The difference between steam and hot water direct buried insulation pipe

The steam directly buried insulation pipe is generally more than 200 for transporting high-temperature steam, and the hot water directly buried insulation pipe is for transporting air conditioning for return water, hot water and other medium not exceeding 150.

In terms of structure, the steam direct buried insulation pipe is composed of a working steel pipe, an insulation layer and an outer casing pipe; The hot water direct buried insulation pipe is generally composed of a working pipe, a polyurethane insulation layer, and a polyethylene outer protection pipe.

In terms of materials, the working steel pipe of the steam direct buried insulation pipe is generally made of seamless steel pipe or spiral steel pipe, and the insulation layer can choose various insulation materials such as polyurethane, glass fiber fiber, aluminum silicate, calcium silicate, etc., and the outer protection pipe can also choose spiral steel pipe and longitudinal steel pipe; Hot water direct buried insulation pipes generally choose seamless steel pipes, PVC pipes, PPR pipes and other small-diameter pipes or pipes that are not resistant to ultra-high temperatures.

In terms of applicable projects, steam directly buried insulation pipes are generally used in projects with large diameters, and hot water directly buried insulation pipes are generally used in the case of small engineering quantities and small pipe diameters in the plant area.

There are some other differences that are not listed one by one, but they are relatively small.

The steel jacket steel direct buried steam insulation pipe (steel jacket steel direct buried steam insulation pipe) is composed of a combination of steel pipes for transporting medium, anti-corrosion sheath steel pipes, and ultra-fine glass wool filled between steel pipes and jackets and steel pipes. The insulation structure of steel jacket steel directly buried steam insulation pipe is divided into internal sliding type and external sliding type according to the different sliding methods: internal sliding type and external sliding type

Steel jacket steel direct buried steam insulation pipe is widely used as liquid and gas transportation pipe network, chemical pipeline insulation engineering, petroleum, chemical, central heating network, air conditioning ventilation pipeline, municipal engineering, etc. The insulation, sliding lubricant and air permeability of the exposed pipe end are directly buried with steel jacket steel. The insulation pipe not only has the advanced equipment technology and practical performance that are difficult to compare with the traditional trench and the overhead underpass pipeline, but also has obvious social and economic benefits, and is also a powerful measure for heating and energy saving.

Pipe type: seamless steel pipe or spiral seam submerged arc welded steel pipe Insulation layer Material type: aluminum silicate medium and centrifugal glass wool filling Coat steel pipe Pipe type:

Spiral seam welded steel pipe.

Hello, the differences are as follows: 1First of all, the difference is formed due to the different insulation structures of the pipes: *, the directly buried hot water pipes use the "trinity" prefabricated insulation pipes, that is, the polyurethane insulation layer is tightly bonded to the outer surface of the working steel pipe.

However, due to the high heat resistance temperature of polyurethane is 140, the directly buried steam pipeline can only be made into a wrapping composite insulation structure, that is, high temperature insulation materials must be used, and this wrapping structure makes the working steel pipe and the insulation layer must be separated, and it is determined that the directly buried steam pipeline cannot be designed in accordance with the design method of the directly buried hot water pipeline. 2.Differences caused by different operating parameters of the pipe network:

The direct buried steam pipeline is delivered to the high-temperature steam medium, because of its high temperature, so the design method is different from the direct buried hot water pipeline.

The directly buried insulation pipe is made of high-performance polyether polyol composition and multiple methyl polyphenyl polyisocyanate as raw materials through chemical reaction foaming. The directly buried insulation pipe has the excellent characteristics of light capacity, high strength, thermal 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.

Directly buried insulation pipes are used for various indoor and outdoor pipelines, central heating pipelines, air conditioning pipelines, chemical, pharmaceutical and other industrial pipelines for thermal insulation and cold preservation projects. Since the birth of polyurethane synthetic materials in the thirties, the directly buried insulation pipe has been rapidly developed as an excellent thermal insulation material, and its application range is becoming more and more extensive, and it is widely used in various heating, refrigeration, oil transportation, steam transportation and other pipelines because of its simple construction and remarkable energy-saving and anti-corrosion effect. It is widely used in various heating, refrigeration, oil transportation, steam transportation and other pipelines.

Reduce heat loss and save energy.

Pipeline anti-corrosion can be made of glass fiber reinforced plastic or epoxy coal asphalt anti-corrosion, insulation materials include glass wool, rock wool calcium silicate, aluminum silicate and the like, these are high-temperature resistant materials, aluminum foil is a thermal insulation material.

The direct burial depth is about 1 meter Pipeline anti-corrosion can be made of FRP or epoxy coal asphalt anti-corrosion, insulation materials include glass wool, rock wool calcium silicate, aluminum silicate and the like, these are high-temperature resistant materials, aluminum foil is a thermal insulation material, and the specific can be manufactured by Hebei Juqing pipeline.

At a depth of half a meter to one meter, the epoxy asphalt for anti-corrosion is matched, the aluminum silicate inside, the rock wool outside, don't forget the outer sheath!

1. The most common polyurethane foam is currently the largest for insulation, and the outermost layer is reinforced with asphalt glass cloth (divided into ordinary grade, reinforced grade, extra reinforced grade, etc.), which plays the role of moisture-proof and external erosion;

2. The outer protective layer can also be epoxy coal asphalt, and a layer of plastic cloth is applied, which is also a method of outer protective layer.

3. The depth of direct burial shall not be less than meters, and under normal circumstances, it is required to be in meters.

The direct burial depth is generally required to be more than 1 meter, and the anti-corrosion is to brush the oil in the solder joint, which is generally more than 2 times, DN150 or more, and 3 times The insulation material is generally polyethylene, and the insulation material does not know that my side is hot water heating and does not involve.

Advantages of steel jacket steel steam insulation pipe: polyurethane prefabricated directly buried insulation pipe has become a relatively mature advanced technology in some developed countries abroad. In the past ten years, China's heating engineering and technical personnel have digested and absorbed this method. Advanced technology is promoting the development of domestic pipe network laying technology to a higher level, and has become a relatively mature advanced technology in some developed countries abroad.

In the past ten years, China's heating engineering and technical personnel have been promoting the development of domestic pipe network laying technology to a higher level by digesting and absorbing this advanced technology.

Polyurethane prefabricated directly buried insulation pipe is tightly bonded to the outer skin of the steel pipe due to the polyurethane rigid foam insulation layer, which 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. The reason for the low water absorption is due to the high closed-cell rate of polyurethane foam of about 92%. Low thermal conductivity and low water absorption, coupled with the insulation layer and the high-density polyethylene or FRP protective shell with good waterproof performance outside, have changed the situation of the traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reducing the overall heat loss of the heating pipeline, and the heat loss of the heat network is 2%, which is less than the international standard requirement of 10%.

The practical results of more than ten years have fully proved that the laying method of polyurethane cheese insulation direct buried pipe has many advantages compared with traditional trench and overhead laying.

Advantages of steel jacket steel steam insulation pipe - advantages and characteristics.

1. Reduce the cost of the project.

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

2. Low heat loss and energy saving.

Its thermal conductivity is: h?

OC, which is much lower than other commonly used pipe insulation materials in the past, and the insulation effect is increased by 4 9 times. In addition, its water absorption rate is very low, and the reason for the low water absorption rate is due to the closed cell rate of polyurethane foam as high as about 92. Low thermal conductivity and low water absorption, coupled with the insulation layer and the high-density polyethylene or FRP protective shell with good waterproof performance outside, have changed the situation of the traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reducing the overall heat loss of the heating pipeline, and the heat loss of the heat network is 2%, which is less than the international standard requirement of 10%.

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

The high-temperature prefabricated directly buried insulation pipe is tightly bonded to the outer skin of the steel pipe due to the polyurethane rigid foam insulation layer, which 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. The service life of high-density polyethylene shell and glass can reach more than 50 years, which is 3 4 times higher than that of traditional trench laying and overhead laying.

4. It occupies less land, the construction is fast, and the advantages of steel sleeve steel steam insulation pipe are conducive to environmental protection.

Hongbang pipeline steam insulation pipe has the following characteristics:

1. Strong waterproof and anti-corrosion performance, in areas with heavy industrial pollution, the anti-corrosion layer can not be destroyed under long-term erosion of acid rain;

2. Longer service life, after testing, the life of the insulation pipe is more than 25 years, which greatly reduces the cost of pipe network replacement or repair;

3. The thermal insulation performance is more prominent, and there are data to prove that the heat loss of the insulation pipe is small, which makes the temperature drop of long-distance transportation small, which can significantly reduce the cost and improve the quality of steam supply;

4. Good impact resistance, wind and sun will not be affected;

5. It has good mechanical energy and thermal insulation performance.

Steam insulation pipe products can greatly save heat loss, especially suitable for long-distance heat energy transmission projects, and are widely used in liquid and vapor transportation pipe networks, especially saturated steam, superheated steam, etc. The application scope of insulation pipe includes: chemical pipeline insulation engineering, petroleum, chemical industry, central heating network, municipal engineering, etc.; Insulation pipes have a wide range of applications.

Steam insulation pipe is a kind of steam insulation pipe with good insulation performance, more safe and reliable, and low project cost. It effectively solves the problem of 130 450 high temperature heat transmission and thermal insulation in urban central heating. The steam insulation pipe not only has the advanced technology and practical performance that is difficult to be compared with the traditional pipeline, but also has significant social and economic benefits, and is also a powerful measure for heating and energy saving.

The steam insulation pipe is reliable for long-term use in the thermal pipeline and easy to maintain. After research and analysis, it is found that the steam insulation pipe has the following characteristics:

1. Strong waterproof and anti-corrosion performance, in areas with heavy industrial pollution, the anti-corrosion layer can not be destroyed under long-term erosion of acid rain;

2. Longer service life, after testing, the life of the insulation pipe is more than 25 years, which greatly reduces the cost of pipe network replacement or repair;

3. The thermal insulation performance is more prominent, and there are data to prove that the heat loss of the insulation pipe is small, which makes the temperature drop of long-distance transportation small, which can significantly reduce the cost and improve the quality of steam supply;

4. Good impact resistance, wind and sun will not be affected;

5. It has good mechanical energy and thermal insulation performance.

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.

There are many structural forms of steam insulation pipes, but the root cause and mechanism of their production are nothing more than two forms derived from the development of directly buried hot water pipes and pipe trenches, which can be divided into external sliding type and internal sliding type

Outer sliding steel sleeve steel steam insulation pipe:

The design idea of this structural form comes from the thermal pipe trench, the pipe trench is changed from the commonly used brick or concrete structure to the steel casing, and the bracket is arranged in the steel casing, so that the working steel pipe and the corresponding insulation material and the external steel casing pipe slide, that is, the working steel pipe is in close contact with the insulation material, and the working steel pipe is supported in the steel outer casing pipe through the support, and the bracket rolls inside the steel outer casing pipe, forming the structure of "steel pipe ditch". The structural form mainly adopts soft insulation material, which effectively solves the problem of increasing friction due to radial expansion, and will not cause eccentricity and crushing of insulation material due to the internal support ring.

Internal sliding steel sleeve steel steam insulation pipe:

In order to improve the temperature resistance of the insulation pipe, a layer of inorganic insulation material with high temperature resistance is generally wrapped outside the working steel pipe, the outer wall temperature is lowered to the range of polyurethane insulation, and then foamed as polyurethane on the outside, and the outer sleeve is wrapped for waterproofing. The characteristics of this structural form are mainly that the sliding between the working steel pipe and the inner layer of hard insulation material is generated, and its disadvantage is that the leakage of heat flow is difficult to deal with, and the thermal displacement of pipe fittings is difficult to compensate for the large diameter steam pipeline, and the self-weight of the working steel pipe in the large-diameter steam pipeline is large, which is easy to cause the eccentricity or crushing of the insulation material, and the internal friction increases.

The above two insulation structures of steel jacket steel steam insulation pipe are used in China. The use of steel jacket external sliding structure is more reliable than the internal sliding in the design theory, the force analysis is simple, the internal air layer is easy to set, and the moisture discharge is better.

The prefabricated directly buried steam collapse group round temperature pipe is composed of working steel pipe, foam insulation layer, and polyethylene plastic outer protection pipe, which are combined outward through the equipment in turn.