Polyethylene pipes for more than half a century are used for cold water supply systems. But the hot water was not supplied before them, since polyethylene is destroyed when heated. This disadvantage is eliminated due to the development of technologies. A method was developed for the production of stitched polyethylene (REH). According to it, the electron flow is passed through the material, as a result of which the bonds between atoms of hydrogen and carbon are destroyed, and the neighboring, previously not bound to each other, the molecule form durable molecular chains.

Such a procedure contributes to the fact that pipes for heating from stitched polyethylene are obtained by durable, resistant to high temperatures and pressure. In addition, polyethylene can be sewn to chemical methods: with hydrogen peroxide or by introducing silane into it. Depending on the method of compounding the material, the crosslinked polyethylene for heating acquires its special qualities that can be useful in various conditions of operation.

The German company Rehau releases one of the best pipes of this species, such as Flex, His, Pink and Stabil. Although the pipes for heating Pehau price is quite high, the demand for this product is not reduced. Pipes from stitched polyethylene have many advantages. These include:

All these "pluses" affect the cost of the product. But the pipes made of stitched polyethylene for heating the price of which are quite high, are still in demand.

disadvantages

The disadvantages of polyethylene pipes are a bit, and most of them are easily eliminated:


Technical indicators

Recognized that polyethylene pipes for heating specifications which correspond to high requirements, can be used for heating systems, the coolant in which has a working temperature of 90 degrees, and at times heated to 95. In case of problems for a short period of time, they will withstand water boiling point. Products are elastic, as they have a high linear expansion rate. Its coefficient is 0.12-0.14 mm / MK. It contributes to the fact that on pipes made of stitched polyethylene for heating, the reviews are always only positive.

The pressure that is kept pipes depends on the water temperature in the system.

At a temperature of ninety degrees, it should not exceed 10 bar, and at temperatures below twenty-five degrees - 25 bar. The strength of the pipes will be even higher if they are reinforced. The size of the cross section of these products is essentials significantly, which will also be varied and the cost of goods. For example, a pipe for heating crosslinked polyethylene price increases along with an increase in pipe diameter.

Installation

It is carried out with the help of special tools and auxiliary parts - fittings (with fittings) and couplings. In addition to frequently used brass, there are plastic fittings on sale. They are cheaper, but no less functional. First, couplings are put on the pipes. Then the fittings are inserted into the pipes, after which the couplings, pressing polyethylene, are put on top of the connection. It turns out hermetic I. durable design Without thread and using rubber gaskets.

This montage method is developed by Rehau. Her specialists invented expanding the pipes for heating Rehau on the ends with a special instrument - the expander (it will be needed for installation).

The order of work is such. The clutch is put on polyethylene, then expand the expander's socket. After that, the fitting is inserted into the pipe, and they put on top of the coupling. Previously advanced polyethylene quickly restores the shape, tightly compressing the fitting. As a result, the crosslinked Rehau polyethylene for heating after installation is much more reliable than the mounted systems with threaded, welded and other connections.


By choosing the goods, it is worth examining the marking caused to it. It should not be blurred, embraced when contacting your fingers. It is necessary to learn from the seller whether the product contains a layer that prevents oxygen into penetration into it. If you buy rehau heating pipes, mount them better by professional tools of the same manufacturer, which provide high quality mounting.

Stitched polyethylene tubes are used for heating, cold and hot water systems.

The main thing is to buy the goods of the famous brand and make a quality setting. Such products are not subject to corrosion. Therefore, when compliance with consumers, the rules of operation will not require emergency repair for a long time, regardless of how large the humidity of the premises or the suction of winter is.

Stitched polyethylene is one of the types of polyethylene produced by the physical and chemical method, in the process of which cross molecules. Communication created at the molecular level is very difficult to break, which makes this material very durable and high-tech.

Now the polyethylene material is becoming increasingly popular in the construction sector and is used for pipeline systems, for hydronous heating and cooling systems, for internal water pipelines, insulation high voltage electrical cables.

Also polyethylene is used for:

  • natural gas;
  • marine oil applications;
  • chemical purposes;
  • sewage transportation;
  • slag emissions.

Such technologies have been widely used in the laying of water pipes, since it is used for the manufacture of pipes, a cross-linked polyethylene is used, thanks to which they are able to bring to a house to 40% more drinking water. It is proved that they gradually become dominant technology in the matter of delivery of water to the house, so in the next few years they will become the main trend of the construction business.

Heating History in different years

With mass production in the 20th century, the water pipes made from galvanized steel, but when used, they delivered large inconvenience to the consumer. Because of the problems with intense rust, the volume of passing water significantly decreased. In the 1960s, galvanized pipes were replaced with plastic with fittings.


Now the most popular method for the transportation of water in hydraulic heating systems was the installation of polyethylene pipes.

Stitched polyethylene is best suited for recycling hot water In the house, therefore such a solution is the most optimal. Therefore, more and more often copper and galvanized pipes are replaced with polyethylene.

Benefits of stitched polyethylene

Stitched polyethylene gained popularity among consumers due to its flexibility. The pipe can be bent at a wide angle. In addition, they can work with a small radius of turns, sometimes supported by a metal bracket.

They can work from the spread of fasteners without cutting or splicing. Installation allows you to set the water supply line directly from the source using only one connection at each end.


Installation provides for minimizing all sorts of turns of the pipe, and therefore water flows under good pressure, which is very favorable for the shower, toilet and sink.

The cost of the material is quite acceptable and the price is available for almost everyone.

Pipes made of stitched polyethylene are characterized by ease of installation. Their installation is less laborious compared to copper or galvanized, since there is no need to install torches, soldering. There is also no need to glue to attach fittings.

The danger of fire occurs during installation, while when solding it is present, since the wick lights are used. Because of the flame and high temperature may occur. When using polyethylene, such a problem will not arise.

Special properties


PND (polyethylene low pressure) It has special properties that contribute to the strength and long-term material service. PND manufacturers offer about 25 years. If the pipes are made according to the method of cross-linked polyethylene high pressure (PVD), then they are more resistant to destructive properties and corrosion.

Suitable for hot and cold pipes

The convenient location of the color cadry eliminates any confusion. As a rule, red is used for hot water, and blue - for cold.

Environmental benefit

Polyethylene more acceptable for ambientUnlike copper and zinc.


Disadvantages of stitched polyethylene

Unfortunately, such pipes have their own minuses. Consider them in more detail.

Sunlight degradation

Polyethylene cannot be used in places where concentrates a large number of sunlight. Direct sunlight entering the quality of the material.

Insect damage

The material attracts insects that permeate the plastic heating system, because of what holes appear, and, therefore, water leakage appears.

You can not use glue

It negatively affects the polyethylene material, causing it premature aging. Such heating systems often strongly suffer from using isolation glue. Therefore, insulating materials should be selected very carefully.

Negative impact on health

It is believed that polyethylene material does not affect human health. This is due to the large accumulation of harmful chemicals that fall into the water flowing through the pipes. Such substances such as, for example, tert-butyl ether and butyl alcohol are very harmful.

Installation of the polyethylene heating system

There are two ways to install pipes made of cross-linked polyethylene: using compression fittings and inadressive. The first option is much easier. The algorithm of actions in this case is:


  1. send a thread in the direction of the connector and put on the crimp nut on the pipe;
  2. then we put a split ring on the pipe, but its edge must retreat from the cutting pipe by 1 mm;
  3. before the stop, put the pipe on the fitting fitting;
  4. complete by twisting the crimp nut using wrench.

Remember that spinning the nut must be extremely careful not to damage the pipe with excessive force.
When installing with the use of handling fittings, a special press equipment is necessary. And the installation itself is made as follows:


  1. put on a pipe of the continuous clamping sleeve;
  2. up to the stop, insert the extender in the pipe the required size into the pipe;
  3. smoothly twist the extender handles before stop and hold them in this position for a few seconds;
  4. before you stop, put the pipe in the fitting fitting;
  5. using the press, press the sleeve for the fitting.

It is worth a preference to pipes, stitched from polyethylene, and it will be optimal decision For heating at home. Such a system will serve for a long time without delivering to residents of any significant inconvenience.

Wear-resistant I. flexible pipes From stitched polyethylene for heating are in demand in the pipe product market. Find out what kind of types of such pipes produce and how to install in all the rules.

Polyethylene heating pipes

Features of the material

The method of production of polyethylene affects the technical characteristics of the finished pipe. In the production process, the material is subjected to high pressure processing, it gives it increased strength. Overmolecular polyethylene - the result of polymerization of ethylene. The material has a mesh molecular structure and additional intermolecular bonds. Therefore, it has both durability and elasticity at the same time.

The molecular model of standard polyethylene has a linear structure with weak interatomic bonds. In the sewn polyethylene, the molecules are tightly connected to each other, and additional side bonds form a grid similar to the structure of solids. Depending on the stitching technology, substances are obtained with different amounts of intermolecular bonds and different strength.

After deformation, stitched polyethylene strive to take the initial shape. Most durable material It has a labeling of Rh-a. It is produced by processing peroxide. The products obtained in this method are resistant to the appearance of cracks and are not deformed due to the high temperature.

Specifications

The density is 940 kg / m 3, the melting point is 200-400 ° C, the combustion temperature is 400 ° C, the thermal conductivity of 0.38 W / MK, the linear extension coefficient of 0.12-0.14 mm / MK.

The degree of crosslinking affects the cost and strength characteristics. The standard indicator is ranging from 65% to 80%. Polyethylene is silane (in the material there are organsiloxanes, the degree of crosslinking 65%) or pyroxide (in production, pyroxides are used, the degree of crosslinking is 85%). The material is obtained and with the help of ionizing radiation (degree of crosslinking 60%). As a result of the application of new technologies, a wide "stitched" polyethylene is obtained.

  • Benefits
  1. The material withstands pressure 10 atmospheres, the temperature of 95 ° C and does not lose strength even at minus temperatures.
  2. The inner surface of the pipe does not "overgrow" over time, not deformed during hydrodars, has dielectric properties.
  3. The service life is 50 years. Polyethylene is not corrosion and does not react with aggressive media.
  4. Products do not contain harmful substances.
  5. The material is not deformed when freezing, has plasticity.
  6. The moisture is not condensed on the surface of the pipe.
  7. Polyethylene pipes are suitable for autonomous, and for central heating.
  8. The price of the polyethylene tube is lower than the metalplastic.
  • disadvantages
  1. The material is destroyed under the influence of direct sunlight.
  2. Due to the lack of the reinforced layer of the product, it is difficult to give the right shape and hard to fix.

Installation of a warm floor

Step-by-step instruction

  1. To ensure the waterproofing of the future warm floor, the surface of the screed is aligned and covered with polyethylene film.
  2. For improvement thermal insulation properties on top stacked polystyrene slab With the embossed surface in the form of bunches (there is a pipe between the protrusions). The magnitude of the step between the pipes is 10-30 cm (the distance is chosen depending on the desired temperature in the room and the heat loss). Under standard conditions for 1 m 2, 5 meters of pipe are used.
  3. From above, to harden the screed, have a reinforcing grid. In order to compensate for the thermal expansion of the screed throughout the perimeter of the room lay the damping ribbon. Such a heating system can be used as an additional or as the main one. The temperature at the inlet 30-40 ° C and the pressure of two atmospheres ensure energy savings and gentle mode of operation of the system elements.
  4. Compounds are performed using brass fittings.

Important moments

  • The crosslinked polyethylene of the REH has antidiffusion properties that provide tightness and uniform heat transfer.
  • When repairing old pipes without disassembling, the pipe of the rex is dragged inside the steel pipeline in the folded form. When applying the working medium, polyethylene pipes are straightened, forming a new, durable surface.
  • When laying heating in the wall or in the floor, two methods of laying are used: concrete (the pipe is mounted on the mesh and poured with concrete) and dry (the pipe is installed in a special gutter, it is closed with a carpet or other coating on top). The first method is more reliable. When creating a warm floor without a screed, also has its advantages: the laying requires less space, and the mounting speed is higher.
  • Highly commencement allows you to get the most solid, but at the same time the least flexible products.
  • The PEX-A material has the highest melting point and shock resistance.
  • Such pipes are connected by press fittings and collet fittings.

Scope of application of stitched polyethylene pipes: Fire extinguishing systems, gas and heat supply systems (radiator type and with geothermal thermal pumps), water supply (with hot and cold water) and irrigation lines.

Stitched polyethylene pipes for heating - pluses and cons of material, portal about pipes


Polyethylene pipes for heating: specifications, features of material, laying of the "warm floor" system. Advantages and disadvantages of stitched

Stitched polyethylene tubes (re-x) for heating

Metal pipes in heating systems lose their popularity due to the rapid coating of rust and scoring. It comes to a shifting of polyethylene. This is high quality material and is widely used in the production of pipes.

The world designation sounds like re-.

Shched Polyethylene Pipes Rehau

Types of polyethylene pipes

To begin with, it is worth saying that there are polyethylene pipes:

  • designed specifically for the heating system;
  • only for water supply;
  • universal (for water and heating).

Structure of stitched polyethylene pipe

4 types of polyethylene pipes can be distinguished (they all differ in terms of cost and properties):

  1. The crossover by electronic method is the irradiation of the finished product. Referred to as re-hs.
  2. The crosslinking by the physical method is an irradiation with an x-ray. On labeling is re-hs. Characterize such products with rigidity and constant form. Not resistant to a strong decrease in temperatures.
  3. Chemical method with a chemical method (silane). According to the model - PE-XB. This way is budget, and at the same time a good quality product.
  4. Stitching with hydrogen peroxide. It is considered a grade of the highest quality (re-ha). It is resistant to hymopions, to a decrease in and increasing degrees to 110 ° C, to physical influences, keeps the form.

Features, dignity and disadvantages

The pluses of cross-linked polyethylene can include the following items:

  1. Since the pipes for heating from cross-linked polyethylene are perfectly tolerated high pressure and temperature, they have been applied in the "Warm floor" system, as well as hot and cold water systems.
  2. Very flexible.
  3. Sustainable mechanical effects due to aluminum layer.
  4. Easy to mount in contrast to pipes from copper or zinc. Since you do not need to solder and install torches. Plus, the fire and fire simply cannot.
  5. Environmental and do not pollute the environment.
  6. They are not terrible corrosion due to its structure.
  7. Inside the design will never form layers that interfere with the flow of water.
  8. Small weight, at the expense of transportation and installation.

Rehau tool for mounting pipes from stitched polyethylene

The following items include minuses:

  1. Pipes for heating from stitched polyethylene categorically do not tolerate ultraviolet rays. Under the sun, the material of the product begins to disintegrate and makes water harmful to use, fills it with toxins. Better decision There will be a coating of polyethylene tubes with varnish.
  2. A nitric acid and other powerful oxidizers are very poorly affected by the stitched polyethylene pipes for heating.

Each manufacturer of polyethylene pipes offers a corporate instrument for mounting them.

Pipe manufacturers for sewn polyethylene heating.

The market leaders are company as REHAU, KAN-THERM, UPONOR.

Consider the features of their products.

The company produces four types of polyethylene pipes under the Rautitan brand, namely Pink, His, Stabil, Flex.

Pipes made of stitched polyethylene for heating Rehau have the following features: they are durable, easy to install, have a unified fitting program for heating and water supply.

Characterized by a compound technique on a sliding sleeve without rubber sealing rings. Have small pressure losses on local resistances.

Pipes for heating from stitched polyethylene Rehau is an optimal price / quality ratio.

Pluses of RAUTITAN PX polymeric fittings in the excerpt of long-term stretching loads, rust resistance, good impact strength.

Respond to all hygiene standards.

Components of the system consist of pipes (diameters from 16 to 63 mm), fittings and supervision sleeves and other components (cuffs against fire, program brackets, fixing gutters, tubes for connecting heating devices, etc.).

KAN-THERM PUSH system has a number of advantages. First, it is operational durability (over 50 years!). Secondly, resistance to pipe contamination with a boiler stone. Thirdly, insensitivity to hydraulic shocks, as well as the high smoothness of the inner surface, microbiological and physiological neutrality in drinking water supply systems.

Materials of pipes are environmentally friendly.

Have a quick and easy installation and low weight.

PE-RT pipes KAN-THERM PUSH system are available (in accordance with DIN 16833) from octane polyethylene copolymer (DOLEX). PE-XC pipes are available (in accordance with DIN 16892) from high density polyethylene and are subjected to a molecular stitching process of electrons.

All species have a protective layer, which prevents the diffusion of oxygen into the coolant through the pipe wall.

May be milk or red.

Pipes (depending on which diameter) is supplied in bays of 200, 120, 50, 25 m in cardboard packaging, as well as on bobins for 600, 700, 850 or 1100 m - are used in the case of laying warm floors.

Pipes made of cross-linked polyethylene for heating The Utean is made of transverse-cross-stitched polyethylene PEX-A, which is obtained by crossing hydrogen peroxide in high temperature and pressure.

The manufacturer gives quality guarantee and declares the service life of more than 50 years.

Installation at temperatures up to -15 ° C is a decrease in the seasonal dependence of the installation.

Will not overcome limestone and other deposits.

Diameter - from 16 mm to 110 mm.

Well suited for hidden gaskets (in the tie of the floor and in the strokes of the walls) and in the warm floors.

Many use polyethylene tubes for floors of floors (the "warm floor" system) and mark the easy installation that you can make it yourself.

Thus, cross-linked polyethylene pipes for PEX heating have its advantages and disadvantages. They need to be considered when choosing this heating system. They are easy to assemble and very reliable.

I think about changing the house all pipes on the crosslinked polyethylene (PEX).

I saw the pipe Rehau, I can't say anything bad. Advise which companies are better and more profitable to use the heating pipes from stitched polyethylene?

In the case of Rehau, probably how it often happens, overpay for the brand. There must be an alternative, which is not inferior to REHAU in quality, but a little cheaper.

Of course, you can try polyethylene pipes of another brand, for example, Sanext. They are produced in our country, and cheaper somewhere for percentage so 30%. Negative reviews are small, seey budget analogue Rehau. But at present, Rehau pipes from stitched polyethylene for heating is the most reliable and convenient, which is in the market. They are better than copper and metal-plastic, have less deficiencies. With PEX it is convenient to install installation, because They are well bent and are very durable.

Stitched Polyethylene Pipes for Heating - Rehau, Kan, Uponor


Stitched polyethylene pipes for heating is the reliability of your pipeline. Features, species, pros and cons of re-x. Polyethylene Pipes Rehau, Kan, Uponor

Stitched polyethylene tube Best choice for heating

Polymer materials today are able to replace traditional metal and various alloys in many industries and construction. On the this moment The demand for the so-called low-temperature heating systems, which fully cope with the heating of the entire room or its individual sections at a coolant temperature not higher than 80 degrees. In order to significantly save on materials for highways, instead of metal, cast-iron or alloy pipes, alternative material is very often used - stitched polyethylene.

Pipe made of stitched polyethylene for heating is considered the most suitable analogue due to many technical advantages, among which the ease of installation, high mechanical strength and a small cost.

Main ways of production

Polyethylene is a synthetic material with a high molecular structure. Thanks to the stitching, it receives additional strength and chemical resistance - the main properties characterizing the pipeline highway.

The stitching process itself under modern production can pass three main ways:

  • radiation-beam. The flow of charged particles penetrates the molecular structure of polyethylene and rebuilds it, forming more durable and sustainable bonds. Coefficient of stitching in this way is approximately 60%;
  • chemical method using organic sifum (silane method). Due to the effects of chemically active reagents, the degree of strength of at least 65% is achieved;
  • peroxide method. The method also refers to a chemical variant, hydroperoxides affect polyethylene. It is considered the most efficient (the crosslinking coefficient reaches 75%), but also the most expensive and technologically difficult.

What method received the final material - not fundamentally, it all depends on the coefficient of stitching. The higher the indicator, the topics of the polyethylene tube will be more durable, chemically resistant and can be used in a higher temperature range.

In parallel, with increasing indicator, the fragility of the material increases, as well as its flexibility and plasticity decreases. With the maximum value of the coefficient closer to 100%, the stitched polyethylene tube in its physical properties will resemble glass. It is for this reason that the optimal value is considered the degree of stitching from 65 to 70%.

Basic properties

The pipeline from stitched polyethylene, regardless of the method of obtaining, has unique technical properties:

  • high wear resistance and durability. One of the most important indicators for pipes. Under compliance with the installation conditions, such a highway will serve at least 50 years;
  • low degree of thermal conductivity. This characteristic is also important - the coolant is almost without loss reaches the desired section of the heating system;
  • increased coefficient of resistance to temperature fluctuations and hydrowards;
  • high degree of hygienicness. This property allows the use of stitched polyethylene tube not only for technical highways, but also for household use.

In addition, in case of temporary effect on the pipe of the deforming forces, the product returns to its original state, if the threshold of irreversible (critical) deformation is passed.

One of the most significant constructive features is an three-layered product - Between the two layers of stitched polyethylene, an additional solid aluminum foil is placed, which is simultaneously a reinforcing layer and heat insulator.

Areas of use

Due to its excellent technological properties, stitched polyethylene pipes are widely used in various industries. First of all, these are various household application pipelines. Stitched polyethylene tube for a warm floor is best option Due to high reliability, a small heat loss coefficient and long service life.

Products are also actively used for low-temperature systems. radiator heating in apartment and private houses. As additional applications, the synthetic systems can be called or preventing icing in open areas.

Pipeline installation regardless of destination, produced hidden way - sub concrete screed (Warm floor), behind wall folders. Pretty popular method of laying highways in the shoes, followed by a solution or plastering. For proper montage Such a highway can serve as decades, because when closed design The probability of mechanical damage is reduced to zero.

Stitched polyethylene pipes are the most reliable option for creating various household trunk communications. The only feature of these products is not very low costwhich is caused by the time-consuming and costly crosslinking process and use qualitative materials. The money spent will pay off with a reliable service of such a pipeline for at least 50 years.

Today there are a large number of unscrupulous vendors and some manufacturers (mainly from China), which give cheaper plastic pipes for stitched polyethylene. The most famous firms producing high-quality products are german manufacturers Rehau and Tece, Italian brands Valtek and Unidelta, and inexpensive pipes from the Polish manufacturer Kan.

Stitched polyethylene tube for heating


Stitched polyethylene tube for heating - Major species, crosslinking methods, key features and specifications, different applications

7 tips, which stitched polyethylene pipes for a warm floor, heating and water supply better choose

Flexibility, strength, durability, the ability to restore the form after damage is the main, but far from the only, the advantages of stitched polyethylene pipes. They confidently push out other types of pipes from the market, are actively used when installing warm floors, water pipes (hot and cold) and heating systems. Are they so universal? We put all the points on the "I" and try to figure out which pipes from stitched polyethylene for a warm floor, heating and water supply is better to choose what to pay attention to when buying and what manufacturers can be trusted.

№1. Features of production

If it is in a special way to influence the usual polyethylene (polymer consisting of carbon and hydrogen atoms), then some hydrogen atoms are separated, leading to the formation of a new bond between carbon molecules. The process of obtaining these additional carbon ties is called stitching. Affects polyethylene with various substances and methods, therefore the degree of stitching may differ. The optimal indicator is 65-85%.

The crosslink allows to improve the properties of polyethylene: the resistance to high temperatures increases, the flexibility, wear resistance improves, and the possibility of self-healing after mechanical loads appears. The process of stitching developed in 1968 Swedish chemist T. Engel, but underestimated his invention, considering it uncompetitive. Patent has bought Wirsbo, which first in the world of the beginning industrial production Polyethylene pipes (PEX) and still is the leader in this area. At the domestic market, such products did not get immediately, but now enjoy great popularity.

PEX tube usually consists of three layers: inside - stitched polyethylene, outside - oxygen protected layer, they are connected with glue. There are also on sale and 5-layer pipes. They also contain a layer of glue and cross-lined polyethylene on top of the oxygen protected layer.

№2. PEX pipe stitching method

The most important parameter when choosing pipes made of stitched polyethylene is a crosslinking method that used the manufacturer. It depends on the number of additional connections formed, and therefore the performance of the product.

To form additional connections (bridges) in polyethylene use such crosslinking methods:

  • crosslovka peroxide, such pipes are marked with pex-a;
  • stitching silane, pex-b;
  • radiation stitching, pex-c;
  • nitric stitching, pex-d.

Pipe Pex-A. obtained by heating raw materials with the addition of peroxides. The density of stitching in this method is maximum and reaches 70-75%. This allows us to talk about such benefitsAs excellent flexibility (maximum among analogs) and the memory effect (when unwinding the bay, the pipe almost immediately takes the original direct form). The gears and chances that may appear during the installation process can be corrected if the pipe is a bit with a construction hairdryer. Main minus - This is a high price, since the technology of peroxide is considered the most expensive. In addition, during operation, chemical washing, and somewhat more intense than in other PEX pipes.

Pipe Pex-B. produced in two stages. First, organic sifums add in the raw material, receiving an incompatible pipe at the output. After that, the product is hydrated, and in the end the crosslink density reaches 65%. Such pipes are characterized by a low price, they are resistant to oxidation, have high pressure indicators at which the pipe breaks. In terms of reliability, they are practically not inferior to PEX-A pipes: even though the percentage of crosslinking is lower here, but the strength of the links is higher than when the peroxide stitch. Of minuses We note the rigidity, so they will bend them problematic. In addition, there is no memory effect here, so the initial shape of the pipe will be restored badly. With the appearance of the chances, only connecting couplings will help.

Pipe Pex-C. obtained at the so-called Radiation stitching: Polyethylene affect electrons or gamma rays. The production process requires careful control, because the uniform disorder depends on the location of the electrode relative to the pipe. The degree of stitching reaches 60%Such pipes have a good molecular memory, they are more flexible than PEX-B, but during operation cracks can be formed. The chances are corrected only by connecting couplings. In Russia, such pipes did not find widespread.

Pipe Pex-D. Produced by treating polyethylene nitrogen compounds. The degree of stitching is low, about 60%Therefore, on the operational qualities, such products are significantly inferior to the analogues. The technology actually went to the past and today is almost no applied.

You can find on sale pEX-EVOH pipes. They differ in non-crosslinking method, but the presence of an external additional anti-infusional layer of polyvinylethylene, which further protects the product from entering the oxygen pipe. By way of stitching, they can be any.

The highest quality are pipes Pex-A.But their high cost makes many use PEX-B pipes. These two types of products were most common in the market, and the choice between them depends on the budget, personal preferences and features of the pipeline, which must be built with their help.

Do not confuse stitched polyethylene tubes with:


Number 3. Advantages and disadvantages of pex pipes

Name pipes made of stitched polyethylene a unique and revolutionary product is difficult, but the benefits of the material, indeed, a lot:



Stitched polyethylene pipes are, of course, more than cast iron or ordinary polyethylene pipes, but still quite affordable, however, it will also have to spend on the appropriate fittings. Installation is performed using a special hand tool. At the same time, it is very and very important not to damage the protective layer. It can be said that the durability of the pipeline will depend on caution when working, which is why it makes sense to entrust the installation of certified masters.

№4. Usal scope

Operating characteristics of cross-linked polyethylene pipes allow them to use them for building the following engineering networks:

  • cold and hot water supply;
  • heating system;
  • water warm floor.

In the industrial purposes of the PEX pipes are not used - the material of large diameter (for example, for the main water supply) is expensive.

№5. Stitched polyethylene or metalplastic?

Stitched polyethylene pipes and metal-plastic pipes are the main competitors when it comes to the construction of water supply, heating systems or warm floors. They have a lot in common. Both types of pipes are quite flexible, durable, resistant to corrosion and relatively easy to install - welding certainly nothing. True, mount metalplastic pipes is still easier than pex pipes with which you need to be extremely careful

In metalplastic pipes, slightly above the thermal conductivity coefficient (0.45 against 0.38), but they will not survive the freezing inside the coolant. PEX pipes after the water in the system falls out, it will be possible to operate as before. Moreover, some types of PEX pipes easily restore their shape. Resistance to high temperatures and pressure is high in both types of pipes: metalplastic withstands the pressure of up to 25 atm at a temperature of 250 ° C, it can be operated at the temperatures of the coolant to + 950c with a short-term increase of up to + 1200C, however, the maximum pressure of 10 atm. Thus, the performance characteristics are completely comparable with similar parameters of the cross-linked polyethylene pipes, which we led above.

The choice depends mainly on the features of the operation of the water supply and budget. Locusing prices among pipes, even within the same group, significant, but PEX pipes are more often cheaper than metal plastic.

№5. Diameter and length

Stitched polyethylene pipes are sold in bays at 50, 100 and 200 m. Pipes with a diameter of 40 mm and more sold by segments up to 12 m. On the pipe along its entire length information should be inflicted Production material (stitching), operating temperature, pressure, diameter, date and place of production. For more convenience, some manufacturers are applied to the product risks exactly through each meter.

The choice of pipe diameter depends on the type of pipeline, water pressure in it, the number of consumers and other parameters. General recommendations According to the selection of diameters are as follows:

  • pipes with a diameter of up to 15 mm (10.1 * 1,1, 14 * 1.5 and others) are suitable for water supply from the main tap pipe to the cranes;
  • pipes 16 * 2 are used to organize warm floors, 16 * 2.2 are suitable for hot water supply and radiator heating. Pipes with a diameter of 16-20 mm can be used as the main pipe of cold and hot water supply apartments and small private houses;
  • pipes 20-32 mm are suitable for the organization of water supply in cottages are also used for heating, for warm floors, pipes are usually not used with a diameter of more than 20 mm;
  • pipes 40-50 mm are suitable for riser in apartment buildings;
  • pipes with a diameter of 50-63 mm are used both in heating systems and water supply.

Usually, the manufacturer indicates for what purposes is the best suitable for this or that pipe, for example, for heating, hot water supply, or it is universal in use.

Length to calculate It is not difficult, but for this there must be an exact plan for the water supply system, radiator or floor heating. We measure the length of the intended pipeline and multiply the value obtained by 1.2 is a stock for unforeseen situations that can happen during installation.

№6. Fittings for crosslied polyethylene pipes

Looking in advance, we note that the fittings are better to take from the same manufacturer as the pipes. Even with the same stated dimensions, the difference in the diameter of products of different manufacturers can reach 0.5 mm. In this case, it is difficult to talk about the absolute tightness and reliability of the system.

For compounding individual segment PEX pipes use such types of fittings:

Welding, soldering and gluing the seams of pipes from stitched polyethylene is impossible.

№7. Polyethylene pipe manufacturers

To be 100% confident that the pipeline after a couple of years does not have to repair, or at all - to change, it is better to take pipes from a proven manufacturer, which gives a warranty on all products. Large companies will not risk their reputation and produce low-quality products. So, today on the market of styled polyethylene pipes appear main producers:


Most manufacturers indicate the transcendant terms of warranty, it is 20-30 years old, and somewhere even all 50. The conditions for this guarantee must be studied carefully so that when installing and operating them, do not break them, otherwise the manufacturer will have its obligations.

7 tips, which stitched polyethylene pipes for a warm floor, heating and water supply better choose


Flexibility, strength, durability, the ability to restore the form after damage is the main, but far from the only, the advantages of stitched polyethylene pipes. They confidently push out other types of pipes from the market, are actively used when installing warm floors, water pipes (hot and cold) and heating systems.

The heating system requires the use of high-quality and wear-resistant materials, which is not afraid of high pressure and frequent temperature differences. All above declared characteristics correspond to polyethylene pipes for heating.

In order to give polyethylene flexibility, chemical and mechanical resistance, it is crosslinked by an electron flow. There are several different methods for the production of stitched polyethylene and, depending on the technology, the technical characteristics of the material are changed, however, the main advantages and disadvantages are still common.

The advantages of stitched polyethylene

In contrast to conventional polyethylene, stitched not softened and is not deformed under the influence of high temperature. This property allows the use of material for heating and a warm-alone system. In addition, stitched polyethylene (REH) has such advantages:

  • Complete absence of corrosion;
  • Pipes do not overgrow and do not stir;
  • Low weight;
  • Simplicity of installation and transportation;
  • Stalling tolerates large pressure drops and temperatures;
  • Does not crack;
  • Excellent noise insulation;
  • Resistance to the effects of negative temperature;
  • Has molecular memory;
  • Is environmentally friendly for humans and any other living organisms;
  • Inexpensive cost;
  • Strength;
  • Long service life (according to the assurance of manufacturers it is about 50 years).

The main disadvantages of the material

The positive qualities of stitched polyethylene made it indispensable for heating and a warm flooring systems. However, some shortcomings are still available, among which it is worth highlighting:

  • Lack of resistance to ultraviolet rays;

To reduce the destructive effect of ultraviolet on stitched polyethylene, pipes are covered with special protective varnish.

  • The possibility of mechanical damage, for example, rodents;
  • No resistance to the effect of surfactants;
  • Destruction under the influence of oxygen.

When oxygen gets into the inner layers of the pipeline, it is quickly destroyed. It is for this reason that many manufacturers add a protective layer from the effects of oxygen, the so-called oxygen barrier. This reduces the risk of product destruction, but it causes an increase in its value.

Design and method of producing pipe

Pipe stitched polyethylene is a multilayer design, which consists of five balls. The main layers are as follows:

  • Internal ball of cross-linked polyethylene;
  • Glue ball;
  • Oxygen barrier;
  • Glue ball;
  • Outer bowl of cross-linked polyethylene.

It is such a five-layer design that provides a high heat resistance of the material, because it is not deformed even with the indicators of the transferred fluid up to 95 ° C. That is why Rh is a remnable choice for heating and a warm floor.

For the manufacture of the pipeline, an escitruse method is used, which is to extrude the necessary form from molten polyethylene. After that, all pipes are taking a vacuum calibration. Products are supplied on sale in bays or cuts depending on the diameter.

Technical characteristics of products

The unique properties of stitched polyethylene have advanced it for one level with many solids. The main characteristics of the material include:

  • Melting point - 200 degrees;
  • The combustion temperature is about 400 degrees;
  • Stretching on the gap - 350 - 800%;
  • Density - 940 kg per m. Cube.

Pipeline made of polyethylene shched at the molecular level is produced in a wide range of diameter. Manufacturers offer sizes from 12 to 250 mm, but the diameters of 16 - 25 mm are most popular at the consumer.

Methods of crosslinking Rekh

There are about 15 methods of stitching polyethylene, however, three of them got the greatest distribution.

To date, stitching methods are in demand:

  • Peroxide (pex-a);
  • Silane (pex-b);
  • Radiation method (PEX-C).

More expensive, however, and a better method of stitching is peroxide. It is possible to link about 85% of free molecules precisely thanks to it. This allows the material produced in such a way to have increased resistance to mechanical exposure and have a higher melting point.

Rh-A - best Method The production of stitched polyethylene, all other options are only an attempt to reduce the material.

Reinforced heating pipeline

One of the latest innovations in the market for heating and a warm floor is a reinforced tube of cross-linked polyethylene. It has even greater durability and heat resistance than ordinary rex. The main difference in the production technology is to introduce in the walls of the pipeline threads in the wall, which occurs at the stage of extrusion of the form of hot molten polyethylene.

Reinforcement methods may be as follows:

  • Capron thread;
  • Kevlar;
  • Aluminum foil.

The reinforced pipeline withstands even such loads as the pressure of 30 atmospheres, does not crack when drying or bending. But the cost of products is higher, because for production it is necessary expensive equipment.

Key stitched polyethylene manufacturers

Stitched polyethylene is the most successful material for mounting the heating system and a warm floor. To date, a whole group of foreign and domestic companies is engaged in the production of high-quality and durable products. Key manufacturers are:

  • Rehau (Germany);
  • Valtec (Italy);
  • Uponor (Sweden);
  • TECE (Germany);
  • Bir Pekc (Russia).
  • Stout (Spain)

Rehau is a global leader in the production of cross-linked polyethylene pipes for heating and a warm floor.

The leading position in the global market today was taken by Reheau. It is its products that has proven themselves due to excellent quality and good operational characteristics. The price of products is not the cheapest, so many developers are looking for more budget options for their home, for example, the products of the Stout brand.

Stout is a professional plumbing equipment for mounting heating and water supply systems. Products are manufactured in the same European factories that other premium brands of the segment are ordered.

The main positions of the serenity of Stout products are the warranty of 5 years. All the details of the system are perfect to a friend to a friend, easy to install and maintain, adapted for operating conditions in Russia.


Different manufacturers are used various methods Polyethylene stitching: pex-a, pex-b, pex-c. The best way to crosski today is recognized as peroxide (PEX-A), it is for this reason that it is recommended to stop your product. trademarks Rehau, Uponor and Stout, which is produced by this technology.

The feeling of comfort in the house under all weather conditions outside the window is created thanks to the proper operation of the heating system. Its effectiveness, quality and service life directly depend on pipes. Today, the installation of the heating system is increasingly performed using stitched polyethylene pipes. The properties of this material allow it to largely exceed other options. However, when installing such pipes, you need to know some nuances that will be discussed in this article.

Product specifications

Pipes from ordinary polyethylene (re) are widely used to create heating, water supply, sewage systems.

Their main characteristics include several points.

  • Frost resistance to use polyethylene structures at temperatures up to -20 degrees. This is a big advantage, as it makes it possible to carry out any work with pipes in winter, including mounting new equipment or repair the failed system.
  • High temperature resistance (up to 40 degrees).
  • Flexibility that does not give pipes to deform when flexing.
  • Plastic. Polyethylene products can be expanded or narrowed depending on the temperature without losing their form.

In order to obtain a higher pipe strength, a reliable and high temperature-resistant material called "Stitched polyethylene" (REH) was created.

Its main feature is the maximum operating temperature - 90 degrees. Sometimes such pipes can withstand the temperature of 100-110 degrees, while maintaining normal operation within a certain time.

Another important feature of pipes from stitched polyethylene is a high oxygen permeability. When installing such products, it is necessary to remember this property and use aluminum foil to protect them or a special coating of polyvinylethylene.

Methods of production

The technology of "stitching" polyethylene in 1968 invented Swedish chemist Thomas Engel. In 1972, one of the Swedish companies put it on an industrial flow. This technology And today leads the market.

The meaning of the process of "stitching" is to connect molecules into a three-dimensional mesh as a result of the formation of cross-links. In its course, polyethylene, the molecule of which contains atoms of hydrogen and carbon, loses part of hydrogen. Therefore, free connections appear to connect molecular links with each other, as a result of which the molecules are tightly "stitched" with each other.

Exist different methods obtaining stitched polyethylene.The technical characteristics of the finished pipe depend on the method. The longest, but at the same time the highest quality method is polyethylene processing peroxide. It gives the highest degree of crosslinking (85%). A pipe from such a material can easily withstand low and high temperatures, resist the effects of chemicals, gains resistance to shocks and other mechanical effects, can restore its original shape.

Another method is the irradiation of the material by electrons in the electromagnetic field. Such stitching implies irradiation with electron finished products.

There is also a physical sewing method at which X-rays are used.However, such structures are hard. They are not resistant to heavy cold and cannot be returned to the previous form.

Common is the chemical method of silane sewing. It is more effective compared to physical. It turns out the optimal price and quality of polyethylene, suitable for use in everyday life.

Thermally resistant, strong material, pipes from which are perfectly suitable for mounting the heating systems of any type, hot and cold water systems, equipment of warm floors is obtained as a result of each production method. It is only necessary to choose the right characteristics correctly, and also remember that, the higher the degree of stitching, the higher the price of the material.

Dignity

Stitched polyethylene pipes have a number of advantages, thanks to which they are most often used for mounting heating systems.

  • Resistance to high temperature (up to 95 degrees). Products made of stitched polyethylene are capable of expanding or narrowing to certain sizes under the action of low and high temperatures.
  • Excellent mechanical strength achieved due to the good molecular memory of the material. It easily restores the original form after deformation, unlike conventional polyethylene pipes.
  • Corrosion resistance. Products made of stitched polyethylene are not afraid of corrosion neither inside or outside (as opposed to, for example, copper). This quality allows not to wash and clean the pipes of the REX, which is periodically necessary for their metallic "fellow" and has a rather high cost.
  • Warranty from the appearance of outputs inside the pipes. In contrast to steel pipes, which after a while are covered from the inside by the growths that slow down the speed of the duct, the inner walls of the pipe pipes have a special teflon coating and are not susceptible to layering. Due to the smoothness of the inner walls in the heating system, high hydraulics is always high.

  • Light weight material. For example, 1 m tubes with a diameter of 16 mm weighs only 90. Therefore, they are convenient to transport and easily mount.
  • Easy installation. Rech products can be mounted according to any scheme. They allow you to make a loop and any number of bends. It does not require special welding equipment, as the pipes are connected, without requiring soldering or gluing. Heating pipes are implemented at 100 and 200 m, which makes it possible to mount large areas of the system without using fittings.
  • Rech products are environmentally safe, as well as resistant to reproduction within them malicious bacteria. The material is entered into a group of environmentally friendly, so it is widely used for drinking pipelines.

disadvantages

Despite the huge number of advantages, stitched polypropylene cannot be called perfect.

It is worth considering and its shortcomings.

  • Brass fittings used when connecting pipes from stitched polyethylene for heating are subject to corrosion, so you have to pay close attention to the choice of materials for screed or plaster. It is better not to use materials that cause corrosion of fitting, otherwise the quality of the work of the heating system will noticeably fall.
  • Pipes made of stitched polyethylene "fear" ultraviolet. Therefore, they are more suitable for use in rooms, in closed systems and communications. To use such outdoor products, a special protective casing is required.
  • The price of such pipes, in contrast to the cost of metal plastic and conventional polyethylene, is quite high.

Therefore, before purchasing pipes from stitched polyethylene, it is necessary to carefully examine all the technical characteristics of the heating and water supply system of the room in which they are planned to be mounted.

Work process

If, when mounting metal pipes, special knowledge and skills are needed, then when installing cross-linked polyethylene pipes is not required. For high-quality performance, only certain tools and a little effort are needed.

Stitched polyethylene tubes are connected by fittings from different materials: polymers, brass, bronze.It is the best to use polymer fittings (for example, Rehau), since they are high-quality, are not subject to corrosion and serve for a long time.

In general terms, the process of installation of pipes of the RAX:

  • the end of the connecting structure is expanding with the assault tool, giving it a larger diameter;
  • put fitting fitting there;
  • using the press, the tension sleeve is compressed, giving the greatest strength to the connection.

Such a technology makes pipe compounds reliable and durable. The service life of such systems corresponds to the service life of the pipes themselves.