Soviets, what pipes made of stitched polyethylene for a warm floor, heating and water supply is better to 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 outpace 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? Let’s put all the points on the “I” and try to figure out which pipes made of 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.
If at 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. Affect polyethylene with different substances and ways, so the degree of stitching may differ. The optimal indicator is 65-85%.
Stitching allows you to improve the properties of polyethylene: the resistance to high temperatures increases, the flexibility, wear resistance improves, the possibility of self-healing after mechanical loads. The stitching process was developed in 1968 by Swedish chemist. Engel, but underestimated his invention, considering it uncompetitive. Wirsbo’s patent was bought by Wirsbo, which the world’s first began industrial production of cross-linked polyethylene pipes (PEX) and is still a leader in this area. On 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. 5-layer pipes are on sale. They also have a layer of glue and cross-linked polyethylene.
The most important parameter when choosing pipes from stitched polyethylene is a crosslinking method that produced a manufacturer. It depends on the number of formed additional connections, and therefore the performance of the product.
For the formation of additional connections (bridges) in polyethylene use such crosslinking methods:
PEX-A pipes are obtained by heating raw materials with peroxide adding. The density of stitching in this method is maximum and reaches 70-75%. This allows us to talk about such advantages as excellent flexibility (maximum among analogs) and memory effect (when unwinding the bay, the pipe almost immediately takes the original direct form). Geeks and chances that may appear in the installation process can be corrected if you warm the pipe with a construction hairdryer. The main minus is a high price, since the technology of peroxide stitching is considered the most expensive. In addition, during operation, chemical washing is going through, and somewhat more intense than in other pex pipes.
PEX-B pipes produce in two stages. First, organic silaneons add in the raw materials, receiving an incompatible pipe at the exit. After that, the product is hydrated, and as a result, the density of the stitching 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 here is lower, but the strength of the links is higher than when the peroxide stitch. From minuses we note stiffness, so they will bend them problematic. In addition, there is no memory effect here, so the initial shape of the pipe will be restored bad. On the appearance of the chances only connecting couplings will help.
PEX-C pipes are obtained when.N. 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 crosslinking reaches 60%, such pipes have a good molecular memory, they are more flexible than PEX-B, but in the course of operation, cracks may be formed. Chances are corrected only by connecting couplings. In Russia, such pipes did not find widespread.
PEX-D pipes are 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 into the past and today is almost no applied.
You can find PEX-EVOH pipes on sale. 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 PEX-A pipes, but their high cost makes many PEX-B pipes. These two types of products were most distributed in the market, and the choice between them depends on the budget, personal preferences and features of the pipeline, which you need to build with them.
Do not confuse stitched polyethylene tubes with:
- low pressure polyethylene pipes, they maintain no more than 40 0 s and are suitable for cold water supply systems;
- Pipes from undergraduate polyethylenepert, there are no intermolecular connections, instead of them there is a weave of the chains of the polymer and their clutch. Such pipes recently appeared on the market, withstand temperatures up to 70 0 s;
- heat-resistant polyethylene pipes. They are also able to withstand the effects of high temperatures (due to the introduction of heat-resistant additives into the polymer), but will not be able to work as long as PEX pipes, work at high temperature and other loads.
Application of pipes depending on the diameter
In fact, everything is not so difficult. As a rule (but not always) in residential premises, be it apartments, houses, country cottages, usually use 16mm pipe diameter of a warm floor. At the same time, the size of the room does not play the main role here. It can be like a one-room apartment with an area of 40 kV. m and mansion whose area is about 300 kV. M.
In what cases can be used a pipe with a diameter of 20 mm? Take, for example, a large sports room with an area of 700 kV. M. This is a non-residential premises and it needs a dense thick dense heat insulation, as well as a thick screed with a thickness of 100 mm or more, depending on the coating. In accordance with these characteristics and choose a pipe of a warm floor with a diameter of 20 mm.
But note that the diameter of the pipe is not selected simply so. After all, there are exceptions, and 20 mm pipes can be used both in public buildings, for example, in a shopping center or even in the hospital and in residential premises. In order to determine the pipe by some diameter and where to use, conduct special calculations and only then begin to install warm floors.
Warm floor with polypropylene pipes
Polymer pipe products for floor heating systems are distinguished by reliability, durability, harmlessness and low cost. Many polymer pipes are chemically neutral.
The system of polypropylene products is obtained inexpensive, but such a solution is quite risky. To bend the pipe for a warm floor to bend, it should first be heated with hot air, after which it is in a preheated state to give the desired form. At the same time, the bending radius is obtained by a large, equal to 8 external diameters.
Thus, for a 18-mm pipe, the minimum value of the bend radius is about 15 centimeters. If a smaller step is needed, you can use fittings. corners, but in this case the reliability of the compounds will depend on the quality of pipe products and welds.
Since there are many fakes of polypropylene products, it will take mastery to perform welding. And even after the work is done qualitatively, there is a big risk of leakage in places of compounds.
To avoid similar troubles, it is necessary to check the quality of welds. For this, before filling the screed, the system is left for several days in working condition under excess pressure. If the verification is completed successfully, then in the conditions of normal pressure and temperature in the range of 35. 55 degrees, the design should function long.
But it is necessary to equip the flooring system with heating using branded PPR pipes with a reinforced layer in the middle of the material of manufacture. After high-quality welding, the compound is obtained by monolithic, and the cost of pipe polypropylene products, as the fittings are small. Another advantage of such pipes is that they are able to transfer several frost cycles. Situation.
From the disadvantages it should be noted the need to use the welding machine, and the installation process itself is rather complicated and continuous on time, since you need to make a lot of welds. It does not matter about the mechanical strength of the Polypropylene, so the screed must have a thickness of at least 5 centimeters.
Metal plastic pipes for water floor
Pipes from metal plastic are much cheaper than copper, so they enjoy well-deserved popularity.
Among the advantages of such products can be called:
- high oxidation resistance;
- long service life. about 50 years, as well as copper;
- A small mass. thanks to this pipe, it is convenient to transport and lay it;
- Ecology. polymeric materials do not react with impurities in the coolant;
- Soundproofing. Water passing through pipes does not create such strong noise, as in contact with steel.
The structure of metal-plastic pipes involves the presence of several layers. the polymer material inside and outside, as well as aluminum that gives the material. From the inside the surface of the pipe is very smooth, so the walls are not formed on the walls. In addition, this layer protects aluminum and adhesive materials from water.
From how high-quality glue is used for pipe production, their durability will depend on. If the adhesive begins to collapse, the polymer layers will lag behind, and the pipe will lose hermetically. It is possible to determine the quality of the adhesive by heating pipes up to 90-100 and evaluating the result.
Ideally, the appearance of the product on the cut should remain the same. If the layers of materials become clearly visible, then you should not stop your choice on these products.
Although metalplastic pipes do not withstand an open flame, this does not affect the arrangement of the warm floor. In this case, it is worth thinking what diameter to choose a pipe for a warm floor, taking into account the available fittings. If their inner section is less than the diameter of the pipe, a lime flask will be formed on the seams (read: “Which diameter of the pipe for a warm floor is better to use. calculating the diameter, depending on the material of the pipe”). Over time, this will lead to the leaking coolant.
The operating temperature range for metal-plastic pipes is from.10 to 95. Possible short heat up to 110 ℃. In case of overheating, the pipe will be hopelessly corrupted.
Please note that when installing fittings, it is important not to overplay the cape nut so that an incision for the pipe is not formed. it can cause leakage. If you do not have the skills of such work, it is better to trust the laying of warm sexes to specialists.
Types of pipes for heating and their features
Pipes from stitched polyethylene PEX
We decided to start our review from these pipes, since in many indicators they exceed solutions from other materials. Their advantages:
- Operational period of 50 years;
- PEX pipes are capable of perfectly transferring short-term peak temperature values;
- They are resistant to ultraviolet radiation, have excellent thermal conductivity and a solid structure;
- Good price-quality ratio, they are inexpensive.
However, these models have flaws. Upon the exit of such pipes, they are fully changed. Two PEX Heal Pipes have a large bend radius and oxygen transmission through the walls.
PE-RT High Heat Resistance Pipes
It is a heat-resistant look, which is distinguished by durability, ease of installation, durability and smoothness. Such pipes can be used as a solid design when conducting a warm floor.
The disadvantages of these models can be attributed to the fact that they have the ability to expand when heating and are quite sensitive to temperature and pressure drops.
Polypropylene has less density and elasticity than polyethylene, so the pipeline of them is obtained with thicker walls. Such pipes have quite affordable cost, they are easy to install, have high resistance to temperature effects. Due to the high level of strength, such pipes can be served for about 50 years.
The negative qualities include the fact that their service life directly depends on the duration of the effects of peak temperatures. They are limited in length, so when mounting, seams appear in which the fluid passability can be reduced.
polypropylene pipes have a low level of thermal conductivity, rapid wear with excessive saturation of oxygen or temperature drops, and also turn out to be destruction when exposed to ultraviolet radiation.
Despite the high price, they are often used to organize a warm floor in private houses. Copper has good resistance to temperatures and ultraviolet radiation. And pipes from it form a special film from oxide, which prevents corrosion.
Among other advantages of pipes from copper can also be noted:
- simplicity in the processing and laying of the material;
- reliability and simplicity of pipe connection between themselves;
- high level of thermal conductivity;
- environmental Safety;
- as well as a significant length that allows you to lay pipes without seams.
However, copper pipes also have disadvantages. For example, they are easily destroyed by the action of electrochemical corrosion, have a low level of resistance to acid and alkaline environments, if they are higher than the rate indicators.
Metal plastic pipes
They consist of 3 layers, mean of which is aluminum foil thickness from 0.3 mm to 0.5 mm. It is designed to strengthen the design and simplify the flexibility of the pipe.
Metal-plastic pipes are inexpensive, can serve about 50 years and to withstand temperatures up to 90 degrees. Among other advantages can also be distinguished by a high level of corrosion resistance, strength, smoothness, solid structure and complete absence of electrical conductivity.
Negative qualities include the fact that such pipes have poor resistance to the transfer of ultraviolet radiation and low thermal conductivity.
Corrugated stainless steel pipes
The main advantage of such pipes is that they have a practically unlimited service life. In addition, they perfectly carry high temperatures, have an oxygen impermeability and resistant to ultraviolet radiation.
Corrugated pipes have a small bend radius and high thermal conductivity. Their length allows one to carry out solid heating. Also, the advantages of these products include low cost. However, such pipes are less resistant to electrochemical corrosion and in the case of excessive inflection can form elevations.
Heat Pipe Diameter
When you have decided on a pipe of a warm floor, it’s time to choose the desired diameter. 2 diameters are most often used: 16 and 20. Use big diameters does not make sense.
In most cases, you will have 16 diameter of a warm floor pipe. In 90% of cases, it takes place on heat engineering characteristics. Plus it is very convenient to work with him.
Pipes 20 diameter You can also use, considering a slightly enlarged stacking step and complexity in flexion.
Use of formulas for calculating diameter
You can find the diameter of pipes for the arrangement of water heat can be by applying the formula that experts at one time amounted to:
ProWarm warm water underfloor heating kit installation. Pipe Staple method
- D. the inner diameter of the pipeline;
- P is the pressure of the pumping equipment used for the heating system, to find out this parameter can be from the documentation attached to the circulation instrument;
- L. the designer length of the heating circuit. Do not forget that the maximum length of the pipe of the warm floor is limited;
- G is the volume of water required to ensure the circulation of the heating system, the value of this value can also be taken from technocamentation;
- 18 and 0, 19. unchanged parameters that were obtained as a result of the compilation of this formula.
Price on pipes
The most accessible are PE-RT pipes of the first type, then there is a PE-RT of the second type. When adding an Evoh layer, the price of PE-RT rises almost twice. Followed by the price of PEX pipes from stitched polyethylene. Expensive are metal-plastic pipes themselves.
In its characteristic features, metalplastic can be put up above polyethylene pipes. By the number of layers, costs, and as a result it has an increased value. He is also very difficult in the installation, t.to. There are their nuances.
Polyethylene pipes are less durable, but they are monolith compared to a plurality of metalplastic layers. Many other differences in the characteristics of the warm floors do not have their own fundamental importance.