Polyurethane insulation pipe market demand is increasing
Release time:
2018-12-07
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China's pipeline market demand is growing and growing fast. The emergence of this situation is mainly caused by the following reasons: 1. China advocates the need for energy conservation and environmental protection policies, such as "central heating", "cogeneration of heat and power" and "triple supply"; 2. The high demand for energy conservation and environmental protection in accelerating the modernization of civilized city construction; 3. In order to improve the quality of life of the people, the country's heating range extends from the serious "three north" areas (I. e. North China, Northeast China, Northwest China) to the "transitional areas" in the vast winter ", cold hot summer. Demand. We have made great progress in research, development, application and so on: in order to meet the rapid development of directly buried steam pipeline, China's vast number of scientific and technological personnel, manufacturers in directly buried steam pipeline technology research, development, application, etc., paid a lot of efforts and made great progress. The diversity of insulation structures and the choice of materials, the scale of engineering practice, no country in the world can compare with us. Companies in Germany, Bruges, Soksam, Italy and the United States have a general diameter of Φ500mm and a small number. At present, the directly buried steam pipelines in Jinan, Shandong, Shijiazhuang, Hebei, Xi 'an, Shaanxi, Dalian, Henan, Jiangsu and Zhejiang provinces in China exceed Φ500mm, and some of them have reached Φ900mm. The insulation structure has an internal sliding and an external sliding. The high-resistance materials selected include microporous calcium silicate, glass wool shell, hot-pressed perlite, silica bead insulation and composite silicate. Insulation structure type, many kinds of insulation materials. Therefore, in the field of development and application of directly buried steam pipelines, China's development diameter is more closely integrated than the development of directly buried insulation pipes from the development of medium steel pipes, polyurethane rigid foam insulation and glass fiber reinforced plastic outer sheath (glass fiber). It has good mechanical strength and excellent corrosion resistance. The first layer: working steel pipe layer, according to the design and customer requirements, generally use seamless pipe (GB8163) spiral welded pipe (GB9711;SY/T5038) and straight seam welded pipe (GB3092). After the surface of steel pipe is treated by advanced shot peening derusting process, the derusting grade of steel pipe reaches Sa2 grade of GB8923 standard, and the surface roughness of GB6060.5 standard can reach R = 12.5 microns. After the surface of the steel pipe is decontaminated and rusted, a layer of anti-corrosion material is applied. The first function is waterproofing, and the other is to improve the bonding surface between the insulation layer and the steel pipe to form a whole. Second layer: a polyurethane insulating layer formed by injecting a rigid polyurethane foam stock solution into a cavity formed between a steel pipe and a special steel mold with a high-pressure foaming machine. This is commonly referred to as the "mold foaming process". Whether the polyurethane foam is full or not, there are quality problems in direct inspection. Its function is to be waterproof, but to keep warm, and the third is to support the weight of the heating network. When the temperature of the conveying medium is − 50 ° C. to 120 ° C., a rigid polyurethane foam is used as the insulating layer, and when the temperature of the conveying medium is − 50 ° C. to 150 ° C., a rigid polyurethane is used. The foam is made of an insulating material. Polyurethane directly buried insulation pipe, also known as "pipe in pipe", is composed of a "two-step method" and is composed of a high-density polyethylene outer protective layer, a polyurethane rigid foam plastic pipe and a steel pipe. The insulation material is rigid polyurethane foam with a density of 60kg/m3 ~ 80kg/m3, which fully fills the gap between the steel pipe and the casing, and has a certain bonding strength, so that the steel pipe and the shell insulation layer are between the three. Form a solid whole. Polyurethane directly buried thermal insulation pipe foam has good mechanical properties and thermal insulation performance. Generally speaking, it can withstand a temperature of 120°C, and can withstand a temperature of 180°C through modification or combination with other insulating materials. An overview of heating and work adapted to urban areas.
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