Recently, communications made of cross-linked polyethylene are gaining great popularity, since this material is relatively inexpensive and has a number of significant advantages: the optimal combination of strength and flexibility, resistance to high temperatures, chemical compounds and destruction. A decisive role in the long period of operation is played by high-quality work to fasten all the constituent elements. The assembly of such structures is a rather simple process, however, it has certain features and important points, the knowledge of which will make it possible to carry out the installation of cross-linked polyethylene pipes with your own hands without any particular difficulties.
Modern stores present to the eyes of buyers a huge selection of products designed for equipping communication systems in private houses and apartments. However, pipes of the Rehau brand occupy a leading position in this market segment. With vast experience, German suppliers have been specializing in the manufacture of high quality consumables for quite some time, which has allowed them to acquire a solid reputation.
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Features of joining products
The named manufacturer chose thermoplastic polymers with a linear molecular structure as the basis for such pipes. The only difference from the products of competing companies is the optimal elasticity of the elements, which gives the joints the required tightness. However, in order to perform a high-quality installation of Rehau pipes, the use of welding machines operating at extremely high temperatures will be required.
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The price of laying pipes Rehau (Rehau) from cross-linked polyethylene
| Name of works: | Unit rev. | Price |
| Laying Rehau pipes | point (water outlet) | from 1550 to 2440 rubles. |
* We offer a free visit of the master to evaluate the work. The customer will find out the cost "before the ruble" only at the place of work. (No other way)
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Mounting types
The connection of polyethylene pipes is carried out in three ways:
- Compression fitting. This type is the simplest and requires common tools. It finds its application in the arrangement of both hot and cold communications, and also provides the ability to quickly dismantle the structure in case of unforeseen situations.
- Press fitting. The named type of fastening allows you to obtain an integral and reliable connection when joining several pipes. In this embodiment, the emphasis is on the regenerative property of cross-linked polyethylene, which allows it to return to its original shape after pressing. The polymers included in the composition fill all gaps and ensure tight contact.
- Electrofusion fitting. The presented type is quite rare in practice due to the fact that it requires special welding machines and special skills. However, it is the most effective of all these methods.
An important point in determining the optimal type of connection is taking into account the pressure of the future communication system, since the first type of attachment can withstand up to 2.5 atm, the second - no more than 6 atm, and the third is practically unlimited.
Water supply systems
Execution order
Each type of connection has its own characteristics and a slightly different procedure:
- The crimp type provides for reliable fixation of the compression nut on the cut of the pipe, while its thread should look towards the future connection. Then it is necessary to tighten and secure the split ring in such a way that the end of the pipe is at a distance of no more than 1 mm. Next, on the fitting of the fastening device by pulling the cut of the pipe with the elements prepared on it. Finally, with wrenches, we tighten the compression nut until it fits snugly.
- In the press type, the clamping sleeve must first be securely fixed to the pipe cut. Then, using the expander, we pull the connecting pipe onto the fitting of the fitting device and hold it in this position for several minutes. Subsequently, due to the completion of the last point, the pipe segment will press itself as tightly as possible.
- The electric welding connection is carried out by fixing a special coupling on the pipe cut. Then, by means of welding equipment, the end of the inner spiral of the fitting device should be heated. As a result, the heated polyethylene ideally takes the shape of a fitting and cools, while ensuring the most tight contact.
Do-it-yourself pipe installation
The principle of joining polyethylene products differs depending on which method is used. Not only the instructions for performing the work change, but a different tool is required in most cases. Do-it-yourself installation of XLPE pipes is easiest to do using compression or press fittings.
Training
They clean the room: it is necessary to avoid the deposition of dust on the end of the pipes, since any contamination can negatively affect the quality of the connection. To avoid the appearance of condensation, it is recommended to protect communications using heat-insulating material. Common options: corrugation, special insulation in the form of a cylinder (hollow inside). Additionally, it is recommended to fix the pipes on the intended section of the wall, since they tend to change somewhat due to plasticity. For this purpose, staples are used.
Required tools and materials
To work you will need:
- pruning knife;
- spanners;
- expanders;
- roulette;
- building level.
The set of tools may vary slightly depending on the pipe joining technology used. For example, to work with compression fittings, you need to additionally prepare a press (hydraulic, manual).
Drawing and diagrams
When working with products made of cross-linked polyethylene, they draw up a project for a communication system. At home, a sketch is enough with the designation of the main parameters: the diameter of the pipes, their length, the locations of the fittings.
Work order
Compression method:
- A compression nut is placed on a XLPE pipe for heating or water supply.
- Install the split ring. Its edge should be 1 mm from the edge.
- Then the communication sections are connected, tighten the crimp nut with a wrench.
Application of the electrowelded method:
- A fitting is put on the end of the polyethylene product.
- To ensure sufficient heating intensity, a welding machine is connected to the connecting element. For this purpose, terminals are used. Under the influence of stress, the part of the product covered by the fitting will start to melt.
Press-on method:
- The pipes are joined using a clamping press sleeve. It is put on one section of the product.
- With the help of an expander, the inner diameter of the pipe is increased. Then it is pushed onto the fitting spigot.
- It is recommended to hold the product in this position for several minutes. At the end of the time, the assembly of the pipes ends, since they take their original shape. Considering that a fitting is installed at the end, the material will fit snugly against it.
Installation features
A diagram of a water supply or heating system is drawn up not only to determine the installation points of fittings, but also to calculate the material. According to the sketch, the length of the pipeline is calculated, the number of connecting elements that are planned to be mounted. Before starting work, it is necessary to arrange all sections of communications and fittings on the floor in the required sequence. This will avoid mistakes during the installation process. Do not allow distortions when joining elements.
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Polypropylene pipes.
Polypropylene pipes.
Polypropylene pipes are hygienic and safe for humans. Resistant to corrosion, pressure up to 25 atm., Temperature up to + 95 ° C. Polypropylene is not subject to rotting and contamination during operation. Its service life in the cold water supply system reaches 50 years, and in the hot water supply system - up to 25 years.
Unlike metal-plastic and metal pipes, polypropylene pipes are much quieter in operation, since they have excellent sound insulation. They are not covered with condensation due to the extremely low thermal conductivity of polypropylene. It is equal to 0.24 W / M * K. For example, for copper, this coefficient is 400 W / M * K.
