What are the insulation materials of steam pipes, and what materials are generally used for steam pi

Steam pipelines are now used: steel jacket steel direct buried insulation pipe (also called high-temperature steam insulation pipe) insulation materials are: 1, rock wool, 2, aluminum silicate.

The steel sleeve steel directly buried insulation pipe is composed of: it is composed of internal working steel pipe, temperature-resistant and high-temperature inorganic zinc-rich primer, aluminum silicate rent reduction layer, calcium silicate, aluminum foil reflective layer, polyurethane insulation layer, outer protective steel pipe, and outer FRP anti-corrosion.

Have a great day.

The insulation materials of steam pipelines mainly include: non-asbestos microporous calcium silicate, high-temperature resistant centrifugal glass wool, aluminum silicate needle-punched blanket, nano aerogel, rock wool, GQ composite silicate tube shell, polyurethane, etc.

1. Rock wool pipe, rock wool pipe is mostly used for boiler or equipment pipeline insulation in petrochemical, metallurgy, shipbuilding and textile industries, and is sometimes widely used in partition walls in the construction industry. However, the insulation of pipelines in the power industry, petrochemical industry, light industry and other industries is used in the thermal insulation and thermal insulation measures of various pipelines, especially for pipelines with small pipe mouths, which can be implemented quickly, and the waterproof rock wool pipe has special properties such as moisture-proof, hydrophobic and temperature discharge, and is suitable for use in a rainy environment, and it has water-repellent properties.

2. Glass wool, glass wool, it has the characteristics of good formability, small bulk density, low thermal conductivity, etc., and the corrosion resistance of glass wool is also extremely high, and it has good chemical properties in a chemically corrosive environment. The adaptation characteristics of glass wool are for the insulation of air conditioners, exhaust pipes, boilers and steam pipes.

3. Urethane, polyurethane, it is mostly used in the production of cold storage, refrigerated trucks or fresh-keeping boxes, and can also be used as a thermal insulation layer for color steel sandwich panels, and polyurethane is sometimes used in petrochemical tanks. Polyurethane also has the function of thermal insulation and cold insulation, and has been applied to petrochemical and metallurgy, especially in the outer layer protection of various composite directly buried pipelines in the ground.

The above explanation is what insulation materials are used for steam pipelines, you can choose according to the way you apply, if you really don't know about the insulation materials, you can consult professionals and sales staff, and you must not make blind purchases. At the same time, you should also learn to distinguish the authenticity of the insulation material, so that you can better choose a material with good performance and affordability.

Seamless steel pipe.

Pure steam piping is a kind of mechanical properties and thermal insulation properties, which can normally withstand high temperatures of 120 degrees Celsius, and can reach 180 degrees Celsius if modified by combining with other thermal insulation materials. In the case of various cold and hot water pipe insulation projects, generally low-pressure steam with 20 seamless pipes, medium-pressure steam with 20g or 15crmo seamless pipes, the following steam with 20 steel, to steam with 20g or 15crmo, above steam with chromium-molybdenum steel or stainless steel.

Precautions for the use of steam pipes.

It should be noted that when the steam pipeline is started, the trap valve on the pipeline should be opened sequentially for draining and draining.

It is necessary to pay attention to the temperature rise of the warm pipe process, and check the expansion of the pipe at each fulcrum, and check whether there is leakage in the weld, flange and other places.

It should be noted that as the temperature increases, the trap is drained and the trap valves are closed. Slowly open the steam door, increase the pressure to normal pressure, and check again whether there is leakage in all parts of the steam pipeline and the expansion of each fulcrum after the pressure is raised to normal pressure.

The selection of pipeline materials should meet the following requirements:

1. Seamless steel pipes should be used for steam pipes with pressure greater than 1 0MPa gauge pressure and temperature greater than 200, hot water pipes with pressure greater than 1 6MPa (gauge pressure) and temperature less than or equal to 180. Steam pipes, hot water and condensate pipes with a pressure of less than 1.6MPa (gauge pressure) and a temperature of less than 200 can be made of seamless steel pipes or welded steel pipes;

2. When the thermal pipeline is laid in an impassable trench or directly buried, a seamless steel pipe should be used. When overhead, semi-passable or passable trenches are laid, seamless steel pipes or welded steel pipes may be used, and shall comply with the provisions of paragraph 1 of this article.

Basis: boiler room design code GB 50041-2008

18 4 Pipes and Accessories.

18 4 1 The selection of pipeline materials should meet the following requirements:

1. Seamless steel pipes should be used for steam pipes with pressure greater than 1 0MPa gauge pressure and temperature greater than 200, hot water pipes with pressure greater than 1 6MPa (gauge pressure) and temperature less than or equal to 180. Steam pipes, hot water and condensate pipes with a pressure of less than 1.6MPa (gauge pressure) and a temperature of less than 200 can be made of seamless steel pipes or welded steel pipes;

2. When the thermal pipeline is laid in an impassable trench or directly buried, a seamless steel pipe should be used. When overhead, semi-passable or passable trenches are laid, seamless steel pipes or welded steel pipes may be used, and shall comply with the provisions of paragraph 1 of this article.

18 4 2 The nominal diameter of outdoor heating pipes should not be less than 25mm.

18 4 3 Valves shall be installed on the branch pipes of hot water, steam and condensate pipes leading to each user. When the length of the branch pipe is less than 20m, it can not be installed.

18 4 4 The high and low points of hot water, steam and condensate pipes shall be equipped with air release valves and water discharge valves respectively.

18 4 5 The straight pipe section of the steam pipeline should be equipped with a starting trap every 400-500m when going down the slope and every 200 300m when the reverse slope is reversed. Frequent drains should be set up at the low point and vertical elevation of the steam pipes.

18 4 6 The frequent drainage of steam pipes, when possible, should be discharged into condensate pipes.

18 4 7 The place where the trap is installed shall be equipped with an inspection valve for checking the trap or other inspection accessories. The filter should be set up in front of the trap without a filter device.

18 4 8 Outdoor heating calculation temperature less than -5 in the area, overhead laying on the discontinuous operation of the pipe, and outdoor heating calculation temperature less than -1o in the area, overhead laying.

Gray cast iron equipment and accessories should not be installed on the pipeline. In areas where the calculated temperature of outdoor heating is less than or equal to -30, the valves and accessories installed on the overhead pipes shall be made of steel.

The material of the steam pipe has little to do with the pressure, if the temperature is low, not more than 450 degrees Celsius, use No. 20 steel, the pressure is related to the thickness of the pipe.

The steam temperature is less than 450 degrees with 20 steel.

The steam temperature is less than 530 degrees Celsius.

CRMO steel, we generally use 15CRMO (G) more.

What material is better to use for 500 degrees of lava pipes?

Materials such as rock wool pipes, glass wool and polyurethane foam, each with its own advantages and disadvantages. The advantages of rock wool are mainly in the first place, which is very cheap, but the temperature resistance is poor, and the environmental protection is low. Glass wool has good thermal insulation, but the pressure resistance is not good, while polyurethane foam has a good sealing effect and good compression resistance, but the temperature resistance is relatively poor.

How to choose exterior wall insulation?

1. When purchasing, first of all, we should pay attention to its thermal insulation performance. Moreover, it is necessary to choose the one with small thermal conductivity, which can not only meet the construction requirements, but also be convenient during construction, so as not to increase the difficulty of construction. At the same time, it also depends on the thermal insulation effect of the material, if the insulation is not good, the interior will feel very hot, affecting the living effect.

2. For this material, it is necessary to choose a material with good insulation, which not only can be insulated, but also has a fireproof function, which can ensure the safety of the building during construction. At the same time, the water absorption rate needs to be taken into account. As an exterior wall material, it is easy to come into contact with rainwater, and if the water absorption rate is high, it is easy to absorb water and increase thermal conductivity, so it is important to choose a material with low water absorption.

3. Generally speaking, low-density materials can reduce the load and facilitate the construction of exterior walls, so this point cannot be ignored when purchasing materials. When we buy insulation materials, we also need to take into account the convenience of construction and maintenance, because the construction of the exterior wall is a difficult job, and if the materials are not good, it will affect the entire construction progress.