range
• 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 of the trinity molding structure
• Finished pipe end trimming - meeting EN253, GB/T29047, and CJ/T114 international district heating 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 continuous PUR spray PE wrapping pre-insulated pipe production lines, 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. By integrating advanced global technologies and international standards, Huashida Machinery ranks among China's top 3 pipeline equipment manufacturers - with a proven track record across district heating networks, oil gas transmission, chilled water distribution, and industrial pipeline thermal insulation infrastructure projects in Saudi Arabia, Kazakhstan, Uzbekistan, the UAE, Turkey, Russia, and 60+ countries worldwide.