Polyethylene pipes for heating: introduction and application features. Polyethylene pipes for heating Cross-linked polyethylene pipes for heating

Is a polyethylene pipe suitable for heating? We will get acquainted with a relatively little-known material - cross-linked polyethylene, we will analyze its features and the methods of installation used.

But first, some general information.

About polyethylene

What do we know about this material? Well, it's transparent ... and it seems to be made into bags. This is where the list of well-known information seems to end.

Let's try to expand it.

Polyethylene for over a century... It was first discovered by accident by the engineer Hans von Pechmann in 1899 and was immediately forgotten.
In 1933, the material received a second life in the form of insulation for a telephone cable.
The material is dielectric, elastic (and retains elasticity at temperatures below zero) and very chemically resistant. Concentrated sulfuric acid can be stored in a polyethylene can for an unlimited time.
Polyethylene does not absorb water and does not let it through, representing a reliable waterproofing.
Tensile strength is large enough so that pressure pipes of cold water supply are made of polyethylene.

Benefit: The physical properties of polyethylene, including density and strength, differ depending on the polymerization conditions.
Moreover, the lower the pressure during the reaction, the stronger the resulting material. Distinguish between low, medium and high density polyethylene.

All types of polyethylene soften at 80-120C... Taking into account the fact that the pipe will be under pressure in the water supply system, manufacturers limit the operating mode of polyethylene pipes to a maximum temperature of ... 40 degrees.

Hence - an unambiguous and final verdict: polyethylene pipes are not suitable for heating. Point.

Useful modification

In its normal state, polyethylene consists of long monomolecular chains. However, there are a number of operations that can change its structure.

Due to heating in the presence of a catalyst, bombardment with electron beams, or simple immersion in water with a catalyst and special additives, molecules begin to form not only longitudinal but also transverse connections. Staple. The result is a fundamentally different material, which is commonly called cross-linked polyethylene (PE-C, or PE-X).

To understand how its properties have changed, we will give a description of a cross-linked polyethylene pipe for heating, manufactured in Germany under the Gabo Systemtechnik brand.

The pipe is capable of working for the declared 50 years in the 90C / 7 bar or 70C / 11 bar mode.
The maximum operating temperature for it is 95C - the same as manufacturers usually indicate for reinforced polypropylene.
The pipe remains extremely flexible. The minimum bending radius is only 6 of its diameters. From a practical point of view, this means that when you install your own XLPE heating, you can get by with a minimum number of relatively expensive fittings.

Thus, cross-linked polyethylene is suitable for heating systems without any reservations: according to the current SNiP, the temperature (see) in the internal engineering networks of residential buildings should not exceed those same 95C, which the pipe, as we just found out, will perfectly withstand.

Production

Technology

As an example of production technology, let's take information from the website of the dealer of those same Gabo pipes.

The Germans are traditionally famous for their pedantry and in terms of compliance with technological standards, they are certainly ahead of the rest.

High-density polyethylene in the form of granules is melted and pushed through the annular hole of an extruder - a special press that forms a pipe of the required section.
During the extrusion process, the material homogeneity is continuously monitored.
The pipe intended for warm floors also gets an oxygen barrier - the pipe is covered with a film of quick-drying ethylene vinyl alcohol.

Useful: all pipes for transporting drinking water are mixed with additives that make it opaque, including for ultraviolet radiation, even during the extrusion process.

Finally, the finished pipe is crosslinked. The most technologically advanced and cheapest production methods are with the use of reagents; electron beam irradiation is slower and more expensive.

The method used is not directly named: the seller's website vaguely states that "irradiation with fast electrons is the most environmentally friendly." From this we draw a cynical conclusion that, most likely, the Germans, like many other manufacturers, use a reaction with a silane and a catalyst.

The finished pipe is delivered to dealers in 200-meter coils. The retail price for a meter of a 16 mm pipe is about 50 rubles.

Regulations

Pipes made of cross-linked polyethylene fully comply with GOST 52134-2003 "Pressure pipes made of thermoplastics and their connecting parts".

What interesting things can we find in the text of this document?

In addition to the material (PE-X), the marking must indicate the stitching method. Certainly, it is not difficult to bring the Germans out to clean water - it is enough to study the pipe.
In addition, the marking of all thermoplastic pipes includes an indication of the outside diameter, wall thickness and maximum working pressure.

The standard provides a table of pipe sizes. In the XLPE column, we find a range of dimensions from 10 millimeters outside diameter with a wall thickness of 1.3 mm to 250 millimeters with walls as much as 3.4 centimeters thick.

Deviations from the specified dimensions in the average outer diameter are permissible only upwards and depend on the nominal size: for a diameter of 10 mm, a deviation of 0.3 mm is permissible, for 250 - of 2.3 mm.

The wall thickness can also only be exceeded. Downward deviations are unacceptable. The range of deviation values from 0.4 mm for the thinnest pipes to 3.7 for the thickest.

Application features

We have already found out that XLPE is suitable for heating. Where and how best to apply it?

The ideal option is to lay the pipe as a warm floor. The combination of good thermal conductivity and low coefficient of thermal expansion makes polyethylene pipes more than suitable. The opportunity to purchase a continuous pipe up to 200 meters long will also come in handy.

The instruction, in general, differs little from laying any other water-heated floor:

The pipe is laid out on the rough floor with a spiral or snake and recessed into the screed.
All connections are above the floor. The reason is clear: one-piece pipes rarely leak. 9 out of 10 leaks are at connections, and it would be better for them to be accessible.
The first start of heating (see) occurs only a month after the screed is laid, when the concrete gains strength. Warming it up earlier, you will not speed up drying, but cause it to crack.

It is clear that for a warm floor, the maximum operating temperature of cross-linked polyethylene is clearly excessive. Temperatures above 40C will already feel uncomfortably high. Typically, the temperature of the coolant in the pipes of the underfloor heating does not exceed 30 degrees.

How are XLPE heating pipes connected to brass and plastic fittings?

You will need special equipment. At least - an extender, scissors for cutting are also useful.

The principle of connection uses the molecular memory of the material: the pipe can change its linear dimensions for some time, but will quickly return to its original dimensions.

The pipe is cut to size.
A retainer ring is put on it. It should protrude a millimeter beyond the edge of the pipe.
The extender head is inserted into the pipe and in several movements with a twist between them stretches the pipe, plunging further and further until the head is completely inside it.
Then the extender is quickly removed, and the stretched pipe is put on the fitting, where it returns to its original diameter and securely encloses it.

Tip: Applying graphite grease will reduce tensile force and extend tool life.

Conclusion

You can learn more about this type of pipe by watching the video at the end of the article. Successful renovation!

Today, an established heating system is, first of all, a guarantee that the house or apartment will always be cozy and comfortable for all household members, even in the most severe frosts. And fortunately, the use of modern materials and technologies allows you to achieve the longest and most productive work of any heating system. At the same time, responsibility for the direct connection between all elements and communications lies on the pipes, on the choice of which the serviceability and service life of the heating equipment depends.

Recently, the use of polyethylene pipes has become a very popular solution for arranging water supply and heating systems. They have a lot of advantages in comparison with other analogues on the market, but at the same time, certain technical features should certainly be taken into account before proceeding with their direct operation. That is why this article will be devoted to these important issues.

Features of polyethylene pipes

First of all, it should be noted that pipes made of ordinary polyethylene, which are designated by the PE symbols, are intended for water supply and sewerage systems, including drinking water. This is due to the following features of pipes made of similar material:

Due to the incompatibility of this type of pipes with high temperatures, scientific and technological progress did not stand still and contributed to the design of special pipes made of cross-linked polyethylene, which are usually denoted by the abbreviation PEX. It is they who are intended for various heating and hot water supply systems, the coolant temperature of which is does not exceed 90 degrees.

XLPE pipes for heating

In order to obtain a more durable polyethylene, this material was subjected to a special treatment under high pressure conditions, as a result of which the molecules formed even stronger bonds among themselves in the form of transverse lines. The so-called Stitching can be done in several ways, namely:

by irradiation with electrons of polyethylene in the environment electromagnetic fields;
using polyethylene processing peroxides;
through the use silane gas;
by processing polyethylene nitrogen compounds.

The aforementioned technological processes contributed to a significant increase in the strength and thermal stability of PEX pipes, which allows them to be used as an element individual and central heating, hot and cold water supply, radiator and panel heating systems, as well as for "warm floor" and "snow melting" systems. Pipes made with peroxides are considered to be of the highest quality.

XLPE pipes are used subject to certain parameters, namely:

maximum continuous operating temperature should not exceed 90 degrees, but in force majeure, the pipes are able to withstand a temperature of 100 degrees for some time;
maximum permissible operating pressure in the system should not exceed 10 bar at a temperature of 90 degrees and 25 bar at a temperature of 0 to 25 degrees.

A feature and at the same time a lack of material from which this type of pipe is made is high oxygen permeability, which leads to the impossibility of using them in closed heating systems in their pure form. That is why they are covered with a special protective layer of polyvinylethylene or reinforced with a layer of aluminum foil.

The connection of XLPE pipes is carried out using fittings, which can be made from various materials, namely polymer, brass and bronze. The highest quality and tested are polymer fittings, which have shown themselves at their best for many years. The algorithm for connecting such pipes can be described as follows:

the end of the connecting pipe is extended flaring tool, in order to give it a larger diameter;
then this hole is placed fitting fitting;
in order to increase strength, the tension sleeve is attached to the pipe using press.

This technology makes it possible to significantly increase the service life and reliability of such connections, which in terms of quality fully correspond to the long service life of the XLPE pipes themselves.

For private houses, people prefer to use polypropylene pipes:

Advantages and disadvantages of polyethylene pipes

They have many advantages that distinguish them from other types of pipes intended for heating systems, but at the same time and some significant disadvantages, the study of which is mandatory when choosing them. So, to the primary positive aspects of exploitation PEX pipes can be attributed:

Despite the many positive characteristics, the disadvantages of PEX pipes in heating systems also take place. It should be noted that in the case of using brass fittings, direct contact with various materials for plaster and screed must be limited, since this will lead to corrosion and correspondingly poor functioning of the system... The disadvantage can also be called vulnerability to ultraviolet rays, which leads to the need to use them in closed communications.

When choosing pipes made of cross-linked polyethylene, it is necessary, first of all, to compare the technical parameters of this heating element with the characteristics of the living space where they will potentially function. If characteristics such as pressure and temperature of the existing heating system exceed the threshold values of PEX pipes, it is better to refuse to use them. But, as practice shows, such cases are extremely rare. Therefore, based on the foregoing, it is safe to say that PEX polyethylene pipes fully comply with modern conditions, which are put forward by heating systems operating in the vastness of our country.

In order to determine the choice of pipes for heating and not be mistaken, it is recommended to read this article:

How polyethylene PEX pipes are made

Reinforced plastic and, of course, polyethylene, which will be discussed in this article.

Uponor XLPE pipes + Danfoss ball valves.

Polyethylene pipes for heating are made of cross-linked polyethylene PE-C (PE-X, stands for Cross-linked polyethylene, where PE is PolyEthylene, X is Cross-linked) ).

Leads to floor-standing radiators.

Advantages of PE PEX pipes

The operating temperature of the coolant is up to + 95 ° С (for a short time up to + 110 ° С).
Durability. Service life of 50 years or more.
Mechanical strength. The high molecular memory of the material allows it to recover its shape after deformation.
Corrosion resistant. Deposits and sludge do not form on the inner walls, which distinguishes them favorably from their metal counterparts, which periodically need to be washed and cleaned. The cost of such work can exceed the cost of new pex pipes by several times.
High hydraulic characteristics, which are ensured by the smoothness of the inner walls of the PEX pipes. Due to the fact that no deposits form on the inner walls, there is always good hydraulics in the heating system. Formation of a smooth surface (roughness coefficient of about 0.0005 mm) is ensured by a special Teflon coating of the extruder.
Resistant to harmful bacteria.
Not damaged by freezing water.
Light weight (1 m 16 mm pipe weighs about 90 grams).
Low oxygen permeability (0.02 gr. Per 1 m³ / day). PEX XLPE pipes are covered with an ethylene vinyl alcohol protective film that prevents oxygen from entering the pipe.

Uponor at the construction site prior to installation.

Note! Almost complete oxygen tightness is ensured when the pipe is reinforced with a layer of aluminum foil (PE-X-AL-PE-X, PE-X-AL-PP, PE-X-AL-PE). The only drawback of such a pipe is its inability to recover from mechanical stress. The crosslinked polyethylene reinforcement technology was developed by Kitetechnology B.V. (UK) in 1979.

Resistant to hydro shocks.
Ease of installation.

Pipes made of Uponor XLPE on sound-absorbing material "Thermozvukoizol" + tee and Uponor rings.

disadvantages

High price. The price of the pipe REHAU Rautitan Pink 16 mm x 2.2 is about 75 rubles / m. The price of VALTEC PEX-EVOH 16 mm is 59 rubles / m.

Note! PEX XLPE pipes are UV-resistant, therefore a protective cover is recommended for outdoor use.

Evolution Uponor Q&E.

History

The technology of "crosslinking" polyethylene was developed by the Swedish chemist Thomas Engel in 1968. However, the scientist believed that his invention could not compete with more modern products and sold the patent for the invention. In 1972, the WIRSBO company (Sweden) began industrial production of PEX pipes and still occupies one of the leading positions in the market.

Uponor Radi Pipe 40 × 5.5 EN ISO 15875.

Expansion tool Uponor Q&E REMS Power Ex Press, 1063701. Expansion head for 40x5.5mm pipe included. Made in France.

Production

"Stitching" is the process of joining molecules into a three-dimensional network through the formation of crosslinks. During crosslinking, some hydrogen atoms are detached from polyethylene molecules, which are composed of hydrogen and carbon atoms. As a result of this, a free bond is formed, which is used to connect the links of the molecules to each other.

Uponor Aqua 25 x 3.5; 20 × 2.8.

There are 4 ways to produce XLPE:

Peroxide (PE-Xa) - heating of polyethylene in the presence of peroxides. This is the slowest production method, but at the same time the highest quality. It is characterized by a high degree of crosslinking of carbon atoms, on average about 82%.
Silane (PE-Xb) - material treatment with moisture containing silane and catalyst. The degree of crosslinking is about 65%.
Electronic (PE-Xc) - processing of the material with electrons. The degree of crosslinking is about 60%.
Nitrogen (PE-Xd) - the most rarely used method.

Note! The degree of crosslinking affects the molecular memory, density and elasticity of the tube.

Polyethylene pipes for heating are sold in coils of 100 and 200 m, this allows the installation of large areas without the use of additional fittings.

Cordless expansion tool Milwaukee C12 PXP-I10202C.

Milwaukee C12 PXP-I10202C.

Milwaukee C12 PXP-I10202C Kit.

Expander Case Milwaukee C12 PXP-I10202C.

Installation of XLPE pipes

Unlike the installation of metal pipes, which requires special knowledge and skills (welding, soldering ...), without which it will not be possible to do the job efficiently, such skills are not required when installing sewn polyethylene pipes. All that is needed is a set of tools and strict adherence to a predetermined plan.

Uponor Q&E Manual Expansion Tool S 5+ S 3.2. Article 1004064.

The following tools are required for installation:

Expander (expander);
Various nozzles for expander: nozzle for expanding a polyethylene pipe; nozzle for connecting pipes to radiators;
Press;
Press attachments;
Lubricant and brush for cleaning the tool;
Pipe cutter.

Note! The joint obtained in this way is very reliable and even stronger than the pipe itself.

Video

The appearance on the market of polymer pipes was a happy deliverance from an eternal leak. At first, many were skeptical about the new product, but soon the ranks of skeptics thinned significantly.

At the moment, few people, having conceived the laying of communication networks for private estates, are interested in steel pipes, since in fact polymers turned out to be incommensurably more practical in operation and convenient in installation. But now the already extremely popular polypropylene pipes have been replaced by polyethylene pipes for heating - one of the relatively recent innovations in thermal communications.

And again, healthy skepticism sounds in the discussion of the novelty. After all, mankind has been familiar with polyethylene for more than a century, during which it has become truly irreplaceable. But everyone knows that this material is not suitable for use in heating systems. Although, under normal circumstances, polyethylene melts at temperatures from 80 ° C, the pressure in the pipe reduces this figure to 40 ° C, which is completely unacceptable for heating networks. However, new skeptics should take into account that many new discoveries have been made in the polymer industry over the past century, therefore pipe polyethylene is significantly superior in characteristics to household counterparts.

Wide range of.

Polyethylene for heating systems

The maximum operating temperature for polypropylene components for heating networks is 95 ° C required by the relevant standards. It is clear that it would be difficult for ordinary polyethylene to compete in this indicator with reinforced polypropylene. However, this is not required, since a completely different modification of polyethylene material is used in heating systems, known as cross-linked. It sounds frivolous, evoking the idea of making innovative pipes for heating in a sewing workshop. In fact, a household term means a complex technological process.

Each student is given a general idea of the polyethylene production by a chemistry course. A popular polymer is formed by monomolecular chains stretching to the required length. Modern technologies make it possible to achieve the formation of crosslinks between molecules in addition to longitudinal ones. This happens with the participation of a catalyst due to bombardment with electron beams, heating or immersion in a liquid. The result is a polymer material with fundamentally different properties, used in the production of polyethylene pipes for heating and known in the original as PE-X, and in Russia called PE-S.

The result of the development at the moment has become a material resistant to aggressive influences, retaining its properties in a wide temperature range, with the following characteristics:

high plasticity;
mechanical and chemical resistance;
low oxygen permeability;
resistance at temperatures from 110 ° С frost to 110 ° С above zero;
working temperature maximum 95 ° C above zero;
softening temperature 132 ° C above zero;
operating pressure 90 ° C / 7 bar or 70 ° C / 11 bar.

The smooth polyethylene surface from the inside helps to keep the cross section unchanged throughout the entire service life, which for use in heating systems is 50 years. In order to avoid the development of corrosion processes on the metal components of the heating network, pipe polyethylene is produced with a protective layer that ensures a minimum of oxygen penetration into the interior. For heating networks, products are manufactured from two layers of cross-linked polyethylene, separated by an aluminum layer that reduces thermal elongation, to eliminate deformation.

The use of polyethylene pipes

In general, the technology of polymer crosslinking has been widely used for three decades, but polyethylene pipes for heating began to be used only in warm floors. The flexible tubes produced in two-hundred-meter coils are extremely convenient in installation, since their considerable length allows avoiding unnecessary joints, which are considered a weak point of any communications. To seal the joints, unified plastic and brass fittings are produced, which ensure the simplest installation. The use of long polyethylene pipes makes it possible to lead the connections above the floor level for easy access when needed.

When installing underfloor heating, it is advisable to use products with an anti-diffusion coating that prevents oxygen access. It is inappropriate to use more expensive multilayer polyethylene pipes in this situation, since the temperature of the coolant is relatively low and the deformation is insignificant. But in heating networks operating in a higher temperature regime, one cannot do without multilayer products with a low elongation coefficient. Only open-type heating systems involve the use of polyethylene pipes, devoid of an anti-diffusion barrier, since oxygen penetrates inside in any case.

Mounting Features

The clear advantages of polyethylene products include elasticity, which allows them to bend at almost any angle. Cold cross-linked polyethylene retains its bend only when secured with special devices, but the heated material is easily fixed in the desired position. The pipe should be heated carefully to avoid a decrease in anti-diffusion properties. After fixing the required bend, it must be cooled before use. A heating system with polyethylene wiring is mounted without using corner fittings, therefore it turns out to be much more reliable by reducing the risk of depressurization.

The memory effect is another advantage of polyethylene pipes for heating. They are not afraid of kinking, since the flow of hot air is able to quickly restore its original shape. Molecular memory of XLPE is also used to connect to fittings using an extender, which pulls on the hole to fit over the fitting, to which the pipe fits snugly, returning to its natural diameter. Welding during the installation of heating networks made of polyethylene pipes is used quite rarely, although with regard to the tightness of the heating system, it is more preferable, since it provides molecular bonds in the joints.

However, when carrying out installation work, you will have to take into account the disadvantages of polyethylene products. One of them is the notorious thermal deformation, which can not be considered a disadvantage when placing pipes open, when the elongation from heating, only partially compensated by bends, does not encounter obstacles during displacement. But a polyethylene pipeline sewn into a concrete screed turns out to be devoid of the possibility of displacement, if it is not placed in a protective casing of a larger diameter. An alternative to the casing can be used for heating pipes with an aluminum layer placed under the concrete. Otherwise, accidents are likely.

But multilayer products are quite expensive, as well as polyethylene pipes for heating in general, including accessories for their installation, in comparison with other polymer analogs. This is definitely a minus. However, focusing on the parameters declared by the manufacturers and user reviews, it is worth recognizing that the high price in this case is quite consistent with the class of products. A well-installed heating network with polyethylene wiring, judging by the test results, is really capable of serving half a century, pushing back endless leaks and related interruptions in heating into the past.

XLPE - innovative material for the manufacture of pipes. Unlike conventional PE, it can withstand high pressure, the action of chemicals, hot water.

It is used for pipelines of cold and hot water supply, heating.

Installation of PEX pipes is not difficult, but has features, knowledge of which will help to correctly perform the installation.

XLPE pipes for heating and water supply systems

New material exhibits properties of metals and polymers. Cross-linked polyethylene is a thermoplastic polymer with a three-dimensional structure.

Cross-linking technology creates intermolecular network, similar to a crystal lattice of substances in a solid state.

Thanks to this, flexibility is maintained, the melting point increases, resistance to thermal deformations, scratches and cracks. The material is designated PEX, where X stands for stitching.

Application in residential buildings

XLPE is used for pipelines external and internal engineering systems residential buildings: heating, sewerage, hot and cold water supply.

Preferred areas of application:

Warm floor.
Heating systems working with coolants at low temperatures.
Intra-apartment water supply.

Photo 1. Installation of warm water floors with red cross-linked polyethylene pipes in the room.

Heating with horizontal distribution.
Drains.

Important! Molecularly modified polyethylene is environmentally friendly and safe: it does not emit toxic substances, therefore it is used for living quarters. When burned, it decomposes into compounds harmless to humans: carbon dioxide and water.

Technical properties

Combustion temperature - 400 ° C.
Melting - starts at 200 ° C.
Average density - 940 kg / m 3.
Stretching without tearing - in the range 350-800%.
Retention of characteristics at temperature down to -50 ° C.
Thermal conductivity - 0.38 W / mK.
Flexibility.

When operating under standard conditions (coolant temperature within 75 ° C) XLPE will last about 50 years old. With constant use with extreme loads: increased pressure, 95 degree coolant the service life will be reduced to 15 years.

Sizes and diameter

PEX pipes are produced with a diameter 10-280 mm and wall thickness 1.7-29.0 mm... Supplied in coils in pieces 6, 8, 10, 12 meters each.

According to the degree of resistance to pressure, XLPE pipes are divided into the following types:

light: 0.25 MPa (2.5 atm);
medium light: 0.4 MPa (4 atm);
medium: 0.6 MPa (6 atm);
heavy: 1 MPa (10 atm).

The above pressure is nominal, the data is valid when pumping water t 20 ° C.

Advantages and disadvantages

Polyethylene crosslinked at the molecular level retains positive qualities of standard PE and gains new advantages:

The disadvantages of XLPE pipes include UV sensitivity and slow destruction by free oxygen penetrating into the structure from the air.

Attention! To eliminate unwanted contact of PEX pipes with air, use anti-diffusion protection... Handle such a coating with care so as not to scratch it during installation, transportation. Products protect from ultraviolet radiation special additives, which are included in the composition at the production stage.

Types of PEXAU pipes

Universal- are equally suitable for use in different areas: for arranging a water floor, hot and cold water supply systems, autonomous, central heating.

Photo 2. Rehau Pautitan flex universal polyethylene pipe, suitable for any type of heating.

Specialized- have a narrow scope. Designed for a certain type of pipelines, for example, only for cold water supply or individual heating.

Depending on the conditions of use, water or non-freezing liquids - antifreezes are used in the heating pipes made of cross-linked polyethylene.

In standard mode, the heating pipes operate at the limit temperature up to 95 ° C and pressure up to 10 atm... In an emergency, they withstand temperature fluctuations up to 110 ° C with a double pressure increase.

Varieties of pipes from the leading manufacturer Uponor

Uponor (Finland) produces pipes four types:

Aqua pipe- for hot and cold water supply.
Comfort Pipe Plus, Radi Pipe- for underfloor radiator heating, cooling systems.
Combi Pipe- universal.
Comfort Pipe- for underfloor heating systems.

Photo 3. Pipes made of cross-linked polyethylene Uponor Comfort Pipe, designed for underfloor heating.

Size range of products made of cross-linked polyethylene 15-110 mm... Supplied in coils 50-540 meters each, 6 meter segments.

The German company REHAU produces a large assortment of pipes of the series RAUTITAN:

FLEX- are flexible, used for cold, hot water supply, floor, radiator heating of residential premises.
STABIL- universal, have an inner aluminum layer.
HIS- universal use in temperature conditions up to 70 ° C up to 10 atm.
PINK- for underfloor heating, radiator wiring in residential, public buildings.

Connection - Slip-on sleeve fittings, size range 12-250 mm... Pipes are supplied in straight lengths 6 m each or in bays 25-125 meters.

Mounting

There are three ways to connect PEX elements:

Compression fittings- suitable for water supply (cold and hot). If necessary, the water supply system is disassembled at any time.
Press fittings- a permanent connection is obtained. The method is based on the ability of cross-linked polyethylene to recreate the shape.
Electrofusion fittings- the strongest and most reliable connection. The method requires skills in working with welding equipment.

Attention! When choosing the installation method, take into account the pressure that will be in the system. Compression fittings withstand up to 2.5 atm, press fittings - up to 6 atm, electrowelded - give a monolithic connection.

Instruments

Depending on the chosen installation method, you will need:

Electrofusion couplings- type of fitting in the form of a sleeve with built-in heating terminals.

Reference! Fittings are pipeline connecting elements used for assembly and joining, for branching, pipe turns. Main material: brass, but produced polyethylene, polyvinyl chloride, polypropylene, combined parts.

Preparatory work

Before starting the installation, ensure that the workplace is clean - at the joints dust and dirt must not penetrate.

Guided by the radiator wiring diagram, prepare the required number of fittings and pipes. XLPE is flexible, so fix the pipes to the wall using the brackets.

Check collector outputs- they must be in good condition. To avoid the formation of condensation on the "cold" system and heat loss of pipes with hot water, prepare additional thermal insulation.

Operating rules and connection to the radiator

A high-quality cut is the key to the tightness of the joint. Cut the pipe strictly at 90 °- perpendicular to the horizontal axis.
Ensure that the cut surface is completely flat- without cuts, roughness, waves.
Select only dedicated fittings for connections.- for cross-linked polyethylene.
If you need a pipe bend, first warm up the area to be bent with a construction hairdryer.
When using the electro-welded method monitor the temperature of the device. XLPE can overheat and burn.
For quality installation follow the pipe and fitting manufacturer's instructions.