PE-RT II type thermal pipe for central heating / hot spring use
Category: Heating pipe
Description
Product Introduction
PE-RTII type heat-resistant polyethylene heating pipe, as a new type of insulated composite plastic pipe, has the characteristics of corrosion resistance and long service life.
The PE-RTII type heat-resistant polyethylene heating pipe adopts a hot melt connection method, which is convenient for construction, corrosion-resistant, and has a long service life. The PE-RTII type heating pipe consists of three parts: the outer layer is HD-PE high-density polyethylene pipe, the middle layer is polyurethane foam insulation layer, and the inner layer is the working pipe PE-RTII type. The static liquid pressure test of the PE-RTII type heat-resistant polyethylene heating pipe (insulated composite plastic pipe) at 110°C has exceeded 16,000 hours. According to the national standard 'Determination of Long-term Static Liquid Pressure Strength of Thermoplastic Plastic Materials in Pipe Form by Extrapolation Method' (GB/T18252-2008), when 30°C < AT < 35°C, the extrapolation time factor ke is 30, which indicates that the extrapolated limit for the application of insulated composite plastic pipes at 80°C has exceeded 50 years.
Due to the fact that plastic materials are poor conductors of heat, the thermal conductivity coefficient of the inner pipe of the PE-RTII type heat-resistant polyethylene heating pipe (insulated composite plastic pipe) is only 1% of that of steel pipes. This means that the pipeline itself has certain insulation properties. Additionally, the expansion coefficients of the PE-RII type pipe, insulation layer, and outer protective pipe are basically the same, allowing the three layers to form an organic whole that is not prone to delamination issues. Therefore, the insulation effect of this pipeline is superior to that of steel pipes, achieving a temperature drop of less than 0.1°C per kilometer.
Product Features
1. Reduces project costs. According to relevant departments' calculations, dual-pipe heating pipelines can generally reduce the thermal conductivity coefficient of Type I heating pipes to: λ = 0.013-0.03 kcal/m·h·°C, which is much lower than other commonly used insulation materials in the past, improving insulation effectiveness by 4 to 9 times. Additionally, its water absorption rate is very low, about 0.2 kg/m.
2. The low water absorption rate is due to the closed-cell rate of polyurethane foam being as high as about 92%. The combination of low thermal conductivity and low water absorption rate, along with a good waterproof performance from the high-density polyethylene protective shell on the outside, changes the traditional situation where heating pipes laid in trenches are like 'wearing a wet cotton coat', significantly reducing overall thermal loss in heating pipelines. The thermal loss in heat networks is only 2%, which is less than the national standard requirement of 10%.
3. Corrosion-resistant with good insulation performance and long service life. The PE-RTII type heating pipe has a polyurethane rigid foam insulation layer that tightly bonds to its PE-RII type outer skin, isolating it from air and water infiltration and providing good corrosion resistance. At the same time, its foam cells are all closed with very low water absorption. The high-density polyethylene shell has excellent corrosion resistance, insulation, and mechanical properties. Therefore, it is difficult for external air and water to erode the outer skin of working PE-RTII type heating pipes. According to foreign data, the service life of PE-RTII type heating pipes can reach over 50 years, which is 3 to 4 times longer than traditional trench or overhead installations.
4. Occupies less land area and allows for faster construction, benefiting environmental protection. The PE-RTII type heating pipe does not require building large trenches; it only needs to be buried underground with insulation management personnel involved. This greatly reduces project land occupation and excavation volume by about more than 50%, while reducing civil construction and concrete volume by up to 90%. At the same time, processing of insulated pipes can be done in parallel with on-site trench digging; only on-site joints are needed, which can shorten construction time by more than 50%.
5. Safety. The PE-RTII type heating pipe not only possesses advanced technology and practical performance that traditional trench and overhead installation pipelines cannot compare with but also has significant social and economic benefits; it is also a powerful measure for energy-saving in heating systems. The adoption of PE-RTII type direct-buried heating pipeline technology marks a new starting point in China's heating pipeline technology development. With further improvement and development of this advanced technology, it is inevitable that direct-buried PE-RTII type heating pipes will replace trench and overhead installations.
| Specifications for PE-RTII Type Thermal Pipes for Central Heating/Spa Use (Unit: mm) | |||
| PE-RT II Pipe | PE-RT II Insulation Layer | ||
| S5 Series | S4 Series | Specifications | Insulation Thickness (mm) |
| -- | 20x2.3 | -- | -- |
| 25x2.3 | 25x2.8 | -- | -- |
| 32x2.9 | 32x3.6 | -- | -- |
| 40x3.7 | 40x4.5 | -- | -- |
| 50x4.6 | 50x5.6 | 50/90 | 18.0 |
| 63x5.8 | 63x7.1 | 63/110 | 22.0 |
| 75x6.8 | -- | 75/125 | 22.0 |
| 90 x 8.2 | -- | 90/140 | 22.00 |
| 110x10.0 | -- | 110/160 | 23.0 |
| 125x11.4 | -- | 125/180 | 25.0 |
| 160x14.6 | -- | 160/125 | 29.0 |
| 200x18.2 | -- | 200/280 | 36.0 |
| 250x22.7 | -- | 250/355 | 48.00 |
| 315x28.6 | -- | 315/400 | 37.00 |
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PE-RT II type thermal pipe for central heating / hot spring use
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GOODY TECHNOLOGY CO., LTD
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