Varieties and what are they? + Photos and Videos

Varieties and what are they? + Photos and Videos Small diameter plastic pipes. In order to conduct clean water and drain sewage, they most often opt for plastic pipes. But when choosing them, it is worth knowing some of the features of these products, one of which is the diameter.

If you know the scope of these or those pipes, you can always select materials for your home.

General information


In order to make plastic pipes, thermoplastic polymers are used.

Pipes are manufactured according to all standard ones, and for this reason all products have the same characteristics:

  • According to GOST, the melting point of the material is +149 degrees.
  • The tensile strength of plastic is measured in newtons and has a value of 35 N / mm 2 .
  • This material has a coefficient of linear expansion of 0.15 mm / m o C.

These items may vary in size, but we are not talking about length.

Let's separate out plastic pipes of small diameter. For example, a pipe with a diameter of 0.3 cm is used to manufacture laboratory equipment. For the water supply or sewerage system of a private house, pipes with a diameter of more than 5 cm are used.


Yes, this is one of the main characteristics.

When choosing a product, it is worth considering that they have an inner and outer diametrical section. But let's note that the domestic manufacturer takes the outer diameter as the main parameter. If you need to create a sewerage system or water supply, you should buy small diameter plastic pipes. In this case, the minimum value is 1.6 cm, and the maximum is 5 cm.

If we are talking about creating a pipeline for carrying drinking water, you need to use pipes only with a large diameter.

Varieties by field of application

There are three types of polypropylene pipes, but they are quite enough to completely replace metal products. The model P N10 features thin walls, but they have been used to create water supply systems for more than 50 years. They can be used to conduct both hot and cold water. In addition, they can be used to create a warm floor.

Varieties and what are they? + Photos and Videos Pipes made of materials such as polyvinyl chloride can also be used to equip storm sewers. In this case, the outer diameter of the products will be from 2 to 11 cm, and the inner diameter is 1. 6 and 9 cm, respectively.

Models of products marked Р N20 are designed to be used for approximately 25 years. In this case, the wall thickness of the product is 1.

8 cm. Note that the outer diameter of the pipes is similar to the previous model described, but inside they will be slightly smaller. Thanks to this indicator, they can be used at an internal pressure of 2 MPa.

They can also be used to install a heating system.All this is available due to the fact that the material is resistant to high temperatures.

Products keep their properties even at a temperature of 93 degrees! We also note that products marked Р N10 can be used in cases where the temperature will not be higher than 45 degrees.

And the last type, Р N25 differs from the two previous types in that additional reinforcement is carried out by means of fiberglass. The term of use largely depends on the pressure, as well as on the temperature threshold of the liquid.

They have the following characteristics:

  • They can withstand pressure no more than 2.6 MPa.

  • The outer diameter of the product can be from 2.1 to 8 cm.
  • The inner section can be from 1.3 to 5 cm.
  • In the thinnest pipe, the wall thickness is 0.

    4 cm, and in the largest one - 1.3 cm.

The price of such plastic products is determined precisely by these characteristics. When choosing pipes in order to create a water supply system, diameter plays a huge role, since it is this characteristic that indicates the throughput. Small diameter plastic gas pipes are very thin, as large volumes are not required.

Description of polyvinyl chloride

Varieties and what are they? + Photos and Videos Pipes made of this material are of low cost if compare them with their iron counterparts. Transparent pipes are often used. I can use them to create laboratory equipment and ventilation communications.

Note that they cannot be used if the temperature is over 100 degrees. This is due to the fact that the material is capable of emitting hydrogen chloride at high temperatures, and it is harmful to the health of others.

Another interesting fact is that PVC is distinguished by its natural smoothness and ability to repel dirt. The pipes, which are made of transparent material, can be installed almost anywhere, as they have excellent flexibility.

Advantages and disadvantages

The advantages of plastic pipes include:

  1. Service life, since they can be used for over 50 years.
  2. Small size and light weight, which makes the pipes easy to transport and load for transportation.
  3. Ease of installation, as even a person who has no experience in pipe laying can lay transparent PVC pipes.

  4. Low noise level during operation, due to which there will be almost no noise during the operation of the system.
  5. Safety and environmental friendliness, because the described product is completely safe for human health, because it does not emit vapors and does not interact with aggressive chemicals.
  6. Low level of thermal conductivity.
  7. Ease of service. Due to the transparent walls of the pipes, they are easy to inspect, and it will not be difficult to clean them if necessary.

All small diameter plastic pipes are not suitable for industrial use, and this is a minus.

Stages of creating PVC pipes of small diameter

In order to create products from polyvinyl chloride, two main methods are used - casting and extrusion. The second method is to heat the plastic and push it through a special ring-shaped hole.

If we are talking about the casting method, the creation of the pipe can be divided into several stages:

  1. First, the plastic is poured into a standard mold on a centrifuge.
  2. Then the centrifuge is turned on.

    When the device starts to work, the material is distributed along the walls of the mold, and most importantly, the layer is uniform.

  3. When the material cools down, transparent tubes are obtained.

Note that the use of transparent pipes for the pipeline is not advised, as there are more suitable samples.

Features of PVC pipes

The described type of pipes is most often used in order to create non-pressure systems. They can be used to transport various substances and drinking water.

They have the following features:

  1. No special tools are required for installation. The connection is made by cold welding. The pipes can also be connected using rubber cuffs.
  2. Pipes of this type are considered rigid and special fittings are used for their connection, as well as for the use of metal products. For this reason, when creating a system project, professionals take calculations as for steel products.

  3. Polyvinyl chloride products make it possible to make both external and internal laying of communications. At the same time, when making an external system, you do not have to worry about the appearance.
  4. PVC products are cheaper. For example, plastic square pipes are often used to make ventilation systems, and in this case they are no worse than galvanized or metal products.

Polypropylene single-layer pipes

In hardware stores you can find different diameters of plastic pipes, and you can find single-layer and multi-layer products.

Pipes of the first type differ in that there is nothing in their composition except for the main component - polypropylene.

They are divided into several types:

  • PPH tubes differ in that they can be used over a wide temperature range, but at the same time, they do not tolerate low temperatures well. They also have a high level of resistance to aggressive substances. They are often used to transport liquids for technical purposes. Due to their thin walls, they are often used to create ventilation systems.

  • PPV species has a high level of resistance to low temperatures and special flexibility. It is also important to note such a feature as high thermal expansion.
  • РР R tubes are universal and can be used for any temperature regime, while they are quite durable. Note that they can retain their original shape under different conditions. In addition, they are environmentally friendly and therefore are often used to transport drinking water.

Multilayer pipes and their features

When creating this type of pipes, foil is glued onto thick-walled tubes from above, and then covered with a protective layer of polypropylene. These layers are perfectly connected to each other using holes in the foil. Most often, such pipes are 4 meters long. The outer diameter ranges from 1.6 to 12.

5 cm. For completing, you can buy fittings, a plastic box and other parts. Connect all elements of the system using specialized equipment. If you wish, you can purchase fittings with a threaded inside, and then the connection to the water supply will be simplified.

Still rigid plastic pipes of small diameter can be used to transport cold and hot water, as well as as elements for the heating system.

In addition, they are used to create a technological pipeline of any kind.

Polyethylene products

Pipes of this type are able to withstand temperatures not lower than -20 degrees. Note that models with a diameter of up to 6.3 cm can be connected using fittings made of polypropylene and brass. Larger pipes are butt-welded.

Polyethylene pipes can be used for work with high pressure and in its absence. They are also often used to create internal sewerage systems, which are considered free-flow.

Metal-polymer pipes

Inside such products there is an aluminum layer of foil, which reduces the coefficient of expansion. The main advantage is that the shape of the pipe remains unchanged when bent. Most often, the installation of these pipes is made hidden.

Note that the cost of metal-polymer pipes is high, but this is justified by the fact that they are of high quality and resistant to expansion.


Whichever type you choose, thanks to them you will be able to create a water supply system that can subsequently be used for more than a dozen years. But when choosing, try to choose the desired type of pipes and install in accordance with all the rules.