What are the advantages and characteristics of pipeline insulation materials?

Due to the influence of environmental factors, thermal insulation materials are used in our daily industrial equipment and pipelines. Generally, the thermal conductivity of thermal insulation materials is less than or equal to 0.2, which is planned as thermal insulation materials. In the usual construction industry and industrial industry, good thermal insulation materials are needed, so it is necessary to wrap a layer of thermal insulation materials outside the pipeline to prevent freezing, heat dissipation and condensation. These thermal insulation materials can often play a very good role. What are the insulation materials for pipelines? What are the advantages and characteristics of pipeline insulation materials? Next, Bian Xiao will introduce them to you.

Advantages and characteristics of pipeline thermal insulation

1 Reduce the project cost.

According to the calculation of relevant departments, the double-pipe heating pipeline can generally reduce the project cost by about 25% (using FRP as protective layer), 10% (using high-density polyethylene as protective layer).

2. Low heat loss and energy saving.

Its thermal conductivity λ=0.0 13—0.03kcal/m? h？ OC is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is improved by 4~9 times. Moreover, its water absorption is very low, about 0.2kg/m2. The reason of low water absorption is that the closed cell rate of polyurethane foam is as high as 92%. The low thermal conductivity and water absorption, coupled with the insulation layer and the high-density polyethylene or glass fiber reinforced plastic protective shell with good waterproof performance outside, have changed the situation of "wearing wet cotton-padded jacket" in the traditional trench laying of heating pipelines, greatly reduced the overall heat loss of heating pipelines, and the heat loss of heating pipelines is 2%, which is less than 10% required by international standards.

3. Corrosion resistance, good insulation performance and long service life.

Because the polyurethane rigid foam insulation layer clings to the steel pipe skin, which isolates the penetration of air and water, the insulation of oil pipeline can play a good role in corrosion prevention. At the same time, its foaming holes are closed and its water absorption is very small. High-density polyethylene shell and glass fiber reinforced plastic shell have good corrosion resistance, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is not easy to be eroded by external air and water. As long as the water quality in the pipeline is well treated, according to foreign data, the service life of oil pipeline insulation can reach more than 50 years, which is 3~4 times longer than that of traditional trench burial and overhead laying.

4. Less land occupation, fast construction and environmental protection.

Directly buried heating pipeline does not need to build a huge trench, but only needs to bury the insulation pipe underground, which greatly reduces the engineering area, reduces the earthwork excavation by more than 50%, and reduces the civil masonry and concrete by 90%. At the same time, the processing of insulation pipe is carried out in parallel with on-site slotting, and the construction period can be shortened by more than 50% only by on-site docking.

5 safe.

Pipeline insulation produced outside China is equipped with leakage alarm lines. Once there is a leak somewhere in the pipeline, the accurate position and leakage degree of the insulation pipeline can be displayed on the special detector table through the conduction of the alarm line, so as to inform the leak detector to deal with the leaking pipe section quickly and ensure the safe operation of the heating pipe network. At present, there is no leakage alarm line at the end of insulation pipe produced in China, which needs to be filled.

Pipeline insulation is mainly composed of four parts.

(1) working steel pipe: according to the technical requirements of conveying medium, slotted steel pipe, seamless steel pipe and spiral welded steel pipe with double-sided submerged arc welding are adopted respectively.

(2) Insulation layer: rigid polyurethane foam is used.

(3) Protective shell: 1 high density polyethylene or glass fiber reinforced plastic 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 certain part of the pipeline leaks, through the conduction of the alarm line, an alarm can be given on the special detection table, and the exact location and degree of the leakage can be displayed, so as to inform the maintenance personnel to deal with the leaking pipe section quickly and ensure the safe operation of the heating network.

What are the insulation materials for pipes?

1, glass wool

Glass wool has the characteristics of good formability, low bulk density and low thermal conductivity, and has extremely high corrosion resistance and good chemical properties in chemical corrosive environment. The adaptive characteristics of glass wool are aimed at the insulation of air conditioners, exhaust pipes, boilers and steam pipes.

2. Composite silicate

Composite silicate has the advantages of low thermal conductivity, excellent thermal insulation and low bulk density at high temperature. Compared with other pipe insulation materials, the construction method of composite silicate is more convenient, which has no stimulation and pollution to employees and no harm to human body. Can be cut at will, transportation is relatively safe and reliable, and the loss is low. Composite silicate has been widely used in China's petrochemical industry, electrical industry, metallurgical industry and some national defense undertakings, and is used for thermal insulation of various storage tanks and pipelines, so composite silicate is considered as an ideal energy-saving material.

3. Polyurethane

Polyurethane is mostly used to make cold storage, refrigerated trucks or fresh-keeping boxes, and can also be used as the insulation layer of color steel sandwich panels. Polyurethane is sometimes used in petrochemical storage tanks. Polyurethane also has the function of heat preservation and cold preservation, and has been applied in petrochemical and metallurgical fields, especially in the outer layer protection of buried pipelines.

4. rock wool tube

Rock wool tube is mostly used for thermal insulation of boilers or equipment pipelines in petrochemical, metallurgical, shipbuilding, textile and other industries, and sometimes it is also widely used for partition walls in construction industries, such as indoor ceiling and wall thermal insulation. In power, petrochemical, light industry and other industries, all kinds of pipeline insulation measures are adopted, especially for pipelines with small openings, which can be implemented quickly. Waterproof rock wool tube has special properties, such as moisture-proof, hydrophobic and temperature-discharging, and is suitable for use in rainy environment. It is water repellent.

New pipeline thermal insulation material

The insulation pipe is composed of steel pipe, glass fiber reinforced plastic inner sheath and glass fiber reinforced plastic outer shell, and is characterized by also comprising a high-temperature resistant insulation layer, a lubricating layer and an elastic sealing element. The utility model effectively solves the problems of heat preservation, sliding lubrication and waterproof of the exposed pipe end of the prefabricated directly buried heat preservation pipe for high-temperature heat transfer at130-600 DEG C in urban central heating.

Thermal insulation pipelines are widely used in liquid and gas transmission pipelines, chemical pipeline thermal insulation engineering, petroleum, chemical industry, central heating and heating pipe network, central air conditioning ventilation pipelines, municipal engineering and so on. Oil pipeline thermal insulation is a kind of directly buried prefabricated thermal insulation pipe with good thermal insulation performance, safe and reliable heating and low engineering cost. It effectively solves the problems of heat preservation, sliding lubrication and waterproofing of exposed pipe ends of prefabricated directly buried heat preservation pipes for high-temperature heat transfer in urban central heating 130℃-600℃. Thermal insulation of oil pipeline not only has advanced technology and practical performance incomparable to traditional trench and overhead pipeline, but also has remarkable social and economic benefits, which is a powerful measure for heating and energy saving. Directly buried heating pipeline technology is adopted for oil pipeline insulation, which indicates that the development of heating pipeline technology in China has entered a new starting point.