PERT pipes. PE-RT, a new class of polyethylene for the production of metal-plastic pipes for hot water supply and heating Stainless steel and copper pipes
Pipe Thermotech Thermosystem®(old name Thermotech >MIDI< Composite) является модернизированным вариантом труб PE-RT, полностью изготовленной из материала Dowlex 2344 (тип 1) и 2388 (тип 2) (PE-RT, trademark Dowlex is owned by DOW Chemical Corp.) with a large number bonds between molecules, with an oxygen barrier (EVOH) hidden inside the pipe between layers of polyethylene. Because All layers are polymers, then as a result of sequential connection of layers, a pipe is formed as a single whole, stable under conditions of temperature and pressure fluctuations, with a small linear elongation, resistant to mechanical stress.
Let's decipher the abbreviation PE-RT - PolyEthylene of Raised Temperature resistance - polyethylene of increased temperature resistance - the secret lies in large quantities carbon bonds in molecules. The side chains of the linear Standard Polyethylene (PE) molecule are formed by a combination of butene molecules. Two carbon atoms are used to connect the main chains to each other, so the probability of intertwining is low. The side chains of the linear PE-RT polyethylene molecule increase the number of connecting Carbon atoms to 6, while the degree of intertwining is much higher. If the source material for PEX - Polyethylene, with the same monomer content, is not “cross-linked”, then it will provide much less strength under prolonged exposure to pressure.
Warm floor pipe Thermotech Thermosystem®– has an anti-diffusion layer OXYDEX (EVOH polyethylene), which prevents the penetration of oxygen and an anti-creaking layer, which form a single whole with the pipe.
Anti-diffusion layer OXYDEХ: In pipe production, on the “main” surface PE-RT pipes a thin layer of modified polyethylene, 0.1 mm thick, is applied. This is followed by the same layer of EVOH (ethyl vinyl hydroxide) plastic. Previously, this anti-diffusion layer was applied to outside pipes. Over time, some manufacturers and Thermotech pipes, incl. They began to apply another protective layer of polyethylene on it.
New polymer pipes from Thermotech - ThermoSystem pipes made of PE-RT type II polyethylene - are more flexible and more reliable compared to the old ThermoSystem pipes (12, 17 and 20 mm) due to the placement of an anti-diffusion layer on the inner surface of the pipe with a protective layer polyethylene. The oxygen barrier is protected from mechanical damage by the entire thickness of the pipe wall
The EVOH layer acts as a diffusion barrier for oxygen, and the polyethylene layer increases the adhesion between the pipe and the diffusion barrier. The barrier is tightly glued to the pipe, making bends of small radii possible without the formation of folds. Oxygen-tightness of pipes Thermotech complies with the DIN 4726 standard (Deutsches Institut fur Normung), and is less than 0.1 g/m2. for 24 hours at 40 °C. OXYDEX layer in pipes Thermotech reliably protected from mechanical damage protective layer polyethylene. The melting point of the anti-diffusion layer is 180° C. These properties allow the use of such pipes at operating temperatures of the carrier up to 95°, and in short-term modes – up to 110° C, that is, mainly in hot water supply and heating systems, warm floors.
Oxygen penetrating the system does not cause any harm to the pipes themselves, it only reacts with metal parts systems, causing accelerated corrosion of heating boilers, pumps, radiators, shut-off and control valves and other metal equipment. This process is especially accelerated when using pipes in systems with elevated temperatures, i.e. in heating systems (especially radiator systems). Unfortunately, it is not included in SNiP permissible value oxygen penetration in systems made of plastic pipes. Therefore, in reality, pipes without a diffusion layer are often used, which after 5 years leads to the failure of the steel elements of the system. To prevent this from happening, it is necessary to use only pipes in heating systems that meet the requirements of the German standard DIN 4726. It should be noted that today only a few companies can offer pipes that meet the requirements of this standard.
This pipe can withstand high pressures. The service life of PERT pipes is determined by nomograms depending on temperature and pressure working environment(as well as all other polymer pipes). According to Russian certification, PE-RT pipes are classified as type “t” (heavy), i.e. withstanding pressure of 20 kgf/cm2.
The THERMOTECH brand produces 5-layer unreinforced pipes for heating and water supply systems:
- Thermotech Thermosystem PE-RT I diameters 8x1, 12x2 mm, 17x2 mm, 26x3 mm
- Thermotech MultiPipe PE-RT II diameters 16x2, 26x3,
- Thermotech Thermosystem PE-RT II diameter 20x2, 32x3 mm
Advantages of Thermotech pipe
Thermotech = reliable + easy to install + inexpensive!
Extreme flexibility and strength without the use of a crosslinker. The secret lies in the large number of carbon bonds in the molecules. To understand the difference, answer the question: what kind of shoes do you prefer to buy - with edging sewn to the sole (analogous to molecular cross-linking of polyethylene) or with a glued sole (analogous to chemical cross-linking of polyethylene or glued plastics)?
The service life of the pipe is over 50 years. It requires virtually no maintenance during operation, which further facilitates the work of public utilities.
Able to withstand high pressures and temperatures. The service life of PERT pipes is determined by nomograms (see appendix) depending on the temperature and pressure of the working medium. According to Russian certification, PE-RT pipes are classified as type “t” (heavy), i.e. withstand pressure 20 kgf/cm2
Polyethylene pipes are 5–7 times lighter than steel pipes. Pipes are produced seamlessly in standard coils 12 * 2.0 mm (1000 m), 16 * 2.0 mm (750 m), 20 * 2.0 mm (650 m), 25 * 2.3 mm (350 m), 32 *3.0 mm (50 m). This significantly reduces transportation costs and makes the work of installers easier.
The temperature linear expansion of PE-RT pipes is several times less than that of standard PEX pipes. When the temperature changes by 50°C, the linear elongation of PE-RT pipes is only 0.3%, and when the temperature changes by 90°C – 0.7%. When cooled, the pipe completely returns to its original shape.
Docking polyethylene pipes much cheaper, simpler and less time consuming. The pipes are connected using brass compression fittings and takes seconds. The entire installer's tool consists of pruning shears and a wrench. Therefore, even a non-specialist can change or install the plumbing himself.
No squeaking in underfloor water heating systems.
Due to the low surface roughness (0.125 microns), the pipes are not subject to overgrowing, therefore require virtually no maintenance during operation and are silent at almost any flow rate.
Frost-resistant and able to withstand several freeze-thaw cycles (for example, water).
It has high maintainability. Multiple joining and undocking of the fitting is allowed, while the pipe at the joint retains its properties.
Can be used for transportation food products, aggressive liquids and gases.
Fully meet the requirements of modern industry for the aesthetics of work and operation of pipelines.
Warranty periods: shelf life 3 years, service life 7 years.
The pipe is resistant to chemicals and mechanical wear.
Foreign certification.
The pipe was tested at SKZ (Suddeutsches Kunststoff Zentrum). According to SKZ tests, the service life of PERT pipe is 490 years with a safety factor of 2.5.
According to the TUV (Technisher Uberwaschungs – veren Bayern) conclusion, a pipe with an OXYDEX layer is not subject to oxygen diffusion (does not allow air to pass through).
The production has an international quality certificate ISO 9002.
Russian certification.
GOSSTROY OF RUSSIA No. 0130837*. Application in heating systems.
HYGIENE CERTIFICATES. According to test results at Polymertest LLC, the service life of the MIDI pipe is more than 100 years, depending on operating conditions.
ROSTSTANDARD. Application in DHW systems, HVS.
Certified for heating systems with operating coolant temperatures up to 95°, at peaks up to 110° C (no worse than any other polymer pipes), pressure up to 20 kgf/cm2 (!).
Pipes Thermotech Thermosystem® are manufactured in Germany by the HPG concern to order from Thermotech (Sweden).
DEVELOPER and MANUFACTURER of PE-RT compound Dowlex 2344 - "The Dow Chemical Company"
Materials and articles from "The Dow Chemical Company" in attachments:
- PE-RT, a new class of polyethylene for pipes hot water
- PE-RT, a new class of polyethylenes for industrial pipes
How do pipes for heated floors behave at subzero temperatures? We do not object to the use of pipes in conditions with low temperatures. Moreover, well-known facilities with PE-RT pipes have been operated without problems for years in arenas with artificial ice in Europe.
PERT pipes retain high strength and at temperatures down to -40°C.
The DOWLEX 2344E material, compared to other polymers, has a higher thermal conductivity at negative temperatures (2-3 times higher), which means the power of refrigeration units can be reduced.
IN Thermotech pipes the internal surface is mirror-like, they have a very low roughness (0.125 microns, class 10), this is less than that of PEX pipes and significantly less than any metal-plastic pipes. The fact is that in metal-plastic pipes the main load is borne by the aluminum layer and therefore the polymer layers in such pipes are of worse quality than in plastic pipes. Reducing hydraulic losses in Thermotech pipes will reduce the power of circulation pumps.
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A lot of objects have been made. For a very long time there were no competitive offers at all! No complaints.
Differences between pipes >>>
The IKAPLAST plant began producing pipes from polyethylene with increased heat resistance PE-RT. Standard sizes of PE-RT pipes with diameters from 63 to 630 mm. These pipes are intended for laying power cable lines trench and trenchless method.
IKAPLAST pipes made of PE-RT
Pipes for laying low-current, fiber-optic and other cable lines, with a diameter of 20 to 500 mm, are made of heat-resistant polyethylene black (PE-RT brand) with a red marking strip (by default). We can also apply a marking strip of a different color at the customer’s request. Pipes with a diameter of 160 mm to 630 mm can also be made of black polyethylene with increased heat resistance PE-RT, and have a protective sheath made of material resistant to mechanical damage.
Depending on the selected diameter, the pipe is marked and has red marking stripes (by default). We can also apply stripes of a different color at the customer’s request.
Regardless of the purpose and type, PE-RT pipes can be laid using trenchless and trench methods, and connected using fittings by welding.
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Pipe from |
SDR 13.6 |
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Nominal outside diameter, mm |
Wall thickness, mm |
Weight 1p.m., kg |
Wall thickness, mm |
Weight 1p.m., kg |
Wall thickness, mm |
Weight 1p.m, kg |
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Black polyethylene pipe with red marking strip |
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*If necessary, it is possible to produce pipes with a diameter of up to 630 mm.
It is also possible to produce pipes with SDR 7.4
IKAPLAST pipes made of PE-RT with a protective sheath for laying cable networks
Pipes with a diameter of 63 mm to 500 mm can also be made of black polyethylene with increased heat resistance PE-RT, and have a red protective sheath made of material resistant to mechanical damage. At the customer's request, we can produce a shell of a different color.
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PE-RT pipe with protective sheath |
Protective shell |
SDR 13.6 |
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Outer diameter, mm |
Thickness, mm |
Maximum deviation, mm |
Wall thickness, mm |
Weight 1p.m., kg |
Wall thickness, mm |
Weight 1p.m., kg |
Wall thickness, mm |
Weight 1p.m., kg |
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Black polyethylene pipe with a red protective sheath |
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| 63 | 0,8 | +0,5 | 3,8 | 0,913 | 4,7 | 1,07 | 5,8 | 1,25 |
| 75 | 0,8 | +0,5 | 4,5 | 1,25 | 5,6 | 1,47 | 6,8 | 1,70 |
| 90 | 0,9 | +0,4 | 5,4 | 1,75 | 6,7 | 2,06 | 8,2 | 2,43 |
| 110 | 0,9 | +0,6 | 6,6 | 2,56 | 8,1 | 3,01 | 10 | 3,55 |
| 1,0 | +0,6 | 7,4 | 3,24 | 9,2 | 3,87 | 11,4 | 4,59 | |
| 630 | 2,5 | +1,0 | 37,4 | 75,7 | 46,3 | 91,0 | 57,2 | 109,0 |
The operating temperature range of PE-RT pipes is from -20 to +95˚С, and can briefly withstand temperatures up to +110˚С. IKAPLAST pipes from PE-RT are manufactured according to specifications.
Pipes with a diameter of 20-630 mm. are made of black PE-RT polyethylene with a red marking strip*, pipes with a diameter of 63-630 mm can be made of black PE-RT polyethylene with a red protective sheath*.
Pipes with a diameter of 20-110 mm are produced in coils or straight sections, pipes with a diameter of 125-630 mm are produced only in straight sections with a length of 6.5 and 13 m (by default). We can also produce pipes of other sizes at the customer's request.
The PE-RT polyethylene pipes offered by the IKAPLAST plant belong to the class of products with increased heat resistance. Depending on the type, such pipes can be used for laying cable networks or hot water supply lines using trench and trenchless methods.
*At the customer's request, we can make marking stripes and casing of a different color.
General information about PE-RT pipes
PE-RT pipes are manufactured in accordance with technical specifications made of special polyethylene with increased heat resistance. This ensures a wide range of product operating temperatures ranging from - 20°C to +95°C. Short-term exposure to temperatures up to +110°C is allowed without any damage to the integrity or deformation of the existing pipeline.
Service life at correct installation and compliance with operating conditions exceeds 50 years.
Thanks to increased resistance to high temperatures PE-RT pipe can be successfully used to supply hot water to residential and industrial facilities. PE-RT pipes for cable lines are designed for laying and protecting high-voltage and other lines from mechanical and temperature influences. A protective polypropylene shell provides reliable protection cable from damage during installation and long-term operation.
Due to the flexibility of the heat-resistant PE-RT pipe (RT - resistance rise temperature), it can be laid using a small number of fittings. This significantly reduces the cost, speeds up and simplifies installation work.
A protective coating that is resistant to scratches and significant mechanical damage allows the PE-RT pipe to be laid using both trench and trenchless methods, and connected using fittings by welding.
Do you dream of comfort? Do you want a warm floor in winter, and in summer - cold ceiling and walls? All this can be achieved with modern polyethylene pipes: cross-linked PEX and heat-resistant PERT. They can be installed without the help of specialists with your own hands. Read the article about how to select and install polyethylene pipes.
1. What types of pipes are there?
There are 5 main types of pipes:
Steel or galvanized (ferrous metal - an alloy of iron with carbon and other elements)
Copper (non-ferrous metal)
Metal-plastic
Polypropylene
Polyethylene (made of cross-linked polyethylene)
Each of the above types has its own purpose and is suitable for certain methods of laying pipelines and the properties of the transported medium (maximum and minimum temperature and pressure).
Today, heavy, unaesthetic metal pipes are being replaced by lightweight metal-plastic, polypropylene and polyethylene pipes. They are different colors and do not require painting, they can be laid in any way - open, hidden or combined.
2. Purpose of cross-linked polyethylene pipes
XLPE pipes
Polyethylene pipes (PE) are used for:
- cold and hot water supply;
- low-temperature water heating (usually up to 80°-95C);
- water heated floors and walls;
- “cold panel” systems (an alternative to air conditioners that eliminates drafts and excess dust);
- cooling artificial ice skating rinks;
- soil heating in greenhouses;
- process pipelines for food and non-food liquids and gases, etc.
3. Advantages and disadvantages
Advantages:
low cost; a light weight; ease of installation; resistance to liquid freezing (if water freezes, the pipes will only stretch a little, and after thawing they will return to their previous size); absorption of noise and vibration during liquid transportation; reliability and long service life (up to 50 years or more) when used in low-temperature systems.Flaws:
low oxygen permeability of single-layer polyethylene pipes, which, through long time may lead to corrosion of system elements; reduced service life when used in high-temperature heating systems; instability to ultraviolet (solar) radiation when exposed for a long time.4. What are polyethylene pipes
Depending on the production technology, there are 3 main types of PE pipes:
- HDPE (polyethylene low pressure, its other common name is high-density polyethylene);
- MSD (medium pressure and density polyethylene);
- LDPE (polyethylene high pressure and low density).
The following materials stand out:
- PEX (cross-linked polyethylene);
- PERT (heat resistant polyethylene).
HDPE, PSD and LDPE pipes are manufactured under different pressures, which influence the process of ethylene polymerization (combination of small gas molecules into larger macromolecules).
PEX and PERT are made from HDPE and PSD using the “cross-linking” and “adhesion” technology.
Cross-linked polyethylene is produced from high-density polyethylene by chemically or chemically cross-linking its molecules. physically with “flat” butene molecules.
During the production of heat-resistant PERT, polyethylene molecules adhere together medium density with “bulk” octene.
Despite these differences, PEX and PERT materials have similar properties. Therefore, it is no coincidence that manufacturers lump them into one category (for example, you may see PEX and PERT pipes in the same section on plumbing company websites).
PEX and PERT pipes are:
- single-layer;
- multilayer.
In cross-section, multilayer pipes represent a three-layer or five-layer structure.
In a three-layer pipe, a layer of polyethylene is covered with glue, on top of which an anti-diffusion layer is applied, which prevents the penetration of oxygen and other gases into the water and thereby has an “anti-corrosion effect.” Polyvinylethylene EVOH or ethylene vinyl alcohol EVAL acts as an “oxygen barrier” that extends the service life of the system.
In a five-layer pipe, the anti-diffusion layer in the center is covered with layers of glue, on top of which layers of polyethylene are applied.
5. How to choose the pipe diameter
When choosing new pipes, pay attention to the size of the old ones. To replace it, you need to select a product of the same or slightly larger diameter.
For example, on your still existing metal pipes it is written “DN 15”: the number in this case means the internal diameter. And on modern polyethylene pipes, manufacturers indicate the outer diameter and wall thickness.
To calculate the internal diameter, you need to subtract the wall thickness multiplied by two from the size of the external diameter. For example, the plastic says 20x2.0. 20 – 4 (2.0x2) = 16 mm. This means that a polyethylene pipe 20x2.0 with an internal diameter of 16 mm is suitable for replacement steel pipe DN 15.
Table 1. Calculation of the internal diameter of plastic pipes of the most common sizes
6. Which pipes are best to buy?
To choose quality products, pay attention to the type of material (indicated on the pipes themselves, the label or in the product description on the website).
There are two types of PERT material – Type I and II. Type 2 PERT can withstand 20% higher pressure than the previous generation, i.e. Type I.
When comparing PEX and PERT, PEX is considered more durable because it can withstand high temperatures and pressure longer.
Usually the letters a, b or c are added to the PEX inscription, which indicates the method of cross-linking polyethylene and affects their quality. PEXa and PEXb are manufactured chemically, PEXc – physical, while the degree of crosslinking of PEXa reaches 75%, PEXb – 65%, PEXc – 60%. Testing of the latest polyethylene pipes three types of the same size at 90°C showed the advantage of PEXb.
In addition, the quality of the pipe depends on the thickness of its wall and the method of applying oxygen-impermeable layers.
Tests have shown that a three-layer pipe is more reliable than a five-layer pipe. In a three-layer pipe, the polyethylene layer is monolithic over the entire cross-section of the pipe; in a five-layer pipe, it is interrupted by an anti-diffusion layer and glue, due to which the intermolecular bonds of polyethylene are interrupted. If it overheats construction hairdryer delamination is possible during bending. The hardness of the EVOH layer is significantly higher than that of PEX, so if properly transported, damage and abrasion of the outer layer is unlikely.
Table 2. Comparative characteristics of PEX pipes from various manufacturers
| Manufacturer | Valtec | Pro Aqua | Rehau | Birpex | Royal Thermo | Uponor | TEBO technics | Sanha |
| Polyethylene material | PEXb, PERT type II | PERT type II, PEXa | PEXa | PEXb, PERT | PEXb, PERT type II | PEXa | PERT type II | PEXc |
| Number of layers, pcs | 1-3 | 1-5 | 1-3 | no data | 5 | 1-3 | 1-5 | 5 |
| Outer diameter, mm | 16-20 | 16-40 | 10,1-63 | 16-63 | 16-20 | 16-110 | 16-26 | 16-20 |
| Wall thickness, mm | 2 | 2,2-5,5 | 1,1-8,6 | 1,8-8,6 | 2,2 | 2-15,1 | 2-3 | 2 |
| Working pressure, bar | 6-10 | 6-10 | 8-10 | 6-10 | 10 | 6-10 | 10 | 6 |
| Maximum operating temperature, °C | 80-90 | 90 | 70-95 | 80-95 | 95 | 95 | 95 | 95 |
| Manufacturer country | Italy-Russia | Germany | Germany | Russia | Russia-Italy | Finland | Türkiye | Germany |
| Service life, years | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
| Manufacturer's warranty, years | 10 | 10 | 1 | 5 | 8-10 | 10 | 7 | 1 |
| Delivery method | bays | bays | bays | bays | bays | bays | bays mi | bays |
| Price for 1 linear meter, rub. | from 33 | from 26 | from 96 | from 43 | From63 | from 52 | from 68 | from 28 |
*Prices according to online sources are valid for February 2018.
To assess the applicability of pipelines to a specific system, pay attention to the declared operating classes of products according to GOST (and certificates of compliance with them). They will show the share of the influence of those changing in summer and winter periods temperatures at real time operation. Example:
Table 3. Reliability requirements for polyethylene pipes according to GOST R 52134-2003
| Operating class | T slave, °C | Time at T pa b, year | T max, °C | Time at T max, year | T avar,°C | Time at T emergency, h | Application area |
| 1 | 60 | 49 | 80 | 1 | 95 | 100 | Hot water supply (60 °C) |
| 2 | 70 | 49 | 80 | 1 | 95 | 100 | Hot water supply (70 °C) |
| 3 | 30 | 20 | Low temperature underfloor heating |
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| 40 | 25 | 50 | 4,5 | 65 | 100 | ||
| 4 | 20 | 2,5 | High temperature underfloor heating Low temperature heating with heating devices |
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| 40 | 20 | 70 | 2,5 | 100 | 100 | ||
| 60 | 25 | ||||||
| 5 | 20 | 14 | High temperature heating with heating devices | ||||
| 60 | 25 | 90 | 1 | 100 | 100 | ||
| 80 | 10 | ||||||
| HV | 20 | 50 | - | - | - | - | Cold water supply |
The following notations are used in the table:
T slave - operating temperature or combination of temperatures of transported water, determined by the area of application;
T max - maximum operating temperature, the effect of which is limited in time;
T avar is an emergency temperature that occurs in emergency situations when control systems are violated.7. Installation methods
There are three main ways to install wiring:
- Hidden;
- Open;
- Combined.
7.1. Hidden
With hidden installation, the pipeline and all connections are “hidden” in special recesses - grooves. Only fittings (connectors) and bends for connecting plumbing fixtures are visible from the outside. Upon completion of the work, the surface is sealed with finishing materials.
This method protects pipes from accidental damage and preserves aesthetic appearance interior However, this same installation option complicates the process (due to gating - laying channels), increases the cost of work and is not suitable for load-bearing walls.
TO hidden installation also applies to pipe coating concrete screed in "warm floor" systems.
7.2. Open
If the pipes cannot be hidden in the wall (for example, after a recent renovation), they can be laid on the surface. This option is convenient for visual inspection of connections and allows you to quickly clean the area or replace a component if necessary. Additional arguments in favor of the method are the ease and low cost of work.
7.3. Combined
The combined method involves laying unfinished walls on the surface, which are then covered with plasterboard boxes or false panels made of plastic, tiles or other materials.
For installation, one of two connection systems is usually used:
- sequential
- collector
At sequential system the pipe is laid from one object to another. This system is suitable for bathrooms with minimum quantity objects (bathtub, sink, washing machine).
IN collector system all control devices are located in a compact manifold, which is placed in a special cabinet. Using a collector simplifies the work process and saves money. Suitable for radiator wiring and underfloor heating.
Tips for installing polyethylene pipes
Installation tips:
Before starting work, consider how the pipes will be placed. Then, directly on the walls, floor or ceiling, use a pencil or marker to draw the lines of the future pipeline. Use the pipe connection to the faucet, radiator or manifold as a starting point.
If necessary, before concealed installation, insulate the fittings with film or the entire pipes with a special corrugated casing. Do not use sharp objects to unpack the coil, as they may damage the material.
Try to minimize the number of fittings that affect pressure stability. For convenience, during the installation of “warm floors” you can use special slabs or mats that facilitate installation and minimize heat loss.
If you decide not to use thermal insulation mats, use anchor brackets and 90°C rotation clamps, as the “molecular memory” of polyethylene pipes will prevent it from maintaining the specified shape.
The same memory effect will help restore the original shape of the PEX pipe in case of excessive bending and deformation: it is enough to heat it with a hair dryer to 100–120 ° C (the temperature depends on the material, it is indicated in the product data sheet).
8. What materials and tools are needed
1. Materials:
- fittings (crimp, press-on, plastic) - special connectors for branching pipes, turns, transitions to another diameter (read more about fittings below),
- fasteners - clamps, brackets, brackets, rotation locks and other elements that secure polyethylene structures to supporting surfaces (most often on walls).
So, you have decided to lay a polyethylene pipeline yourself. In addition to the pipes themselves, you will need:
2. Tools:
- pipe cutter or scissors (different manufacturers call this tool differently);
- electrical or mechanical expander;
- wrenches for compression fittings, a vice (also called a press or tension tool) - for fittings with a sliding sleeve (or press-on fittings).
9. Types of fittings
You can independently install cross-linked polyethylene pipes using three main types of fittings:
- crimp (they are also called compression or collet);
- press-fit (or fittings with a sliding sleeve);
- plastic.
The range of all types of fittings includes connectors various forms– straight (couplings), angles, angles, water sockets, tees, crosses, which can be divided into two types:
Since compression fittings require maintenance, they are ideal for open and combined installations. They are not suitable for installation in walls or heated floors.
Components of a compression fitting:
- body (fitting) with ring-shaped notches;
- split ferrule;
- screw.
How to proceed:
- Cut the pipe to the required length. scissors or pipe cutter.
- Place the nut on the section first (with the thread towards the connector), then the crimp ring. The edge of the ring should protrude approximately 1 mm above the cut.
- Insert the fitting into the pipe until it stops, tighten the ring and union nut to the edge of the cut.
The connection of pipes using a sliding sleeve is permanent, so such connectors can be used for any type of pipeline laying, even hidden.
Components for the sliding sleeve:
- frame;
- sleeve.
How to proceed:
- Cut the pipe to the required length using special scissors or a pipe cutter.
- Place the sleeve on a section away from the edge (it should not fall into the expansion area of the pipe).
- Insert the expander into the pipe and increase its diameter according to the instructions.
- Remove the expander and insert the fitting body into the pipe until it stops.
- Pull the sleeve onto the fitting using a vice.
Watch video instructions:
Watch video instructions:
10. What to do if you do not plan to install pipes yourself
In the online store Santekhmontazh.rf you can buy cross-linked polyethylene pipes from PEXb and PERT (type 2) of the Russian-Italian brand VALTEC and German ProAqua. They are adapted to the conditions domestic systems heat and water supply and have a 10-year manufacturer's warranty. ProAqua products have undergone comprehensive testing and are certified in accordance with Russian standards. VALTEC sanitary ware received the “Brand of the Year” award in the Russian Federation and is widely in demand in the country (in the Moscow region alone, more than 1,200,000 sq. m of residential space are equipped with it every year).
In addition to polyethylene pipes, you can purchase from us fittings, fasteners and tools for their installation, heat-insulating boards, manifold cabinets, blocks, etc.
We will help you select all the necessary plumbing equipment to suit your needs, and we will also quickly and professionally install it, if after reading this article you still do not dare to change or lay the pipeline system yourself. Our installation division specializes in installing engineering systems in private and apartment buildings, in non-residential buildings for various purposes.
» PE-RT pipes - characteristics of new pipes for plumbing
The popularity of PEX series plumbing pipes made of cross-linked polyethylene has suddenly been called into question. And it was done by none other than the manufacturer himself. The American company Legend recognized the undeniable popularity of PEX and at the same time noted the negative properties of this product. The PEX pipe series suffered from a serious operational drawback - residual traces of chemicals in the water. Plus, disposal and recycling promises a lot of difficulties. Therefore new plumbing pipes PE-RT, based on bimodal polyethylene, is confidently replacing the PEX series from the leading position in the plumbing market.
PE-RT series for plumbing
The American company Legend began producing innovative plumbing products that are functionally and technically more advanced back in 2015.
Polyethylene plumbing hoses for heating and hot water supply, marked with the “HyperPure PE-RT” brand, increase the efficiency and performance of the hydraulic system.