The working principle of thermal pipe insulation mainly utilizes the thermal reflection principle of working steel pipes to reflect heat back to the insulation layer, thereby reducing heat loss. Specifically, the working steel pipe generates a certain amount of heat during the transportation of the medium, which is transmitted to the insulation layer through the surface of the steel pipe. Due to the use of materials with good insulation performance, such as polyurethane, silicate, etc., in the insulation layer, it can effectively reduce heat transfer and achieve the purpose of insulation.
In addition, the outer protective tube of the thermal pipe insulation also has good waterproof and anti-corrosion performance, which can effectively prevent corrosive substances such as water and oxygen from penetrating into the interior of the insulation layer, thereby extending the service life of the entire insulation pipe.
The thermal conductivity of thermal pipe insulation is less than or equal to 0.033W/M.K, which is 4-9 times higher than the insulation effect of other insulation materials. Its water absorption rate is very low, about 0.2kgm2. The reason for low water absorption is that the closed cell rate of polyurethane foam is up to 92%. The low thermal conductivity and low water absorption, combined with the insulation layer and high-density polyethylene or fiberglass protective shell with good waterproof performance on the outside, have changed the traditional "wet cotton jacket" situation of heating pipelines laid in trenches, greatly reducing the overall heat loss of heating pipelines. The heat loss of the heating network is 2%, which is less than the international standard requirement of 10%.
thermal pipe insulation and rubber plastic insulation pipes are commonly used insulation materials, and they have some differences in insulation performance, materials, production processes, and application fields.
1. Thermal insulation performance: polyurethane rigid foam thermal insulation material is used for polyurethane thermal insulation pipe, which has good low thermal conductivity, can effectively reduce heat loss and improve transmission efficiency. The rubber plastic insulation pipe uses rubber plastic cotton insulation material, which has a lower thermal conductivity, but its insulation performance is slightly inferior to that of polyurethane insulation pipe.
2. Material: The inner and outer protective layers of polyurethane insulation pipes are made of plastic material, which has good anti-corrosion performance and can extend the service life of the pipeline. The rubber plastic insulation pipe uses rubber plastic cotton material, which is soft, smooth in appearance, and easy to install and maintain.
3. Production process: Polyurethane insulation pipes adopt pipe in pipe foaming technology, which integrates the insulation pipes into a foam forming process, with high density and mechanical strength. Rubber and plastic insulation pipes are manually wrapped and formed, with relatively low density and mechanical strength.
4. Application field: Polyurethane insulation pipes are suitable for fields such as petroleum, chemical engineering, electricity, urban gas, etc., especially in situations where long-term high temperatures are required. Rubber and plastic insulation pipes are widely used for insulation and insulation in central air conditioning, buildings, ships, vehicles, refrigeration equipment, and other fields, especially in situations where noise reduction and vibration reduction are required.
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