**Advantages of Polyurethane Insulation Materials?**
Dacheng Xiangdong Insulation Refractory Material Factory
Phone: 13473696600 | 15731614448
Polyurethane foam insulation pipe is a modern, multifunctional material that combines waterproofing, thermal insulation, and heat preservation properties. It has become widely used in various industries such as urban central heating systems, warm rooms, cold storage facilities, coal mines, oil pipeline ports, chemical plants, natural gas pipelines, direct burial power lines, air conditioning piping, cable conduits, and steam insulation pipes.
Due to its excellent performance, ease of installation, and long service life, polyurethane insulation pipes are increasingly popular in projects related to the petroleum industry, chemical engineering, urban heating networks, and municipal construction. However, proper installation and construction precautions must be followed to ensure optimal performance and longevity.
Here are some key construction considerations for polyurethane insulation pipes:
1. **Groove Preparation**: The trench should be flattened, with a dry bottom and a fine sand cushion of approximately 200mm thickness. The sides and top of the insulation pipe should be covered with at least 200mm of fine sand. This prevents damage from hard objects and allows the sand to fill gaps around the pipe, ensuring sufficient friction.
2. **Preheating for Direct Burial**: For one-time compensation direct burial pipelines, preheating according to design specifications is essential. The temperature must be maintained at the design level during preheating, and the one-time compensator must be completed before cooling after welding or backfilling.
3. **Hydraulic Pressure Test**: After installation, a hydraulic pressure test at 1.5 times the working pressure is required. Once the test is passed, interface foaming treatment should be carried out. This includes cleaning the surface of the steel pipe joint, removing oil, impurities, and protective layers from the ends, and ensuring the ambient temperature is above 10°C during foaming.
The structural mechanism of polyurethane foam insulation pipes consists of several key layers:
1. **Anti-Corrosion Layer**: Protects the outer steel pipe from corrosion, extending its lifespan.
2. **Outer Protective Steel Pipe**: Shields the insulation layer from groundwater erosion, supports the working pipe, and withstands external loads.
3. **Polyurethane Foam Layer**: Ensures the medium's temperature remains stable and keeps the outer protective tube at a normal temperature.
4. **Working Steel Pipe**: Facilitates the smooth flow of the transported medium.
5. **Barrier and Reflective Layer**: Prevents organic foam from entering the inorganic high-temperature resistant layer and reflects part of the heat.
6. **Inorganic Hard Insulation Layer**: Provides high-temperature resistance, ensures a stable interface with the organic insulation layer, and prevents carbonization.
7. **Friction Reduction Layer**: Allows free thermal expansion and contraction of the working steel pipe.
For more information about the advantages and features of polyurethane insulation materials, feel free to contact Dacheng Xiangdong Insulation Refractory Material Factory.
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