production polyurethane Direct burial Thermal insulation pipe ：
The polyurethane directly buried thermal insulation pipe has the good characteristics of * * * thermal insulation, waterproof, anti-corrosion, thermal insulation, sound insulation, flame retardant, cold resistant, anti-corrosion, light capacity, high strength, simple and fast construction, and is not afraid of plant root thorns. It has become the Ministry of Industry of construction, transportation, petroleum, chemical, power, refrigeration, etc door It is an indispensable material for heat insulation, waterproof and leak sealing. Directly buried insulation pipe is used for various indoor and outdoor The Conduit , central heating pipeline*** air conditioner Thermal insulation and cold insulation engineering, oil pipeline engineering, steam transmission and other pipeline engineering of pipeline, chemical, pharmaceutical and other industrial pipelines.
Production of polyurethane directly buried insulation pipe:
Using good insulation technology and materials in construction and industry can often achieve twice the result with half the effort. Statistics show that every ton of mineral wool insulation products used in buildings can save one ton of oil a year. The application of Beijing Anyuan Beili Energy Saving Community shows that the coal saving rate per unit area is 11.91 kg standard coal per square meter per year. For thermal insulation of industrial equipment and pipelines, good thermal insulation measures and materials can significantly reduce production energy consumption and cost, improve the environment, and have good economic benefits. For example, in industrial equipment and pipeline engineering, good thermal insulation conditions can reduce the heat loss by about 95%, and the * * * commonly used for thermal insulation materials can be recovered by saving energy about one year.
Advantages of polyurethane insulation pipe for directly buried water supply/polyurethane insulation pipe has become a relatively mature advanced energy-saving technology in some developed countries abroad. With its excellent performance, convenient construction and long service life, it has brought huge economic and social benefits to users. This energy-saving technology is being increasingly applied in China
Product introduction of polyurethane directly buried insulation pipe:
The overall performance of polyurethane directly buried insulation pipe is excellent, and the shot blasting and rust removal treatment on the outer surface of the steel pipe and corona treatment on the inner surface of the outer protective pipe are strictly carried out to further improve the bonding performance of the insulation pipe.
The insulation layer material of polyurethane insulation pipe is rigid polyurethane foam with a density of 60kg/m3 to 80kg/m3, which fills the gap between the steel pipe and the casing pipe, and has a certain bonding strength, so that the steel pipe, outer casing and insulation layer form a solid whole. The foam of polyurethane insulation pipe has good mechanical and thermal insulation properties. It can withstand 120 ℃ in normal environment, and 180 ℃ through modification or combination with other insulation materials.
The polyurethane insulation pipe is divided into three layers from the inside to the outside:
Front layer: working steel pipe layer
Seamless steel pipe, spiral steel pipe and straight seam steel pipe 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 GB8923-1988 standard, and the surface roughness can reach R=12.5 μ m in GB6060.5-88 standard.
The second layer: polyurethane insulation layer:
It is made by injecting the original liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the outer protective layer with a high-pressure foaming machine, which is commonly known as "pipe in pipe foaming".
The third layer: high-density polyethylene protective layer:
Prefabricated into black or * * * polyethylene plastic pipes with a certain wall thickness. Its function is to protect the polyurethane insulation layer from mechanical hard objects, and to prevent corrosion and water.
The polyurethane composite has the characteristics of fine foam, good flow, sufficient toughness and high strength. The * * * large physical property tolerance can meet the customer's various production process requirements. It is suitable for 1020820630, 720, 529, 325, 159 and other pipes with different sizes and specifications. The density distribution is uniform. At the same time, it is suitable for construction in low temperature environment. The special envoy variety can withstand low temperature - 200 ℃ for a long time.
matters needing attention:
During the production process, the polyurethane combination polyether and isocyanate must be accurately weighed in strict accordance with the proportion required in the product manual, and the materials must be fully stirred evenly, otherwise the performance of polyurethane foam will be affected. During storage, it must be tightly sealed to prevent the escape of foaming agent and the entry of water vapor. It should be placed in a dark, dry, cool and ventilated place, away from heat sources and strictly protected from exposure.
Polyurethane insulation pipe is applicable to chemical engineering, urban heat supply network, petroleum, municipal construction and other projects. The applicable insulation range is expanded from - 70 ℃ - 120 ℃ of ordinary PUF to - 70 ℃ - 160 ℃, mainly used for thermal insulation of hot medium materials in pipes and containers. It has good thermal insulation performance and low heat loss, which is 25% of the traditional pipes. Long term use can save a lot of energy. The structure of the outer protective layer is composed of three parts: outer protective layer, thermal insulation layer and anti leakage layer. The outer protective layer is made of polyethylene or glass fiber reinforced plastic or other materials. The laying methods include direct burial, overhead laying and trench laying.
1. The polyurethane directly buried thermal insulation pipe has good thermal insulation performance, and the heat loss is only 25% of the traditional pipe. Long term operation can save a lot of energy and significantly reduce the energy cost.
2. It has strong waterproof and corrosion resistance. It can be directly buried in the ground or water without the need for pipe trenches. The construction is simple and rapid, and the comprehensive cost is low.
3. It also has good corrosion resistance and impact resistance under low temperature conditions, and can be directly buried in the underground frozen soil.
4. The service life can reach 30-50 years. Correct installation and use can reduce the pipe network maintenance cost * * *.
5. * * * system can be set to automatically detect pipe network leakage fault, accurately indicate fault location and automatically * * *.
6. The service life can reach 30-50 years. Pipe diameter: DN15-DN600 Thickness: 15-50mm Purpose: central heating pipe, refrigeration pipe, industrial pipe, etc.
7. Oxygen index: ≥ 27 Density: 40-70kg/m3 Water repellency rate: 0.03kg/m3 Thermal conductivity: 0.022kcal/m.h. ℃
Performance characteristics:
1. The rigid polyurethane with low thermal conductivity and good thermal insulation performance is used as the thermal insulation material, which has good thermal insulation performance.
2. After normal operation, when 130 ℃ water is transported 40 kilometers away, the cooling is only about 1 ℃.
3. It has strong waterproof and corrosion resistance. It can be directly buried in the ground or water without the need for pipe trenches. The construction is simple and rapid, and the comprehensive cost is low.
4. It also has good corrosion resistance and impact resistance under low temperature conditions, and can be directly buried in the frozen soil layer.
5. The prefabricated insulation pipe uses a corrosion-resistant (HDPE: high-density polyethylene) outer sleeve, which is not affected by biological and chemical corrosion.
6. Pipes with various diameters and insulation thicknesses between DN20 and DN1200 and matching pipe fittings (elbows, tees, reducing pipes, fixed joints, etc.) can be provided according to user needs
7. The products comply with the industrial standards CJ/T 114-2000 and CJ/T 115-2001 of the People's Republic of China for urban construction.
8. In order to ensure the trinity of prefabricated directly buried insulation pipes, the outer surface of the steel pipe shall be shot blasted before foaming, and the inner surface of the plastic pipe shall be corona treated. The rust removal grade shall meet the requirements of Sa2.5 in GB/T 8923-1998, and the inner surface tension of the shell pipe shall reach 50 dynes/cm.
9. The polyethylene external protection pipe is made of high-density polyethylene material, supplemented with various additives such as antioxidants, and the quality of raw materials and products are strictly inspected to ensure that the product quality meets the CJ/114-2000 standard and the technical requirements of the external protection pipe for directly buried pipes, which improves the overall quality of the external protection pipe. See the following table for specific technical indicators.
10. The company is equipped with imported and domestic high-pressure foaming machines and hydraulic threading machines, which improves the overall quality of products.
