Qiannan cold and hot water Thermal insulation pipe advantage
Insulation pipe is also called prefabricated insulation pipe fitting It is a kind of directly buried prefabricated insulation pipe with good thermal insulation performance, safety and reliability, and low project cost. It effectively solves the problems of heat preservation, sliding lubrication and * * * pipe end waterproofing of prefabricated insulation pipe fittings for medium high temperature heat transmission in urban central heating. Thermal insulation pipe fittings not only have traditional trench and overhead laying The Conduit The incomparable advanced technology and practical performance, as well as significant social and economic benefits, are also powerful measures for heat supply and energy conservation. The thermal insulation pipe fittings adopt the directly buried heating pipe technology, marking that the development of China's heating pipe technology has entered a new starting point.
The company has earlier introduced foreign * * * technology and equipment, and has 15 extruders production line High speed production of super large polymer with diameter from 70 (mm) to 1668 (mm) ethylene Jacket pipe, whose product quality has reached or exceeded the national standard and has been approved for testing, has more than 200 specifications and models, and is delivered in time. The high-quality insulation pipe is closely combined by the steel pipe conveying the medium, the polyurethane rigid foam plastic insulation layer and the glass fiber reinforced plastic outer protective layer (glass fiber reinforced plastic). It has good mechanical strength and excellent corrosion resistance. Front layer: working steel pipe layer. Seamless pipe (GB8163), spiral welded pipe (GB9711; SY/T5038) and straight welded pipe (GB3092) are generally selected according to the design and customer requirements. After the steel pipe surface is treated by advanced shot blasting, the steel pipe rust removal grade can reach Sa2 in GB8923 - standard, and the surface roughness can reach R=12.5 μ m in GB6060.5 standard. After decontamination and rust removal, the steel pipe surface shall be coated with a layer of anti-corrosion material, which can be used for waterproofing and improving the bonding surface between the insulation layer and the steel pipe to form a whole.
The second layer: polyurethane insulation layer, which is made by injecting the original liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the special steel mold with a high-pressure foaming machine. It is commonly known as "mold foaming process". Whether polyurethane foam is full or not, any quality problem is convenient for direct inspection. Its role is to waterproof, but insulation, and to support the weight of the heating network. When the temperature of the transmission medium is - 50 ℃ - 120 ℃, hard plastic is selected as the insulation layer; when the temperature of the transmission medium is - 50 ℃ - 150 ℃, hard plastic is selected as the insulation layer.
The third layer: FRP protective layer is made by mechanical wet winding. Its function is to protect the polyurethane insulation layer from mechanical hard objects, and to prevent corrosion and waterproof. It has good weather resistance, acid resistance and seawater resistance. However, the resin must be 306 #, 191 #, 189 #, 196 # and other rigid and semi-rigid unsaturated resins. Glass fiber and cloth must be made of medium and low alkali fiber yarn drawn by platinum tongs or tank furnaces. It is prohibited to use fiber yarn with high alkali content drawn by soil pots to ensure product quality.
Product features:
1. It has good physical properties and is stronger than steel, cast iron and plastic. The expansion coefficient of glass fiber reinforced plastic pipe is about the same as that of steel, and the thermal conductivity is only 0.5% of that of steel. It is a good thermal and electrical insulator.
2. Good corrosion resistance, long service life, up to 30 years.
3. Low thermal conductivity, 0.028W/mK, good thermal insulation performance, water temperature drop less than 0.5 ℃/km.
Application field:
When the temperature of conveying medium is: - 50
The thermal insulation and cold insulation engineering of various mediums within the range of ℃ - 150 ℃ is widely used in the thermal insulation and cold insulation engineering of collective heating, geothermal development, coal mine, petroleum, port, chemical industry and other industries in cities and towns. As the weather resistance of glass fiber reinforced plastic shell is better than that of high-density polyethylene, it is especially suitable for directly buried and overhead alternately laid pipe networks and heat networks laid in coastal areas. It is mainly used in water conservancy, sewage, petroleum, chemical industry, electric power, metallurgy, medicine and other fields. It has the advantages of light weight, high mechanical strength, strong corrosion resistance, convenient installation and maintenance. The product has been successfully applied throughout the country.
