Due to the influence of environmental factors, insulation materials are used in our daily industrial equipment and pipelines. Insulation materials, whose thermal conductivity coefficient of thermal insulation is generally less than or equal to zero, are planned for thermal insulation materials. In the construction industry in peacetime In the industrial industry, there is a need for good insulation materials. Therefore, a layer of insulation material must be wrapped around the pipe to prevent freezing, prevent heat generation, and prevent condensation. These insulation materials can often provide excellent results. Pipe insulation materials specifically what? What are the advantages of pipe insulation materials ? Next Xiaobian will introduce them to you.
Pipe insulation - advantages
1 Reduce project cost.
According to calculations by related departments, dual-control heat supply pipes can generally be reduced by 25% of the construction cost (using FRP as a protective layer) and 10% (using high-density polyethylene as a protective layer).
2 Low heat loss and energy saving.
The thermal conductivity is: λ = 0.013-0.03kcal/m?h?oC, much lower than other commonly used pipe insulation materials, thermal insulation effect increased by 4 to 9 times. In addition, its water absorption is very low, about 0.2 kg/m2. The reason for the low water absorption is that the closed cell ratio of the polyurethane foam is as high as about 92%. The low thermal conductivity and low water absorption, coupled with high density polyethylene or FRP shells with good thermal insulation properties and good external water resistance, have changed the condition of the traditional trench laying heating pipeline “wet cotton padded jacketâ€, and greatly reduced the number of heating pipes. The overall heat loss, thermal network heat loss is 2%, less than the international standard of 10%.
3. Anti-corrosion, good insulation performance and long service life.
The insulation of the oil pipeline is due to the rigid polyurethane foam insulation layer tightly bonded to the steel pipe outer skin, which insulates the infiltration of air and water and can play a good anti-corrosion effect. At the same time, its foaming pores are closed and the water absorption is small. The high-density polyethylene shell and glass fiber reinforced plastic shell have good anti-corrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is hardly affected by the outside air and water. As long as the internal water quality of the pipeline is well handled, according to the introduction of foreign materials, the service life of the oil pipeline insulation can reach more than 50 years, which is 3 to 4 times longer than the traditional trench laying and overhead laying.
4. It occupies less land, is quick to construct and is conducive to environmental protection.
Directly buried heat pipes do not need to build huge trenches. They only need to insulate the underground heat insulation pipes, which greatly reduces the project's land occupation, reduces earthwork excavation volume by more than 50%, and reduces civil engineering masonry and concrete volume by 90%. At the same time, the insulation pipe processing and the trenching in situ are carried out in parallel, and only the on-site joints can shorten the construction period by more than 50%.
5 Security.
In addition to pipe insulation produced outside China, leak alarm lines are provided. Once a leak occurs in a certain area of ​​the pipeline, transmission through the alarm line can reveal the exact location and leakage of seepage and leakage of the thermal insulation pipe on the special detection instrument. The extent of the size, in order to notify the infiltration personnel to quickly deal with the leaking pipe section to ensure the safe operation of the heating pipe network. The domestic production of thermal insulation pipe is currently equipped with a leakage alarm line, which is yet to be filled.
Pipe insulation is mainly composed of four parts.
(1) Working steel pipe: According to the technical requirements of the transmission medium, there are separately used seam steel pipe, seamless steel pipe, double-sided submerged arc spiral welded steel pipe.
(2) Insulation: Polyurethane rigid foam.
(3) Protective shell: 1 high-density polyethylene or glass steel is used.
(4) Leakage alarm line: When manufacturing oil pipeline insulation, an alarm line is buried in the insulation layer near the steel pipe. Once a leak occurs in a certain part of the pipeline, it can be alarmed on the dedicated detection instrument through the conduction of the alarm line. The exact location of the leak and the extent of the leak are shown so that the maintenance personnel can be notified to quickly handle the leaked pipe section and ensure the safe operation of the heating network.
What are the pipe insulation materials
1, glass wool
Glass wool, which has the characteristics of good formability, small bulk density, low thermal conductivity, etc., glass wool also has extremely high corrosion resistance, and has good chemical properties in a chemically corrosive environment. The adaptability of glass wool is aimed at the insulation of air conditioners, the insulation of exhaust pipes, the insulation of boilers and the insulation of steam pipes.
2, composite silicate
The advantage of composite silicates is their low thermal conductivity, excellent insulation properties, and low bulk density of insulation materials at elevated temperatures, compared to other pipe insulation materials, composite silicates. The construction method is more convenient, does not cause any stimulation and pollution to the employees, does not cause harm to the human body, can be arbitrarily cut and rolled, and its transportation is also relatively safe and reliable, and the loss is low. Composite silicates have been widely used in the petrochemical industry, electrical industry, metallurgical industry, and some of our national defense industries. We have insulated and insulated various types of equipment such as tanks and pipes. Silicates are considered by us as the ideal material for energy conservation.
3, polyurethane
Polyurethane, which is mostly used in cold storage, refrigerated trucks, or fresh-keeping boxes, can also be used as a heat-insulating layer for color steel sandwich panels. Polyurethanes are sometimes used in petrochemical tanks. Polyurethane also has the effect of keeping heat and cooling, and has been applied to the petrochemical and metallurgical industries, especially for the application of the outer layer protection of underground buried all kinds of composite buried pipes.
4, rock wool tube
Rock wool pipe is widely used in boilers for petroleum and chemical industry, metallurgy, shipbuilding, and textile industries, or equipment pipelines for thermal insulation, and is sometimes widely used in partition walls in the construction industry, indoor ceilings and wall insulation and other thermal insulation Insulation. However, insulation of pipelines in the electric power industry, petrochemical industry, and light industry is used for heat insulation and heat preservation in various pipelines, especially for smaller pipelines, and it can be implemented quickly and waterproof. With special properties such as moisture resistance, hydrophobicity, and temperature-removal, it is suitable for use in a rainy environment.
New pipeline insulation material
The insulation pipe is composed of a steel pipe, a glass fiber reinforced plastic inner sheath, and a glass fiber reinforced plastic outer shell. Its feature is that it also includes a high temperature insulation insulation layer, a lubricating layer, and an elastic seal. The utility model effectively solves the problem of heat preservation, sliding lubrication and waterproofness of the exposed tube end of a prefabricated direct-buried heat preservation tube used for high temperature heat transmission of 130°C-600°C in a concentrated urban heating system.
Insulation pipes are widely used in liquid and gas transmission pipe networks, chemical pipe insulation projects in petroleum, chemical, central heating and heating networks, central air-conditioning ventilation pipes, and municipal engineering. The insulation of the oil pipeline is a direct-buried prefabricated insulation pipe with good insulation performance, safety and reliability, and low construction cost. Effectively solve the problem of insulation, sliding lubrication and waterproofness of exposed pipe ends of prefabricated direct-buried thermal insulation tubes for high-temperature heat transmission of 130°C-600°C in central urban heating. The insulation of oil pipelines not only has the advanced technology and practical performance that are difficult to compare with traditional trenches and overhead laying pipelines, but also has significant social and economic benefits, and is also a powerful measure for heating and energy saving. The insulation of oil pipelines adopts direct-buried heating pipeline technology, which indicates that the technology development of China's heating pipelines has entered a new starting point.
Summary: The above is related to pipe insulation materials and the advantages of pipe insulation materials. It is for reference only and hopes to help everyone. If you want to know more related information, you can pay attention to this website information.
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