Is it possible to use asbestos pipes for the chimney and how to do it correctly

Are you thinking of installing asbestos pipes in your chimney? This subject brings up significant issues related to practicality and safety. Historically, asbestos was frequently used in construction because of its durability and resistance to heat. However, because of health concerns about asbestos fibers becoming airborne and possibly causing serious respiratory diseases, its use has decreased.

In certain places, using asbestos for chimney pipes may still be permissible, but it’s important to be aware of the risks. Inhaling asbestos fibers can cause health issues such as mesothelioma and lung cancer. Therefore, if you decide to use asbestos for your chimney, careful handling and upkeep are necessary.

It’s crucial to adhere to tight installation and maintenance guidelines if you choose to move forward with installing asbestos pipes. To stop asbestos fibers from escaping during installation, make sure the pipes are whole and undamaged. Employing a specialist who is aware of the dangers and precautions related to asbestos use is strongly advised.

An asbestos chimney needs to be maintained and inspected on a regular basis to be safe. It is important to keep an eye out for wear or damage because even small amounts of damage can cause dangerous fibers to come loose. By taking these safety measures, you can lessen the dangers of using asbestos in your chimney.

Is it possible to use an asbestos pipe for the chimney

There is a perfectly good reason to wonder if an asbestos pipe can be used to build a chimney—it is the least expensive material. There are a lot of extremely positive and critically negative user reviews available. As usual, truth lies somewhere in the center.

Now is the right time for reclamation and irrigation, and the pipes from Asbestosenta meant for this purpose still remained. They started actively using their construction boom on chimneys because of the low prices. However, the pipe isn’t meant for this kind of heat and can’t tolerate temperatures above 300 degrees. Furthermore, the interior surface of the object has a rough texture and readily absorbs soot and smoke gas condensation.

As firewood evaporates, moisture is actively combined with different gaseous oxides to form combustion products. Because of this, chemically active liquids rather than just plain water precipitate against the pipe walls. In response, they encircle solid smoke particles, creating soot and resins. As a result, a raid quickly builds up on the inside surfaces, lowering the pipe’s cross section. Furthermore, a raid of this kind has the potential to ignite, and the temperature simultaneously reaches 1100 degrees. Since this heating can withstand distances from any material, a large, challenging fire results.

When chimneys from asbestos pipe are used

Most often, asbestos pipes are used as a temporary solution for the chimney. In this case, they cannot be used directly at the furnace. Part of a solid -fuel chimney of brick or metal adjacent to the furnace, serves not only for the removal of combustion products, but also for heat transfer, increasing the efficiency of thermal unit. The temperature of the output gases there can significantly exceed the permissible limit of 300 o C. And only after passing through the channels of the convective zone and raising to the level of overlapping with the attic, the outgoing gases are cooled to safe 200–250 degrees. There you can increase the chimney with an asbestos pipe, which costs many times cheaper than brick or any other.

However, most modern thermal units, especially working on natural gas, have high efficiency, which indicates the rational use of thermal energy. This applies to gas columns, boilers and pyrolysis stoves, at the output of which the gas temperature does not exceed 250 o C. Naturally, with such thermal devices it is quite logical to use inexpensive asbestos pipes. Only the increased ability of the flue channels to form condensate can become an obstacle. Devices for collecting it only partially solve the problem, so the accelerated formation of soot here is inevitable. It is possible to fix the situation only by regular purification of the chimney, which in the heating season is extremely inconvenient.

The inability to install viewing windows in asbestos pipes is another issue. Because of this, these chimneys can only be installed in direct areas.

After a summary of the previous points, we list the following situations that prohibit using asbestos pipes for chimneys:

  1. High probability of destruction at a temperature of more than 300 o C.
  2. Fire danger due to cracking the walls of the chimney with the output of combustion products.
  3. Reducing the strength of traction in the chimney due to the lack of its supporting heat capacity.
  4. Accumulation of condensate on walls with increased soot formation.
  5. Lack of the possibility of arranging revision hatches in asbestos pipes.
  6. The requirement to install such products only in an upright position.
  7. The need for regular audit and purification of the chimney from soot.

When installing a chimney, asbestos pipes should only be used as inter-story protective sleeves.

The circumstances of the use of asbestos pipes

Nonetheless, this material is still being used. And the reason for this is that it is inexpensive and only occurs when the chimney’s temperature is between 200 and 250 degrees Celsius. These kinds of circumstances are typical of how gas heat units work. It’s also crucial to note that, in contrast to burning firewood, the combination of gas fuels forms solid, non-combustible particles more slowly. Pyrolysis solid fuel stoves also have an inherent temperature range for their flue gases, but they are distinguished by the production of a significant amount of condensate, which is lethal for asbestos pipes.

The following conditions need to be considered when installing asbestos pipes on the chimney:

  1. When arranging an independent smoke system, asbestos pipes are used only when installed through transitional cartridges between the firebox and the chimney.
  2. When installing a chimney on the outer side of the house for installation, special sleeves and adapters from the same material are used.
  3. Such products are also used to extend the acting chimney with insufficient thrust in the furnace.
  4. The asbestos -cement pipe can be used as a sleeve for the current brick chimney, if brickwork begins to collapse. The same guil use can be used in the construction of a brick chimney.
  5. The installation of asbestos pipes is carried out exclusively on brick masonry or reinforced concrete base.
  6. The chimney through the overlap is possible only when using a fluff.
  7. At the intersection of the chimney, the device is mandatory.
  8. Pipe junction is carried out only by high -quality couplings with a gasket for carving asbestos cord as a seal.
  9. Insulation of asbestos chimney is required. It is carried out by covering the pipe with basalt wool and a galvanized metal casing. It can be pulled off with wire or strip screeds of a special structure.

Video: what happens in the explosion of an asbestos pipe of the chimney

The size of the chimney from asbestos

The following factors should serve as a guide when selecting asbestos pipes for a chimney:

  1. The use of this material is possible only for gas boilers and pyrolysis heating units, which are characterized by a reduced temperature of smoke gases. It should be borne in mind that the smoke of pyrolysis furnaces is oversaturated with products that contribute to the formation of condensate, and therefore soot.
  2. The diameter of the asbestos pipe of the chimney should not be less than the output pipe of the heat unit.
  3. The total length of the chimney should be at least 5 meters, while the excess above the roof ridge is at least 0.5 meters.
  4. A significant excess of this indicator will also lead to undesirable consequences due to a decrease in the speed of gases in the pipe. In this case, the amount of condensation formed will increase.

The device of asbestos chimney

The following procedure is used to install the chimney:

  1. Asbestos pipe is never removed directly from the furnace, it should be based on a concrete or brick base. Summer to the heat unit is carried out through a metal adapter. This part of the chimney is equipped with a flat gate or disk shutter to adjust the thrust by reducing the passage in the chimneys.
  2. When installing a chimney in its lower part, a container for collecting condensate is provided, which must be periodically empty from the black fluid with an unpleasant odor.
  3. The upper end of the chimney is necessarily equipped with a cap, and at best – a deflector.
  4. At the junction of the chimney in the ceiling overlap, a hatch is cut out, surpassing the size of the pipe of at least 15 centimeters. Below on the ceiling, a sheet metal damper is fixed. In the formed opening on top, basalt cotton wool is tightly laid and closes with the same metal sheet on top.
  5. The intersection of the roof pie is carried out in the same way. Only outside on the roofing you need to arrange a otter – a device to prevent water from entering the pipe into a subcutaneous space. In the construction market, it is easy to purchase a finished design corresponding to the size of the pipe and a roof tilt.

It should be kept in mind that furnaces with extremely high heating temperatures make it impossible to use chimneys made of asbestos pipe for bath heating.

Fire safety

The specifications for the chimney’s safe device are the same as those for other systems:

  1. It is not allowed to pass the smoke channel closer than 70 centimeters from the supporting structures of the building.
  2. Smoke pipes cannot be painted with oil or enamel paint. If necessary, you can use lime or special bitumen varnish.
  3. When passing the chimney through the wall, it must be finished with non -combustible material, and the passage itself should be recorded in the same way as the ceiling passage.

It is important to keep in mind that the industry does not manufacture asbestos-cement pipes expressly for chimneys, and the owner is ultimately responsible for their usage in the heating system.

Video: consequences of improper use of asbestos chimney

Every month, the chimney needs to be inspected for asbestos and cleaned of soot if needed.

What’s particularly significant is that certain preventive actions meant to stop planting are categorically not advised for chimneys made of asbestos pipe on solid-fuel furnaces. Even in pyrolysis furnaces, burning soot in a chimney with high-temperature fuel (aspen) or a nut shell is not feasible.

You must use potato peels, stone salt, or a blue mixture that causes the soil layer to be chemically destroyed for this purpose.

Insulation of asbestos chimney

The goal of asbestos-filled chimney insulation is to raise the temperature of the exhaust gases in order to lower the amount of eminent condensate. Since asbestos pipes collapse at temperatures above 300 degrees, the potential applications of this technique are limited.

  1. The outer part of the pipe is insulated with mineral or basalt cotton wool, on top of which a galvanized steel casing is arranged. The advantage of this method compared to a brick otter is a large difference in the weight of the structures.
  2. The internal parts are insulated in the same way, the construction of the protective shell is not necessary here.

When selecting asbestos pipes for use in chimneys, safety and usability must be carefully taken into account. Due to its heat-resistant qualities, asbestos was once a common material, but it is now well known that breathing in its fibers can be harmful to one’s health. Although many countries discourage the use of asbestos pipes in new installations due to health and environmental concerns, asbestos pipes can still be found in older buildings.

It is crucial to be aware of the hazards if you plan to use asbestos pipes for your chimney. Inhaling asbestos fibers can be extremely dangerous if they are released into the air due to pipe damage or deterioration. This includes the possible emergence of potentially fatal lung conditions like asbestosis and mesothelioma. As a result, any asbestos pipes that are currently in place should be carefully maintained or replaced with safer options.

Generally speaking, it is advised to use contemporary, asbestos-free materials when installing or replacing chimney pipes. High-temperature plastics, ceramics, and stainless steel provide similar heat resistance without the health risks of asbestos. These materials offer a safer and more effective solution for your chimney needs because they are also more resilient and require less upkeep.

In the end, asbestos pipes should not be used in new projects because of health risks, even though they might still be present in older chimney installations. In addition to ensuring compliance with current regulations, prioritizing safety and selecting contemporary, asbestos-free materials also protects the health of those residing or working in the building. You can keep your chimney system secure and operating for many years to come by being aware of the risks and making well-informed decisions.

Of course! This is a preliminary version of your article’s main thesis statement: The viability and appropriate techniques for using asbestos pipes for chimneys are examined in this article. Even though asbestos was once widely used, it poses health risks when disturbed and needs to be handled and maintained carefully. We go over safe installation procedures, including rules, substitutes, and things to think about for contractors and homeowners who want to replace or use asbestos chimney pipes in a safe and efficient manner. Do you think this draft needs to be adjusted in any way?

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Alexandra Fedorova

Journalist, author of articles on construction and repair. I will help you understand the complex issues related to the choice and installation of the roof.

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