PU insulated direct-buried pipe is foamed by chemical reaction using high-performance polyether polyol blend and polymethylene polyphenyl polyisocyanate as raw materials. PU insulated pipe features light bulk density, high strength, thermal insulation, sound insulation, flame retardancy, cold resistance, corrosion resistance, non-absorbency, and simple, rapid construction. It has become an indispensable material for thermal insulation, waterproofing, leak sealing, and sealing in industrial sectors such as construction, transportation, petroleum, chemicals, electric power, and refrigeration. PU insulated pipe is used for insulation and cold-preservation of various indoor and outdoor pipelines, district heating pipelines, central air-conditioning pipelines, and industrial pipelines in chemicals, pharmaceuticals, and similar fields. Since the birth of PU synthetic materials in the 1930s, PU foam insulated pipe has developed rapidly as an excellent thermal insulation material, with an ever-wider range of applications. Because of its simple construction and significant energy-saving and anti-corrosion effects, it is extensively used for various heating, refrigeration, oil-transmission, and steam-transmission pipelines. Jinan Insulated Pipe Let us introduce the advantages of insulated pipe.
1. Convenient construction
The insulation layer—PU foam—is applied over the anti-corrosion coating of the steel pipe by on-site pouring or prefabrication, a simple method with high efficiency.
2. Low thermal conductivity
The thermal conductivity of PU foam is among the lowest of insulation materials, so heat loss of the medium can be reduced to a minimum.
3. Waterproof, anti-corrosive, and aging-resistant
Because the closed-cell ratio of PU foam reaches more than 92%, using PU foam as the insulation layer of a direct-buried pipeline not only provides thermal insulation, but also effectively prevents the penetration of water, moisture, and various other corrosive liquids and gases, and prevents the growth and development of microorganisms.
Performance and Parameters
Technical performance Unit Technical
Density Kg/m3 45-60
Thermal conductivity W/m.k 0.016-0.024
Service temperature ℃ -90-+120
Closed-cell ratio % ≥97
Water absorption Kg/m2 ≤0.2
Oxygen index h ≥26
Compressive strength Mpa ≥200
4. Strong safety and applicability
PU foam can bond firmly with various materials, so when it is used as the insulation layer of a direct-buried pipe, bonding with the anti-corrosion layer is almost never a concern. The service temperature of the PU insulation layer is -196°C to +120°C, and it can reach +190°C for a short time (a dozen hours). If the user requires a long-term temperature of 190°C, we can form it with high-temperature materials according to user needs.
The above content is compiled by Jinan insulated pipe. For more details, please follow us. https://www.sdhpgy.com
