This polyurethane insulated pipe is a factory-prefabricated assembly consisting of a steel carrier pipe, a rigid polyurethane foam insulation layer, and an HDPE outer casing, all tightly bonded together. Widely used in municipal district heating, district cooling, and industrial pipeline insulation, Xingbang manufactures a full range of sizes from DN20 to DN1600mm, with an annual production capacity exceeding 3,000 kilometers.
Three Layer Structure
|
Structural Layer |
Material |
Function |
|
Working Steel Pipe |
Seamless steel pipe or spiral welded pipe |
Transports hot water and other media, withstands system pressure |
|
Insulation Layer |
Rigid polyurethane foam |
Thermal insulation, reduces heat loss |
|
Outer Casing |
High-density polyethylene (HDPE) |
Waterproof, anti-corrosion, impact-resistant, withstands external loads |
Product Advantages
High Insulation Efficiency
The rigid polyurethane foam has a thermal conductivity of ≤0.033 W/(m·K) and a closed-cell ratio of ≥88%, resulting in minimal heat loss and effectively reducing energy consumption and operating costs for heating systems.
01
Excellent Waterproofing and Corrosion Resistance
The fully sealed HDPE outer casing, combined with the high-closed-cell-ratio polyurethane insulation, effectively isolates the pipe from groundwater and soil corrosion, offering a design service life of over 30 years.
02
Convenient Installation
Factory-prefabricated pipe sections allow for direct-burial installation without the need for masonry trenches, shortening the construction period by more than 50%.
03
High Compressive Strength
The polyurethane insulation layer typically offers a compressive strength exceeding 150 kPa, enabling it to withstand external pressures during transportation and installation.
04
Optional Leakage Monitoring
Alarm wires can be embedded within the insulation layer to monitor for pipeline leaks in real-time, ensuring the safe and stable operation of the piping network.
05
Manufacturing Process
Xingbang polyurethane insulated pipe primarily utilize the "pipe-in-pipe" manufacturing process. Key steps include:
Shot blasting for rust removal, achieving an Sa2.5 grade finish.
Fitting the HDPE outer casing over the carrier steel pipe.
Injecting a mixture of polyether polyol and isocyanate at a specific ratio into the annular space between the carrier pipe and the outer casing; the materials mix via high-pressure impingement and expand to fill the void.
The foam cures to form the insulation layer.
Comprehensive testing of properties such as density, thermal conductivity, and closed-cell content.
Xingbang employs German PUROMAT high-pressure foaming units; the foaming process features constant temperature control to ensure raw material stability and superior foam quality.
Product Applications
District heating
Transporting hot water from district heating stations to end-users such as residential complexes, commercial buildings, hospitals, and industrial facilities.
District cooling
Transporting chilled water for commercial complexes, hospitals, industrial parks, airports, and other large-scale district cooling systems.
Industrial process systems
Transporting hot or cold media between various process units and production facilities.
Oil and gas
Piping systems requiring specific temperature maintenance and thermal insulation during media transport.
Energy and utilities
District thermal energy transport and other long-distance insulated piping systems requiring temperature control.
Customization Services
Pipe diameter specifications
Full range customization from DN20 to DN1600 mm; optimal pipe diameters are selected based on project flow rates and operating conditions.
Insulation layer thickness
Optimal thickness is determined via thermal calculations based on medium temperature, pipe diameter, burial depth, and soil thermal resistance. Standard thickness ranges from 20 to 80 mm, with options for increased thickness for special operating conditions.
Carrier steel pipe
Options include seamless steel pipe or spiral welded pipe; steel grades can be customized according to standards such as GB/T 9711 and API 5L, with wall thickness determined by operating pressure requirements.
Outer Casing Material
HDPE outer casing: Suitable for direct-buried installation; standard colors are black or yellow.
Metal outer casing: Galvanized sheet metal, color-coated steel, or stainless steel; suitable for above-ground (overhead) installation.
Leakage Monitoring System
Can be equipped with pre-installed alarm wires (impedance-based) or fiber-optic monitoring systems to enable precise leak location. Alarm wire models (imported or domestic) can be selected based on project requirements.
Pipe Length
Standard lengths are 6m, 9m, and 12m; non-standard lengths can be customized based on transportation conditions and on-site installation requirements.
Customization for Special Operating Conditions
High water table areas: Thickened HDPE outer casing for enhanced waterproofing and sealing.
Corrosive soil: FBE anti-corrosion coating applied to the steel carrier pipe.
Extremely cold regions: Thickened insulation layer and optimized insulation structure.
Customization Process
Customer submits operating parameters
Xingbang provides technical proposal and quotation
Technical agreement signed after mutual confirmation
Production scheduling
Factory inspection
Logistics and delivery
Production Capacity
Established in 1995, Xingbang has long focused on the R&D and production of anti-corrosion, thermal insulation, and prefabricated insulated pipe products.
The company's production base covers approximately 310,000 square meters, featuring 28 production lines for prefabricated insulated pipes and over 200 sets of production and testing equipment. The annual production capacity for polyurethane insulated pipe and related products exceeds 3,000 kilometers.
Extensive production experience enables the company to supply insulated pipes across a wide range of diameters, structures, and engineering specifications, supporting bulk orders and continuous supply for large-scale pipeline network projects.
Currently, the company's products are used in over 200 cities, with a cumulative application length of approximately 9,000 kilometers across projects on four continents.
After sales and Technical Support
On-site service: Dedicated service teams assigned to each project, with technical personnel on standby 24/7 to respond to on-site needs.
Joint sealing: Professional installation teams and on-site joint sealing technology; high-pressure mechanical foaming ensures joint quality; on-site guidance or full joint sealing execution services available.
Construction support: Equipped with specialized on-site construction vehicles integrating power generation, sandblasting, and foaming functions to flexibly handle site conditions.
Technical Training: We provide complimentary technical consultation, training, and documentation to help customers enhance their independent operation and maintenance capabilities.
Maintenance & Spare Parts: We offer equipment maintenance, overhauls, upgrades, and system spare parts services, as well as support for remote equipment status monitoring.
Warranty & Traceability: Backed by an accredited after-sales management system and over 10 service centers nationwide, our digital platform enables one-click quality traceability.
Global Delivery: With our own transport fleet and professional delivery team, we ensure timely delivery even during challenging periods; for overseas projects, we provide installation guidance and customized after-sales support.
FAQ
Q: What is the applicable temperature range for polyurethane insulated pipe?
A: They are suitable for operating conditions where the conveyed medium temperature does not exceed 120°C (with occasional peaks up to 130°C) and the working pressure does not exceed 2.5 MPa.
Q: What is the designed service life?
A: Under normal operating conditions and proper installation, the designed service life is over 30 years. With good maintenance, the service life can exceed 50 years.
Q: What is the production capacity for Xingbang polyurethane insulated pipe?
A: Xingbang operates eight polyurethane insulation pipe production lines and one "one-step" production line, with an annual output of 3,000 kilometers of prefabricated direct-buried polyurethane insulated pipes (sizes DN20–DN1600).
Q: Is customization available for overseas projects?
A: Yes. Xingbang products have been exported to countries such as Mongolia, Chile, Vietnam, and the Congo. We can customize production to meet the standards of the destination country and provide third-party inspection services from agencies like SGS, BV, and TUV.
Q: What types of media are these products suitable for?
A: They are suitable for hot water, cold water, and other fluids requiring temperature-controlled transport. Specific materials and structural designs are determined based on the medium's properties, temperature, pressure, and operating conditions.
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