Pipe bnt - subtleties of use

Non-pressure pipelines can be called the first representatives of high technology of antiquity. In ancient Rome and Egypt, viaducts were created from them. Thousands of years have passed, but non-pressure pipelines are still relevant.

For about 100 years, asbestos-cement BNT pipe has been widely used in the installation of free-flow systems in our country.

Important: The length of asbestos-cement pipelines on the entire planet is approximately three million kilometers, of which about 1 million km is located in the territory of the former USSR.

Varieties of material

Despite such an advanced age of exploitation, to this day the debate about the advisability of using this material continues. Its popularity largely determines the low price and simple technological instruction for manufacturing.

For the production of necessary Portland cement, water and natural mineral asbestos. As you can see, all components are of purely natural origin, so there is no doubt about environmental cleanliness.

The composition includes up to 90% of cement and up to 15% of asbestos fibers. In this case, cement is a binding substance, and asbestos fiber plays the role of reinforcement.

About asbestos-cement BNT products more

Initially, these products were developed for drainage systems, but subsequently the range of their use and the range has expanded significantly. For example, the technical characteristics of asbestos-cement non-pressure pipes BNT 100, according to GOST 1839-80, really allow their use more for external drainage.

But already BNT 200 and higher can be used almost everywhere.

1. Considering the advantages, attention is immediately focused on the fact that the asbestos-cement non-pressure pipe does not corrode. With the observance of the technology of laying and proper operation, such a highway can serve up to 50 years without major repairs.
2. This material is able to withstand heating up to 200? C without any deformation or cracks. And at the same time, even the cast iron can envy the cold-resistance of asbestos cement.
3. As mentioned above, these pipes were designed for drainage, so any variety of them perfectly withstands high humidity and has a sufficiently low hygroscopicity.
4. They have a low coefficient of abrasion and a smooth surface, making it ideal for sewer systems.
5. During operation, they are completely harmless.

In nature, there are no absolutely perfect materials, so there are also disadvantages here:

1. Large diameter pipes used for refuse chutes and powerful collectors have a serious mass and need lifting equipment.
2. The material although durable, but fragile. With a strong mechanical impact, the product may burst.
3. Asbestos dust is considered harmful to the respiratory tract and protective equipment must be used during installation. But at the present stage of the development of science, this problem was practically solved, the scientists developed a chrysotile cement tube, we will describe it later.

Geometric data products:

Products from chrysotile cement

Chrysotile cement free-flow pipes BNT were developed several decades ago. Actually chrysotile itself is a type of asbestos. Chrysotile white asbestos is considered, in contrast to amphibole, practically harmless.

During production and installation of pipelines there is always a lot of dust. The mineral on the amphibole basis, according to scientists, is a strong carcinogen, in other words, it is not excreted from the body, therefore, it can lead to a number of diseases.

Important: at the moment, all global manufacturers, including our state, produce asbestos-cement pipes exclusively on the basis of chrysotile. Therefore, if you find in the documentation, for example, the designation chrysotile cement pipe BNT 150, do not be alarmed by the same asbestos cement, only with higher technical and environmental characteristics.

How difficult is the installation

Immediately it should be said that the production of this type of products with their own hands in handicraft conditions is impossible. But the installation of the line with his own hands is almost no difficulty.

To do this, you do not need a welding machine or other docking equipment. You can cut the pipe with a simple hacksaw.

The pipes are joined using asbestos-cement or polyethylene couplings. Inside, the couplings are equipped with special sealing rubber rings, between the coupling and the wall of the pipe is left technological gap, which provides a safe bend to 3? during deformation.

Important: rotary corner and other related elements, until recently were made of cast iron, plastic adapters are now appearing that can be used for this type of product.

Scope of application

The legendary march of these pipelines began with agriculture. Initially, asbestos-cement lines were intended for the amelioration of agricultural land and drainage of moisture from the marshland.

Now the scope of use has expanded significantly.

• Due to the fact that chrysotile cement free-flow pipes BNT are not sensitive to eddy currents and various kinds of pickups, they are widely used for arranging underground cable and communication lines.
• Virtually any type of ventilation can be assembled from this durable material. The only place where, according to GOST 31416-2009, experts do not recommend the use of chrysotile cement air ducts, these are chimneys of coal stoves. The material does not withstand temperatures above 300? С.
• Large-diameter products are successfully used in the construction of refuse chutes in high-rise buildings., In addition, if the chrysotile cement chutes are cut into sectors 50 to 70 cm long, they make good city bins.
• By experience, we can say that chrysotile cement pipe is almost ideal for the installation of columnar or column-tape foundations in private housing construction. It is enough to dig a ditch, fill up a small pillow, fix the product from the inside and fill it with concrete. Such a foundation will stand firmly for decades.

On the video in this article, the specialist talks about the intricacies of using products.

Conclusion

We remembered only a small part of where this practical material can be used. For hundreds of years of operation, in one form or another, this type of product can be found almost everywhere, it enjoys well-deserved recognition among the people (read also the article The Pipes of the chewing iron class - features and application).