Polypropylene pipes for heating specifications which may differ from each other, are presented in a very wide range on the modern market. Their popularity is high, and there is a tendency towards its constant growth. This demand is explained by the ease of installation and the wide range of possibilities for their use: depending on the type, they are used from the usual installation of water supply to the creation of heating circuits. They certainly don't have much flexibility. metal-plastic pipes, but if necessary, they can be given a smooth bend.
Varieties polypropylene pipes– quite a few, and each of them has its own scope of application. To understand which type is most suitable for a heating circuit, you need to take a closer look at their structure and technical characteristics.
Criteria for choosing polypropylene pipes for heating
The heating system will last as long as possible without failures or repairs if the right components are selected for it that meet a number of specific requirements.
All elements and components of the heating system, even during normal operation, experience quite serious loads. These are, of course, very large temperature changes and pressure surges, which are also aggravated by the aggressive chemical effects of low-quality coolant, especially if the home (apartment) system is connected to central heating.
Polypropylene pipes are a rather ambiguous material, and are offered on sale in many types, differing in wall thickness, the presence or absence of reinforcement, material quality, resistance to temperature and pressure loads, ultraviolet exposure, and linear expansion characteristics. Therefore, when planning to update the heating system circuit, you need to know very precisely what qualities the pipe material should have.
Compare which ones are better from a new article on our portal.
For installation in a heating system, it is necessary to select polypropylene pipes that meet the following basic characteristics:
- Since the standard temperature of the coolant in a central heating system is usually 70–75 degrees, but sometimes it can be even higher, pipes for it must be selected so that their heat resistance has a certain margin, up to 90–95 degrees of heating. Pipes should not deform, bend, or “float” when heated at high temperatures, and their thermal expansion should not exceed certain limits.
- In addition to elevated temperatures, uncontrolled pressure surges and water hammer occur in the central heating system. They are especially likely during testing periods before the start of the heating season. Hence the conclusion - pipes must withstand high pressure loads.
- The material from which the pipes are made must be inert to aggressive substances that may be present in the coolant. The walls should not be subject to corrosion, and polypropylene fully possesses these advantages, therefore it is excellent for heating systems.
- In order to achieve normal coolant circulation throughout the circuit, without creating dirt plugs in it, the internal surfaces of the pipes must have ideal smoothness and maintain it in its original state for as long as possible. Unlike metal pipes, polypropylene will not be corroded by any of the known types of corrosion, and irregularities will not appear on their internal walls, in which dirt and limescale usually accumulate.
- The coefficient of thermal expansion of the pipe material for the heating system must be minimal, otherwise when heated on long straight sections the pipes will begin to sag.
- The service life of the pipes must be at least not lower than the service life for which other elements of the heating system are designed.
- It would seem that this is an insignificant characteristic, but it should also be kept in mind. When the coolant moves through the pipes, if they have an uneven internal surface, noise can be created that seems imperceptible at first, but gradually causes irritation. Polypropylene is able to ensure almost silent circulation of liquid, unlike metal, since strong turbulence and, therefore, resonant sounds are not created in polymer pipes.
- A circuit made of polypropylene pipes is always more aesthetically pleasing than a metal one, and does not require periodic painting.
Modern polypropylene pipes are produced using modern technologies production of plastic and composite materials, and the additional equipment of some varieties with reinforcement makes them ideal for heating systems. Thus, polypropylene pipes for systems in contact with hot water, are manufactured in multilayer versions with a reinforcing layer, which significantly reduces thermal expansion and makes the walls more durable.
For example, polypropylene pipes of the Lammin brand for use in heating systems, cold and hot water supply, as well as process pipelines for liquids and gases that are not aggressive to the pipe material. Production is carried out according to GOST 32415-2013, in three versions:
- single-layer;
- fiberglass reinforcement;
- aluminum reinforcement.
Lammin pipes and fittings are produced only from primary raw materials from leading suppliers. This is an important advantage when choosing. The quality of raw materials greatly influences the quality finished products, which undoubtedly affects the durability of heat and water supply systems. Subject to regulatory requirements during the design, installation and operation process, polypropylene pipes can last up to 50 years without requiring repairs or complex maintenance.
When choosing polypropylene pipes for organizing or repairing heating and water supply, you need to ensure the environmental friendliness and quality of the products. It is important that not only finished products, but the raw materials were also certified for compliance with Russian standards, and the absence of defects in the batch was controlled by quality control specialists. It is this approach to production that is supported by the LAMMIN plant, one of the leading enterprises producing polypropylene products in Russia.
Lammin polypropylene pipes undergo mandatory testing in the plant’s own accredited laboratory, as well as in laboratories of independent organizations. The integrity of the manufacturer gives the consumer the opportunity to purchase high-quality pipes that are responsible for the reliability and durability of the engineering system.
Please ensure that the pipe is marked! It is through marking that the manufacturer transmits to the consumer all the necessary technical information: brand, color, material, type, pressure, production date and other parameters.
One of the most important parameters when choosing, determining the purpose of a polypropylene pipe, is the PN parameter - this is the designation of the nominal pressure. Pipes different types have different PN indicators! Since in different engineering systems, be it heating, cold or hot water supply, liquid carriers are supplied at different pressures, the pipe must strictly comply with this indicator. Otherwise, the system is at risk of rupture and leakage.
Based on the type determined by PN, the following types of polypropylene pipes are distinguished in the Lammin assortment:
- PPR PN10 pipes (single-layer). The pipes are designed for low pressure liquid carrier, which is supplied in low-rise buildings (one or two floors). Due to the lack of additional reinforcing layers, this pipeline option is not used for heating or hot water supply.
- PPR PN20 pipes (single-layer). They have thicker walls than the previous type, which means the pressure for which the pipe is designed will be higher. As for the purpose, use for hot water supply will be optimal.
- PPR pipe PN20 (fiberglass). Designed for the same pressure as the previous one, but equipped with an additional layer of fiberglass reinforcement. This layer makes the polypropylene pipe more resistant to high temperatures, which means that this type can already be used for heating in low-rise buildings, as well as in hot water supply pipelines. Additional benefit– increased flow area compared to the previous type.
- PPR pipe PN25 (fiberglass). Multilayer and high PN parameter make it possible to use this type of pipe for organizing heating systems in apartment buildings with central heating, where pressure and temperature are higher than in low-rise buildings, as well as in hot water supply systems.
- PPR pipe PN25 (aluminum layer). Particularly durable polypropylene pipes due to aluminum reinforcement. This layer prevents deformation of the pipe from constant contact with a very high temperature coolant. Purpose – heating systems. Installation of such pipes requires professional knowledge and experience.
Before purchasing, study information about the manufacturer, types and purpose of polypropylene pipes so that the engineering systems in your home are reliable and durable!
Please note that to connect the pipes you will need fittings and welding equipment (if you install the system yourself). Lammin has both.
Installation of both reinforced and non-reinforced pipes is carried out using fittings. Soldering and joining polypropylene pipes is a process that requires care and precision. It is prohibited to solder the same parts twice (after making a technological error), however low cost products allows novice craftsmen to thoroughly practice on samples before assembling a heating or water supply system in an apartment, house, or country house.
Prices for polypropylene pipes
Valfex polypropylene pipes
Since the duration of trouble-free operation and the quality of polypropylene pipes for heating and hot water supply systems directly depends on the composition of the materials from which they are made, various options should be considered.
Types of polypropylene pipes
Polypropylene (accepted international designation - PP) has been used for quite a long time for the manufacture of pipes as a base material. However, only the development of modern technologies has made it possible to obtain such products that can be used for hot water supply and heating systems.
Polypropylene itself is characterized by its pronounced inertness to the chemical effects of a possible liquid coolant medium. However, in terms of heat resistance and strength, different types can differ significantly from each other.
So, pipes made of this material are divided into three main types, which have their own designations:
- RR-N - This is the first type of polypropylene pipes, inert to chemical influences, but not resistant to elevated temperatures. Therefore, they are designed for cold water supply, sewerage, drainage systems, ventilation and for other applications where elevated temperatures are not expected. Very often, this type of pipe is prevalent for industrial production lines, as it is highly resistant to increased internal pressure.
The range of possible applications of PP-V pipes is somewhat wider, but for heating they are still “weak” - RR-V- this is the second type of polypropylene pipes, which has all the same advantages of PP-N, but, in addition, has the ability to withstand temperature loads of low amplitude. Therefore, they can be installed on separate main sections of “warm floor” systems. And also in hot water supply circuits, provided that the water or coolant does not heat above 50 degrees.
However, the main scope of application of RR-B is different. Most often, such pipes go to sewer systems, since the material from which they are made has a sufficient degree of impact strength and heat resistance for this area.
- PPRC, PRR or PP-3- this is the most advanced type of pipes that is used in hot water supply and heating systems, that is, where temperatures can exceed 50 degrees and there is a possibility of increased compression loads. Increased heat resistance and mechanical strength is achieved thanks to special production technologies, in which, during synthesis, ethylene molecules are introduced into the molecular lattice of propylene.
PPR - pipes that are most widely used in living conditions, since they have a pronounced resistance to internal pressure and temperature changes.
Polypropylene pipes (PPR), used in domestic conditions, in turn, are divided into several types, depending on resistance to baric loads: PN -25; PN -20; PN -16; PN -10. Their main characteristics are given in the table:
| Type of polypropylene pipes | Nominal operating pressure | Scope of pipe use | |
|---|---|---|---|
| MPa | technical atmospheres (kgf/s²) | ||
| PN-10 | 1 | 10.21 | Connection to the "warm floor" circuit, the coolant in the system of which has a temperature of no higher than 45 ° C, or cold water supply. This type of pipe is designed for a system pressure of no more than 1 MPa. It is the most affordable due to its rather low performance characteristics. |
| PN-16 | 1.6 | 16.32 | Cold and hot water supply with a temperature of no more than 60˚C and a pressure of no more than 1.6 MPa. |
| PN-20 | 2 | 20.40 | Cold and hot water supply in an autonomous system with low pressure and no water hammer. The coolant temperature for this type of product should not exceed 80˚C, and the pressure should not exceed 2.0 MPa. |
| PN-25 | 2.5 | 25.49 | Hot water supply and heating with coolant up to 90÷95˚С, including in the central heating system. The pressure for which they are designed is 2.5 MPa. |
Each type of pipe is produced in a fairly wide range of diameters, internal and external: on which the wall thickness depends
| Outer diameter, mm | PN-10 | PN-16 | PN-20 | PN-25 | ||||
|---|---|---|---|---|---|---|---|---|
| Internal Ø, mm | Thickness walls, mm | Internal Ø, mm | Thickness walls, mm | Internal Ø, mm | Thickness walls, mm | Internal Ø, mm | Thickness walls, mm |
|
| 16 | - | - | 11.6 | 2.2 | 10.6 | 2.7 | - | - |
| 20 | 16.2 | 1.9 | 14.4 | 2.8 | 13.2 | 3.4 | 13.2 | 3.4 |
| 25 | 20.4 | 2.3 | 18 | 3.5 | 16.6 | 4.2 | 16.6 | 4.2 |
| 32 | 26 | 3 | 23 | 4.4 | 21.2 | 5.4 | 21.2 | 3 |
| 40 | 32.6 | 3.7 | 28.8 | 5.5 | 26.6 | 6.7 | 26.6 | 3.7 |
| 50 | 40.8 | 4.6 | 36.2 | 6.9 | 33.2 | 8.4 | 33.2 | 4.6 |
| 63 | 51.4 | 5.8 | 45.6 | 8.4 | 42 | 10.5 | 42 | 5.8 |
| 75 | 61.2 | 6.9 | 54.2 | 10.3 | 50 | 12.5 | 50 | 6.9 |
| 90 | 73.6 | 8.2 | 65 | 12.3 | 60 | 15 | - | - |
| 110 | 90 | 10 | 79.6 | 15.1 | 73.2 | 18.4 | - | - |
Naturally, the values of diameters and wall thicknesses directly affect the resistance of pipes to temperature and pressure, which, in principle, determines the duration of their possible operation in certain conditions:
| Coolant temperature ˚С | Service life, years | Pipe type | |||
|---|---|---|---|---|---|
| PN-10 | PN-16 | PN-20 | PN-25 | ||
| Permissible excess pressure (kgf/cm²) | |||||
| 20 | 10 | 13.5 | 21.7 | 21.7 | 33.9 |
| 25 | 13.2 | 21.1 | 26.4 | 33 | |
| 50 | 12.9 | 20.7 | 25.9 | 32.3 | |
| 30 | 10 | 11.7 | 18.8 | 23.5 | 9.3 |
| 25 | 11.3 | 18.1 | 22.7 | 28.3 | |
| 50 | 11.1 | 17.7 | 22.1 | 27.7 | |
| 40 | 10 | 10.1 | 16.2 | 20.3 | 25.3 |
| 25 | 9.7 | 15.6 | 19.5 | 24.3 | |
| 50 | 9.2 | 14.7 | 18.4 | 23 | |
| 50 | 10 | 13.9 | 17.3 | 23.5 | 21.7 |
| 25 | 8 | 12.8 | 16 | 20 | |
| 50 | 7.3 | 11.7 | 14.7 | 18.3 | |
| 60 | 10 | 7.2 | 11.5 | 14.4 | 18 |
| 25 | 6.1 | 9.8 | 12.3 | 15.3 | |
| 50 | 5.5 | 8.7 | 10.9 | 13.7 | |
| 70 | 10 | 5.3 | 8.5 | 10.7 | 13.3 |
| 25 | 4.5 | 7.3 | 9.1 | 11.9 | |
| 30 | 4.4 | 7 | 8.8 | 11 | |
| 50 | 4.3 | 6.8 | 8.5 | 10.7 | |
| 80 | 5 | 4.3 | 6.9 | 8.7 | 10.8 |
| 10 | 3.9 | 6.3 | 7.9 | 9.8 | |
| 25 | 3.7 | 5.9 | 7.5 | 9.2 | |
| 95 | 1 | 3.9 | 6.7 | 7.6 | 8.5 |
| 5 | 2.8 | 4.4 | 5.4 | 6.1 | |
The data presented in the tables is the result of long-term testing of pipes in different conditions, which even theoretically can arise during their operation, so it is worth taking them into account in the process of selecting the necessary material.
Polypropylene pipes may have different colour, but when choosing them you should not pay special attention to it (perhaps only from an aesthetic point of view) since the external color does not in any way determine the characteristics of the products and does not affect their quality.
A red or blue stripe may be applied to the surface of some pipes - it serves as a specific indicator of the purpose of a particular type. Thus, blue color is applied to cold water supply pipes, and red indicates the ability of the products to withstand elevated temperatures in the hot water system or heating circuit.
In addition to colored stripes, the pipes are marked with letters, which indicate their characteristics and intended purpose for installation in certain water supply or heating systems, and you also need to pay attention to it. The meaning of the marking indicators corresponds to the information given in the tables.
As can be seen from the presented characteristics, PN-20 products are optimally suited for the heating system, but the ideal option would still be PN-25 pipes, which have pronounced resistance to elevated temperatures and pressure, even with a good margin.
Reinforced polypropylene pipes
Due to the fact that “pure” polypropylene itself does not have a pronounced resistance to elevated temperatures and expands significantly when heated, reinforcement is used for pipes used in systems where contact with hot water is implied. Several materials are used to strengthen these products - aluminum foil, fiberglass or a composite mixture.
- Reinforcement of a polypropylene pipe can be carried out with a layer of solid or perforated aluminum foil having a thickness of 0.1÷0.7 mm, which is placed between layers of the base material and fixed with a layer of special glue.
Their durability will also depend on the characteristics of the adhesive composition used in the production of pipes, since in low-quality products, delamination of the walls can occur, where moisture will inevitably penetrate, which will negatively affect the overall strength of the pipe, significantly reducing its service life.
In addition, pipes differ in the area where the reinforcing layer is located.
Thus, the aluminum layer can be located in close proximity to the outer surface of the pipe or located closer to the middle of the wall thickness.
In addition to the fact that the aluminum layer significantly reduces the thermal expansion of polypropylene pipes, it helps protect the coolant from the penetration of oxygen from the surrounding air into it, since the polymer itself does not have such qualities.
If pipes that do not have such protection are installed in an autonomous heating system, then with the constant penetration of oxygen into the coolant (diffusion effect), corrosion processes on the metal elements of the circuit, including in the boiler structure, can be activated. Oxygen also promotes the appearance of aerobic bacteria, which will multiply over time, clogging the internal space of the pipes with waste products, which will significantly slow down the circulation of the coolant.
Many manufacturers of polypropylene pipes, trying to get rid of these shortcomings, use metal or chemical-organic layers.
If there is an aluminum layer in the pipes, the marking PP-RCT-AL-PPR is placed on their surface, which indicates that several materials were used in this product:
— PP-RCT is a random copolymer or modified polypropylene with high thermostatic properties;
— AL - reinforcing aluminum layer;
— PPR - outer polypropylene layer;
- adhesive layers.
- Another reinforcement option that restrains thermal linear expansion is glass fiber, which is laid between two layers of polypropylene. However, this reinforcing material is not able to protect the coolant from the penetration of oxygen into it.
If the pipe is reinforced with a layer of fiberglass, the letter designation PPR-GF-PPR and PPR-FR-PPR is installed on its surface. As can be seen from the markings, this type of pipe consists of three layers - outer and inner propylene (PPR) and middle fiberglass (GF). Fiberglass can only be located in the middle between layers of polypropylene.
The same can be said about composite material, which consists of fiberglass mixed with propylene. If you look at the internal structure of the pipe in cross-section, you will notice that its walls are monolithic, only different in color. The effect of their integrity is created thanks to reliable layers, which prevents their delamination.
The table below provides information on the specific features of single-layer and multi-layer polypropylene pipes in terms of linear temperature expansion and the degree of oxygen diffusion:
| Types of polypropylene pipes | Designation | Coefficient of thermal expansion, m×10⁻⁴/˚С | Oxygen diffusion indicators, mg/m²× per day |
|---|---|---|---|
| Single layer pipes: | |||
| PPR | 1.8 | 900 | |
| Multilayer pipes: | |||
| Polypropylene, glass fiber reinforced. | PPR-GF-PPR | 0.35 | 900 |
| Polypropylene, reinforced with aluminum. | PPR-AL-PPR | 0.26 | 0 |
From the above, we can draw a logical conclusion that the most the best option for the heating system there will be PN -25 pipes made using a reinforcing layer from a single sheet of aluminum. This design has minimal linear expansion and maximum oxygen diffusion.
Installation of polypropylene pipes
To install the heating circuit, you will need not only the optimal type of polypropylene pipes themselves, but also various connecting elements - these are angles, tees, bushings, holders, adapters, threaded fittings and other parts. All these components are purchased simultaneously with the pipes and are matched to them according to their outer diameter, according to the developed heating circuit diagram.
In addition, you will need a special welding machine with nozzles supplied with it, necessary for installing pipes different diameters. Such a device is not cheap, so if you do not plan to do such work in the future, you can rent it for a few days.
This photo shows a kit consisting of a soldering iron and all the necessary attachments and additional elements. On the heating sword-shaped part, small holes are clearly visible for installing working elements - a mandrel and a coupling, with the help of which the pipe sections and connecting parts will be heated before fastening. The set of tools often also includes special scissors (cutter), which can easily help you cut pipes of different diameters.
In addition to this set, you need to prepare measuring tools - a tape measure, a building level, a mark. May be required construction hair dryer, with the help of which, if necessary, it will be possible to give smooth curved shapes to individual sections of the pipe.
Pipes can be given bends by heating them with a hairdryer. But you shouldn’t get carried away with this - it’s better to use specialized components For work, you must have protective construction gloves on hand, since when working with a soldering iron or hair dryer, which heats up to very high temperatures, you can get a very serious burn.
Prices for Kalde polypropylene pipes
Kalde polypropylene pipes
To prepare for welding pipes with aluminum reinforcement, will be necessary special tool– Shaver. It can be in the form of a screwdriver attachment or manual.
Manual shaver - a tool for stripping pipes with aluminum reinforcement To understand how this happens, you need to consider it step by step using a specific example.
- The installation of the circuit is carried out according to a pre-drawn diagram.
In accordance with the drawing and control measurements carried out “on site”, pipe sections are cut using special scissors required length. In addition, all connecting elements are prepared and laid out - taps, bends, tees and other shaped parts. If necessary, areas that will heat up should be degreased and wiped with alcohol for better adhesion of the material.
- On both sides of the working part of the soldering machine, pairs of heating elements are installed - couplings and mandrels, having dimensions corresponding to the diameter of the selected pipes. The soldering iron, as a rule, has holes for heating two or even three pairs of elements, therefore, if the circuit is supposed to use pipes of different diameters, you can immediately install the appropriate nozzles.
- Next, the soldering iron is turned on for heating, and the desired temperature is set on its thermostat - for polypropylene, 260÷265 degrees is considered optimal. Some devices are already equipped with regulators that indicate the temperature for welding pipes made of certain materials.
- When the device reaches the desired temperature, the heating indicator light should turn off.
- If the circuit will be mounted from a PN-2о and PN-25 pipe, which has aluminum reinforcement, then the edges must be cleaned of the top thin layer of polypropylene and foil.
Stripping is carried out at a distance from the edge, which will be equal to the penetration depth. Usually the shaver is designed for this installation length. The pipe is inserted into the cutting part of the shaver, then it is rotated, gradually removing the layer of polypropylene and aluminum. The result is a cleaned area that exactly corresponds to both the mounting length for soldering and the required diameter.
For pipes that do not have reinforcement, or are reinforced with fiberglass or a composite composition, such stripping will not be required. On them, you only need to mark the depth of penetration with a marker.
The table below shows the main parameters for welding polypropylene pipes:
| Pipe outer diameter in mm | Pipe heating depth during welding, mm | Warm-up time of mating parts, seconds | Time from joining the elements to complete polymerization of the seam, minutes |
|---|---|---|---|
| 20 | 14÷16 | 6 | 2 |
| 25 | 15÷17 | 7 | 2 |
| 32 | 16÷20 | 8 | 4 |
| 40 | 18÷22 | 12 | 4 |
| 50 | 20÷25 | 18 | 4 |
| 63 | 24÷30 | 24 | 6 |
| 75 | 26÷32 | 30 | 6 |
| 90 | 29÷35 | 40 | 8 |
- It is recommended to immediately determine the relative position of the parts. For relax further work you can put a corresponding longitudinal mark with a marker - when final assembly All that remains is to combine the marks.
- When the soldering iron is completely warmed up, the prepared section of pipe is inserted into the coupling (to the depth of the stripped area or to the penetration depth mark), and one of the connecting parts is put on the mandrel until it stops. The elements must be heated evenly.
Therefore, the time indicated in the table presented above must be recorded. After this time, the elements are quickly removed from the soldering iron and perfectly smoothly connected to each other - the pipe is inserted into the connecting part to the heating depth and held in this position for approximately 15-20 seconds until the connecting unit sets.
Prices for popular polypropylene pipes
- The connected elements cannot be rotated relative to each other, since they must copolymerize and not be screwed into one another.
- Sometimes, the circuit is mounted in blocks, which are assembled on a table and then connected to each other at the installation site of the heating system.
- The work must be carried out extremely carefully, since if the connection fails, it can only be corrected by cutting off a section of pipe and installing a new unit. Therefore, before you start installing the circuit, it’s worth practicing, “getting into your hands” - for this it is recommended to purchase a few extra couplings or corners.
- If any connecting unit gives rise to certain doubts, then it is better not to take risks, but to remake it - shaped parts are inexpensive, and if the system is not fully assembled, replacing one unit should not present any difficulties.
The main reasons for choosing polypropylene pipes for the heating circuit
The reasons, which, in fact, are the advantages of polypropylene pipes are as follows:
- Polypropylene has a distinctly low weight, which greatly simplifies its delivery to the work site and installation itself - no special devices or equipment are required.
- If you have the necessary tools, polypropylene pipes are easy to install, and the techniques can be learned very quickly.
- The manufacturing material is absolutely harmless for residential premises, since it does not change its chemical composition even with strong heating, it does not emit toxic fumes into the air.
- Thanks to the stabilizers included in polypropylene, pipes can withstand water hammer and thermal loads, and even freezing of water inside without rupture.
- The smooth inner walls of the pipes promote uniform, turbulence-free and noise-free circulation of the coolant.
- Both the pipes themselves and their components are inexpensive. A wide selection of components allows for installation of a circuit of any complexity.
A little training and any owner can carry out independent installation - A circuit made of high-quality pipes, if installed correctly, will last at least 20–30 years.
- The aesthetic appearance of the pipes makes it possible not to spoil the interior, and the contour itself usually does not require either painting or additional decoration.
So, polypropylene pipes with a reinforcing aluminum layer are excellent for heating circuits of autonomous and central systems. In addition, the installation of this material is quite simple and feasible even for people who have no experience in such work. After several training sessions on the installation of individual components, the assembly process of the entire circuit can be carried out on your own.
Video: useful information on choosing polypropylene pipes and components
Polypropylene and polyethylene pipes are widely used in many construction fields. This material has proven itself in heating, plumbing and sewerage systems. PVC products are easy and pleasant to work with; their installation does not require special, expensive tools or devices. Before choosing pipes, you need to study their characteristics, sizes and scope of application. For example, when carrying out water supply, you should not use sewer samples, but it is better to buy special ones. For each case, elements with specific markings are suitable, in which precise information is encrypted.
Pipe marking
If you are planning to carry out heating in a private house with your own hands, choose only pipes marked PRR!
Characteristics of PPR plastic
Pipes marked with the abbreviation PPR have the following characteristics:
Types of polypropylene pipes
Solid plastic pipes are the cheapest Monolithic products are made of solid PVC, the expansion coefficient is 0.15%. They can only be used when installing systems in which a substance with a low temperature moves, for example, for ventilation and cold supply.
At water temperatures above 10C°, the use of these pipes is simply impractical - they will not withstand and may crack or burst. This must definitely be taken into account.
Reinforced polypropylene pipes
Aluminum is used to reinforce plastic products. Layers additionally reinforced with aluminum can be located on the outside, in the form of thin foil, or on the inside, in the form of point perforations. Perforation is applied in the form of a mesh with holes. During the casting of a product, the viscous material, entering the holes, creates a tight adhesion of the polymer to the metal alloy.
Reinforced polypropylene pipes are the most reliable Thanks to this type of strengthening, the system can withstand coolant heated to 90C°. It must be taken into account that installation and welding of aluminum-reinforced products can be complicated by the fact that they do not always correspond to the depth of insertion into the fittings and require additional stripping and removal of the top foil.
Fiberglass pipes
This product consists of two layers of plastic and a middle layer containing fiberglass. Plastic elements reinforced with glass do not require cleaning or calibration during installation. Soldering is quick and easy, which significantly reduces time and financial costs.
Glass increases rigidity, element density and service life. The disadvantage of such pipes is considered to be thermal elongation indicators, which are significantly higher than the same indicators for products reinforced with aluminum.
Operation of plastic pipes with fiberglass in different coolant temperatures Metal-plastic pipes
Metal-plastic products are equipped top layer made of PVC and internal made of aluminum. Such samples are able to withstand very high temperatures and can be used for heating and water supply of a private home. The disadvantage of elements made of metal-plastic is that the metal layer, being in contact with the transported substance, may be susceptible to corrosion.
Fitting
Fittings are parts for connecting elements in a pipeline. They are necessary for the arrangement of any engineering communications. Due to the fact that there are various models of polypropylene accessories with chrome and brass inserts on sale, you can easily choose those that are most suitable for installing various plumbing fixtures. For installation you will need a welding machine.
The size of the connecting parts is directly related to the size of the heating pipes. Knowing the diameter of the main element, you will immediately understand which connecting part you need to buy.
Products come in several diameters:
Very often there is a situation when the diameter indicated on the package does not correspond to reality! It is best to buy fittings in stores rather than at construction markets - there is much less defect there.
Types of connecting elements
There can be several connecting elements, in addition to fittings:
- coupling- a detail in the form of a ring. It is designed to fasten two pipes. Inner size the coupling must correspond to the outer size of the main part;
- Adapter– a fitting in the form of a barrel with a ring of smaller diameter. Adapters come with internal and external threads. Diameter transitions are simply necessary to connect the riser with horizontal heating distribution pipes;
- Corner. From the name it is clear that the element is curved at an angle. It is needed to form a corner joint between the pipes. Some craftsmen refuse corners and prefer to heat the plastic to 140C° and give it the desired bend. This can reduce the capacity of the water supply and increase the possibility of leaks. The corners are produced with a bend of 45 or 90C°. Threaded parts are often used for mounting heated towel rails or radiators;
- Cross and tee. Very often it is necessary to mount several system components together. The cross connects the branches of the four guides to the sides; accordingly, three branches can be made on the tee. Both parts can be without threads or with threads for different types of pipes;
- Contours. Often, during heating, there is a technological obstacle along the way that needs to be circumvented. In this case, contours are used. They make it possible to change the trajectory of the pipe without violating its integrity;
- Temperature compensators. This simple, flexible design, which looks like a folded loop, performs the desired function. When the temperature and pressure of water in the pipes sharply increases, this important part compensates for the expansion within the pipeline system. The device is easily mounted into the structure and increases its durability without leaks.
Types of fittings for plastic heating pipes
Video
You can watch a short video on how to choose the right polypropylene pipes and fittings for them.
One of the varieties plastic communications are polypropylene pipes for heating. Reviews from professionals, knowledge of the main characteristics of the presented products will help you choose suitable option in accordance with operating conditions.
general characteristics
Various plastic products gradually replaced metal communications. Modern production offers several options for pipes made of this material, each of which has its own characteristics.
When planning a renovation or building a new home, the question arises: Which polypropylene pipe should I use for heating? Such products are marked with the letters PPR. They include several varieties. In addition to polypropylene, the category of plastic products includes pipes made of polyethylene (PERT) and metal-plastic (PEX-AL-PEX).
Polypropylene differs in technical characteristics and installation features. This is one of the best, durable materials. There are several groups of polypropylene communications. Today it became possible installation of heating from polypropylene pipes. New technologies have made it possible to use various reinforcement methods in the production of such products. This significantly expands the scope of application of the material.
Reinforcement
Today is one of best solutions. It should be noted that polypropylene belongs to the category of materials that are deformed when exposed to high temperatures. Therefore, products made exclusively from a polymer alloy cannot be used for such purposes. Such pipes are used for cold water supply systems that are not characterized by high pressure.
To give polymer products the necessary resistance to high temperatures and prevent deformation, special reinforcement is added to their design.
An additional component is introduced into the wall of a polypropylene product: aluminum foil, fiberglass or basalt fiber. The strength and durability of the system depends on this component. Information about the material used for reinforcement must be indicated in the markings on the surface of the product.
Types of heating pipes
Regardless of the type of additional material, it can be used to feed hot water according to the system. Fiberglass and basalt thread are melted with the polymer during the production process. Aluminum is fixed to the polypropylene wall using special glue. The metal has perforations. This allows the connection between the inner and outer layers of the polymer to be maintained.
Reinforced polypropylene pipes, regardless of the material chosen to strengthen the structure, have a certain structure. The inner and outer layers are made of polymer. In the center, a certain reinforcement material passes between them.
When heated, all-polymer pipes elongate and sag. differs due to its special design with increased rigidity. The most effective in this case are aluminum and basalt fiber. They reduce the deformation factor of the product by 3 times. Their price will be higher than that of fiberglass pipes.
Advantages
Polypropylene pipes and fittings for heating have many advantages over other materials. They have a wide range of applications. Transporting elements of polymer communications is not difficult. The pipes are lightweight. They are also easy to install.
Polypropylene communications are unpretentious in operation. They provide high tightness of joints. The surface of the material is not subject to corrosion and does not need to be painted. Fungi, various bacteria and other microorganisms do not multiply on polypropylene, and mineral salts are not deposited on the walls.
Polypropylene belongs to the category of materials that are safe for the environment and human health. There is no vibration during the movement of fluid through the system. Polypropylene does not transmit electricity and is resistant to various mechanical and chemical influences. It is also a highly flammable material that does not deform even at a temperature of 120ºC.
Flaws
Considering characteristics of polypropylene pipes for heating, it is necessary to pay attention to negative qualities similar products. One of the disadvantages of the material is the risk of deformation. Low-quality products from dubious manufacturers can significantly elongate when heated. Therefore, it is worth purchasing communications from trusted brands. Such companies use quality materials for reinforcement.
Although polypropylene belongs to the category of highly flammable polymers, it is not used in enterprises. In the event of a fire, this material will melt and, at very high temperatures, may even burn. Therefore, polypropylene is intended exclusively for private construction.
The pipes cannot be bent during installation. Therefore, all turns will need to be performed using fittings. This is additional. Over time, the mechanical strength of polypropylene decreases. You will need to protect it from impacts.
Specifications
Choosing the best polypropylene pipes for heating, you need to pay attention to their technical characteristics. The main parameters are indicated on the surface of the products and are included in the labeling.
PN20 and PN25 pipes are suitable for heating. They are designed for temperatures up to 120ºС. However, all heating systems do not heat water above 95ºC. If the coolant begins to boil, this causes an emergency situation. In the event of an accident, the presented pipes have a certain safety margin.
Polypropylene category PN20 can withstand a system operating pressure of 20 atm. when heating the coolant to 20ºС. If the temperature reaches 90ºС, the strength of the material decreases. In such conditions it is capable of withstanding pressure up to 6.5 kgf/cm². Therefore, for large areas in the northern regions of our country, it is recommended to purchase pipes of the PN25 category.
Application area
Possible at various sites. This is a fairly versatile material. It is used to create various boiler installations.
Polypropylene pipes are suitable for installation of both cold and hot water supply. One of the main areas of application is the installation of central heating systems. Also, for private real estate, in country houses, cottages and dachas, heating systems are created using polypropylene.
In addition, reinforced polymer communications are suitable for agricultural enterprises. They are used to irrigate crop areas and create drainage systems. In industrial production, the presented material is suitable for creating routes when moving chemicals and compressed oxygen.
Manufacturers
Reviews from professionals about polypropylene pipes for heating will allow you to select high-quality reinforced materials. Experts advise giving preference to products from European brands, in particular, German companies Wefatherm, Banninger, Rehau, Aquatherm.
The presented manufacturers are constantly improving their technologies. This allows products not only to fully comply with existing building code requirements, but also to significantly exceed them. The cost of their products remains consistently high and is paid off by the long service life of the pipes.
Czech varieties of reinforced polypropylene, produced by the company Ekoplastik, are also in demand. The company uses basalt thread to create its products. The cost of this polypropylene is lower than that of German brands.
Diameter
Developing heating scheme with polypropylene pipes, it is necessary to take into account the diameter of such products. This important parameter, which must be paid attention to during the system installation process.
Pipes with the largest diameter (from 200 mm) are used for multi-apartment buildings. Also, the presented products are suitable for large municipal facilities, shopping centers, hotels, etc.
In private construction, it is not practical to use such pipes; it is more reasonable to use products with a cross section of 20-32 mm. They are characterized by high throughput. If the system is connected to central heating, the diameter of the pipes should be about 25 mm.
If a heated floor system is being installed in a private house, total area which is small or medium, communications with a cross section of 16 mm are used. For large cottages In this case, it is recommended to use 20 mm pipes.
Fitting
Mounted using fittings. On the market building materials a wide selection of adapters, turns and other structural elements. They may differ in diameter and structure.
Existing fittings can be divided into two categories. The first group includes products made from the same material as pipes. They are assembled using diffuse welding. To do this, use a special soldering iron with attachments. The second category includes fittings with a metal threaded connection. They can be collapsible or solid. The presented products provide a tight, durable joint.
Fittings without threads are used to connect two pieces of pipe. Heat welding allows you to make the joint as strong as the communications themselves. Threaded fittings are suitable for connecting pipes to a boiler, metal riser, meter, etc.
Currently, outdated steel pipelines are being replaced and new heating lines are being laid polymer pipes new generation. In the ranking of popular materials for heating installations, PPR pipes come first. This information article discusses in detail the technical characteristics of the material, the main advantages and disadvantages of polypropylene pipes for heating.
Polypropylene belongs to the group of synthetic thermoplastic polymers that change their properties under the influence of temperature. As a result of a complex chemical process using special metal-organic catalysts under the influence of medium and low pressure Polymerization of propylene occurs and its transformation into polypropylene. The resulting material is highly resistant to alkaline environments, as well as a high melting point, reaching 170 degrees. All these wonderful properties of polypropylene were used to create a new generation modern pipes made of polypropylene for heating and hot water supply lines.
Reasons to choose polypropylene pipes for the heating circuit
Carrying out home or intra-apartment wiring begins with consultations with heating system installers and shopping trips in search of suitable materials. Almost all experts unanimously advise choosing polypropylene pipes as the best material for a private home or replacement central heating multi-storey buildings.
The main reasons for choosing polypropylene pipes for heating are based on their technical characteristics :
- Ability to withstand high pressure. Heating pipes made of polypropylene with a coolant temperature of up to 70 degrees can withstand operating pressures from 4 to 6 atmospheres.
- High thermal stability. In a heated circuit made of PPR pipes, the maximum water temperature is 95 degrees.
- Thermal conductivity. Thanks to this property, the polypropylene pipeline is not covered with condensate droplets.
- Anti-corrosion resistance for heating. Polypropylene does not react with chemicals. The inner surface does not become clogged or overgrown with hard deposits.
- Large margin of safety. Under normal operating conditions, heating pipelines made of polypropylene can be used for up to 50 years.
A simple technology for assembling a heating circuit, combined with a complete set of connecting and docking fittings, brings polypropylene pipes to the top sales of popular polymer products.
Varieties
At the beginning of their history, PPR polypropylene pipes were unrivaled; they began to be used everywhere to replace heating circuits made of steel and cast iron. Short-term operation of a heating system made of such elements showed the material’s poor resistance to linear thermal deformation. To rid the heating wiring from such unpleasant defects, polypropylene pipes were improved with internal reinforcement or, as builders call it, “internal braiding”:
- Made of aluminum. Installation of aluminum-reinforced pipes is carried out with preliminary cleaning of the products so as not to damage the thin foil coating.
- Fiberglass. Unlike the first type, soldering of fiberglass pipelines is carried out without any special conditions.
Reinforcement of the inner part of the pipes from polypropylene made it possible to significantly reduce linear thermal deformations of the heating line.
Reinforced polypropylene pipes for heating systems
Despite the extensive line of polypropylene pipe products, not all types of polypropylene products can be used in heating systems and hot water supply. If you ask any specialist: “Which PP pipes are best for heating,” you can get a clear answer that reinforced products are best suited for laying heating systems. This statement is based on high degree coefficient of thermal expansion of products as a consequence of contact with a high temperature coolant. There are cases where, by mistake, hot water supply and heating lines were installed from ordinary polypropylene pipes and connecting fittings. Under the influence of the hot coolant, the laid heating branch was deformed and sagged. Horizontal wiring has lost all its attractiveness and turned into a wavy line.
Polypropylene pipes without reinforcement are suitable as a heating circuit for a “warm floor” heating system. In this case, the water temperature does not exceed comfortable temperature and besides, water pipe heating is firmly fixed concrete screed and is less subject to deformation tension.
Of the entire extensive family of polypropylene pipe products, only reinforced products are considered ideal material for laying heating and hot water networks.
Diameters of polypropylene pipes for heating
The main characteristic of products is the cross-sectional size - diameter, measured in mm. Heating home network consists of different sections, which for better effect are equipped with pipes of different diameters:
- from 100 to 200 mm are used for centralized supply of hot water to multi-storey buildings and public civil buildings.
- from 25 to 32 mm are used for connecting private houses and small buildings.
- Hot water is supplied through horizontal sections of distribution with a diameter of 20 mm, vertical risers are equipped with a diameter of 25 mm.
The presented table clearly shows the gradation of diameter changes depending on the amount of heat flow. 
Polypropylene fittings for heating
Polypropylene pipe products consist not only of individual linear elements, but also connecting or joining parts called fittings. They are necessary for interconnection, connection to vertical risers, radiators and water taps, and other various devices.
Types of heating fittings:
- Connecting couplings.
- Angled bends at 45 degrees or 90 degrees.
- Tees for connecting three sections.
- Plugs used in the dead-end part of the heating network or on the outer sections of heating radiators.
- Transitions from one diameter to another.
- Transitions from metal to plastic.
The exact number of fittings is determined after drawing up wiring diagram. A graphically designed plan for the location of the heating network with the exact dimensions of each section and indicating the heating radiators will help you select pipes of the required diameter and calculate the number of connecting fittings.
Leading manufacturers
The main task of any heating heating system is to create comfortable indoor conditions during the cold season.
The efficiency of heat transfer of heating devices depends on competent installation technology and high-quality pipe products.
It is difficult even for specialists to navigate the brands and trademarks of polypropylene products. To make the difficult choice of the right material a little easier and not make a mistake in the chosen product, we offer a top list of the best manufacturers of heating propylene pipes:
- The first place belongs to European brands. An example is the German brands Aquatherm. Wefatherm (Wefatherm). Rehau, whose products are distinguished by excellent quality and advanced manufacturing technology. The only drawback of this product is the high price.
- Czech manufacturers occupy second place. Many experts note the quality of EKOPLASTIK brand products. This company was the first to launch the production of polypropylene pipes reinforced with basalt fibers, capable of competing with the best German brands in terms of quality and lower price.
- Third place belongs to the well-known Turkish companies Tebo and Kalde, which produce products of average quality and at an affordable price. Heating systems assembled from pipes and fittings of these brands have an average service life of up to 50 years and, from a practical point of view, have no complaints.
The budget segment is represented by a line of the best Russian manufacturers PRO AQUA (Pro Aqua) and RVC, as well as the Chinese brand BLUE OCEAN. The companies have gained a good reputation and produce products of normal quality at an affordable price.
In order not to make a mistake in choosing polypropylene pipes and not to buy a fake of a well-known brand, you should carefully read the company logo on the official website and check the accuracy of the company name. You need to pay attention to the evenness and smoothness of the surface, and check in practice that the connecting fittings match the pipeline.
Heating systems, like any other, do not last forever. Sooner or later the time comes to repair the structure or even simply replace it with a new one. Considering that old systems have been in use for decades, a lot of time has passed since their installation and the owner who is planning to buy new parts may simply not be aware of all the variety modern options pipelines. Materials that have appeared relatively recently can significantly simplify installation and reduce the cost of the system as a whole. One such option is polypropylene pipes for heating.
Why is polypropylene better than other options?
Polypropylene is a thermoplastic. This means he is changing physical properties with temperature fluctuations environment. At 140°C it begins to soften, while at 175°C it already melts. Thus, the operating temperature of any polypropylene products should not exceed 120°C. Typically, pipes indicate a lower temperature, about 95°C, as the maximum permissible.
When purchasing polypropylene pipes, you must take into account that they are made from thermoplastic, that is, a material that slightly changes its properties when exposed to high temperatures.
The advantages of polypropylene pipes are obvious:
- The multilayer structure of the elements allows them to withstand fairly high temperatures.
- Simple installation procedure.
- Light weight, which simplifies transportation and installation of parts.
- Pipes do not need to be painted.
- Easy to maintain.
- Environmental Safety. When exposed to high temperatures, the material does not emit toxic substances.
- Low hydraulic resistance and complete absence of vibrations during the movement of coolant through the pipes.
- No mineral deposits form inside the parts.
- Resistance to mechanical and chemical influences.
- The pipe does not conduct stray currents.
- Low cost.
- Service life exceeds 50 years.
- Welding connections are stronger compared to others, which extends the service life of the system.
- High coefficient of thermal conductivity, therefore, heat loss in the system is minimal.
The coefficient of thermal expansion of polypropylene is quite high. According to calculations, a standard three-meter pipe with a temperature range from 20 to 90°C lengthens by three centimeters. This must be taken into account when designing the system. In addition, you need to know that at extremely low temperatures in the northern regions, the coolant in the heating system can heat up above the boiling point, which, in combination with high pressure, leads to pipe rupture.
Welding is the most reliable and popular way connections of polypropylene pipes, however, for this you need to choose a high-quality welding machine. The nuances that need to be taken into account when purchasing it are discussed in the following article:
Thus, for regions where extreme low temperatures, it is not recommended to use polypropylene for use in centralized heating systems. It is better to install parts made of stainless or galvanized steel. If, however, and the maximum temperature of the coolant is determined by the user, polypropylene can be installed, since there cannot be overheating of water in such systems.
If the rules for using polypropylene pipes are not followed, for example, if high temperature coolant or too high operating pressure in the system, parts may become deformed and destroyed. With proper use, they will last more than 50 years.
Classification of polypropylene pipes
The range of polypropylene pipes is represented by a large number of products. There are single-layer and multi-layer elements. Single-layer parts are classified:
- RRN. Least durable models. Recommended for use in feed systems cold water, industrial pipelines and ventilation systems.
- RRV. Made from blocksomer polymer. Used for the manufacture of impact high-strength connecting elements, as well as heating floor systems and cold water pipelines.
- PPR. Made from random copolymer polypropylene. Recommended for creating hot and cold water supply pipelines, as well as water heating systems, including floor-mounted varieties.
- P.P.S.. Made from highly flammable, highly durable polypropylene. It differs from other types of single-layer pipes in its higher maximum permissible temperature – 95°C.
Polypropylene pipes can be reinforced with aluminum, either solid or perforated sheet metal. Such products are characterized by greater tensile strength and a lower coefficient of thermal expansion.
Multilayer pipes are also called reinforced pipes. In addition to polypropylene, their composition also includes layers of various materials. Such products are divided into:
- Reinforced with perforated aluminum. Produced on the outer surface of the parts. Before welding, the aluminum must be cut off by 1 mm.
- Reinforced with a solid sheet of aluminum. The metal is also applied to the outer surface of the element. When connecting parts, the aluminum layer is removed at a distance of 1 mm.
- Reinforced with aluminum sheet. It is performed in the center of the product or closer to its inner part. Preliminary cleaning before welding of such pipes is not carried out.
- Fiberglass reinforced. The outer and inner parts of the part are made of polypropylene; in the middle of the product there is a layer of fiberglass.
- Composite reinforced. The composite used is a mixture of fiberglass and polypropylene. The composition is placed in the middle of the element between layers of polypropylene.
A clear advantage of reinforced products is a lower coefficient of thermal expansion, which allows them to elongate less when heated. Despite this, the parts during installation should not rest against walls or interior ceilings. If installation is planned in screed or plaster, be sure to leave free space for possible extension. You need to understand that reinforcement reduces the level of thermal expansion, but does not completely eliminate it. Therefore, in some cases it may be necessary to use special compensators.
Unlike pipes reinforced with aluminum, parts reinforced with glass fiber are devoid of layers of adhesive. Fiberglass is fused onto polypropylene, so these products do not delaminate during operation.
In general, the technical characteristics and cost of such parts differ slightly. Aluminum reinforced pipes require special preparation installation preparation, which involves stripping the metal layer. Whereas parts with fiberglass and composite can be welded immediately. The latter have another advantage: they do not delaminate during operation. This is due to the fact that such pipes do not have adhesive layers, and the reinforcing material is fused into polypropylene.
Selection criteria - what to look for?
When selecting polypropylene pipes for a heating system, you need to take into account several important parameters.
Criterion #1 - operating pressure
Shows the maximum long-term operating pressure at a temperature of 20°C for which the pipe is designed. It must be indicated on the product labeling after the letters PN. For example, if the letters are followed by the number 20, this means that the product can operate at a pressure of 20 atmospheres. For heating systems, it is advisable to choose parts designed for 25 atmospheres, although 20 is also acceptable.
Of course, in some cases the product will be able to withstand peak pressure values exceeding the maximum declared, but this is a short-term phenomenon. In addition, you need to remember that as the temperature of the coolant increases, the tensile strength of the pipe decreases. This must be taken into account when selecting parts for the system.
Criterion #2 - temperature
The product must indicate the maximum working temperature coolant. This can be done in the form of markings with a clearly stated value, for example, “90C”. Or there must be an indication that the part is intended for transporting hot liquid.
Polypropylene pipes for heating are supplied with markings, which necessarily indicate the maximum permissible operating pressure, coolant temperature, plastic composition, presence and type of reinforcing material, and other important information
Criterion #3 - reinforcement
It is very desirable because it reduces the coefficient of thermal expansion of parts and increases their tensile strength. How to determine which is better, fiberglass or aluminum reinforcement? Experts say that in general the parameters of the pipes are the same. It is worth paying attention to the manufacturer. If it is a well-known company, you can choose any option. If the product is from a manufacturer unknown to the buyer, then it is better to prefer fiberglass or composite. Such parts are more difficult to spoil; in any case, they will last a long time.
Criterion #4 - diameter
The diameter of the pipes for the heating system is selected in accordance with the values obtained as a result of hydrodynamic calculations. Their goal is to select parts with the smallest possible diameter for different sections of the heating system. In this case, the general heating scheme, operating pressure and coolant temperature must be taken into account. Central heating systems typically use 25mm diameter pipes, while autonomous systems this value may vary.
Fittings for polypropylene parts
Without properly selected fittings it is impossible to create polypropylene pipeline. They are responsible for the formation of turns, branches and turns of highways, and also connect various parts of the pipeline. Taken together, a single system of the required configuration is formed with extremely precise joining of all elements. It is important to consider that for polypropylene pipes, both conventional fittings, which are mounted using diffusion welding, and elements with a special brass threaded insert, designed to connect not only plastic parts, but also metal structures, can be used.
The range of polypropylene fittings is very wide. Moreover, they differ not only in size. There are two types of such elements:
- Parts without thread.
- Fittings with threaded connections. They can be collapsible or solid.
A specific type of fitting is selected in accordance with its operating conditions. For example, it is more convenient to attach hoses using one-piece fittings, and a meter or tank using threaded ones.
To install a heating system made of polypropylene pipes, fittings are required. They can be with or without threaded connections, intended for fastening by welding
Polypropylene pipes are an excellent replacement for traditional steel parts. They are not subject to corrosion, are easier to install, are durable, and do not accumulate scale. However, it is not recommended to use such elements in conditions where overheating of the coolant is possible. In addition, we should not forget about the fairly high coefficient of thermal expansion, as a result of which it may be necessary to use special expansion joints for pipes. With the right choice of polypropylene parts, they will last a very long time without any problems, delighting their owner with warmth and comfort in the home.