This pre insulated underground chilled water piping series adopts two mainstream carrier pipe solutions: PE-RT II composite plastic pipe and carbon steel pipe, covering DN20-DN1600 full specification range. The rigid polyurethane foam insulation layer forms seamless filling between working pipe and outer jacket, effectively preventing cold bridge and condensate dripping during long-term chilled water transportation. Multiple outer sheath options including HDPE winding casing, FRP fiberglass shell and metal galvanized steel casing are available to adapt dry, saline and acid underground soil environments. The product complies with GB/T40402, GB/T29047 and international industry standards, stable for long-term chilled medium below 85℃ with working pressure ≤1.0MPa. Complete supporting insulated fittings (45°/90° elbow, equal/reducing tee, reducer, end cap) and field joint insulation kits are supplied, supporting straight pipe and coiled pipe customized lengths. It can be laid directly underground, in trenches or integrated pipe gallery, widely used in shopping malls, office buildings, industrial parks and municipal district cooling projects.
Product Technology
· Raw Material Inspection: All steel pipe, PE-RT tube, polyurethane raw materials and HDPE particles pass strict composition and performance testing before production.
· Surface Pretreatment: Steel pipes go through shot blasting rust removal & FBE anti-corrosion coating; plastic pipes adopt precise extrusion with wall thickness closed-loop control.
· Integrated Forming: Two mature production lines: One-step integral extrusion & spray winding process. Polyether polyol and isocyanate are automatically proportioned for high-density foaming, uniform insulation thickness without voids.
· Outer Shell Molding: HDPE extrusion winding / FRP winding / metal plate wrapping according to customer requirements, online cooling and dimension inspection.
· Pipe End Trimming & Marking: Cut and clean pipe ends, print specification, batch, standard code for full traceability.
· Finished Product Testing: Conduct thermal conductivity, compression, water absorption and pressure resistance test before warehousing.
Product Details
· Carrier Pipe: PE-RT II plastic / carbon steel optional, stable pressure resistance, low fluid resistance, no scaling inside pipe.
· PU Insulation Layer: Closed-cell rigid foam, low thermal conductivity, anti-condensation, customized thickness 26~150mm.
· Optional Leak Detection Copper Wire: Embedded between insulation and outer jacket, real-time pipeline leakage monitoring.
· Outer Protective Jacket: HDPE / FRP / galvanized steel, anti-pressure, waterproof, anti-soil chemical corrosion.
· Matching Fittings: Complete insulated pipe fittings with gradual wall design to avoid stress concentration, electrofusion welding compatible.
· Field Joint Accessories: PE joint sleeves, heat shrink tapes, foaming materials, complete joint sealing construction solution.
Company Strength
· Factory Scale: Established Jan 1995, registered capital 190 million RMB, two production bases in Tangshan & Jingzhou, total plant area 310,000 ㎡.
· Official Honors: National Single Champion Manufacturer, National Specialized & Sophisticated Little Giant Enterprise, National Green Design Demonstration Enterprise, member of Heating Standardization Committee of Ministry of Housing and Urban-Rural Development.
· Industry Status: Director unit of China Urban Heating Association & China Building Energy Conservation Association, vice president unit of China Plastics Processing Industry Association.
· R&D Strength: 140+ national patents, 20+ software copyrights, participated in drafting over 70 national & industrial standards; 5 provincial-level R&D platforms including Hebei Insulation Pipe Technology Research Institute.
· Production Capacity: 30+ automatic insulation pipe production lines, annual output of anti-corrosion & insulated pipes exceeds 3,000 km, 5 major series over 300 customizable pipe products.
· Quality Control: 2,000 ㎡ professional testing center with full set pipeline performance equipment, implement three-level inspection system for all products.
· Global Project Experience: Professional on-site service team for every project, one-to-one full-cycle service; supplied pipes to over 1,700 projects across 200+ cities on four continents, total supply length over 30,000 km.
FAQ
Q: What working medium temperature can pre insulated underground chilled water piping bear?
A: If adopting PE-RT II plastic working pipe, long-term stable working temperature ≤85℃, max working pressure 1.0MPa; steel type can operate under long-term 120℃ with peak temp up to 140℃, pressure reach 2.5MPa, customers can select according to cooling system parameters.
Q: Can we customize insulation thickness and pipe length?
A: Yes. PU insulation thickness range 26~150mm adjustable; straight pipe standard length DN≤63 is 4m, DN≥63 is 6m, coiled pipes with customized length 80~360m are available on demand.
Q: What ground conditions fit HDPE outer sheath pipe?
A: HDPE outer pre insulated underground chilled water piping suits ordinary neutral underground soil with low corrosion. For saline, acid or swamp soil, we recommend FRP fiberglass outer jacket version for longer service life.
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