In severe cold areas, it is better to use polyurethane pipe shell insulation or composite silicate p

As far as the thermal insulation effect is concerned, it must be polyurethane that has a good effect.

Polyurethane exterior wall insulation layer structure - Langfang Shengheng insulation material.

The first layer: working steel pipe layer According to the design and customer requirements, seamless pipes (GB8163-87) spiral welded pipes (GB9711-88; SY T5038-92) and longitudinal welded pipe (GB3092-93). After the surface of the steel pipe is treated by the advanced shot blasting and rust removal process, the rust removal grade of the steel pipe can reach the SA2 grade in the GB8923-1988 standard, and the surface roughness can reach R=micron in the standard.

The second layer: polyurethane insulation layer is made by injecting rigid polyurethane foam stock solution into the cavity formed between the steel pipe and the outer sheath at one time with a high-pressure foaming machine. It is commonly known as the "tube-in-tube foaming process".

Its function is waterproof, the second is heat preservation, and the third is to support the self-weight of the heating network. When the temperature of the conveying medium is: -50 -120, rigid polyurethane foam is selected as the insulation layer.

The third layer: high-density polyethylene protective layer is prefabricated into a certain wall thickness of black (yellow) plastic pipes, which are used to protect the polyurethane insulation layer from mechanical hard objects, and to prevent corrosion and waterproofing.

Product structure form: prefabricated directly buried steam insulation pipe consists of a rent reduction layer, a thermal insulation layer, a reflective layer, a fastening steel belt, a sliding support, an air layer, an outer protective steel pipe, and a spraying poly.

Urethane, winding FRP composition.

Features; The steel pipe is used as the outer protective layer, which has high strength. It is not easy to be damaged and can withstand large upper loads, and in order to achieve a long life, the steel casing needs to be treated with anti-corrosion.

The design of the rolling support structure is reasonable, the rolling friction is small, the force of the fixed support is reduced, the mechanical analysis principle is simple, and the stability and safety of the pipeline are greatly improved.

The vacuum layer completely eliminates the heat conduction and heat convection in the air layer, and greatly reduces the heat loss. Compared to the air layer structure, it can be reduced at the same insulation thickness.

Outer wall temperature 8-13 °C.

The vacuum extraction device completely solves the problem that the inner wall of the outer steel casing is easy to be corroded by hot and humid air, and greatly improves the operating life of the directly buried steam pipeline. The product life is increased to 30 years.

The vacuum extraction device completely solves the problem that every 50-60m in the air layer structure must be set up with a pair of tide discharge pipes, which greatly reduces the damage rate of the outer casing pipe and makes the pipeline.

It is more beautiful along the line. At the same time, the cost of the increase due to the installation of the tide drain pipe is reduced by about 50 m.

Core tips: The above is a detailed introduction of "polyurethane directly buried insulation pipe, polyurethane directly buried insulation pipe**, polyurethane direct buried insulation pipe manufacturer", you can contact the seller of polyurethane directly buried insulation pipe here to understand the specifications, models, and all other information of polyurethane directly buried insulation pipe in more detail.

In modern life, pipe insulation materials are one of our common ones, there are many kinds of pipe insulation materials on the market, common pipe insulation materials are rock wool pipe shell, glass wool pipe shell, aluminum silicate pipe shell, rubber and plastic pipe shell, silicate pipe shell, polyurethane insulation pipe and so on, each has its own characteristics and advantages, the following will give you a specific introduction to the characteristics of pipeline insulation materials.

1. Introduction to the characteristics of pipeline insulation materials.

The purpose of thermal insulation is to reduce the heat loss caused by the heat transfer of the pipeline of the heat medium, and the pipe insulation can save the heat source and reduce the operating cost of the system, so in the indoor heating system, the main pipe and the main riser pipe for water supply and return laid in the trench generally need to take insulation measures.

The insulation material of heating pipes should have heat resistance, flame retardancy, low thermal conductivity, low moisture absorption and no corrosion. In order to strengthen the mechanical strength, it is generally made into a tile shape, and rock wool pipe shells are commonly used; Ultra-fine glass wool tube shell, polyurethane vinegar foam tile; Perlite tiles and other insulation materials.

The thickness of the insulation layer should be reasonably and economically selected. If the insulation layer is too thin, it will increase the heat loss; If the insulation layer is too thick, it will increase the surface area for heat dissipation, which will also increase heat loss. Generally, it should be designed, according to the nature of the insulation material, the temperature of the heat medium and other factors to determine the thickness of the insulation layer, the thickness of the common use is 40 50

The insulation layer is generally composed of anti-rust paint, insulation materials, moisture-proof layer (used for pipelines in the trench), protective layer, anti-corrosion layer (used in the trench or directly buried pipeline) and topcoat or fireproof coating).

2. Commonly used pipeline insulation materials.

1. Rock wool tube shell. It is used for the insulation of all kinds of pipelines, including petroleum, electricity, heating, industry, etc., mainly for the thermal insulation and insulation of pipelines and the prevention of pipeline freezing and cracking.

2. Glass wool tube shell. It is used for the specific insulation of various pipelines (including refrigeration, hot gas, hot water, etc.), and is widely used in the insulation of thermal power pipelines, air conditioning and refrigeration equipment. Applicable temperature: 454°C

3. Aluminum silicate tube shell. It is used in high-temperature pipelines of power boilers, high-temperature steam pipelines of thermoelectric power and high-temperature steam pipelines of chemical industry. Applicable temperature: 1000 °C. (used for high-temperature pipelines in the power industry).

4. Rubber and plastic tube shell. The rubber and plastic pipe has a smooth nature, an elegant appearance, and can be used for a long time. It is used in air conditioning, medicine, textile, light industry and other industries. Applicable temperature: -40 120

5. Portland tube shell. As an alternative to aluminum silicate. Its comprehensive cost is low. It has anti-corrosion and impact resistance. The service life can reach 30-50 years. Applicable temperature: -40 800 °C.

6. Polyurethane insulation pipe. This product is mainly used in underground pipeline insulation system, and has excellent cold resistance. It has the advantages of waterproof, anti-corrosion and anti-aging. Applicable temperature: -196 -120.

The thermal conductivity is low, the rigid polyurethane insulation material has good thermal insulation performance, and has excellent thermal insulation.

After the normal operation of the water sent by Celsius to kilometers away, the temperature is only about about Celsius.

There is a strong water resistance and corrosion resistance, no need for pipe ditch, can be directly buried in the ground or water, the construction is simple and fast, and the comprehensive cost is low.

It also has good corrosion resistance and impact resistance at low temperatures, and can be directly embedded in the permafrost.

Corrosion-resistant use of prefabricated insulated pipes (HDPE) Euro III pipes, not subject to biological and chemical corrosion.

According to the needs of users, we provide a variety of pipe diameters and insulated pipes and supporting pipe fittings (elbows, thickness between tees, reducers, fixed joints, etc.).

Characteristics of insulation pipe High temperature prefabricated directly buried insulation pipe - advantages and characteristics 1 It has strong corrosion resistance and waterproof ability, and the comprehensive cost is low According to the calculations of relevant departments, the double-pipe heating pipeline can generally reduce the project cost by about 25% (using FRP as the protective layer) and 10% (using high-density polyethylene as the protective layer). 2. Low heat loss and energy saving. Heat loss is only 25% of that of conventional pipes Directly buried insulated pipe Thermal conductivity Hydrophobicity 3 Long service life Proper installation and use can lead to a network life of 30-50 years with minimal maintenance.

4. Occupy less land and fast construction, which is conducive to environmental protection, can reduce the amount of earthwork excavation by more than 50%, and reduce the amount of civil masonry and concrete by 90%.

Features; Polyurethane insulation pipe has the excellent characteristics of light bulk density, high strength, heat insulation, sound insulation, flame retardant, cold resistance, anti-corrosion, non-water absorption, simple and fast construction, etc., and has become an indispensable material for thermal insulation, waterproof plugging and sealing in construction, transportation, petroleum, chemical, electric power, refrigeration and other industrial sectors.

Low thermal conductivity:

Polyurethane foam has the lowest thermal conductivity of any insulation material, so heat loss from the material is reduced to a minimum.

Waterproof, anti-corrosion, anti-aging:

Because the closed cell rate of polyurethane foam is more than 92%, therefore, the use of polyurethane foam as the insulation layer of directly buried pipelines can not only play the role of thermal insulation, but also effectively prevent the penetration of water, moisture and other corrosive liquids and gases, and prevent the breeding and development of microorganisms.

Polyurethane insulation pipe is popular with people for its excellent performance, convenient construction and long service life.

The formula used in the actual foaming process of polyurethane insulation pipe is mainly composed of the following raw materials. Polyether, polyester or other polyols ——— the main reaction raw materials. Polyisocyanates (e.g. TDI, MDI, PAPI, etc.) – the main reaction feedstock.

Water ——— chain grower, and is also a raw material for the production of carbon dioxide bubbles**. Crosslinkers ——— improve the mechanical properties of foams, such as elasticity. Catalysts (amines and organotins) – catalyze foaming and gelling reaction rates.

Foam stabilizers ——— stabilize the foam and control the size and structure of the pores.

1. Reduce the cost of the project.

2. Low heat loss and energy saving.

3. Anti-corrosion, good insulation performance and long service life.

4. It occupies a small area, the construction is fast, and it is conducive to environmental protection.

5. Safety.

Advantages of polyurethane insulation pipes:It has strong corrosion resistance and waterproof ability, and the comprehensive cost is low.

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

Low heat loss and energy saving. The heat loss is only 25% of the traditional pipe, and the thermal conductivity and hydrophobicity of the directly buried insulation pipe are only 25% of the traditional pipe.

Long service life.

Proper installation and use can lead to a network life of 30-50 years with minimal maintenance.

It occupies less land and the construction is fast, which is conducive to environmental protection.

It can reduce the amount of earthwork excavation by more than 50% and reduce the amount of civil masonry and concrete by 90%.

Polyurethane insulation pipe. Anti-corrosion, good insulation performance and long service life. Because the polyurethane rigid foam insulation layer is tightly bonded to the outer skin of the steel pipe, the directly buried insulation pipe isolates the penetration of air and water, and can play a good anti-corrosion role.

At the same time, its foam pores are closed, and the water absorption is very small. High-density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is very difficult to be eroded by the outside air and water.

As long as the internal water quality of the pipeline is well treated, according to foreign information, the service life of polyurethane insulation pipelines can reach more than 50 years, which is 3 4 times higher than the service life of traditional trench laying and overhead laying. Polyurethane insulation pipe. It occupies less land and is fast in construction, which is conducive to environmental protection.

The directly buried heating pipeline does not need to build a huge trench, only the insulation pipe needs to be buried underground, so it greatly reduces the land occupied by the project, reduces the amount of earthwork excavation by about 50 or more, and reduces the amount of civil masonry and concrete 90. At the same time, the processing of insulation pipe and on-site trenching are carried out in parallel, and only on-site joints are needed, which can shorten the construction period by more than 50.